jbosscache-commits August 2009

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JBoss Cache SVN: r8147 - in core/trunk/src/main: java/org/jboss/cache and 1 other directory.

by jbosscache-commits＠lists.jboss.org

Author: manik.surtani(a)jboss.com Date: 2009-08-05 06:36:32 -0400 (Wed, 05 Aug 2009) New Revision: 8147 Modified: core/trunk/src/main/docbook/userguide/en/modules/eviction_policies.xml core/trunk/src/main/java/org/jboss/cache/Node.java Log: JBCACHE-1518 clarify docs and examples Modified: core/trunk/src/main/docbook/userguide/en/modules/eviction_policies.xml =================================================================== --- core/trunk/src/main/docbook/userguide/en/modules/eviction_policies.xml 2009-08-03 23:55:06 UTC (rev 8146) +++ core/trunk/src/main/docbook/userguide/en/modules/eviction_policies.xml 2009-08-05 10:36:32 UTC (rev 8147) @@ -138,9 +138,14 @@ <programlisting role="JAVA"><![CDATA[ ... Map lotsOfData = generateData(); - cache.put("/a/b/c", lotsOfData); - cache.getRoot().getChild("/a").setResident(true); - cache.getRoot().getChild("/a/b").setResident(true); + + Fqn abc = Fqn.fromString("/a/b/c"); + Fqn ab = abc.getParent(); + Fqn a = ab.getParent(); + + cache.put(abc, lotsOfData); + cache.getRoot().getChild(a).setResident(true); + cache.getRoot().getChild(ab).setResident(true); ... ]]></programlisting> <para> Modified: core/trunk/src/main/java/org/jboss/cache/Node.java =================================================================== --- core/trunk/src/main/java/org/jboss/cache/Node.java 2009-08-03 23:55:06 UTC (rev 8146) +++ core/trunk/src/main/java/org/jboss/cache/Node.java 2009-08-05 10:36:32 UTC (rev 8147) @@ -129,14 +129,18 @@ /** * Returns the child node * - * @param f {@link Fqn} of the child node + * @param f {@link Fqn} of the child node. This is a relative Fqn. * @return null if the child does not exist. */ Node<K, V> getChild(Fqn f); /** - * @param name name of the child - * @return a direct child of the current node. + * @param name name of the child. Note that passing in a String of "/a/b/c" will <b>not</b> return a node called 'c', + * 3 nodes deep. Instead it will try and look for a child called '/a/b/c' directly under this node. + * <p /> + * If you wish to retrieve a child more than one level deep, use the {@link #getChild(Fqn)} version of this method. + * <p /> + * @return a direct child of the current node, named by the name parameter. */ Node<K, V> getChild(Object name);

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Re: [jbosscache-commits] MS/Shopper [$800/week]

by Kennith Crosby

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Mission for our members

by Jeffrey Razybevu

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JBoss Cache SVN: r8146 - in enterprise-docs/tags: JBoss_EAP_5_0_0 and 9 other directories.

by jbosscache-commits＠lists.jboss.org

Author: irooskov(a)redhat.com Date: 2009-08-03 19:55:06 -0400 (Mon, 03 Aug 2009) New Revision: 8146 Added: enterprise-docs/tags/JBoss_EAP_5_0_0/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/Makefile enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Author_Group.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Book_Info.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.ent enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Revision_History.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/images/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/images/icon.svg enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/Makefile enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Author_Group.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Book_Info.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.ent enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Revision_History.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/images/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/images/icon.svg enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/Makefile enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Author_Group.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Book_Info.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/JBoss_Cache_User_Guide.ent enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Revision_History.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/architecture.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/basic_api.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/batching.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/cache_loaders.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/compatibility.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration_reference.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/deployment.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/eviction_policies.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/images/ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/images/icon.svg enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/introduction.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/jmx_reference.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/master.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/preface.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/replication.xml enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/transactions.xml Log: adding Cache EAP 5 books Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/Makefile =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/Makefile (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/Makefile 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,12 @@ +#Makefile for Red Hat Documentation +#Created by Jeff Fearn <jfearn(a)redhat.com> +#Copyright Red Hat Inc. 2006 + +XML_LANG = en-US + +BRAND = JBoss + +OTHER_LANGS = de-DE es-ES fr-FR ja-JP pt-BR zh-CN + +COMMON_CONFIG = /usr/share/publican +include $(COMMON_CONFIG)/make/Makefile.common Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Author_Group.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Author_Group.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Author_Group.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,10 @@ +<?xml version='1.0'?> +<!DOCTYPE authorgroup PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +]> + + +<authorgroup> + <author><firstname>Ben Wang, Bela Ban, Manik Surtani, Scott Marlow, Galder Zamarreño </firstname></author> + +</authorgroup> + Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Book_Info.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Book_Info.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Book_Info.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,30 @@ +<?xml version="1.0"?> +<!DOCTYPE bookinfo PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<bookinfo> + <title>JBoss Cache Frequently Asked Questions</title> + <subtitle>for Use with JBoss Enterprise Application Platform 5.0</subtitle> + <edition>2.0</edition> + <pubsnumber>1</pubsnumber> + <productname>JBoss Enterprise Application Platform</productname> + <productnumber>5.0</productnumber> + <abstract> + <para>This book is a compilation of frequently asked questions about JBoss Cache</para> + </abstract> + <isbn>N/A</isbn> + <corpauthor> + <inlinemediaobject> + <imageobject> + <imagedata fileref="Common_Content/images/redhat-logo.svg" /> + </imageobject> + </inlinemediaobject> + </corpauthor> + <copyright> + <year>&YEAR;</year> + <holder>&HOLDER;</holder> + </copyright> + <xi:include href="Common_Content/Legal_Notice.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> + +<xi:include href="Author_Group.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> + +</bookinfo> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.ent =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.ent (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.ent 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,3 @@ +<!ENTITY HOLDER "Red Hat, Inc"> +<!ENTITY YEAR "2009"> +<!ENTITY VERSION ""> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/JBoss_Cache_Frequently_Asked_Questions.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,1504 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "../../../../docbook-support/support/docbook-dtd/docbookx.dtd" + > +<book lang="en"> +<xi:include href="Book_Info.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> + + <chapter id="general"> + <title>General Information</title> + <qandaset> + + <qandaentry> + <question> + <para>What is JBoss Cache?</para> + </question> + + <answer> + <para>JBoss Cache is a replicated and transactional cache. It is + replicated since multiple JBoss Cache instances can be distributed + (either within the same JVM or across several JVMs whether they reside on + the same machine or on different machines on a network) and data is + replicated across the whole group. It is transactional because a + user can configure a + <ulink url="http://java.sun.com/products/jta/">JTA</ulink> + compliant transaction + manager and make any cache + interaction transactional, and caches would participate in ongoing JTA transactions. Note that + the cache can also be run without + any replication; this is the local mode. + </para> + + <para>JBoss Cache comes in two flavours: Core and POJO versions. The core library + (using the + <literal>org.jboss.cache.Cache</literal> + interface) is the underlying library that organises data in a tree-like structure and handles + all locking, + passivation, + eviction and replication characteristics of data in the cache. The POJO library (using the + <literal>org.jboss.cache.pojo.PojoCache</literal> + interface) is built atop the core library and allows introspection + of objects in the cache providing transparent coherence by using JBoss AOP. Note that the POJO + edition + of JBoss Cache + (often referred to as POJO Cache) comes with a separate set of documentation (Users' Guide, FAQ, + etc.) + available on the JBoss Cache + <ulink url="http://www.jboss.org/jbosscache/">documentation website</ulink>. + </para> + + <para> + JBoss Cache is made available in one of four different packages: + <itemizedlist> + <listitem> + <para> + <literal>jbosscache-core</literal> + </para> + contains the core Cache library for users who do not wish to use the additional + functionality + offered by POJO Cache. + </listitem> + <listitem> + <para> + <literal>jbosscache-pojo</literal> + </para> + contains the core Cache library as well as POJO Cache extensions and dependencies. + </listitem> + </itemizedlist> + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Who are the JBoss Cache developers?</para> + </question> + + <answer> + <para> + JBoss Cache has an active community of developers and contributors. The project was founded by + Bela + Ban + and is currently led by Manik Surtani. Jason Greene is the lead for the POJO Cache subsystem, + and other + contributors both past and present include Ben Wang, Harald Gliebe, Brian Stansberry, Vladimir + Blagojevic, Mircea Markus, Jimmy Wilson, Galder Zamarreño and Elias Ross. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>What about licensing?</para> + </question> + + <answer> + <para>JBoss Cache is licensed under + <ulink url="http://www.gnu.org/licenses/lgpl.html">LGPL</ulink>, an<ulink + url="http://www.opensource.org/">OSI</ulink>-approved open source license. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Where can I download JBoss Cache?</para> + </question> + + <answer> + <para>The JBoss Cache + <ulink url="http://www.jboss.com/products/jbosscache/downloads">product download page</ulink> + has prebuilt binaries as well as source distributions. You can also grab snapshots from the + JBoss.org subversion + repository. See + <ulink url="http://www.jboss.org/community/docs/DOC-10259">the JBoss Cache development</ulink> + wiki page for details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How do I build JBoss Cache from sources?</para> + </question> + + <answer> + <para> + Read the README-Maven.txt file in the source root. Note that you will need a JDK >= 5.0, and + Apache Maven >= 2.0.6. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Which versions of the JDK are supported by JBoss Cache?</para> + </question> + + <answer> + <para> + JBoss Cache is baselined on Java 5 and is tested on Java 5 and 6 VMs. If, for whatever reason + you have + to use Java 1.4, you could build a retroweaved version of the core cache + library that is Java 1.4 compatible, using the simple instructions on this wiki page + <ulink url="http://www.jboss.org/community/docs/DOC-10263">on building and running JBoss Cache + on Java 1.4. + </ulink>. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How do I know the version of JBoss Cache that I am using?</para> + </question> + + <answer> + <para> + <literal>java -jar jbosscache-core.jar</literal> + will spit out version details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I run JBoss Cache outside of JBoss Application + Server? + </para> + </question> + + <answer> + <para> + Absolutely! Even though JBoss Cache comes integrated with JBoss Application Server, + it can also be used in any other Java EE server such as BEA WebLogic, IBM Websphere or Tomcat. + It + can also run in a standalone Java process, completely outside of an application server. See the + Users' Guide for more + details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How can I migrate my application and configuration from using JBoss Cache 1.x to 2.x?</para> + </question> + <answer> + <para>Look at + <ulink url="http://www.jboss.org/community/docs/DOC-10246">this wiki page</ulink> + for help. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>What about from 2.x to 3.x?</para> + </question> + <answer> + <para> + JBoss Cache 3.x is API compatible with 2.x, although as far as possible you should refactor your + code + not to use deprecated methods as these may disappear in future releases of JBoss Cache. + </para> + <para> + JBoss Cache 3.x comes with an all new configuration format. Old 2.x configuration files will + still + work, although you will get a warning in the logs about this. Again, as far as possible, we + recommend + migrating your configuration file to the new format. Scripts are provided with the JBoss Cache + 3.x + distribution to migrate configuration files (see + <literal>config2to3.sh</literal> + and<literal>config2to3.bat</literal>). + </para> + <para> + Note that to take advantage of some of the new features in JBoss Cache 3.x, you need to be using + the + new configuration format. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Where can I report bugs or problems?</para> + </question> + + <answer> + <para>Please report any bugs or problems to + <ulink url="http://www.jboss.org/jbosscache">JBoss Cache User Forum</ulink>. + </para> + </answer> + </qandaentry> + </qandaset> + </chapter> + + <chapter id="TreeCache"> + <title>JBoss Cache - Core</title> + + <qandaset> + + <qandaentry> + <question> + <para>Using JBoss Cache 2 or 3 on JBoss AS 4.x</para> + </question> + + <answer> + <para> + JBoss AS 4.x ships with JBoss Cache 1.4.x. To make use of new features, performance improvements + and bug fixes in newer releases, you can follow some of the steps outlined on<ulink + url="http://www.jboss.org/community/docs/DOC-10254">this wiki page</ulink>. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I run multiple JBoss Cache instances on the same VM?</para> + </question> + + <answer> + <para>Yes. There are some scenarios where you may want to run + multiple instances of JBoss Cache. For example, you want to run + multiple local cache instances with each instance having its own + configuration (e.g., different cache policy). In this case, you will + need multiple xml configuration files. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can JBoss Cache run as a second level cache inside + Hibernate? + </para> + </question> + + <answer> + <para>Yes. Since Hibernate 3.0 release, you can configure it to use + JBoss Cache as a second level cache. For details, + see Hibernate documentation, and also see + <ulink url="http://www.jboss.org/community/docs/DOC-10265">this wiki page</ulink>. + </para> + <para> + JBoss Cache 3.x with MVCC in particular works very well as a Hibernate second level cache. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>What about using POJO Cache as a Hibernate cache?</para> + </question> + + <answer> + <para>It is not necessary to use POJO Cache for second level + cache inside Hibernate because Hibernate + manages fine-grained fields in Java objects. Using POJO Cache won't + provide any advantage, and will be an unnecessary performance drawback. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How can I configure JBoss Cache?</para> + </question> + + <answer> + <para>You can configure the JBoss Cache through a configuration xml + file or programmatically using a + <literal>org.jboss.cache.config.Configuration</literal> + object, passed in to the + <literal>org.jboss.cache.CacheFactory</literal> + instance. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I use a schema or DTD to validate my JBoss Cache configuration file? + </para> + </question> + + <answer> + <para> + As of JBoss Cache 3.x, yes. An XSD schema is provided in your jbosscache-core.jar file, and is + also + available online, on<ulink url="http://www.jboss.org/jbosscache/jbosscache-config-3.0.xsd"> + http://www.jboss.org/jbosscache/jbosscache-config-3.0.xsd</ulink>. + You can configure your IDE, text editor or XML authoring tool to use this schema to validate + your file. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>What is the difference between the different cache modes? + </para> + </question> + + <answer> + <para>JBossCache has five different cache modes, i.e., + <literal>LOCAL</literal> + , + <literal>REPL_SYNC</literal> + , + <literal>REPL_ASYNC</literal> + , + <literal>INVALIDATION_SYNC</literal> + and + <literal>INVALIDATION_ASYNC</literal> + . If you want to run JBoss Cache as a + single instance, then you should set the cache mode to + <literal>LOCAL</literal> + so that it won't attempt to replicate anything. + If you want to have synchronous replication among different + JBoss Cache instances, you set it to + <literal>REPL_SYNC</literal> + . + For asynchronous replication, use + <literal>AYSNC_REPL</literal> + . If you do not wish to replicate cached data but simply inform other caches in a cluster that + data + under + specific addresses are now stale and should be evicted from memory, use + <literal>INVALIDATION_SYNC</literal> + or + <literal>INVALIDTAION_ASYNC</literal> + . Synchronous and asynchronous behavior applies to invalidation as well as replication. + </para> + + <para>Note that + <literal>ASYNC_REPL</literal> + and + <literal>INVALIDATION_ASYNC</literal> + are non-blocking. This + can be useful when you want to have another JBoss Cache serving as a + mirror or backup and you don't want to wait for confirmation that this mirror has received your + messages. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How does JBoss Cache's replication mechanism work?</para> + </question> + + <answer> + <para>JBoss Cache leverages + <ulink url="http://www.jgroups.org">JGroups</ulink> + for network communications. A JGroups configuration section is present in your JBoss Cache + configuration. + </para> + <para> + A user + can configure the cluster of JBoss Cache instances by sharing the + same cluster name ( + <literal>cluster name</literal> + ). There is also + an option of whether to populate the cache data upon starting a new + instance in the + <literal>ClusterConfig</literal> + attribute. + </para> + + <para>Note that once all instances join the same replication group, + every replication change is propagated to all participating members. + There is no mechanism for sub-partitioning where some replication + can be done within only a subset of members, unless you use the Buddy Replication features. See + the + Users' Guide for more details on this. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>I run a 2 node cluster. If the network dies, do the caches continue to run?</para> + </question> + + <answer> + <para>Yes, both will continue to run, but depending on your replication mode, all transactions or + operations may not complete. If + <literal>REPL_SYNC</literal> + is used, operations will fail while if + <literal>REPL_ASYNC</literal> + is used they will succeed. Even if they succeed though, caches will be out of sync. + </para> + </answer> + </qandaentry> + + + <qandaentry> + <question> + <para>Can I plug in library X instead of JGroups to handle remote calls and group communications? + </para> + </question> + + <answer> + <para>At this stage the answer is no. We do have an abstraction layer between the + communication suite and JBoss Cache in the pipelines, and this may appear as a feature at some + stage + in + the future. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does the cache need to replicate to every other instance in the cluster? Isn't this slow if + the + cluster is large? + </para> + </question> + + <answer> + <para>Replication need not occur to every node in the cluster. This feature - + called Buddy Replication - + allows each node to pick one or more 'buddies' in the cluster and only replicate to its buddies. + This + allows a cluster to scale + very easily with no extra impact on memory or network traffic with each node added. + </para> + <para> + See the Users' Guide for more information on Buddy Replication, and how it can be used to + achieve very + high + scalability. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>I'm using Buddy Replication. Do I need to have some form of session affinity?</para> + </question> + <answer> + <para>Session affinity relates to returning to the same cache instance for the same data being used. + While this is strictly not a requirement for Buddy Replication, it is greatly recommended to + minimize + moving state around a cluster. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>If I have the need for different configuration properties (e.g., + <literal>CacheMode</literal> + and + <literal>IsolationLevel</literal> + ), do I simply need to create multiple + <literal>org.jboss.cache.Cache</literal> + instances with the appropriate configuration? + </para> + </question> + + <answer> + <para>Yes. All the above mentioned properties are per cache + instance. Therefore you will need separate + <literal>org.jboss.cache.Cache</literal> + instances. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Isn't this expensive from a networking standpoint, i.e., needing to create sockets for each + <literal>org.jboss.cache.Cache</literal> + instance? + </para> + </question> + + <answer> + <para> + Yes, it can be. For such cases it is recommended that you configure your cache using the JGroups + Multiplexer, which allows several caches to share + a single JGroups channel. Please see the Users' Guide for details on how to configure the + JGroups + Multiplexer. + </para> + <para> + A faster and more efficient approach is to use a shared transport in JGroups. Please see + <ulink url="http://www.jgroups.org">the JGroups documentation</ulink> + for more details on how to do this. + </para> + </answer> + </qandaentry> + + + <qandaentry> + <question> + <para>Does the + <literal>ClusterName</literal> + configuration element have + any relation to the JBoss AS cluster + <literal>PartitionName</literal> + ? + </para> + </question> + + <answer> + <para>Yes. They are both JGroups group names. Besides the notion of + a channel in JGroups, it also can partition the channel into different + group names. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>When using multiple JGroups based components + [cluster-service.xml, cache (multiple instances)], what is the + correct/valid way to configure those components to make sure my + multicast addresses don't conflict? + </para> + </question> + + <answer> + <para>There are two parameters to consider: multicast address (plus + port) and the group name. At minimum, you will have to run + components using a different group name. But whether to run them on + the same channel depends upon whether the communication performance + is critical for you or not. If it is, then it'd be best to run them + on different channels. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache support cache persistence + storage? + </para> + </question> + + <answer> + <para>Yes. JBoss Cache has a cache loader + interface that supports cache persistence. See below for more FAQs on cache loaders. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache support cache passivation/ overflow + to a data store? + </para> + </question> + + <answer> + <para>Yes. JBoss Cache uses the + cache loader to support cache passivation/ overflow. See + documentation on how to configure and use this feature. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Is JBoss Cache thread safe?</para> + </question> + + <answer> + <para>Yes, it is thread safe.</para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache support XA (2PC) transactions now?</para> + </question> + + <answer> + <para>No, although it is also on our to do list. Our internal + implementation does use a procedure similar to 2PC to coordinate a + transactions among different instances, but JBoss Cache is not an XA resource. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Which transaction managers are supported by + JBoss Cache? + </para> + </question> + + <answer> + <para>JBoss Cache supports any TransactionManager that is + <ulink url="http://java.sun.com/products/jta/">JTA</ulink> + compliant such as<ulink url="http://www.jboss.org/jbosstm/">JBoss Transactions</ulink>. + </para> + <para> + While JBoss Cache does ships with a + dummy transaction manager + (<literal>org.jboss.cache.transaction.DummyTransactionManager</literal>), we do + <emphasis>not</emphasis> + recommend using this for production. It is not thread safe, and is intended for internal testing + only. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How do I set up the cache to be transactional?</para> + </question> + + <answer> + <para>You either use the default transaction manager that ships with JBoss AS + or you have to implement the + <literal>org.jboss.cache.transaction.TransactionManagerLookup</literal> + interface, and return an + instance of your + <literal>javax.transaction.TransactionManager</literal> + implementation. The + configuration property + <literal>TransactionManagerLookupClass</literal> + defines the class + to be used by the cache to fetch a reference to a + transaction manager. It is trivial to implement this interface to support + other transaction managers. Once this attribute is specified, the + cache will look up the transaction context from this transaction + manager. + </para> + <para> + The + <literal>org.jboss.cache.transaction.GenericTransactionManagerLookup</literal> + class that ships + with JBoss Cache is able to detect and bind to most popular transaction managers. See the + <literal>GenericTransactionManagerLookup</literal> + javadocs for more information. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How do I control the cache locking level?</para> + </question> + + <answer> + <para>JBoss Cache lets you control the cache locking level through + the transaction isolation level. This is configured through the + attribute + <literal>IsolationLevel</literal> + . The transaction + isolation levels correspond to database + isolation levels, namely, + <literal>NONE</literal> + , + <literal>READ_UNCOMMITTED</literal> + , + <literal>READ_COMMITTED</literal> + , + <literal>REPEATABLE_READ</literal> + , and + <literal>SERIALIZABLE</literal> + . Note that these isolation levels are ignored if optimistic locking is used. For details, + please + refer + to the + user manual. + </para> + <para> + As of JBoss Cache 3.x, when using the MVCC locking scheme, only + <literal>READ_COMMITTED</literal> + and + <literal>REPEATABLE_READ</literal> + are supported. Any other isolation level provided will either be upgraded + or downgraded accordingly. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How does JBoss Cache lock data for concurrent access?</para> + </question> + + <answer> + <para>In JBoss Cache 2.x, by default pessimistic locking is used to lock data nodes, based on the + isolation level + configured. We also offer optimistic locking to allow for greater concurrency + at + the cost of slight processing overhead and performance. See the documentation for a more + detailed + discussion on concurrency and locking in JBoss Cache. + </para> + <para> + In JBoss Cache 3.x, optimistic and pessimistic locking are deprecated in favour of MVCC + (multi-version concurrency + control), which is far more efficient than either optimistic or pessimistic locking. For a + detailed discussion on + our MVCC implementation, see + <ulink url="http://jbosscache.blogspot.com/2008/07/mvcc-has-landed.html">this blog entry</ulink> + and<ulink url="http://www.jboss.org/community/docs/DOC-10272">this wiki page</ulink>. + </para> + </answer> + </qandaentry> + + + <qandaentry> + <question> + <para>How do I enable Optimistic Locking or MVCC in JBoss Cache?</para> + </question> + + <answer> + <para> + Please see the configuration section of the Users' Guide for details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I use the cache locking level even without a transaction + context? + </para> + </question> + + <answer> + <para>Yes. JBoss Cache controls the individual node locking behavior + through the isolation level semantics. This means even if you don't + use a transaction, you can specify the lock level via isolation + level. You can think of the node locking behavior outside of a + transaction as if it is under transaction with + <literal>auto_commit</literal> + on. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para> + Does JBoss Cache support + <literal>SELECT FOR UPDATE</literal> + semantics? + </para> + </question> + + <answer> + <para> + Yes, but this is is only possible if you are running within a JTA transaction + <emphasis>and</emphasis> + are using either + <literal>MVCC</literal> + or + <literal>PESSIMISTIC</literal> + as your node locking scheme. + </para> + <para> + To achieve + <literal>SELECT FOR UPDATE</literal> + semantics, simply do: + </para> + <programlisting role="JAVA"><![CDATA[ + + // start transaction ... + + cache.getInvocationContext().getOptionOverrides().setForceWriteLock(true); + Node n = cache.get("/a/b/c"); // this acquires a WRITE LOCK on this node + ... + ... + + // end transaction + + ]]></programlisting> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>With replication (REPL_SYNC/REPL_ASYNC) or invalidation + (INVALIDATION_SYNC/INVALIDATION_ASYNC), how + often does the cache broadcast messages over the network? + </para> + </question> + + <answer> + <para>If the updates are under transaction, then the broadcasts + happen only when the transaction is about to commit (actually + during the prepare stage internally). That is, it will be a batch + update. However, if the operations are not under transaction + context, then each update will trigger replication. Note that this + has performance implications if network latency is a problem. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How can I do a mass removal?</para> + </question> + + <answer> + <para>If you do a<literal>cache.removeNode("/myroot")</literal>, it will recursively remove + all the entries under "/myroot". + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I monitor and manage the JBoss Cache?</para> + </question> + + <answer> + <para>Yes, using a JMX console such as the one shipped with JBoss AS or Java 5's + <literal>jconsole</literal> + utility. See the chapter titled + <emphasis role="bold">Management Information</emphasis> + in the JBoss Cache Users' Guide for more details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para> + JBoss Cache uses a + <literal>:</literal> + character in its object name. This causes problems with + my MBean server. What can I do about it? + </para> + </question> + <answer> + <para> + This is something we have seen with some MBean servers. By default, JBoss Cache uses + <literal>jboss.cache:service=JBossCache</literal> + as a prefix to all objects it binds in JMX. + To work around this, use the + <literal>-Djbosscache.jmx.prefix</literal> + JVM parameter to pass in + an alternate prefix. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I disable JBoss Cache management attributes?</para> + </question> + + <answer> + <para>Yes, you can. See the section on configuration in the JBoss Cache Users' Guide. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>What happened to jboss-serialization.jar?</para> + </question> + + <answer> + <para> + As of JBoss Cache 2.0.0, the dependency on JBoss Serialization has been dropped since most of + the + benefits of JBoss Serialization are available in updated Java 5 VMs. Since JBoss Cache 2.0.0 is + baselined on Java 5, there was no need to provide these benefits separately. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache support partitioning?</para> + </question> + + <answer> + <para>Not right now. JBoss Cache does not support partitioning that a + user can configure to have different set of data residing on + different cache instances while still participating as a replication + group. + </para> + <para> + This is on the roadmap though, so do keep an eye on + <ulink url="http://jira.jboss.org/jira/browse/JBCACHE-60">JBCACHE-60</ulink> + if you are interested. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache handle the concept of application classloading + inside, say, a Java EE container? + </para> + </question> + + <answer> + <para>Application-specific classloading is used widely inside a Java EE + container. For example, a web application may require a new + classloader to scope a specific version of the user library. + However, by default JBoss Cache is agnostic to the classloader. In + general, this leads to two kinds of problems: + </para> + + <itemizedlist> + <listitem> + <para>Object instance is stored in cache1 and replicated to + cache2. As a result, the instance in cache2 is created by the + system classloader. The replication may fail if the system + classloader on cache2 does not have access to the required + class. Even if replication doesn't fail, a user thread in cache2 + may not be able to access the object if the user thread is + expecting a type defined by the application classloader. + </para> + </listitem> + + <listitem> + <para>Object instance is created by thread 1 and will be + accessed by thread 2 (with two different classloaders). + JBoss Cache has no notion of the different classloaders involved. + As a result, you will have a + <literal>ClassCastException</literal> + . This is a standard + problem in passing an object from one application space to + another; JBoss Cache just adds a level of indirection in passing + the object. + </para> + </listitem> + </itemizedlist> + + <para>To solve the first kind of issue JBoss Cache uses a + <literal>CacheMarshaller</literal> + . + Basically, this allows application code to register a classloader + with a portion of the cache tree for use in handling objects + replicated to that portion. See the + <literal>CacheMarshaller</literal> + section of + the Users' Guide for more details. + </para> + + <para>To solve the second kind of issue, you can use the the + <literal>UseLazyDeserialization</literal> + configuration + option in JBoss Cache, which wraps your objects in a + <literal>Marshalledvalue</literal> + wrapper. The + <literal>MarshalledValue</literal> + serializes and deserializes your object on demand, ensuring the proper thread local context + class loader is used each time. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache currently support pre-event and post-event + notification? + </para> + </question> + + <answer> + <para>Yes. A boolean is passed in to each notification callback identifying whether the callback is + before + or after the event. See the + <literal>org.jboss.cache.notifications.annotations.CacheListener</literal> + annotation for details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>How do I implement a custom listener to listen to + cache events? + </para> + </question> + + <answer> + <para> + See the Users' Guide on this subject. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I use + <literal>UseRegionBasedMarshalling</literal> + attribute in JBoss Cache in order to get + around ClassCastExceptions happening when accessing data in the cache that has just been + redeployed? + </para> + </question> + + <answer> + <para>Yes, you can. Originally, cache Marshalling was designed as a + workaround for those replicated caches that upon state transfer did not have access to the + classloaders defining the objects in the cache. + </para> + + <para>On each deployment, JBoss creates a new classloader per the top level deployment artifact, for + example an EAR. You also have to bear in mind that a class in an application server is defined + not + only by the class name but also its classloader. So, assuming that the cache is not deployed as + part + of your deployment, you could deploy an application and put instances of classes belonging to + this + deployment inside the cache. If you did a redeployment and try to do a get operation of the data + previously put, this would result on a ClassCastException. This is because even though the class + names + are the same, the class definitions are not. The current classloader is different to the one + when + the classes were originally put. + </para> + + <para>By enabling marshalling, you can control the lifecycle of the data in the cache and if on + undeployment, you deactivate the region and unregister the classloader that you'd have + registered on + deployment, you'd evict the data in the cache locally. That means that in the next deployment, + the + data won't be in the cache, therefore avoiding the problem. Obviously, using marshalling to get + around this problem is only recommended when you have some kind of persistence backing where the + data + survives, for example using CacheLoaders, or when JBoss Cache is used as a second level cache in + a + persistence framework. + </para> + + <para>To implement this feature, please follow the instructions indicated in the example located + in the CacheMarshaller section of the Users' Guide. It's worth noting that instead of a + <literal>ServletContextListener</literal> + , you could add this code into an + <literal>MBean</literal> + that contained lifecycle methods, such as + <literal>start()</literal> + and + <literal>stop()</literal> + . + The key would be for this MBean to depend on the target cache, so that it can operate as long as + the + cache is up and running. + </para> + </answer> + </qandaentry> + + </qandaset> + </chapter> + + <chapter id="eviction"> + <title>Eviction Policies</title> + <qandaset> + <qandaentry> + <question> + <para>Does JBoss Cache support eviction policies?</para> + </question> + + <answer> + <para>Yes. JBoss Cache currently supports multiple eviction policies such as LRU, MRU, and FIFO. + Users can also plug in their own eviction policy algorithms. See user + guide for details. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache's eviction policy operates in + replication mode? + </para> + </question> + + <answer> + <para>Yes and no. :-)</para> + + <para>The eviction policy only operates in local mode. That is, nodes are + only evicted locally. This may cause the cache contents not to be + synchronized temporarily. But when a user tries to obtain the cached + contents of an evicted node and finds out that is null (e.g., + <literal>get</literal> + returns null), it should get it from the + other data source and re-populate the data in the cache. During this + moment, the node content will be propagated and the cache content + will be in sync. + </para> + + <para>However, you still can run eviction policies with cache mode + set to either + <literal>REPL_SYNC</literal> + or + <literal>REPL_ASYNC</literal> + . Depending on your use case, you can + set multiple cache instances to have their own eviction policy + (which are applied locally) or just have selected instances with + eviction policies activated. + </para> + + <para>Also note that, with cache loader option, a locally evicted + node can also be persisted to the backend store and a user can + retrieve it from the store later on. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does JBoss Cache support + <literal>Region</literal> + ? + </para> + </question> + + <answer> + <para>Yes. JBoss Cache has the notion of region where a user can + configure the eviction policy parameters (e.g., + <literal>maxNodes</literal> + or + <literal>timeToIdleSeconds</literal> + ) + </para> + + <para>A region in JBoss Cache denotes a portion of tree hierarchy, + e.g., a fully qualified name ( + <literal>org.jboss.cache.Fqn</literal> + ). For example, + a user can define + <literal>/org/jboss</literal> + and + <literal>/org/foocom</literal> + as two separate regions. But note + that you can configure the region programmatically now, i.e., + everything has to be configured through the xml file. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>I have turned on the eviction policy, why do I still get "out + of memory" (OOM) exception? + </para> + </question> + + <answer> + <para>OOM can happen when the speed of cache access exceeds the + speed of eviction policy handling timer. Eviction policy handler + will wake up every + <literal>wakeUpInterval</literal> + milliseconds (or + <literal>wakeUpIntervalSeconds</literal> + seconds, prior to 3.x) + to process the eviction event queue. So when the queue size is full, it will create a + backlog and cause out-of-memory exceptions to happen unless the eviction timer catches + up. To address this problem, in addition to increase the VM heap + size, you can also reduce the + <literal>wakeUpInterval</literal> + so the timer thread + processes the queue more frequently. + </para> + </answer> + </qandaentry> + </qandaset> + </chapter> + <chapter id="cacheloaders"> + <title>Cache Loaders</title> + <qandaset> + + + <qandaentry> + <question> + <para>What is a cache loader?</para> + </question> + + <answer> + <para>A cache loader is the connection of JBoss Cache to a + (persistent) data store. The cache loader is called by JBoss Cache to + fetch data from a store when that data is not in the cache, and when + modifications are made to data in the cache the Cache Loader is + called to store those modifications back to the store. + </para> + + <para>In conjunction with eviction policies, JBoss Cache with a + cache loader allows a user to maintain a bounded cache for a large + backend datastore. Frequently used data is fetched from the + datastore into the cache, and the least used data is evicted, in + order to provide fast access to frequently accessed data. This is + all configured through XML, and the programmer doesn't have to take + care of loading and eviction. + </para> + + <para>JBoss Cache currently ships with several cache loader + implementations, including: + </para> + + <para> + <itemizedlist> + <listitem> + <para> + <literal>org.jboss.cache.loader.FileCacheLoader</literal> + : this implementation uses the file + system to store and retrieve data. JBoss Cache nodes are mapped + to directories, subnodes to subdirectories etc. Attributes of + a node are mapped to a data file + inside the + directory. + </para> + </listitem> + + <listitem> + <para> + <literal>org.jboss.cache.loader.jdbm.JdbmCacheLoader</literal> + : this implementation is based on<ulink url="http://jdbm.sourceforge.net/"> + JDBM</ulink>, + an open source file-based transactional persistence engine. + </para> + </listitem> + + <listitem> + <para> + <literal>org.jboss.cache.loader.bdbje.BdbjeCacheLoader</literal> + : this implementation is based on the + Oracle's Berkeley DB Java Edition database, a fast and efficient + transactional database. It uses a single file for the entire + store. Note that if you use the Berkeley DB cache loader with + JBoss Cache and wish to ship your product, you will have to acquire a + <ulink url="http://www.sleepycat.com/jeforjbosscache">commercial license from + Oracle</ulink>. + </para> + </listitem> + + <listitem> + <para> + <literal>org.jboss.cache.loader.JDBCCacheLoader</literal> + : this implementation uses the relational database as the persistent + storage. + </para> + </listitem> + + <listitem> + <para>And more. See the chapter on cache loaders in the Users' Guide for more details. + </para> + </listitem> + </itemizedlist> + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Is the FileCacheLoader recommended for production use?</para> + </question> + + <answer> + <para> + No, it is not. The FileCacheLoader has some severe limitations which restrict its use in a + production + environment, or if used in such an environment, it should be used with due care and sufficient + understanding of these limitations. + <itemizedlist> + <listitem>Due to the way the FileCacheLoader represents a tree structure on disk + (directories and + files) traversal is inefficient for deep trees. + </listitem> + <listitem>Usage on shared filesystems like NFS, Windows shares, etc. should be avoided as + these do + not implement proper file locking and can cause data corruption. + </listitem> + <listitem>Usage with an isolation level of NONE can cause corrupt writes as multiple threads + attempt to write to the same file. + </listitem> + <listitem>File systems are inherently not transactional, so when attempting to use your + cache in a + transactional context, failures when writing to the file (which happens during the + commit phase) + cannot be recovered. + </listitem> + </itemizedlist> + + As a rule of thumb, it is recommended that the FileCacheLoader not be used in a highly + concurrent, + transactional or stressful environment, and its use is restricted to testing. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can writing to cache loaders be asynchronous?</para> + </question> + + <answer> + <para>Yes. Set the + <literal>async</literal> + attrobute to true. See the JBoss Cache Users' Guide for a more + detailed discussion. By default though, all cache loader writes are + synchronous and will block. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I write my own cache loader ?</para> + </question> + + <answer> + <para>Yes. A cache loader is a class implementing + <literal>org.jboss.cache.loader.CacheLoader</literal> + or extending + <literal>org.jboss.cache.loader.AbstractCacheLoader</literal> + . It is + configured via the XML file (see JBoss Cache Users' Guide). + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Does a cache loader have to use a persistent store ?</para> + </question> + + <answer> + <para>No, a cache loader could for example fetch (and possibly store) + its data from a webdav-capable webserver. Another example is a + caching proxy server, which fetches contents from the web. Note that + an implementation of CacheLoader may not implement the 'store' + functionality in this case, but just the 'load' + functionality. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Do I have to pay to use Oracle's Berkeley DB CacheLoader?</para> + </question> + + <answer> + <para>Not if you use it only for personal use. As soon as you + distribute your product with BdbjeCacheLoader, you have to purchase + a commercial license from Oracle. See details at + <ulink + url="http://www.sleepycat.com/jeforjbosscache">http://www.sleepycat.com/jeforjbosscache + </ulink> + . + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Are there any tools available to monitor the Berkeley DB instance?</para> + </question> + + <answer> + <para> + Yes. Oracle ships a JMX-based monitoring tool, called + <ulink + url="http://www.oracle.com/technology/documentation/berkeley-db/je/java/com/sl..."> + JEMonitor + </ulink> + which can be downloaded from the Oracle website. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>When tuning my Berkeley DB instance, where should I put my je.properties file?</para> + </question> + + <answer> + <para> + <literal>je.properties</literal> + should reside in your Berkeley DB home directory. This is the directory you pass + in to the BDBJECacheLoader's + <literal>location</literal> + configuration property. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I use more than one cache loader?</para> + </question> + + <answer> + <para>Yes. Within the CacheLoaderConfiguration XML + element (see Users' Guide chapter on cache loaders) you can + describe several cache loaders. The impact is that the cache will + look at all of the cache loaders in the order they've been + configured, until it finds a valid, non-null element of data. When + performing writes, all cache loaders are written to (except if the + ignoreModifications element has been set to true for a specific + cache loader. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para>Can I migrate a JDBCacheLoader or FileCacheLoader based cache store containing data formatted + with + JBoss Cache 1.x.x to JBoss Cache 2.0 format? + </para> + </question> + + <answer> + <para>Yes. See "Transforming Cache Loaders" section within the "Cache Loaders" section located in + the + JBoss Cache Users' Guide. + </para> + </answer> + </qandaentry> + + <qandaentry> + <question> + <para> + Is the TCPDelegatingCacheLoader resilient to TCPCacheServer restarts? + </para> + </question> + + <answer> + <para> + As of JBoss Cache 2.1.0, the answer is yes. See the Users' Guide for details on how to configure + and + tune + your retries and wait period for reestablishing the TCP connection. + </para> + <para> + Prior to that, restarting the TCPCacheServer would also mean + restarting your application that uses the cache. + </para> + </answer> + </qandaentry> + + </qandaset> + </chapter> + <chapter id="troubleshooting"> + <title>Troubleshooting</title> + <qandaset> + + <qandaentry> + <question> + <para>I am having problems getting JBoss Cache to work, where can I get information on + troubleshooting? + </para> + </question> + <answer> + <para>Troubleshooting section can be found in the following + <ulink url="http://www.jboss.org/community/docs/DOC-10288">wiki link</ulink> + . + </para> + </answer> + </qandaentry> + </qandaset> + </chapter> +<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="Revision_History.xml"/> +</book> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_FAQ/en-US/Revision_History.xml 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zh-CN + +COMMON_CONFIG = /usr/share/publican +include $(COMMON_CONFIG)/make/Makefile.common + + + + Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Author_Group.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Author_Group.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Author_Group.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,8 @@ +<?xml version='1.0'?> +<!DOCTYPE authorgroup PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +]> + +<authorgroup> + <author><firstname>Manik Surtani, Galder Zamarreño</firstname></author> + +</authorgroup> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Book_Info.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Book_Info.xml (rev 0) +++ 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xmlns:xi="http://www.w3.org/2001/XInclude" /> + + <xi:include href="Author_Group.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> +</bookinfo> + Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.ent =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.ent (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.ent 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,3 @@ +<!ENTITY HOLDER "Red Hat, Inc"> +<!ENTITY YEAR "2009"> +<!ENTITY VERSION ""> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/JBoss_Cache_Tutorial.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,243 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> +<book id="JBossCache_Tutorial"> + <title>JBossCache Tutorial</title> + <xi:include href="Book_Info.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> + <chapter id="JBossCache_Tutorial-Introduction"> + <title>Introduction</title> + + <para> + JBoss Cache is an in-memory replicated, transactional, and fine-grained cache. + This tutorial focuses on the core Cache API. Please refer to the accompanying tutorial + for POJO Cache, if it is the POJO Cache API you are interested in. + </para> + <para> + For details of configuration, usage and APIs, please refer to the + <ulink url="http://labs.jboss.org/jbosscache/docs/index.html">user manuals</ulink>. + </para> + + <section> + <title>What You Will Learn</title> + + <itemizedlist> + <listitem> + <para>Cache creation and modification</para> + </listitem> + + <listitem> + <para>Replication of state</para> + </listitem> + + <listitem> + <para>Transactions</para> + </listitem> + </itemizedlist> + </section> +</chapter> + <chapter> + <title>Configuration</title> + + <para>First download the JBoss Cache 3.x distribution from + <ulink url="http://labs.jboss.org/jbosscache/download/index.html">the download page</ulink>. You will need the ALL distribution ( + <literal>jbosscache-core-3.X.Y.GA-all.zip</literal>). + Unzip it, and you will get a directory containing the distribution, such as + <literal>jbosscache-core-3.X.Y</literal> + . + For the sake of this tutorial, I will refer to this as + <literal>${JBOSSCACHE_HOME}</literal> + . + </para> + + <para>The configuration files are located in + <literal>${JBOSSCACHE_HOME}/etc</literal>. You can + modify the behavior of the cache by editing the various configuration files. + </para> + + <itemizedlist> + <listitem> + <para> + <literal>log4j.xml</literal> - Logging output. You can enable logging, specify log levels or + change the name and path to the log file. + </para> + </listitem> + + <listitem> + <para> + <literal>config-samples/total-replication.xml</literal> - Cache configuration file used for this tutorial. + </para> + </listitem> + </itemizedlist> + </chapter> + + <chapter> + <title>Script</title> + + <para>The only script needed for this tutorial is the + <literal>${JBOSSCACHE_HOME}/tutorial/build.xml</literal> + ant script. You also need to have + <ulink url="http://ant.apache.org/">Apache Ant</ulink> + installed for running the tutorial GUI. + </para> + </chapter> + + <chapter> + <title>Running The Tutorial GUI</title> + + <para> + The GUI is run by: + <itemizedlist> + <listitem>Changing to the + <literal>${JBOSSCACHE_HOME}/tutorial</literal> + directory (e.g.,<literal>cd ${JBOSSCACHE_HOME}/tutorial</literal>)</listitem> + <listitem>And then running the ant script (e.g.,<literal>ant run</literal>)</listitem> + </itemizedlist> + </para> + + <para> + This will cause a GUI window to appear, giving you a tree view of the cache in the top pane and a BeanShell + view of the JVM in the lower pane. + </para> + <para> + The BeanShell view is preset with the following variables: + <itemizedlist> + <listitem> + <literal>cache</literal> + - a reference to the <literal>org.jboss.cache.Cache</literal> interface, used by the GUI instance. + </listitem> + <listitem> + <literal>root</literal> + - a reference to the root <literal>org.jboss.cache.Node</literal> instance for the above cache. + </listitem> + <listitem> + <literal>transactionManager</literal> + - a reference to the registered <literal>javax.transaction.TransactionManager</literal> instance. + </listitem> + </itemizedlist> + The references made available to the BeanShell window point to the same cache instance used by the tree view in + the + GUI above. + </para> + + <para> + To run the GUI as a replicated tutorial, it is useful to start another command line window and run the ant script + again as you did above. Now you will have two cache instances running in two separate GUIs, replicating state + to each other. + </para> + + </chapter> + + <chapter> + <title>Tutorials</title> + Note that it is recommended that you shut down and restart the GUI for each of the following tutorials, to + ensure clean caches every time. + <section> + <title>Caches and Nodes</title> + <para> + For this tutorial, start a single instance of the GUI. In this tutorial, we will: + + <itemizedlist> + <listitem>Create nodes under the root node.</listitem> + <listitem>Remove nodes under the root node, both individually and recursively.</listitem> + <listitem>Add and remove data from nodes.</listitem> + </itemizedlist> + </para> + + <para>1. Set up the Fqns you need. In the BeanShell pane, create 3 Fqn variables:</para> + <programlisting role="JAVA"><![CDATA[ + childFqn1 = Fqn.fromString("/child1"); + childFqn2 = Fqn.fromString("/child2"); + childFqn3 = Fqn.fromString("/child2/child3"); + ]]></programlisting> + + <para>2. Create child nodes under the root node.</para> + <programlisting role="JAVA"><![CDATA[ + child1 = root.addChild(childFqn1); + child2 = root.addChild(childFqn2); + child3 = root.addChild(childFqn3); + ]]></programlisting> + + + <para>3. Query the nodes.</para> + <programlisting role="JAVA"><![CDATA[ + root.hasChild(childFqn1); // should return true + child2.hasChild(childFqn3.getLastElement()); // should return true + child3.getParent(); // should return child2 + child2.getParent(); // should return root + ]]></programlisting> + + <para>4. Put some data in the nodes. By selecting the nodes in the tree view, you should see the contents of + each node. + </para> + <programlisting role="JAVA"><![CDATA[ + child1.put("key1", "value1"); + child1.put("key2", "value2"); + child2.put("key3", "value3"); + child2.put("key4", "value4"); + child3.put("key5", "value5"); + child3.put("key6", "value6"); + ]]></programlisting> + + <para>5. Query some of the data.</para> + + <programlisting role="JAVA"><![CDATA[ + child1.getKeys(); + child2.getData(); + ]]></programlisting> + + <para>6. Remove some data in the nodes.</para> + + <programlisting role="JAVA"><![CDATA[ + child1.remove("key1"); + child2.remove("key3"); + child3.clearData(); + ]]></programlisting> + + <para>7. Delete nodes</para> + + <programlisting role="JAVA"><![CDATA[ + root.removeChild(childFqn1); // will also remove any data held under child1 + root.removeChild(childFqn2); // will recursively remove child3 as well. + ]]></programlisting> + + <para> + In addition to the above, you should refer to the + <literal>Cache</literal> + and + <literal>Node</literal> + <ulink url="http://labs.jboss.org/portal/jbosscache/docs/index.html">API docs</ulink> + and try out the APIs in the BeanShell script. + </para> + </section> + + <section> + <title>Replication</title> + <para> + For this tutorial, start two instances instance of the GUI. Repeat the exercises in the previous + tutorial, + only alternating between the two GUI windows when creating/removing nodes or adding/removing data. This + demonstrates + how the two cache instances in the two GUIs are kept in sync. + </para> + </section> + + <section> + <title>Transactions</title> + <para> + For this tutorial, start two instances instance of the GUI. Repeat the exercises in the previous + tutorial, + only starting transactions before creating/removing nodes or adding/removing data. This will depict how + replication only occurs on transaction boundaries. Try rolling back a few transactions as well, to see how + nothing gets replicated in these cases. + Below is the sample code for managing transactions: + </para> + <programlisting role="JAVA"><![CDATA[ + tm = cache.getTransactionManager(); + tm.begin(); + // do operations here + tm.commit(); // or tm.rollback(); + ]]></programlisting> + </section> + + </chapter> +<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="Revision_History.xml"/> +</book> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Revision_History.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Revision_History.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_Tutorial/en-US/Revision_History.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,26 @@ +<?xml version='1.0'?> +<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +]> + 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enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/Makefile =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/Makefile (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/Makefile 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,16 @@ +#Makefile for Red Hat Documentation +#Created by Jeff Fearn <jfearn(a)redhat.com> +#Copyright Red Hat Inc. 2006 + +XML_LANG = en-US + +BRAND = JBoss + +OTHER_LANGS = de-DE es-ES fr-FR ja-JP pt-BR zh-CN + +COMMON_CONFIG = /usr/share/publican +include $(COMMON_CONFIG)/make/Makefile.common + + + + Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Author_Group.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Author_Group.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Author_Group.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,8 @@ +<?xml version='1.0'?> +<!DOCTYPE authorgroup PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +]> + +<authorgroup> + <author><firstname>Manik Surtani, Galder Zamarreño</firstname></author> + +</authorgroup> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Book_Info.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Book_Info.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Book_Info.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,32 @@ +<?xml version='1.0'?> +<!DOCTYPE bookinfo PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd"> + +<bookinfo id="JBoss_Cache"> + <title>JBoss Cache Tutorial</title> + <subtitle>for Use with JBoss Enterprise Application Platform 5.0</subtitle> + <edition>2.0</edition> + <pubsnumber>1</pubsnumber> + <productname>JBoss Enterprise Application Platform</productname> + <productnumber>5.0</productnumber> + <abstract> + <para> + This book is a TreeCache and JBossCache Tutorial. + </para> + </abstract> + <isbn>N/A</isbn> + <corpauthor> + <inlinemediaobject> + <imageobject> + <imagedata fileref="Common_Content/images/redhat-logo.svg" /> + </imageobject> + </inlinemediaobject> + </corpauthor> + <copyright> + <year>&YEAR;</year> + <holder>&HOLDER;</holder> + </copyright> + <xi:include href="Common_Content/Legal_Notice.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> + + <xi:include href="Author_Group.xml" xmlns:xi="http://www.w3.org/2001/XInclude" /> +</bookinfo> + Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/JBoss_Cache_User_Guide.ent =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/JBoss_Cache_User_Guide.ent (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/JBoss_Cache_User_Guide.ent 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,3 @@ +<!ENTITY HOLDER "Red Hat, Inc"> +<!ENTITY YEAR "2009"> +<!ENTITY VERSION ""> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Revision_History.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Revision_History.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/Revision_History.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,26 @@ +<?xml version='1.0'?> +<!DOCTYPE appendix PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [ +]> + +<appendix id="appe-Publican-Revision_History"> + <title>Revision History</title> + <simpara> + <revhistory> + <revision> + <revnumber>1.0</revnumber> + <date></date> + <author> + <firstname></firstname> + <surname></surname> + <email></email> + </author> + <revdescription> + <simplelist> + <member></member> + </simplelist> + </revdescription> + </revision> + </revhistory> + </simpara> +</appendix> + Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/architecture.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/architecture.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/architecture.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,357 @@ +<chapter id="architecture"> + <title>Architecture</title> + <section id="architecture.tree_structure"> + <title>Data Structures Within The Cache</title> + + <para> + A <literal>Cache</literal> consists of a collection of <literal>Node</literal> instances, organised in a tree + structure. Each <literal>Node</literal> contains a <literal>Map</literal> which holds the data + objects to be cached. It is important to note that the structure is a mathematical tree, and not a graph; each + <literal>Node</literal> has one and only one parent, and the root node is denoted by the constant fully qualified + name, <literal>Fqn.ROOT</literal>. + </para> + <para> + <figure> + <title>Data structured as a tree</title> + <mediaobject> + <imageobject> + <imagedata fileref="TreeCacheArchitecture.png"/> + </imageobject> + </mediaobject> + </figure> + + In the diagram above, each box represents a JVM. You see 2 caches in separate JVMs, replicating data to each + other. + </para> + + <para> + Any modifications (see <link linkend="api">API chapter</link>) in one cache instance will be replicated to + the other cache. Naturally, you can have more than 2 caches in a cluster. + Depending on the transactional settings, this replication will occur either after each modification or at the + end of a transaction, at commit time. When a new cache is created, it can optionally acquire the contents + from one of the existing caches on startup. + </para> + </section> + + <section id="architecture.SPI_interfaces"> + <title>SPI Interfaces</title> + <para> + In addition to <literal>Cache</literal> and <literal>Node</literal> interfaces, JBoss Cache exposes more + powerful <literal>CacheSPI</literal> and <literal>NodeSPI</literal> interfaces, which offer more control over + the internals of JBoss Cache. These interfaces are not intended for general use, but are designed for people + who wish to extend and enhance JBoss Cache, or write custom <literal>Interceptor</literal> or + <literal>CacheLoader</literal> instances. + </para> + <figure> + <title>SPI Interfaces</title> + + <mediaobject> + <imageobject> + <imagedata fileref="SPI.png"/> + </imageobject> + </mediaobject> + </figure> + <para> + The <literal>CacheSPI</literal> interface cannot be created, but is injected into <literal>Interceptor</literal> + and <literal>CacheLoader</literal> implementations by the <literal>setCache(CacheSPI cache)</literal> + methods on these interfaces. <literal>CacheSPI</literal> extends <literal>Cache</literal> + so all the functionality of the basic API is also available. + </para> + <para> + Similarly, a <literal>NodeSPI</literal> interface cannot be created. Instead, one is obtained by performing + operations on <literal>CacheSPI</literal>, obtained as above. For example, <literal>Cache.getRoot() : Node</literal> + is overridden as <literal>CacheSPI.getRoot() : NodeSPI</literal>. + </para> + <para> + It is important to note that directly casting a <literal>Cache</literal> or <literal>Node</literal> + to its SPI counterpart is not recommended and is bad practice, since the inheritace of interfaces it is not a + contract that is guaranteed to be upheld moving forward. The exposed public APIs, on the other hand, is + guaranteed to be upheld. + </para> + </section> + + <section id="architecture.invocations"> + <title>Method Invocations On Nodes</title> + <para> + Since the cache is essentially a collection of nodes, aspects such as clustering, persistence, eviction, etc. + need to be applied to these nodes when operations are invoked on the cache as a whole or on individual nodes. + To achieve this in a clean, modular and extensible manner, an interceptor chain is used. The chain is built + up of a series of interceptors, each one adding an aspect or particular functionality. The chain is built + when the cache is created, based on the configuration used. + </para> + <para> + It is important to note that the <literal>NodeSPI</literal> offers some methods (such as the <literal>xxxDirect()</literal> + method family) that operate on a node directly without passing through the interceptor stack. Plugin authors + should note that using such methods will affect the aspects of the cache that may need to be applied, such as + locking, replication, etc. To put it simply, don't use such methods unless you <emphasis>really</emphasis> + know what you're doing! + </para> + + <section id="architecture.interceptors"> + <title>Interceptors</title> + <para> + JBoss Cache essentially is a core data structure - an implementation of <literal>DataContainer</literal> - and + aspects and features are implemented using interceptors in front of this data structure. A + <literal>CommandInterceptor</literal> is an abstract class, interceptor implementations extend this. + </para> + <para> + <literal>CommandInterceptor</literal> implements the <literal>Visitor</literal> interface so it is able to + alter commands in a strongly typed manner as the command makes its way to the data structure. More on + visitors and commands in the next section. + </para> + <para> + Interceptor implementations are chained together in the <literal>InterceptorChain</literal> class, which + dispatches a command across the chain of interceptors. A special interceptor, the <literal>CallInterceptor</literal>, + always sits at the end of this chain to invoke the command being passed up the chain by calling the + command's <literal>process()</literal> method. + </para> + <para> + JBoss Cache ships with several interceptors, representing different behavioral aspects, some of which + are: + <itemizedlist> + <listitem> + <literal>TxInterceptor</literal> + - looks for ongoing transactions and registers with transaction managers to participate in + synchronization events + </listitem> + <listitem> + <literal>ReplicationInterceptor</literal> + - replicates state across a cluster using the RpcManager class + </listitem> + <listitem> + <literal>CacheLoaderInterceptor</literal> + - loads data from a persistent store if the data requested is not available in memory + </listitem> + </itemizedlist> + The interceptor chain configured for your cache instance can be obtained and inspected by calling + <literal>CacheSPI.getInterceptorChain()</literal>, which returns an ordered <literal>List</literal> + of interceptors in the order in which they would be encountered by a command. + </para> + <section id="architecture.custom_interceptors"> + <title>Writing Custom Interceptors</title> + <para> + Custom interceptors to add specific aspects or features can be written by extending + <literal>CommandInterceptor</literal> and overriding the relevant + <literal>visitXXX()</literal> methods based on the commands you are interested in intercepting. There + are other abstract interceptors you could extend instead, such as the <literal>PrePostProcessingCommandInterceptor</literal> + and the <literal>SkipCheckChainedInterceptor</literal>. Please see their respective javadocs for details + on the extra features provided. + </para> + <para> + The custom interceptor will need to be added to the interceptor chain by using the + <literal>Cache.addInterceptor()</literal> methods. See the javadocs on these methods for details. + </para> + <para> + Adding custom interceptors via XML is also supported, please see the + <link linkend="configuration_reference_chapter">XML configuration reference</link> for details. + </para> + </section> + </section> + + <section id="architecture.commands"> + <title>Commands and Visitors</title> + <para> + Internally, JBoss Cache uses a command/visitor pattern to execute API calls. Whenever a method is called + on the cache interface, the <literal>CacheInvocationDelegate</literal>, which implements the <literal>Cache</literal> + interface, creates an instance of <literal>VisitableCommand</literal> and dispatches this command up a chain of + interceptors. Interceptors, which implement the <literal>Visitor</literal> interface, are able to handle + <literal>VisitableCommand</literal>s they are interested in, and add behavior to the command. + </para> + <para> + Each command contains all knowledge of the command being executed such as parameters used and processing + behavior, encapsulated in a <literal>process()</literal> method. For example, the <literal>RemoveNodeCommand</literal> + is created and passed up the interceptor chain when <literal>Cache.removeNode()</literal> is called, and + <literal>RemoveNodeCommand.process()</literal> has the necessary knowledge of how to remove a node from + the data structure. + </para> + <para> + In addition to being visitable, commands are also replicable. The JBoss Cache marshallers know how to + efficiently marshall commands and invoke them on remote cache instances using an internal RPC mechanism + based on JGroups. + </para> + </section> + + <section id="architecture.invocationcontext"> + <title>InvocationContexts</title> + <para> + <literal>InvocationContext</literal> + holds intermediate state for the duration of a single invocation, and is set up and + destroyed by the + <literal>InvocationContextInterceptor</literal> + which sits at the start of the interceptor chain. + </para> + <para> + <literal>InvocationContext</literal> + , as its name implies, holds contextual information associated with a single cache + method invocation. Contextual information includes associated + <literal>javax.transaction.Transaction</literal> + or + <literal>org.jboss.cache.transaction.GlobalTransaction</literal> + , + method invocation origin ( + <literal>InvocationContext.isOriginLocal()</literal> + ) as well as + <link + linkend="configuration.options"> + <literal>Option</literal> + overrides + </link>, and information around which nodes have been locked, etc. + </para> + <para> + The + <literal>InvocationContext</literal> + can be obtained by calling + <literal>Cache.getInvocationContext()</literal>. + </para> + </section> + </section> + + <section id="architecture.managers"> + <title>Managers For Subsystems</title> + <para> + Some aspects and functionality is shared by more than a single interceptor. Some of these have been + encapsulated + into managers, for use by various interceptors, and are made available by the + <literal>CacheSPI</literal> + interface. + </para> + + <section id="architecture.rpcmanager"> + <title>RpcManager</title> + <para> + This class is responsible for calls made via the JGroups channel for all RPC calls to remote caches, and + encapsulates the JGroups channel used. + </para> + </section> + + <section id="architecture.buddymanager"> + <title>BuddyManager</title> + <para> + This class manages buddy groups and invokes group organization remote calls to organize a cluster of + caches into smaller sub-groups. + </para> + </section> + + <section id="architecture.cacheloadermanager"> + <title>CacheLoaderManager</title> + <para> + Sets up and configures cache loaders. This class wraps individual + <literal>CacheLoader</literal> + instances + in delegating classes, such as + <literal>SingletonStoreCacheLoader</literal> + or + <literal>AsyncCacheLoader</literal> + , + or may add the + <literal>CacheLoader</literal> + to a chain using the + <literal>ChainingCacheLoader</literal> + . + </para> + </section> + + </section> + + <section id="architecture.marshalling"> + <title>Marshalling And Wire Formats</title> + <para> + Early versions of JBoss Cache simply wrote cached data to the network by writing to an + <literal>ObjectOutputStream</literal> + during replication. Over various releases in the JBoss Cache 1.x.x series this approach was gradually + deprecated + in favor of a more mature marshalling framework. In the JBoss Cache 2.x.x series, this is the only officially + supported and recommended mechanism for writing objects to datastreams. + </para> + <figure> + <title>The Marshaller interface</title> + + <mediaobject> + <imageobject> + <imagedata fileref="Marshaller.png"/> + </imageobject> + </mediaobject> + </figure> + <section> + <title>The Marshaller Interface</title> + <para> + The + <literal>Marshaller</literal> + interface extends + <literal>RpcDispatcher.Marshaller</literal> + from JGroups. + This interface has two main implementations - a delegating + <literal>VersionAwareMarshaller</literal> + and a + concrete + <literal>CacheMarshaller300</literal> + . + </para> + <para> + The marshaller can be obtained by calling + <literal>CacheSPI.getMarshaller()</literal>, and defaults to the + <literal>VersionAwareMarshaller</literal>. + Users may also write their own marshallers by implementing the + <literal>Marshaller</literal> + interface or extending the <literal>AbstractMarshaller</literal> class, and adding it to their configuration + by using the <literal>Configuration.setMarshallerClass()</literal> setter. + </para> + </section> + + <section> + <title>VersionAwareMarshaller</title> + <para> + As the name suggests, this marshaller adds a version + <literal>short</literal> + to the start of any stream when + writing, enabling similar + <literal>VersionAwareMarshaller</literal> + instances to read the version short and + know which specific marshaller implementation to delegate the call to. + For example, + <literal>CacheMarshaller200</literal> + is the marshaller for JBoss Cache 2.0.x. + JBoss Cache 3.0.x ships with + <literal>CacheMarshaller300</literal> + with an improved wire protocol. Using a + <literal>VersionAwareMarshaller</literal> + helps achieve wire protocol compatibility between minor + releases but still affords us the flexibility to tweak and improve the wire protocol between minor or micro + releases. + </para> + </section> + </section> + <section id="architecture.regions"> + <title>Class Loading and Regions</title> + <para> + When used to cluster state of application servers, applications deployed in the application tend to put + instances + of objects specific to their application in the cache (or in an + <literal>HttpSession</literal> + object) which + would require replication. It is common for application servers to assign separate + <literal>ClassLoader</literal> + instances to each application deployed, but have JBoss Cache libraries referenced by the application server's + <literal>ClassLoader</literal>. + </para> + <para> + To enable us to successfully marshall and unmarshall objects from such class loaders, we use a concept called + regions. A region is a portion of the cache which share a common class loader (a region also has other uses - + see <link linkend="eviction_policies">eviction policies</link>). + </para> + <para> + A region is created by using the + <literal>Cache.getRegion(Fqn fqn, boolean createIfNotExists)</literal> + method, + and returns an implementation of the + <literal>Region</literal> + interface. Once a region is obtained, a + class loader for the region can be set or unset, and the region can be activated/deactivated. By default, + regions + are active unless the + <literal>InactiveOnStartup</literal> + configuration attribute is set to + <literal>true</literal>. + </para> + </section> +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/basic_api.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/basic_api.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/basic_api.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,651 @@ +<chapter id="api"> + <title>User API</title> + <section> + <title>API Classes</title> + <para> + The <literal>Cache</literal> interface is the primary mechanism for interacting with JBoss Cache. It is + constructed and optionally started using the <literal>CacheFactory</literal>. The <literal>CacheFactory</literal> + allows you to create a <literal>Cache</literal> either from a <literal>Configuration</literal> object or an XML + file. The cache organizes data into a tree structure, made up of nodes. Once you have a reference to a + <literal>Cache</literal>, you can use it to look up <literal>Node</literal> objects in the tree structure, + and store data in the tree. + <mediaobject> + <imageobject> + <imagedata fileref="PublicAPI.png" format="PNG"/> + </imageobject> + </mediaobject> + + </para> + + <para> + Note that the diagram above only depicts some of the more popular API methods. Reviewing the javadoc for the + above interfaces is the best way to learn the API. Below, we cover some of the main points. + </para> + </section> + + <section id="api.create_start"> + <title>Instantiating and Starting the Cache</title> + <para> + An instance of the <literal>Cache</literal> interface can only be created via a <literal>CacheFactory</literal>. + This is unlike JBoss Cache 1.x, where an instance of the old <literal>TreeCache</literal> class could be directly + instantiated. + </para> + <para> + The <literal>CacheFactory</literal> provides a number of overloaded methods for creating a <literal>Cache</literal>, + but they all fundamentally do the same thing: + <itemizedlist> + <listitem> + Gain access to a <literal>Configuration</literal>, either by having one passed in as a method + parameter or by parsing XML content and constructing one. The XML content can come from a provided input + stream, from a classpath or filesystem location. See the <link linkend="configuration">chapter on Configuration</link> + for more on obtaining a <literal>Configuration</literal>. + </listitem> + <listitem> + Instantiate the <literal>Cache</literal> and provide it with a reference to the <literal>Configuration</literal>. + </listitem> + <listitem> + Optionally invoke the cache's <literal>create()</literal> and <literal>start()</literal> methods. + </listitem> + </itemizedlist> + </para> + + <para> + Here is an example of the simplest mechanism for creating and starting a cache, using the default + configuration values: + </para> + + <programlisting role="JAVA"><![CDATA[ + CacheFactory factory = new DefaultCacheFactory(); + Cache cache = factory.createCache(); + ]]></programlisting> + + <para> + In this example, we tell the <literal>CacheFactory</literal> to find and parse a configuration file on + the classpath: + </para> + + <programlisting role="JAVA"><![CDATA[ + CacheFactory factory = new DefaultCacheFactory(); + Cache cache = factory.createCache("cache-configuration.xml"); + ]]></programlisting> + + <para>In this example, we configure the cache from a file, but want to programatically + change a configuration element. So, we tell the factory not to start the cache, and instead do it ourselves: + </para> + + <programlisting role="JAVA"><![CDATA[ + CacheFactory factory = new DefaultCacheFactory(); + Cache cache = factory.createCache("/opt/configurations/cache-configuration.xml", false); + Configuration config = cache.getConfiguration(); + config.setClusterName(this.getClusterName()); + + // Have to create and start cache before using it + cache.create(); + cache.start(); + ]]></programlisting> + + </section> + + <section> + <title>Caching and Retrieving Data</title> + + <para> + Next, lets use the <literal>Cache</literal> API to access a <literal>Node</literal> in the cache and then + do some simple reads and writes to that node. + </para> + <programlisting role="JAVA"><![CDATA[ + // Let's get a hold of the root node. + Node rootNode = cache.getRoot(); + + // Remember, JBoss Cache stores data in a tree structure. + // All nodes in the tree structure are identified by Fqn objects. + Fqn peterGriffinFqn = Fqn.fromString("/griffin/peter"); + + // Create a new Node + Node peterGriffin = rootNode.addChild(peterGriffinFqn); + + // let's store some data in the node + peterGriffin.put("isCartoonCharacter", Boolean.TRUE); + peterGriffin.put("favoriteDrink", new Beer()); + + // some tests (just assume this code is in a JUnit test case) + assertTrue(peterGriffin.get("isCartoonCharacter")); + assertEquals(peterGriffinFqn, peterGriffin.getFqn()); + assertTrue(rootNode.hasChild(peterGriffinFqn)); + + Set keys = new HashSet(); + keys.add("isCartoonCharacter"); + keys.add("favoriteDrink"); + + assertEquals(keys, peterGriffin.getKeys()); + + // let's remove some data from the node + peterGriffin.remove("favoriteDrink"); + + assertNull(peterGriffin.get("favoriteDrink"); + + // let's remove the node altogether + rootNode.removeChild(peterGriffinFqn); + + assertFalse(rootNode.hasChild(peterGriffinFqn)); + ]]></programlisting> + + <para> + The <literal>Cache</literal> interface also exposes put/get/remove operations that take an + <link linkend="basic_api.fqn">Fqn</link> as an argument, for convenience: + </para> + + <programlisting role="JAVA"><![CDATA[ + Fqn peterGriffinFqn = Fqn.fromString("/griffin/peter"); + + cache.put(peterGriffinFqn, "isCartoonCharacter", Boolean.TRUE); + cache.put(peterGriffinFqn, "favoriteDrink", new Beer()); + + assertTrue(peterGriffin.get(peterGriffinFqn, "isCartoonCharacter")); + assertTrue(cache.getRootNode().hasChild(peterGriffinFqn)); + + cache.remove(peterGriffinFqn, "favoriteDrink"); + + assertNull(cache.get(peterGriffinFqn, "favoriteDrink"); + + cache.removeNode(peterGriffinFqn); + + assertFalse(cache.getRootNode().hasChild(peterGriffinFqn)); + ]]></programlisting> + <section> + <title>Organizing Your Data and Using the Node Structure</title> + <para> + A Node should be viewed as a named logical grouping of data. A node should be used to contain data for a + single data record, for example information about a particular person or account. It should be kept in + mind that all aspects of the cache - locking, cache loading, replication and eviction - happen on a per-node + basis. As such, anything grouped together by being stored in a single node will be treated as a single + atomic unit. + </para> + </section> + </section> + + <section id="basic_api.fqn"> + <title> + The <literal>Fqn</literal> Class + </title> + + <para> + The previous section used the <literal>Fqn</literal> class in its examples; now let's learn a bit more about + that class. + </para> + + <para> + A Fully Qualified Name (Fqn) encapsulates a list of names which represent a path to a particular location in + the cache's tree structure. The elements in the list are typically <literal>String</literal>s but can be + any <literal>Object</literal> or a mix of different types. + </para> + + <para> + This path can be absolute (i.e., relative to the root node), or relative to any node in the cache. Reading the + documentation on each API call that makes use of <literal>Fqn</literal> will tell you whether the API expects + a relative or absolute <literal>Fqn</literal>. + </para> + + <para> + The <literal>Fqn</literal> class provides are variety of factory methods; see the javadoc for all the + possibilities. The following illustrates the most commonly used approaches to creating an Fqn: + </para> + + <programlisting role="JAVA"><![CDATA[ + // Create an Fqn pointing to node 'Joe' under parent node 'Smith' + // under the 'people' section of the tree + + // Parse it from a String + Fqn abc = Fqn.fromString("/people/Smith/Joe/"); + + // Here we want to use types other than String + Fqn acctFqn = Fqn.fromElements("accounts", "NY", new Integer(12345)); + ]]></programlisting> + + <para>Note that</para> + <programlisting role="JAVA"><![CDATA[Fqn f = Fqn.fromElements("a", "b", "c");]]></programlisting> + <para>is the same as + </para> + <programlisting role="JAVA"><![CDATA[Fqn f = Fqn.fromString("/a/b/c");]]></programlisting> + + </section> + + <section> + <title>Stopping and Destroying the Cache</title> + <para> + It is good practice to stop and destroy your cache when you are done + using it, particularly if it is a clustered cache and has thus + used a JGroups channel. Stopping and destroying a cache ensures + resources like network sockets and maintenance threads are properly cleaned up. + </para> + + <programlisting role="JAVA"><![CDATA[ + cache.stop(); + cache.destroy(); + ]]></programlisting> + + <para> + Not also that a cache that has had + <literal>stop()</literal> + invoked + on it can be started again with a new call to + <literal>start()</literal> + . + Similarly, a cache that has had + <literal>destroy()</literal> + invoked + on it can be created again with a new call to + <literal>create()</literal> + (and then started again with a + <literal>start()</literal> + call). + </para> + </section> + + <section> + <title>Cache Modes</title> + <para> + Although technically not part of the API, the <emphasis>mode</emphasis> in which the cache is configured to + operate affects the cluster-wide behavior of any <literal>put</literal> or <literal>remove</literal> + operation, so we'll briefly mention the various modes here. + </para> + <para> + JBoss Cache modes are denoted by the <literal>org.jboss.cache.config.Configuration.CacheMode</literal> + enumeration. They consist of: + <itemizedlist> + <listitem> + <emphasis>LOCAL</emphasis> + - local, non-clustered cache. Local caches don't join a cluster and don't + communicate with other caches in a cluster. + </listitem> + <listitem> + <emphasis>REPL_SYNC</emphasis> + - synchronous replication. Replicated caches replicate all changes to the other + caches in the cluster. Synchronous replication means that changes are replicated and the caller blocks + until replication acknowledgements are received. + </listitem> + <listitem> + <emphasis>REPL_ASYNC</emphasis> + - asynchronous replication. Similar to REPL_SYNC above, replicated caches replicate + all changes to the other caches in the cluster. Being asynchronous, the caller does not block until + replication acknowledgements are received. + </listitem> + <listitem> + <emphasis>INVALIDATION_SYNC</emphasis> + - if a cache is configured for invalidation rather than replication, + every time data is changed in a cache other caches in the cluster + receive a message informing them that their data is now stale and should + be evicted from memory. This reduces replication overhead while still being able to invalidate stale data + on remote caches. + </listitem> + <listitem> + <emphasis>INVALIDATION_ASYNC</emphasis> + - as above, except this invalidation mode causes invalidation messages + to be broadcast asynchronously. + </listitem> + </itemizedlist> + </para> + <para> + See the <link linkend="clustering">chapter on Clustering</link> for more details on how cache mode + affects behavior. See the <link linkend="configuration">chapter on Configuration</link> for info on how to + configure things like cache mode. + </para> + </section> + + <section id="api.listener"> + <title> + Adding a Cache Listener - registering for cache events + </title> + <para> + JBoss Cache provides a convenient mechanism for registering notifications on cache events. + </para> + <programlisting role="JAVA"><![CDATA[ + Object myListener = new MyCacheListener(); + cache.addCacheListener(myListener); + ]]></programlisting> + <para> + Similar methods exist for removing or querying registered listeners. See the javadocs on the + <literal>Cache</literal> interface for more details. + </para> + <para> + Basically any public class can be used as a listener, provided it is annotated with the + <literal>@CacheListener</literal> annotation. In addition, the class needs to have one or + more methods annotated with one of the method-level annotations (in the + <literal>org.jboss.cache.notifications.annotation</literal> + package). Methods annotated as such need to be public, have a void return type, and accept a single parameter + of + type + <literal>org.jboss.cache.notifications.event.Event</literal> + or one of its subtypes. + + <itemizedlist> + <listitem> + <para> + <literal>@CacheStarted</literal> + - methods annotated such receive a notification when the cache is + started. Methods need to accept a parameter type which is assignable from + <literal>CacheStartedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@CacheStopped</literal> + - methods annotated such receive a notification when the cache is + stopped. Methods need to accept a parameter type which is assignable from + <literal>CacheStoppedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeCreated</literal> + - methods annotated such receive a notification when a node is + created. Methods need to accept a parameter type which is assignable from + <literal>NodeCreatedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeRemoved</literal> + - methods annotated such receive a notification when a node is + removed. Methods need to accept a parameter type which is assignable from + <literal>NodeRemovedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeModified</literal> + - methods annotated such receive a notification when a node is + modified. Methods need to accept a parameter type which is assignable from + <literal>NodeModifiedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeMoved</literal> + - methods annotated such receive a notification when a node is + moved. Methods need to accept a parameter type which is assignable from + <literal>NodeMovedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeVisited</literal> + - methods annotated such receive a notification when a node is + started. Methods need to accept a parameter type which is assignable from + <literal>NodeVisitedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeLoaded</literal> + - methods annotated such receive a notification when a node is + loaded from a + <literal>CacheLoader</literal> + . Methods need to accept a parameter type which is assignable from + <literal>NodeLoadedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeEvicted</literal> + - methods annotated such receive a notification when a node is + evicted from memory. Methods need to accept a parameter type which is assignable from + <literal>NodeEvictedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeInvalidated</literal> + - methods annotated such receive a notification when a node is + evicted from memory due to a remote invalidation event. Methods need to accept a parameter type which is assignable from + <literal>NodeInvalidatedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodeActivated</literal> + - methods annotated such receive a notification when a node is + activated. Methods need to accept a parameter type which is assignable from + <literal>NodeActivatedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@NodePassivated</literal> + - methods annotated such receive a notification when a node is + passivated. Methods need to accept a parameter type which is assignable from + <literal>NodePassivatedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@TransactionRegistered</literal> + - methods annotated such receive a notification when the cache + registers a + <literal>javax.transaction.Synchronization</literal> + with a registered transaction manager. + Methods need to accept a parameter type which is assignable from + <literal>TransactionRegisteredEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@TransactionCompleted</literal> + - methods annotated such receive a notification when the cache + receives a commit or rollback call from a registered transaction manager. + Methods need to accept a parameter type which is assignable from + <literal>TransactionCompletedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@ViewChanged</literal> + - methods annotated such receive a notification when the group structure + of the cluster changes. Methods need to accept a parameter type which is assignable from + <literal>ViewChangedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@CacheBlocked</literal> + - methods annotated such receive a notification when the cluster + requests that cache operations are blocked for a state transfer event. Methods need to accept a + parameter type which is assignable from + <literal>CacheBlockedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@CacheUnblocked</literal> + - methods annotated such receive a notification when the cluster + requests that cache operations are unblocked after a state transfer event. Methods need to accept a + parameter type which is assignable from + <literal>CacheUnblockedEvent</literal> + . + </para> + </listitem> + + <listitem> + <para> + <literal>@BuddyGroupChanged</literal> + - methods annotated such receive a notification when a node changes its buddy group, perhaps due + to a buddy falling out of the cluster or a newer, closer buddy joining. + Methods need to accept a parameter type which is assignable from <literal>BuddyGroupChangedEvent</literal>. + </para> + </listitem> + </itemizedlist> + </para> + <para> + Refer to the javadocs on the annotations as well as the + <literal>Event</literal> subtypes for details of what is passed in to your method, and when. + </para> + <para> + Example: + </para> + <programlisting role="JAVA"><![CDATA[ + @CacheListener + public class MyListener + { + + @CacheStarted + @CacheStopped + public void cacheStartStopEvent(Event e) + { + switch (e.getType()) + { + case CACHE_STARTED: + System.out.println("Cache has started"); + break; + case CACHE_STOPPED: + System.out.println("Cache has stopped"); + break; + } + } + + @NodeCreated + @NodeRemoved + @NodeVisited + @NodeModified + @NodeMoved + public void logNodeEvent(NodeEvent ne) + { + log("An event on node " + ne.getFqn() + " has occured"); + } + } + ]]></programlisting> + <section> + <title>Synchronous and Asynchronous Notifications</title> + <para> + By default, all notifications are synchronous, in that they happen on the thread of the caller which generated + the event. As such, it is good practise to ensure cache listener implementations don't hold up the thread in + long-running tasks. Alternatively, you could set the <literal>CacheListener.sync()</literal> attribute to + <literal>false</literal>, in which case you will not be notified in the caller's thread. See the + <link linkend="element.listeners">configuration reference</link> on tuning this thread pool and size of blocking + queue. + </para> + </section> + </section> + + <section> + <title>Using Cache Loaders</title> + <para> + Cache loaders are an important part of JBoss Cache. They allow persistence of nodes to disk or to remote cache + clusters, and allow for passivation when caches run out of memory. In addition, cache loaders allow JBoss Cache + to perform 'warm starts', where in-memory state can be preloaded from persistent storage. JBoss Cache ships + with a number of cache loader implementations. + <itemizedlist> + <listitem> + <literal>org.jboss.cache.loader.FileCacheLoader</literal> + - a basic, filesystem based cache loader that persists data to disk. Non-transactional and not very + performant, but a very simple solution. Used mainly for testing and not recommended for production use. + </listitem> + <listitem> + <literal>org.jboss.cache.loader.JDBCCacheLoader</literal> + - uses a JDBC connection to store data. Connections could be created and maintained in an internal pool + (uses the c3p0 pooling library) + or from a configured DataSource. The database this CacheLoader connects to could be local or remotely + located. + </listitem> + <listitem> + <literal>org.jboss.cache.loader.BdbjeCacheLoader</literal> + - uses Oracle's BerkeleyDB file-based transactional database to persist data. Transactional and very + performant, but potentially restrictive license. + </listitem> + <listitem> + <literal>org.jboss.cache.loader.JdbmCacheLoader</literal> + - an open source alternative to the BerkeleyDB. + </listitem> + <listitem> + <literal>org.jboss.cache.loader.tcp.TcpCacheLoader</literal> + - uses a TCP socket to "persist" data to a remote cluster, using <ulink url="http://www.jboss.org/community/docs/DOC-10292">a "far cache" pattern</ulink>. + </listitem> + <listitem> + <literal>org.jboss.cache.loader.ClusteredCacheLoader</literal> + - used as a "read-only" cache loader, where other nodes in the cluster are queried for state. Useful when full + state transfer is too expensive and it is preferred that state is lazily loaded. + </listitem> + </itemizedlist> + These cache loaders, along with advanced aspects and tuning issues, are discussed in the + <link linkend="cache_loaders">chapter dedicated to cache loaders</link>. + </para> + </section> + + <section> + <title>Using Eviction Policies</title> + <para> + Eviction policies are the counterpart to cache loaders. They are necessary to make sure the cache does not run + out of memory and when the cache starts to fill, + an eviction algorithm running in a separate thread evicts in-memory state and frees up + memory. If configured with a cache loader, the state can then be retrieved from the cache loader if needed. + </para> + <para> + Eviction policies can be configured on a per-region basis, so different subtrees in the cache could have + different eviction preferences. + + JBoss Cache ships with several eviction policies: + <itemizedlist> + <listitem> + <literal>org.jboss.cache.eviction.LRUPolicy</literal> + - an eviction policy that evicts the least recently used nodes when thresholds are hit. + </listitem> + <listitem> + <literal>org.jboss.cache.eviction.LFUPolicy</literal> + - an eviction policy that evicts the least frequently used nodes when thresholds are hit. + </listitem> + <listitem> + <literal>org.jboss.cache.eviction.MRUPolicy</literal> + - an eviction policy that evicts the most recently used nodes when thresholds are hit. + </listitem> + <listitem> + <literal>org.jboss.cache.eviction.FIFOPolicy</literal> + - an eviction policy that creates a first-in-first-out queue and evicts the oldest nodes when thresholds + are hit. + </listitem> + <listitem> + <literal>org.jboss.cache.eviction.ExpirationPolicy</literal> + - an eviction policy that selects nodes for eviction based on an expiry time each node is configured + with. + </listitem> + <listitem> + <literal>org.jboss.cache.eviction.ElementSizePolicy</literal> + - an eviction policy that selects nodes for eviction based on the number of key/value pairs held in the + node. + </listitem> + </itemizedlist> + Detailed configuration and implementing custom eviction policies are discussed in the + <link linkend="eviction_policies">chapter dedicated to eviction policies</link>. + </para> + </section> +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/batching.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/batching.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/batching.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,60 @@ +<chapter id="batching"> + <title>Batching API</title> + <section id="batching.intro"> + <title>Introduction</title> + <para> + The batching API, introduced in JBoss Cache 3.x, is intended as a mechanism to batch the way calls are replicated + independent of JTA transactions. + </para> + <para> + This is useful when you want to batch up replication calls within a scope finer than that of any ongoing JTA transactions. + </para> + </section> + <section id="batching.configuring"> + <title>Configuring batching</title> + <para> + To use batching, you need to enable invocation batching in your cache configuration, either on the <literal>Configuration</literal> object: + </para> + <programlisting role="JAVA"><![CDATA[ + Configuration.setInvocationBatchingEnabled(true); + ]]></programlisting> + <para> + or in your XML file: + </para> + <programlisting role="XML"><![CDATA[ + <invocationBatching enabled="true"/> + ]]></programlisting> + <para> + By default, invocation batching is disabled. Note that you do <emphasis>not</emphasis> have to have a transaction + manager defined to use batching. + </para> + </section> + + <section id="batching.api"> + <title>Batching API</title> + <para> + Once you have configured your cache to use batching, you use it by calling <literal>startBatch()</literal> + and <literal>endBatch()</literal> on <literal>Cache</literal>. E.g., + </para> + <programlisting role="JAVA"><![CDATA[ + Cache cache = getCache(); + + // not using a batch + cache.put("/a", "key", "value"); // will replicate immediately + + // using a batch + cache.startBatch(); + cache.put("/a", "key", "value"); + cache.put("/b", "key", "value"); + cache.put("/c", "key", "value"); + cache.endBatch(true); // This will now replicate the modifications since the batch was started. + + cache.startBatch(); + cache.put("/a", "key", "value"); + cache.put("/b", "key", "value"); + cache.put("/c", "key", "value"); + cache.endBatch(false); // This will "discard" changes made in the batch + + ]]></programlisting> + </section> +</chapter> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/cache_loaders.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/cache_loaders.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/cache_loaders.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,1556 @@ +<chapter id="cache_loaders"> + <title>Cache Loaders</title> + <para>JBoss Cache can use a + <literal>CacheLoader</literal> + to back up the in-memory cache to a backend datastore. + If JBoss Cache is configured with a cache loader, then the following features are provided: + <itemizedlist> + <listitem>Whenever a cache element is accessed, and that element is not in + the cache (e.g. due to eviction or due to server restart), then the cache loader transparently + loads the element into the cache if found in the backend + store. + </listitem> + + <listitem>Whenever an element is modified, added or removed, then that + modification is persisted in the backend store via the cache loader. If + transactions are used, all modifications created within a transaction + are persisted. To this end, the + <literal>CacheLoader</literal> + takes part in the two + phase commit protocol run by the transaction manager, although it does not do so explicitly. + </listitem> + </itemizedlist> + </para> + + <section> + <title>The CacheLoader Interface and Lifecycle</title> + + <figure> + <title>The CacheLoader interface</title> + + <mediaobject> + <imageobject> + <imagedata fileref="CacheLoader.png"/> + </imageobject> + </mediaobject> + </figure> + + <para>The interaction between JBoss Cache and a + <literal>CacheLoader</literal> + implementation is as follows. When + <literal>CacheLoaderConfiguration</literal> + (see below) is non-null, an + instance of each configured + <literal>CacheLoader</literal> + is created when the cache is created, and started when the cache is started. + </para> + + <para> + <literal>CacheLoader.create()</literal> + and + <literal>CacheLoader.start()</literal> + are called when the cache is + started. Correspondingly, + <literal>stop()</literal> + and + <literal>destroy()</literal> + are called when the cache is + stopped. + </para> + + <para>Next, + <literal>setConfig()</literal> + and + <literal>setCache()</literal> + are called. The latter can be used to + store a reference to the cache, the former is used to configure this + instance of the + <literal>CacheLoader</literal> + . For example, here a database cache loader + could establish a connection to the database. + </para> + + <para>The + <literal>CacheLoader</literal> + interface has a set of methods that are called + when no transactions are used: + <literal>get()</literal> + , + <literal>put()</literal> + , + <literal>remove()</literal> + and + <literal>removeData()</literal> + : they get/set/remove the value + immediately. These methods are described as javadoc comments in the + interface. + </para> + + <para>Then there are three methods that are used with transactions: + <literal>prepare()</literal> + , + <literal>commit()</literal> + and + <literal>rollback()</literal> + . The + <literal>prepare()</literal> + method + is called when a transaction is to be committed. It has a transaction + object and a list of modfications as argument. The transaction object + can be used as a key into a hashmap of transactions, where the values + are the lists of modifications. Each modification list has a number of + <literal>Modification</literal> + elements, which represent the changes + made to a cache for a given transaction. When + <literal>prepare()</literal> + returns successfully, then the cache loader + <emphasis>must</emphasis> + be able to commit (or rollback) the + transaction successfully. + </para> + + <para> + JBoss Cache takes care of calling prepare(), commit() + and rollback() on the cache loaders at the right time. + </para> + + <para>The + <literal>commit()</literal> + method tells the cache loader to + commit the transaction, and the + <literal>rollback()</literal> + method + tells the cache loader to discard the changes associated with that + transaction. + </para> + + <para>See the javadocs on this interface for a detailed explanation on each method and the contract + implementations would need to fulfill. + </para> + + </section> + + <section> + <title>Configuration</title> + + <para>Cache loaders are configured as follows in the JBoss Cache XML + file. Note that you can define several cache loaders, in + a chain. The impact is that the cache will look at all of the cache + loaders in the order they've been configured, until it finds a valid, + non-null element of data. When performing writes, all cache loaders are + written to (except if the + <literal>ignoreModifications</literal> + element has been set to + <literal>true</literal> + for a specific cache loader. See the configuration section below for + details. + </para> + + <programlisting role="XML"><![CDATA[ +... + + + +<loaders passivation="false" shared="false"> + <preload> +  + <node fqn="/some/stuff"/> + </preload> +  + <loader class="org.jboss.cache.loader.JDBCCacheLoader" async="false" fetchPersistentState="true" + ignoreModifications="false" purgeOnStartup="false"> + <properties> + cache.jdbc.driver=com.mysql.jdbc.Driver + cache.jdbc.url=jdbc:mysql://localhost:3306/jbossdb + cache.jdbc.user=root + cache.jdbc.password= + </properties> + </loader> + </loaders> +]]></programlisting> + + <para>The + <literal>class</literal> + element defines the + class of the cache loader implementation. (Note that, because of a bug in + the properties editor in JBoss AS, backslashes in variables for Windows + filenames might not get expanded correctly, so replace="false" may be + necessary). Note that an implementation of cache loader has to have an empty + constructor. + </para> + + <para>The + <literal>properties</literal> + element defines a configuration + specific to the given implementation. The filesystem-based + implementation for example defines the root directory to be used, + whereas a database implementation might define the database URL, name + and password to establish a database connection. This configuration is + passed to the cache loader implementation via + <literal>CacheLoader.setConfig(Properties)</literal> + . Note that + backspaces may have to be escaped. + </para> + + <para> + <literal>preload</literal> + allows us to define a list of nodes, or + even entire subtrees, that are visited by the cache on startup, in order + to preload the data associated with those nodes. The default ("/") loads + the entire data available in the backend store into the cache, which is + probably not a good idea given that the data in the backend store might + be large. As an example, + <literal>/a, + /product/catalogue + </literal> + loads the subtrees + <literal>/a</literal> + and + <literal>/product/catalogue</literal> + into the cache, but nothing + else. Anything else is loaded lazily when accessed. Preloading makes + sense when one anticipates using elements under a given subtree + frequently. + . + </para> + + <para> + <literal>fetchPersistentState</literal> + determines whether or not + to fetch the persistent state of a cache when joining a cluster. Only + one configured cache loader may set this property to true; if more than + one cache loader does so, a configuration exception will be thrown when + starting your cache service. + </para> + + <para> + <literal>async</literal> + determines whether writes to the cache + loader block until completed, or are run on a separate thread so writes + return immediately. If this is set to true, an instance of + <literal>org.jboss.cache.loader.AsyncCacheLoader</literal> + is + constructed with an instance of the actual cache loader to be used. The + <literal>AsyncCacheLoader</literal> + then delegates all requests to the + underlying cache loader, using a separate thread if necessary. See the + Javadocs on + <literal>AsyncCacheLoader</literal> + for more details. If unspecified, the + <literal>async</literal> + element + defaults to + <literal>false</literal> + . + </para> + + <para> + <emphasis role="bold">Note on using the + <literal>async</literal> + element: + </emphasis> + there is always the possibility of dirty reads since + all writes are performed asynchronously, and it is thus impossible to + guarantee when (and even if) a write succeeds. This needs to be kept in + mind when setting the + <literal>async</literal> + element to true. + </para> + + <para> + <literal>ignoreModifications</literal> + determines whether write + methods are pushed down to the specific cache loader. Situations may + arise where transient application data should only reside in a file + based cache loader on the same server as the in-memory cache, for + example, with a further shared + <literal>JDBCCacheLoader</literal> + used by all servers in + the network. This feature allows you to write to the 'local' file cache + loader but not the shared + <literal>JDBCCacheLoader</literal> + . This property defaults to + <literal>false</literal> + , so writes are propagated to all cache loaders + configured. + </para> + + <para> + <literal>purgeOnStatup</literal> + empties the specified cache loader + (if + <literal>ignoreModifications</literal> + is + <literal>false</literal> + ) + when the cache loader starts up. + </para> + + <para> + <literal>shared</literal> + indicates that the cache loader is shared among different cache instances, for example where all instances + in a + cluster use the same JDBC settings t talk to the same remote, shared database. Setting this to + <literal>true</literal> + prevents repeated and unnecessary writes of the same data to the cache loader by different cache instances. + Default value is + <literal>false</literal> + . + </para> + + <section id="sscl"> + <title>Singleton Store Configuration</title> + + <programlisting role="XML"><![CDATA[ + <loaders passivation="false" shared="true"> + <preload> + <node fqn="/a/b/c"/> + <node fqn="/f/r/s"/> + </preload> + +  + <loader class="org.jboss.cache.loader.JDBCCacheLoader" async="false" fetchPersistentState="false" + ignoreModifications="false" purgeOnStartup="false"> + <properties> + cache.jdbc.datasource=java:/DefaultDS + </properties> + <singletonStore enabled="true" class="org.jboss.cache.loader.SingletonStoreCacheLoader"> + <properties> + pushStateWhenCoordinator=true + pushStateWhenCoordinatorTimeout=20000 + </properties> + </singletonStore> + </loader> + </loaders> + ]]></programlisting> + <para> + <literal>singletonStore</literal> + element enables modifications to be stored by only one node in the cluster, + the coordinator. Essentially, whenever any data comes in to some node + it is always replicated so as to keep the caches' in-memory states in + sync; the coordinator, though, has the sole responsibility of pushing + that state to disk. This functionality can be activated setting the + <literal>enabled</literal> + subelement to true in all nodes, but + again only the coordinator of the cluster will store the modifications + in the underlying cache loader as defined in + <literal>loader</literal> + element. You cannot define a cache loader as + <literal>shared</literal> + and with + <literal>singletonStore</literal> + enabled at the same time. + Default value for + <literal>enabled</literal> + is + <literal>false</literal> + . + </para> + + <para> + Optionally, within the + <literal>singletonStore</literal> + element, you can define a + <literal>class</literal> + element that specifies the implementation class that provides the + singleton store functionality. This class must extend + <literal>org.jboss.cache.loader.AbstractDelegatingCacheLoader</literal> + , and if absent, it defaults to + <literal>org.jboss.cache.loader.SingletonStoreCacheLoader</literal> + . + </para> + + <para> + The + <literal>properties</literal> + subelement defines properties that allow changing the behavior of the + class providing the singleton store functionality. By default, + <literal>pushStateWhenCoordinator</literal> + and + <literal>pushStateWhenCoordinatorTimeout</literal> + properties have been defined, but more could be added as + required by the user-defined class providing singleton store + functionality. + </para> + + <para> + <literal>pushStateWhenCoordinator</literal> + allows the in-memory + state to be pushed to the cache store when a node becomes the + coordinator, as a result of the new election of coordinator due to a + cluster topology change. This can be very useful in situations where the + coordinator crashes and there's a gap in time until the new coordinator + is elected. During this time, if this property was set to + <literal>false</literal> + and the + cache was updated, these changes would never be persisted. Setting this + property to + <literal>true</literal> + would ensure that any changes during this process also + get stored in the cache loader. You would also want to set this property + to + <literal>true</literal> + if each node's cache loader is configured with a different + location. Default value is + <literal>true</literal> + . + </para> + + <para> + <literal>pushStateWhenCoordinatorTimeout</literal> + is only relevant if + <literal>pushStateWhenCoordinator</literal> + is + <literal>true</literal> + in which case, sets the maximum number of milliseconds that the process + of pushing the in-memory state to the underlying cache loader should take, + reporting a + <literal>PushStateException</literal> + if exceeded. Default value is 20000. + </para> + + <para> + <emphasis role="bold">Note on using the + <literal>singletonStore</literal> + element: + </emphasis> + setting + up a cache loader as a singleton and using cache passivation (via + evictions) can lead to undesired effects. If a node is to be passivated + as a result of an eviction, while the cluster is in the process of + electing a new coordinator, the data will be lost. This is because no + coordinator is active at that time and therefore, none of the nodes in + the cluster will store the passivated node. A new coordinator is elected + in the cluster when either, the coordinator leaves the cluster, the + coordinator crashes or stops responding. + </para> + </section> + + </section> + + <section id="cl.impls"> + + <title>Shipped Implementations</title> + + <para>The currently available implementations shipped with JBoss Cache are as follows.</para> + + <section> + <title>File system based cache loaders</title> + <para> + JBoss Cache ships with several cache loaders that utilize the file system as a data store. They all + require + that the + <literal><![CDATA[<loader><properties>]]></literal> + configuration element + contains a + <literal>location</literal> + property, which maps to a directory to be used as a persistent store. + (e.g., + <literal>location=/tmp/myDataStore</literal> + ). Used mainly for testing and not recommended for production use. + </para> + <itemizedlist> + <listitem> + <para> + <literal>FileCacheLoader</literal> + , which is a simple filesystem-based implementation. By default, this cache + loader checks for any potential character portability issues in the + location or tree node names, for example invalid characters, producing + warning messages. These checks can be disabled adding + <literal>check.character.portability</literal> + property to the + <literal><![CDATA[<properties>]]></literal> + element and setting it to + <literal>false</literal> + (e.g., + <literal>check.character.portability=false</literal> + ). + </para> + <para> + The FileCacheLoader has some severe limitations which restrict its use in a production + environment, or if used in such an environment, it should be used with due care and sufficient + understanding of these limitations. + <itemizedlist> + <listitem>Due to the way the FileCacheLoader represents a tree structure on disk + (directories and + files) traversal is inefficient for deep trees. + </listitem> + <listitem>Usage on shared filesystems like NFS, Windows shares, etc. should be avoided as + these do + not implement proper file locking and can cause data corruption. + </listitem> + <listitem>Usage with an isolation level of NONE can cause corrupt writes as multiple threads + attempt to write to the same file. + </listitem> + <listitem>File systems are inherently not transactional, so when attempting to use your + cache in a + transactional context, failures when writing to the file (which happens during the + commit phase) + cannot be recovered. + </listitem> + </itemizedlist> + + As a rule of thumb, it is recommended that the FileCacheLoader not be used in a highly + concurrent, + transactional or stressful environment, and its use is restricted to testing. + </para> + </listitem> + + <listitem> + <para> + <literal>BdbjeCacheLoader</literal> + , which is a cache loader implementation based on the Oracle/Sleepycat's + <ulink url="http://www.oracle.com/database/berkeley-db/index.html">BerkeleyDB Java Edition + </ulink> + . + </para> + </listitem> + + <listitem> + <para> + <literal>JdbmCacheLoader</literal> + , which is a cache loader + implementation based on the + <ulink url="http://jdbm.sourceforge.net/">JDBM engine</ulink> + , a fast and free alternative to + BerkeleyDB. + </para> + </listitem> + </itemizedlist> + + <para>Note that the BerkeleyDB implementation is much more efficient than + the filesystem-based implementation, and provides transactional + guarantees, but requires a commercial license if distributed with an + application (see http://www.oracle.com/database/berkeley-db/index.html for + details). + </para> + + </section> + + <section> + <title>Cache loaders that delegate to other caches</title> + <itemizedlist> + <listitem> + <para> + <literal>LocalDelegatingCacheLoader</literal> + , which enables + loading from and storing to another local (same JVM) cache. + </para> + </listitem> + <listitem> + <para> + <literal>ClusteredCacheLoader</literal> + , which allows querying + of other caches in the same cluster for in-memory data via the same + clustering protocols used to replicate data. Writes are + <emphasis>not</emphasis> + 'stored' though, as replication would + take care of any updates needed. You need to specify a property + called + <literal>timeout</literal> + , a long value telling the cache + loader how many milliseconds to wait for responses from the cluster + before assuming a null value. For example, + <literal>timeout = 3000</literal> + would use a timeout value of 3 seconds. + </para> + </listitem> + </itemizedlist> + </section> + + + <section id="cl.jdbc"> + <title>JDBCCacheLoader</title> + + <para>JBossCache is distributed with a JDBC-based cache loader + implementation that stores/loads nodes' state into a relational database. + The implementing class is + <literal>org.jboss.cache.loader.JDBCCacheLoader</literal> + . + </para> + + <para>The current implementation uses just one table. Each row in the table + represents one node and contains three columns: + <itemizedlist> + <listitem>column for + <literal>Fqn</literal> + (which is also a primary key + column) + </listitem> + + <listitem>column for node contents (attribute/value + pairs) + </listitem> + + <listitem>column for parent + <literal>Fqn</literal> + </listitem> + </itemizedlist> + </para> + + <para> + <literal>Fqn</literal>s are stored as strings. Node content is stored + as a BLOB. + <emphasis>WARNING:</emphasis> + JBoss Cache does not impose any + limitations on the types of objects used in + <literal>Fqn</literal> + but this implementation of + cache loader requires + <literal>Fqn</literal> + to contain only objects of type + <literal>java.lang.String</literal> + . Another limitation for + <literal>Fqn</literal> + is its + length. Since + <literal>Fqn</literal> + is a primary key, its default column type is + <literal>VARCHAR</literal> + which can store text values up to some + maximum length determined by the database in use. + </para> + + <para>See + <ulink url="http://www.jboss.org/community/docs/DOC-10864">this wiki page</ulink> + for configuration tips with specific database systems. + </para> + + <section> + <title>JDBCCacheLoader configuration</title> + + <section> + <title>Table configuration</title> + + <para>Table and column names as well as column types are + configurable with the following properties. + <itemizedlist> + <listitem> + <emphasis>cache.jdbc.table.name</emphasis> + - the name + of the table. Can be prepended with schema name for the given table: + <literal>{schema_name}.{table_name}</literal>. + The default value is 'jbosscache'. + </listitem> + + <listitem> + <emphasis>cache.jdbc.table.primarykey</emphasis> + - the + name of the primary key for the table. The default value is + 'jbosscache_pk'. + </listitem> + + <listitem> + <emphasis>cache.jdbc.table.create</emphasis> + - can be + true or false. Indicates whether to create the table during startup. + If true, the table is created if it doesn't already exist. The + default value is true. + </listitem> + + <listitem> + <emphasis>cache.jdbc.table.drop</emphasis> + - can be + true or false. Indicates whether to drop the table during shutdown. The + default value is true. + </listitem> + + <listitem> + <emphasis>cache.jdbc.fqn.column</emphasis> + - FQN + column name. The default value is 'fqn'. + </listitem> + + <listitem> + <emphasis>cache.jdbc.fqn.type</emphasis> + - FQN column + type. The default value is 'varchar(255)'. + </listitem> + + <listitem> + <emphasis>cache.jdbc.node.column</emphasis> + - node + contents column name. The default value is 'node'. + </listitem> + + <listitem> + <emphasis>cache.jdbc.node.type</emphasis> + - node + contents column type. The default value is 'blob'. This type must specify + a valid binary data type for the database being used. + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>DataSource</title> + + <para>If you are using JBossCache in a managed environment (e.g., an + application server) you can specify the JNDI name of the DataSource + you want to use. + <itemizedlist> + <listitem> + <emphasis>cache.jdbc.datasource</emphasis> + - JNDI name + of the DataSource. The default value is + <literal>java:/DefaultDS</literal> + . + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>JDBC driver</title> + + <para>If you are + <emphasis>not</emphasis> + using DataSource you have + the following properties to configure database access using a JDBC + driver. + <itemizedlist> + <listitem> + <emphasis>cache.jdbc.driver</emphasis> + - fully + qualified JDBC driver name. + </listitem> + + <listitem> + <emphasis>cache.jdbc.url</emphasis> + - URL to connect + to the database. + </listitem> + + <listitem> + <emphasis>cache.jdbc.user</emphasis> + - user name to + connect to the database. + </listitem> + + <listitem> + <emphasis>cache.jdbc.password</emphasis> + - password to + connect to the database. + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>c3p0 connection pooling</title> + + <para>JBoss Cache implements JDBC connection pooling when running outside of an application server + standalone using + the c3p0:JDBC DataSources/Resource Pools library. In order to enable it, just edit the following + property: + <itemizedlist> + <listitem> + <emphasis>cache.jdbc.connection.factory</emphasis> + - Connection factory class name. + If not set, it defaults to standard non-pooled implementation. To enable c3p0 pooling, + just set + the + connection factory class for c3p0. See example below. + </listitem> + </itemizedlist> + </para> + + <para>You can also set any c3p0 parameters in the same cache loader properties section but don't + forget + to + start the property name with 'c3p0.'. To find a list of available properties, please check the + c3p0 documentation for the c3p0 library version distributed in + <ulink url="http://sourceforge.net/projects/c3p0">c3p0:JDBC DataSources/Resource Pools</ulink> + . + Also, in order to provide quick and easy way to try out different pooling + parameters, any of these properties can be set via a System property overriding any values these + properties might have in the JBoss Cache XML configuration file, for example: + <literal>-Dc3p0.maxPoolSize=20</literal> + . + If a c3p0 property is not defined in either the configuration file or as a System property, + default + value, as indicated in the c3p0 documentation, will apply. + </para> + </section> + + <section> + <title>Configuration example</title> + + <para>Below is an example of a JDBCCacheLoader using Oracle as + database. The CacheLoaderConfiguration XML element contains an + arbitrary set of properties which define the database-related + configuration. + </para> + + <programlisting role="XML"><![CDATA[ +<loaders passivation="false" shared="false"> + <preload> + <node fqn="/some/stuff"/> + </preload> +  + <loader class="org.jboss.cache.loader.JDBCCacheLoader" async="false" fetchPersistentState="true" + ignoreModifications="false" purgeOnStartup="false"> + <properties> + cache.jdbc.table.name=jbosscache + cache.jdbc.table.create=true + cache.jdbc.table.drop=true + cache.jdbc.table.primarykey=jbosscache_pk + cache.jdbc.fqn.column=fqn + cache.jdbc.fqn.type=VARCHAR(255) + cache.jdbc.node.column=node + cache.jdbc.node.type=BLOB + cache.jdbc.parent.column=parent + cache.jdbc.driver=oracle.jdbc.OracleDriver + cache.jdbc.url=jdbc:oracle:thin:@localhost:1521:JBOSSDB + cache.jdbc.user=SCOTT + cache.jdbc.password=TIGER + </properties> + </loader> + </loaders> +]]></programlisting> + + <para>As an alternative to configuring the entire JDBC connection, + the name of an existing data source can be given: + </para> + + <programlisting role="XML"><![CDATA[ + <loaders passivation="false" shared="false"> + <preload> + <node fqn="/some/stuff"/> + </preload> +  + <loader class="org.jboss.cache.loader.JDBCCacheLoader" async="false" fetchPersistentState="true" + ignoreModifications="false" purgeOnStartup="false"> + <properties> + cache.jdbc.datasource=java:/DefaultDS + </properties> + </loader> + </loaders> +]]></programlisting> + + <para>Cconfiguration example for a cache loader using c3p0 JDBC connection pooling:</para> + + <programlisting role="XML"><![CDATA[ + <loaders passivation="false" shared="false"> + <preload> + <node fqn="/some/stuff"/> + </preload> +  + <loader class="org.jboss.cache.loader.JDBCCacheLoader" async="false" fetchPersistentState="true" + ignoreModifications="false" purgeOnStartup="false"> + <properties> + cache.jdbc.table.name=jbosscache + cache.jdbc.table.create=true + cache.jdbc.table.drop=true + cache.jdbc.table.primarykey=jbosscache_pk + cache.jdbc.fqn.column=fqn + cache.jdbc.fqn.type=VARCHAR(255) + cache.jdbc.node.column=node + cache.jdbc.node.type=BLOB + cache.jdbc.parent.column=parent + cache.jdbc.driver=oracle.jdbc.OracleDriver + cache.jdbc.url=jdbc:oracle:thin:@localhost:1521:JBOSSDB + cache.jdbc.user=SCOTT + cache.jdbc.password=TIGER + cache.jdbc.connection.factory=org.jboss.cache.loader.C3p0ConnectionFactory + c3p0.maxPoolSize=20 + c3p0.checkoutTimeout=5000 + </properties> + </loader> + </loaders> +]]></programlisting> + + </section> + </section> + </section> + + <section id="cl.s3"> + <title>S3CacheLoader</title> + + <para>The + <literal>S3CacheLoader</literal> + uses the + <ulink url="http://aws.amazon.com/">Amazon S3</ulink> + (Simple Storage Solution) + for storing cache data. + Since Amazon S3 is remote network storage and has fairly high latency, + it is really best for caches that store large pieces of data, such as media + or files. + But consider this cache loader over the JDBC or + file system based cache loaders if you want remotely managed, highly reliable + storage. Or, use it for applications running on Amazon's EC2 (Elastic Compute Cloud). + </para> + + <para> + If you're planning to use Amazon S3 for storage, consider using it with JBoss Cache. + JBoss Cache itself provides in-memory caching for your data to minimize the amount of + remote access calls, thus reducing the latency and cost of fetching your Amazon S3 data. + With cache replication, you are also able to load data from your local cluster + without having to remotely access it every time. + </para> + + <para> + Note that Amazon S3 does not support transactions. If transactions + are used in your application then there is some possibility of state + inconsistency when using this cache loader. However, writes are atomic, in + that if a write fails nothing is considered written and data is never + corrupted. + </para> + + <para> + Data is stored in keys based on the Fqn of the Node and Node data is + serialized as a java.util.Map using the + <literal>CacheSPI.getMarshaller()</literal> + instance. + Read the javadoc on how data is structured and stored. + Data is stored using Java serialization. + Be aware this means data is not readily accessible over HTTP to + non-JBoss Cache clients. Your feedback and help would be appreciated + to extend this cache loader for that purpose. + </para> + + <para> + With this cache loader, single-key operations such as + <literal>Node.remove(Object)</literal> + and + <literal>Node.put(Object, Object)</literal> + are the slowest as data is stored in a single Map instance. + Use bulk operations such as + <literal>Node.replaceAll(Map)</literal> + and + <literal>Node.clearData()</literal> + for more efficiency. + Try the + <literal>cache.s3.optimize</literal> + option as well. + </para> + + <section> + <title>Amazon S3 Library</title> + <para>The S3 cache loader is provided with the default + distribution but requires a library to access the service + at runtime. This runtime library may be obtained through a Sourceforge Maven + Repository. Include the following sections in your pom.xml file: + </para> + <programlisting role="XML"><![CDATA[ + <repository> + <id>e-xml.sourceforge.net</id> + <url>http://e-xml.sourceforge.net/maven2/repository</url> + </repository> + ... + <dependency> + <groupId>net.noderunner</groupId> + <artifactId>amazon-s3</artifactId> + <version>1.0.0.0</version> + <scope>runtime</scope> + </dependency> + ]]> + </programlisting> + If you do not use Maven, you can still download the + amazon-s3 library by navigating the repository or through + <ulink url="http://e-xml.sourceforge.net/maven2/repository/net/noderunner/amazon-s3/1..."> + this URL</ulink>. + </section> + + <section> + <title>Configuration</title> + <para>At a minimum, you must configure your Amazon S3 access key and + secret access key. The following configuration keys are listed in general + order of utility. + </para> + + <para> + <itemizedlist> + <listitem> + <literal>cache.s3.accessKeyId</literal> + - + Amazon S3 Access Key, available from your account profile. + </listitem> + + <listitem> + <literal>cache.s3.secretAccessKey</literal> + - + Amazon S3 Secret Access Key, available from your account profile. + As this is a password, be careful not to distribute it or include + this secret key in built software. + </listitem> + + <listitem> + <literal>cache.s3.secure</literal> + - + The default is<literal>false</literal>: + Traffic is sent unencrypted over the public Internet. + Set to + <literal>true</literal> + to use HTTPS. + Note that unencrypted uploads and downloads use less CPU. + </listitem> + + <listitem> + <literal>cache.s3.bucket</literal> + - + Name of the bucket to store data. + For different caches using the same access key, use a different bucket name. + Read the S3 documentation on the definition of a bucket. + The default value is<literal>jboss-cache</literal>. + </listitem> + + <listitem> + <literal>cache.s3.callingFormat</literal> + - + One of<literal>PATH</literal>,<literal>SUBDOMAIN</literal>, or + <literal>VANITY</literal>. + Read the S3 documentation on the use of calling domains. + The default value is<literal>SUBDOMAIN</literal>. + </listitem> + + <listitem> + <literal>cache.s3.optimize</literal> + - + The default is<literal>false</literal>. + If true, + <literal>put(Map)</literal> + operations + replace the data stored at an Fqn rather than attempt + to fetch and merge. (This option is fairly experimental + at the moment.) + </listitem> + + <listitem> + <literal>cache.s3.parentCache</literal> + - + The default is<literal>true</literal>. + Set this value to + <literal>false</literal> + if you are using multiple caches + sharing the same S3 bucket, that remove parent nodes of nodes being created + in other caches. (This is not a common use case.) + <para> + JBoss Cache stores nodes in a tree format and automatically + creates intermediate parent nodes as necessary. + The S3 cache loader must also create these parent nodes as well + to allow for operations such as + <literal>getChildrenNames</literal> + to work + properly. Checking if all parent nodes exists for every + <literal>put</literal> + operation is fairly expensive, so by default the cache loader caches + the existence of these parent nodes. + </para> + </listitem> + + <listitem> + <literal>cache.s3.location</literal> + - + This choses a primary storage location for your data + to reduce loading and retrieval latency. + Set to + <literal>EU</literal> + to store data in Europe. + The default is<literal>null</literal>, to store data in + the United States. + </listitem> + </itemizedlist> + </para> + </section> + + </section> + + <section id="cl.tcp"> + <title>TcpDelegatingCacheLoader</title> + + <para>This cache loader allows to delegate loads and stores to another + instance of JBoss Cache, which could reside (a) in the same address + space, (b) in a different process on the same host, or (c) in a + different process on a different host. + </para> + + <para>A TcpDelegatingCacheLoader talks to a remote + <literal>org.jboss.cache.loader.tcp.TcpCacheServer</literal> + , + which can be a standalone process started on the command line, or embedded as an MBean inside + JBoss AS. The + <literal>TcpCacheServer</literal> + has a reference to another JBoss Cache instance, which + it can create itself, or which is given to it (e.g. by JBoss, using + dependency injection). + </para> + + <para> + As of JBoss Cache 2.1.0, the + <literal>TcpDelegatingCacheLoader</literal> + transparently handles reconnects if the connection + to the TcpCacheServer is lost. + </para> + + <para>The TcpDelegatingCacheLoader is configured with the host and port of the remote TcpCacheServer, and + uses + this to communicate to + it. In addition, 2 new optional parameters are used to control transparent reconnecting to the + TcpCacheServer. + The + <literal>timeout</literal> + property (defaults to 5000) specifies the length of time the cache loader must continue + retrying to connect to the TcpCacheServer before giving up and throwing an exception. The + <literal>reconnectWaitTime</literal> + (defaults to 500) is how long the cache loader should wait before attempting a reconnect if it detects a + communication failure. + The last two parameters can be used to add a level of fault tolerance to the cache loader, do deal with + TcpCacheServer restarts. + </para> + + <para>The configuration looks as follows:</para> + + <programlisting role="XML"><![CDATA[ + <loaders passivation="false" shared="false"> + <preload> + <node fqn="/"/> + </preload> +  + <loader class="org.jboss.cache.loader.TcpDelegatingCacheLoader"> + <properties> + host=myRemoteServer + port=7500 + timeout=10000 + reconnectWaitTime=250 + </properties> + </loader> + </loaders> +]]></programlisting> + + <para>This means this instance of JBoss Cache will delegate all load + and store requests to the remote TcpCacheServer running on + <literal>myRemoteServer:7500</literal> + . + </para> + + <para>A typical use case could be multiple replicated instances of + JBoss Cache in the same cluster, all delegating to the same + TcpCacheServer instance. The TcpCacheServer might itself delegate to a + database via JDBCCacheLoader, but the point here is that - if we have + 5 nodes all accessing the same dataset - they will load the data from + the TcpCacheServer, which has do execute one SQL statement per + unloaded data set. If the nodes went directly to the database, then + we'd have the same SQL executed multiple times. So TcpCacheServer + serves as a natural cache in front of the DB (assuming that a network + round trip is faster than a DB access (which usually also include a + network round trip)). + </para> + + <para>To alleviate single point of failure, we could configure several cache loaders. + The first cache loader is a ClusteredCacheLoader, the second a TcpDelegatingCacheLoader, and the + last a JDBCacheLoader, effectively defining our cost of access to a + cache in increasing order. + </para> + + </section> + + <section id="cl.transforming"> + <title>Transforming Cache Loaders</title> + + <para>The way cached data is written to + <literal>FileCacheLoader</literal> + and + <literal>JDBCCacheLoader</literal> + based cache stores has changed in JBoss Cache 2.0 in such way that + these cache loaders now write and read data using the same marhalling framework used to replicate data + across the network. Such change is trivial for replication purposes as it just requires the rest of the + nodes to understand this format. However, changing the format of the data in cache stores brings up a + new + problem: how do users, which have their data stored in JBoss Cache 1.x.x format, migrate their stores to + JBoss Cache 2.0 format? + </para> + + <para>With this in mind, JBoss Cache 2.0 comes with two cache loader implementations called + <literal>org.jboss.cache.loader.TransformingFileCacheLoader</literal> + and + <literal>org.jboss.cache.loader.TransformingJDBCCacheLoader</literal> + located within the optional + jbosscache-cacheloader-migration.jar file. These are one-off cache loaders that read data from the + cache store in JBoss Cache 1.x.x format and write data to cache stores in JBoss Cache 2.0 format. + </para> + + <para>The idea is for users to modify their existing cache configuration file(s) momentarily to use these + cache loaders and for them to create a small Java application that creates an instance of this cache, + recursively reads the entire cache and writes the data read back into the cache. Once the data is + transformed, users can revert back to their original cache configuration file(s). In order to help the + users + with this task, a cache loader migration example has been constructed which can be located under the + <literal>examples/cacheloader-migration</literal> + directory within the JBoss Cache distribution. This + example, called + <literal>examples.TransformStore</literal> + , is independent of the actual data stored in + the cache as it writes back whatever it was read recursively. It is highly recommended that anyone + interested in porting their data run this example first, which contains a + <literal>readme.txt</literal> + file with detailed information about the example itself, and also use it as base for their own + application. + </para> + + </section> + + </section> + + + <section id="cl.pass"> + <title>Cache Passivation</title> + + <para>A cache loader can be used to enforce node passivation and + activation on eviction in a cache. + </para> + + <para> + <emphasis>Cache Passivation</emphasis> + is the process of removing + an object from in-memory cache and writing it to a secondary data store + (e.g., file system, database) on eviction. + <emphasis>Cache + Activation + </emphasis> + is the process of restoring an object from the + data store into the in-memory cache when it's needed to be used. In both + cases, the configured cache loader will be used to read from the data + store and write to the data store. + </para> + + <para>When an eviction policy in effect evicts a node + from the cache, if passivation is enabled, a notification that the node + is being passivated will be emitted to the cache listeners and the + node and its children will be stored in the cache loader store. When a + user attempts to retrieve a node that was evicted earlier, the node is loaded + (lazy loaded) from the cache loader store into memory. When + the node and its children have been loaded, they're removed from the + cache loader and a notification is emitted to the cache listeners + that the node has been activated. + </para> + + <para>To enable cache passivation/activation, you can set + <literal>passivation</literal> + to true. The default is + <literal>false</literal> + . + When passivation is used, only the first cache loader configured is + used and all others are ignored. + </para> + + <section> + <title>Cache Loader Behavior with Passivation Disabled vs. Enabled</title> + + <para> + When passivation is disabled, whenever an element is modified, added or + removed, then that modification is persisted in the backend store via + the cache loader. There is no direct relationship between eviction and + cache loading. If you don't use eviction, what's in the persistent store + is basically a copy of what's in memory. If you do use eviction, what's + in the persistent store is basically a superset of what's in memory + (i.e. it includes nodes that have been evicted from memory). + </para> + + <para> + When passivation is enabled, there is a direct relationship between + eviction and the cache loader. Writes to the persistent store via the + cache loader only occur as part of the eviction process. Data is deleted + from the persistent store when the application reads it back into + memory. In this case, what's in memory and what's in the persistent + store are two subsets of the total information set, with no intersection between the subsets. + </para> + + <para> + Following is a simple example, showing what state is in RAM and in the + persistent store after each step of a 6 step process: + </para> + + <orderedlist> + <listitem>Insert /A</listitem> + <listitem>Insert /B</listitem> + <listitem>Eviction thread runs, evicts /A</listitem> + <listitem>Read /A</listitem> + <listitem>Eviction thread runs, evicts /B</listitem> + <listitem>Remove /B</listitem> + </orderedlist> + + <para>When passivation is disabled:</para> + <programlisting> + 1) Memory: /A Disk: /A + 2) Memory: /A, /B Disk: /A, /B + 3) Memory: /B Disk: /A, /B + 4) Memory: /A, /B Disk: /A, /B + 5) Memory: /A Disk: /A, /B + 6) Memory: /A Disk: /A + </programlisting> + + <para>When passivation is enabled:</para> + <programlisting> + 1) Memory: /A Disk: + 2) Memory: /A, /B Disk: + 3) Memory: /B Disk: /A + 4) Memory: /A, /B Disk: + 5) Memory: /A Disk: /B + 6) Memory: /A Disk: + </programlisting> + </section> + + </section> + + <section> + <title>Strategies</title> + <para> + This section discusses different patterns of combining different cache loader types and configuration + options to achieve specific outcomes. + </para> + + <section> + <title>Local Cache With Store</title> + + <para>This is the simplest case. We have a JBoss Cache instance, whose + cache mode is + <literal>LOCAL</literal> + , therefore no replication is going + on. The cache loader simply loads non-existing elements from the store + and stores modifications back to the store. When the cache is started, + depending on the + <literal>preload</literal> + element, certain data can + be preloaded, so that the cache is partly warmed up. + </para> + </section> + + <section> + <title>Replicated Caches With All Caches Sharing The Same Store</title> + + <para>The following figure shows 2 JBoss Cache instances sharing the same + backend store: + </para> + + <figure> + <title>2 nodes sharing a backend store</title> + + <mediaobject> + <imageobject> + <imagedata fileref="SharedCacheLoader.png"/> + </imageobject> + </mediaobject> + </figure> + + <para>Both nodes have a cache loader that accesses a common shared + backend store. This could for example be a shared filesystem (using + the FileCacheLoader), or a shared database. Because both nodes access + the same store, they don't necessarily need state transfer on + startup. + <footnote> + <para>Of course they can enable state transfer, if they want to + have a warm or hot cache after startup. + </para> + </footnote> + Rather, the + <literal>FetchInMemoryState</literal> + attribute could be set to false, resulting in a 'cold' cache, that + gradually warms up as elements are accessed and loaded for the first + time. This would mean that individual caches in a cluster might have + different in-memory state at any given time (largely depending on + their preloading and eviction strategies). + </para> + + <para>When storing a value, the writer takes care of storing the + change in the backend store. For example, if node1 made change C1 and + node2 C2, then node1 would tell its cache loader to store C1, and node2 + would tell its cache loader to store C2. + </para> + </section> + + <section> + <title>Replicated Caches With Only One Cache Having A Store</title> + + <figure> + <title>2 nodes but only one accesses the backend store</title> + + <mediaobject> + <imageobject> + <imagedata fileref="OnlyOneCacheLoader.png"/> + </imageobject> + </mediaobject> + </figure> + + <para>This is a similar case to the previous one, but here only one + node in the cluster interacts with a backend store via its + cache loader. All other nodes perform in-memory replication. The idea + here is all application state is kept in memory in each node, with + the existence of multiple caches making the data highly available. + (This assumes that a client that needs the data is able to somehow + fail over from one cache to another.) The single persistent backend + store then provides a backup copy of the data in case all caches in + the cluster fail or need to be restarted. + </para> + <para> + Note that here it may make sense for the cache loader to store + changes asynchronously, that is + <emphasis>not</emphasis> + on the caller's thread, in order not to slow + down the cluster by accessing (for example) a database. This is a + non-issue when using asynchronous replication. + </para> + <para> + A weakness with this architecture is that the cache with access + to the cache loader becomes a single point of failure. Furthermore, + if the cluster is restarted, the cache with the cache loader must + be started first (easy to forget). A solution to the first problem + is to configure a cache loader on each node, but set the + <literal>singletonStore</literal> + configuration to + <literal>true</literal>. With this kind of setup, one but only one + node will always be writing to a persistent store. However, this + complicates the restart problem, as before restarting you need + to determine which cache was writing before the shutdown/failure + and then start that cache first. + </para> + </section> + + <section> + <title>Replicated Caches With Each Cache Having Its Own Store</title> + + <figure> + <title>2 nodes each having its own backend store</title> + + <mediaobject> + <imageobject> + <imagedata fileref="LocalCacheLoader.png"/> + </imageobject> + </mediaobject> + </figure> + + <para>Here, each node has its own datastore. Modifications to the + cache are (a) replicated across the cluster and (b) persisted using + the cache loader. This means that all datastores have exactly the same + state. When replicating changes synchronously and in a transaction, + the two phase commit protocol takes care that all modifications are + replicated and persisted in each datastore, or none is replicated and + persisted (atomic updates). + </para> + + <para>Note that JBoss Cache is + <emphasis>not</emphasis> + an + XA Resource, that means it doesn't implement recovery. When used with a + transaction manager that supports recovery, this functionality is not + available. + </para> + + <para>The challenge here is state transfer: when a new node starts it + needs to do the following: + </para> + + <orderedlist> + <listitem> + <para>Tell the coordinator (oldest node in a cluster) to send it + the state. This is always a full state transfer, overwriting + any state that may already be present. + </para> + </listitem> + + <listitem> + <para>The coordinator then needs to wait until all in-flight + transactions have completed. During this time, it will not allow + for new transactions to be started. + </para> + </listitem> + + <listitem> + <para>Then the coordinator asks its cache loader for the entire + state using + <literal>loadEntireState()</literal> + . It then sends + back that state to the new node. + </para> + </listitem> + + <listitem> + <para>The new node then tells its cache loader to store that state + in its store, overwriting the old state. This is the + <literal>CacheLoader.storeEntireState()</literal> + method + </para> + </listitem> + + <listitem> + <para>As an option, the transient (in-memory) state can be + transferred as well during the state transfer. + </para> + </listitem> + + <listitem> + <para>The new node now has the same state in its backend store as + everyone else in the cluster, and modifications received from + other nodes will now be persisted using the local + cache loader. + </para> + </listitem> + </orderedlist> + + + </section> + + <section> + <title>Hierarchical Caches</title> + + <para>If you need to set up a hierarchy within a single JVM, you can + use the + <literal>LocalDelegatingCacheLoader</literal> + . This type of + hierarchy can currently only be set up programmatically. + </para> + + <para> + Hierarchical caches could also be set up spanning more than one JVM or server, using the + <literal>TcpDelegatingCacheLoader</literal> + . + <figure> + <title>TCP delegating cache loader</title> + + <mediaobject> + <imageobject> + <imagedata fileref="DelegatingCacheLoader.png"/> + </imageobject> + </mediaobject> + </figure> + + </para> + + </section> + + + <section> + <title>Multiple Cache Loaders</title> + + <para> + You can set up more than one cache loader in a chain. Internally, a delegating + <literal>ChainingCacheLoader</literal> + is used, with references to each + cache loader you have configured. Use cases vary depending on the type of cache loaders used in the + chain. + One example is + using a filesystem based cache loader, co-located on the same host as the JVM, used as an overflow for + memory. This ensures + data is available relatively easily and with low cost. An additional remote cache loader, such as a + <literal>TcpDelegatingCacheLoader</literal> + provides resilience between server restarts. + </para> + + <figure> + <title>Multiple cache loaders in a chain</title> + + <mediaobject> + <imageobject> + <imagedata fileref="MultipleCacheLoaders.png"/> + </imageobject> + </mediaobject> + </figure> + + </section> + + + </section> + + +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/compatibility.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/compatibility.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/compatibility.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,48 @@ +<chapter id="compatibility"> + <title>Version Compatibility and Interoperability</title> + + <section> + <title>API compatibility</title> + <para> + Within a major version, releases of JBoss Cache are meant to be compatible and + interoperable. Compatible in the sense that it should be possible to + upgrade an application from one version to another by simply replacing + jars. Interoperable in the sense that if two different versions of + JBoss Cache are used in the same cluster, they should be able to exchange + replication and state transfer messages. Note however that interoperability + requires use of the same JGroups version in all nodes in the cluster. + In most cases, the version of JGroups used by a version of JBoss Cache can + be upgraded. + </para> + + <para> + As such, JBoss Cache 2.x.x is not API or binary compatible with prior 1.x.x versions. + On the other hand, JBoss Cache 2.1.x will be API and binary compatible with 2.0.x. + </para> + + <para> + We have made best efforts, however, to keep JBoss Cache 3.x both binary and API compatible with 2.x. Still, + it is recommended that client code is updated not to use deprecated methods, classes and configuration files. + </para> + </section> + <section> + <title>Wire-level interoperability</title> + + <para> + A configuration parameter, <literal>Configuration.setReplicationVersion()</literal>, is available and is used + to control the wire format of inter-cache communications. They can be wound back from more + efficient and newer protocols to "compatible" versions when talking to older releases. + This mechanism allows us to improve JBoss Cache by using more efficient wire formats while + still providing a means to preserve interoperability. + </para> + </section> + <section> + <title>Compatibility Matrix</title> + <para> + A <ulink url="http://www.jboss.org/jbosscache/compatibility/index.html">compatibility matrix</ulink> is + maintained on the JBoss Cache website, which contains information on different versions of JBoss Cache, + JGroups and JBoss Application Server. + </para> + </section> + +</chapter> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,337 @@ +<chapter id="configuration"> + <title>Configuration</title> + + <section> + <title>Configuration Overview</title> + + <para> + The + <literal>org.jboss.cache.config.Configuration</literal> + class (along with its <link linkend="configuration.elements">component parts</link>) + is a Java Bean that encapsulates the configuration of the <literal>Cache</literal> + and all of its architectural elements (cache loaders, evictions policies, etc.) + </para> + + <para> + The <literal>Configuration</literal> exposes numerous properties which + are summarized in the <link linkend="configuration_reference">configuration reference</link> + section of this book and many of which are discussed in later chapters. Any time you see a configuration option + discussed in this book, you can assume that the <literal>Configuration</literal> + class or one of its component parts exposes a simple property setter/getter for that configuration option. + </para> + + </section> + + <section id="configuration.creation"> + <title>Creating a + <literal>Configuration</literal> + </title> + + <para> + As discussed in the <link linkend="api.create_start">User API section</link>, + before a <literal>Cache</literal> can be created, the <literal>CacheFactory</literal> + must be provided with a <literal>Configuration</literal> object or with a file name or + input stream to use to parse a <literal>Configuration</literal> from XML. The following sections describe + how to accomplish this. + </para> + + <section> + <title>Parsing an XML-based Configuration File</title> + <para> + The most convenient way to configure JBoss Cache is via an XML file. The JBoss Cache distribution ships + with a number of configuration files for common use cases. It is recommended that these files be used as + a starting point, and tweaked to meet specific needs. + </para> + + <para> + The simplest example of a configuration XML file, a cache configured to run in LOCAL mode, looks like this: + </para> + <programlisting role="XML"><![CDATA[ + +<?xml version="1.0" encoding="UTF-8"?> + +<jbosscache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" + xmlns="urn:jboss:jbosscache-core:config:3.1"> +</jbosscache> + + +]]></programlisting> + + <para> + This file uses sensible defaults for isolation levels, lock acquisition timeouts, locking modes, etc. Another, + more complete, sample XML file is included in the + <link linkend="sample_xml_file">configuration reference</link> + section of this book, + along with + <link linkend="configuration_reference">a handy look-up table</link> + explaining the various options. + </para> + </section> + <section id="configuration.validation"> + <title>Validating Configuration Files</title> + <para> + By default JBoss Cache will validate your XML configuration file against an XML schema and throw an + exception if the configuration is invalid. This can be overridden with the <literal>-Djbosscache.config.validate=false</literal> + JVM parameter. Alternately, you could specify your own schema to validate against, using the + <literal>-Djbosscache.config.schemaLocation=url</literal> parameter. + </para> + <para> + By default though, configuration files are validated against the JBoss Cache configuration schema, which is + included in the <literal>jbosscache-core.jar</literal> or on <literal>http://www.jboss.org/jbosscache/jbosscache-config-3.0.xsd</literal>. + Most XML editing tools can be used with this schema to ensure the configuration file you create is correct + and valid. + </para> + </section> + + <section> + <title>Programmatic Configuration</title> + <para> + In addition to the XML-based configuration above, the + <literal>Configuration</literal> + can be built up programatically, + using the simple property mutators exposed by + <literal>Configuration</literal> + and its components. When constructed, + the + <literal>Configuration</literal> + object is preset with JBoss Cache + defaults and can even be used as-is for a quick start. + </para> + + <programlisting role="JAVA"><![CDATA[ + Configuration config = new Configuration(); + config.setTransactionManagerLookupClass( GenericTransactionManagerLookup.class.getName() ); + config.setIsolationLevel(IsolationLevel.READ_COMMITTED); + config.setCacheMode(CacheMode.LOCAL); + config.setLockAcquisitionTimeout(15000); + + CacheFactory factory = new DefaultCacheFactory(); + Cache cache = factory.createCache(config); +]]></programlisting> + + <para> + Even the above fairly simple configuration is pretty tedious programming; + hence the preferred use of XML-based configuration. However, if your + application requires it, there is no reason not to use XML-based + configuration for most of the attributes, and then access the + <literal>Configuration</literal> + object to programatically change + a few items from the defaults, add an eviction region, etc. + </para> + + <para> + Note that configuration values may not be changed programmatically when a cache is running, + except those annotated as + <literal>@Dynamic</literal> + . Dynamic properties are also marked as such in the + <link linkend="configuration_reference">configuration reference</link> + table. Attempting to change a non-dynamic + property will result in a + <literal>ConfigurationException</literal> + . + </para> + </section> + + <section> + <title>Using an IOC Framework</title> + + <para> + The + <literal>Configuration</literal> + class and its + <link linkend="configuration.elements">component parts</link> + are all Java Beans that expose all config elements via simple setters + and getters. Therefore, any good IOC framework such as Spring, Google Guice, JBoss Microcontainer, etc. should be able to + build up a + <literal>Configuration</literal> + from an XML file in + the framework's own format. See the + <link linkend="deployment.microcontainer">deployment via the JBoss micrcontainer</link> + section for an example of this. + </para> + </section> + </section> + + <section id="configuration.elements"> + <title>Composition of a + <literal>Configuration</literal> + Object + </title> + + <para> + A + <literal>Configuration</literal> + is composed of a number of + subobjects: + + <mediaobject> + <imageobject> + <imagedata fileref="Configuration.png"/> + </imageobject> + </mediaobject> + </para> + + <para> + Following is a brief overview of the components of a + <literal>Configuration</literal> + . See the javadoc and the linked + chapters in this book for a more complete explanation of the + configurations associated with each component. + + <itemizedlist> + <listitem> + <literal>Configuration</literal> + : top level object + in the hierarchy; exposes the configuration properties listed in the + <link linkend="configuration_reference">configuration reference</link> + section of this book. + </listitem> + + <listitem> + <literal>BuddyReplicationConfig</literal> + : only relevant if + <link linkend="br">buddy replication</link> + is used. General + buddy replication configuration options. Must include a: + </listitem> + + <listitem> + <literal>BuddyLocatorConfig</literal> + : implementation-specific + configuration object for the + <literal>BuddyLocator</literal> + implementation + being used. What configuration elements are exposed depends on + the needs of the + <literal>BuddyLocator</literal> + implementation. + </listitem> + + <listitem> + <literal>EvictionConfig</literal> + : only relevant if + <link linkend="eviction_policies">eviction</link> + is used. General + eviction configuration options. Must include at least one: + </listitem> + + <listitem> + <literal>EvictionRegionConfig</literal> + : one for each + eviction region; names the region, etc. Must include a: + </listitem> + + <listitem> + <literal>EvictionAlgorithmConfig</literal> + : implementation-specific + configuration object for the + <literal>EvictionAlgorithm</literal> + implementation + being used. What configuration elements are exposed depends on + the needs of the + <literal>EvictionAlgorithm</literal> + implementation. + </listitem> + + <listitem> + <literal>CacheLoaderConfig</literal> + : only relevant if a + <link linkend="cache_loaders">cache loader</link> + is used. General + cache loader configuration options. Must include at least one: + </listitem> + + <listitem> + <literal>IndividualCacheLoaderConfig</literal> + : implementation-specific + configuration object for the + <literal>CacheLoader</literal> + implementation + being used. What configuration elements are exposed depends on + the needs of the + <literal>CacheLoader</literal> + implementation. + </listitem> + + <listitem> + <literal>RuntimeConfig</literal> + : exposes to cache clients + certain information about the cache's runtime environment (e.g. membership + in buddy replication groups if + <link linkend="br">buddy replication</link> + is used.) Also allows + direct injection into the cache of needed external services like a + JTA + <literal>TransactionManager</literal> + or a JGroups + <literal>ChannelFactory</literal> + . + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>Dynamic Reconfiguration</title> + <para> + Dynamically changing the configuration of + <emphasis>some</emphasis> + options while the cache is running is supported, + by programmatically obtaining the + <literal>Configuration</literal> + object from the running cache and changing values. E.g., + </para> + <programlisting role="JAVA"><![CDATA[ + Configuration liveConfig = cache.getConfiguration(); + liveConfig.setLockAcquisitionTimeout(2000); + ]]></programlisting> + <para> + A complete listing of which options may be changed dynamically is in the + <link linkend="configuration_reference">configuration reference</link> + section. An + <literal>org.jboss.cache.config.ConfigurationException</literal> + will be thrown if you attempt to change a + setting that is not dynamic. + </para> + + <section id="configuration.options"> + <title>Overriding the Configuration via the Option API</title> + <para> + The Option API allows you to override certain behaviours of the cache on a per invocation basis. + This involves creating an instance of + <literal>org.jboss.cache.config.Option</literal> + , setting the options + you wish to override on the + <literal>Option</literal> + object and passing it in the + <literal>InvocationContext</literal> + before invoking your method on the cache. + </para> + <para> + E.g., to force a write lock when reading data (when used in a transaction, this provides semantics + similar to SELECT FOR UPDATE in a database) + </para> + <programlisting role="JAVA"><![CDATA[ + // first start a transaction + cache.getInvocationContext().getOptionOverrides().setForceWriteLock(true); + Node n = cache.getNode(Fqn.fromString("/a/b/c")); + // make changes to the node + // commit transaction + ]]></programlisting> + + <para> + E.g., to suppress replication of a put call in a REPL_SYNC cache: + </para> + <programlisting role="JAVA"><![CDATA[ + Node node = cache.getChild(Fqn.fromString("/a/b/c")); + cache.getInvocationContext().getOptionOverrides().setLocalOnly(true); + node.put("localCounter", new Integer(2)); + ]]></programlisting> + <para> + See the javadocs on the + <literal>Option</literal> + class for details on the options available. + </para> + </section> + </section> +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration_reference.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration_reference.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/configuration_reference.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,3403 @@ +<chapter id="configuration_reference_chapter"> + <title>Configuration References</title> + <section id="sample_xml_file"> + <title>Sample XML Configuration File</title> + <para> + This is what a typical XML configuration file looks like. It is recommended that you use one of the + configurations shipped with the JBoss Cache distribution and tweak according to your needs rather than write + one from scratch. + </para> + <programlisting role="XML"><![CDATA[ +<?xml version="1.0" encoding="UTF-8"?> + +<jbosscache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:jboss:jbosscache-core:config:3.1"> + + +  + <locking + isolationLevel="REPEATABLE_READ" + lockParentForChildInsertRemove="false" + lockAcquisitionTimeout="20000" + nodeLockingScheme="mvcc" + writeSkewCheck="false" + useLockStriping="true" + concurrencyLevel="500"/> + +  + <transaction + transactionManagerLookupClass="org.jboss.cache.transaction.GenericTransactionManagerLookup" + syncRollbackPhase="false" + syncCommitPhase="false"/> + +  + <jmxStatistics + enabled="false"/> + +  + <startup + regionsInactiveOnStartup="true"/> + +  + <shutdown + hookBehavior="DEFAULT"/> + +  + <listeners + asyncPoolSize="1" + asyncQueueSize="100000"/> + +  + <invocationBatching + enabled="false"/> + +  + <serialization + objectInputStreamPoolSize="12" + objectOutputStreamPoolSize="14" + version="3.0.0" + marshallerClass="org.jboss.cache.marshall.VersionAwareMarshaller" + useLazyDeserialization="false" + useRegionBasedMarshalling="false"/> + +  + <clustering mode="replication" clusterName="JBossCache-cluster"> + +  + <stateRetrieval timeout="20000" fetchInMemoryState="false"/> + +  + <sync replTimeout="20000"/> +  +  + +  +  + +  + <jgroupsConfig configFile="udp.xml"> +  + </jgroupsConfig> + </clustering> + +  + <eviction wakeUpInterval="500"> + <default algorithmClass="org.jboss.cache.eviction.LRUAlgorithm" eventQueueSize="200000"> + <property name="maxNodes" value="5000" /> + <property name="timeToLive" value="1000" /> + </default> + <region name="/org/jboss/data1"> + <property name="timeToLive" value="2000" /> + </region> + <region name="/org/jboss/data2" algorithmClass="org.jboss.cache.eviction.FIFOAlgorithm" eventQueueSize="100000"> + <property name="maxNodes" value="3000" /> + <property name="minTimeToLive" value="4000" /> + </region> + </eviction> + +  + <loaders passivation="false" shared="false"> + <preload> + <node fqn="/org/jboss"/> + <node fqn="/org/tempdata"/> + </preload> + +  + <loader class="org.jboss.cache.loader.JDBCCacheLoader" async="true" fetchPersistentState="true" + ignoreModifications="true" purgeOnStartup="true"> + <properties> + cache.jdbc.table.name=jbosscache + cache.jdbc.table.create=true + cache.jdbc.table.drop=true + </properties> + <singletonStore enabled="true" class="org.jboss.cache.loader.SingletonStoreCacheLoader"> + <properties> + pushStateWhenCoordinator=true + pushStateWhenCoordinatorTimeout=20000 + </properties> + </singletonStore> + </loader> + </loaders> + +  +  +</jbosscache> + + +]]></programlisting> + <section> + <title>XML validation</title> + <para> + Configuration XML files are validated using an XSD schema. This schema is included in + <literal>jbosscache-core.jar</literal> and is also available online: <literal>http://www.jboss.org/jbosscache/jbosscache-config-3.0.xsd</literal>. + Most IDEs and XML authoring tools will be able to use this schema to validate your configuration file as you + write it. + </para> + <para> + JBoss Cache also validates your configuration file when you start up, and will throw an exception if it + encounters an invalid file. You can suppress this behavior by passing in <literal>-Djbosscache.config.validate=false</literal> + to your JVM when you start up. Alternatively, you can point the validator to a different schema by + passing in <literal>-Djbosscache.config.schemaLocation=url</literal>. + </para> + </section> + </section> + + + <section id="configuration_reference"> + <title> + Configuration File Quick Reference + </title> + <para>A list of definitions of each of the XML elements attributes used above, and their bean counterparts for + programmatic configuration. If the description of an attribute states that it is <emphasis>dynamic</emphasis>, + that means it can be changed after the cache is created and started. + </para> + + <table id="element.jbosscache"> + <title>The <literal><![CDATA[<jbosscache />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<jbosscache />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This is the root element for the JBoss Cache configuration file. This is the only mandatory + element in a valid JBoss Cache configuration file. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para>none (is root element)</para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link>, + <link linkend="element.customInterceptors"><literal><![CDATA[<customInterceptors />]]></literal></link>, + <link linkend="element.eviction"><literal><![CDATA[<eviction />]]></literal></link>, + <link linkend="element.invocationBatching"><literal><![CDATA[<invocationBatching />]]></literal></link>, + <link linkend="element.jmxStatistics"><literal><![CDATA[<jmxStatistics />]]></literal></link>, + <link linkend="element.listeners"><literal><![CDATA[<listeners />]]></literal></link>, + <link linkend="element.loaders"><literal><![CDATA[<loaders />]]></literal></link>, + <link linkend="element.locking"><literal><![CDATA[<locking />]]></literal></link>, + <link linkend="element.serialization"><literal><![CDATA[<serialization />]]></literal></link>, + <link linkend="element.shutdown"><literal><![CDATA[<shutdown />]]></literal></link>, + <link linkend="element.startup"><literal><![CDATA[<startup />]]></literal></link>, + <link linkend="element.transaction"><literal><![CDATA[<transaction />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean Equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.jbosscache"> + <title><literal><![CDATA[<jbosscache />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<jbosscache />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">xmlns</emphasis></entry> + <entry> - </entry> + <entry>urn:jboss:jbosscache-core:config:3.1</entry> + <entry>urn:jboss:jbosscache-core:config:3.1</entry> + <entry>Defines the XML namespace for all configuration entries.</entry> + </row> + <row> + <entry><emphasis role="bold">xmlns:xsi</emphasis></entry> + <entry> - </entry> + <entry>http://www.w3.org/2001/XMLSchema-instance</entry> + <entry>http://www.w3.org/2001/XMLSchema-instance</entry> + <entry>Defines the XML schema instance for the configuration.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.locking"> + <title>The <literal><![CDATA[<locking />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<locking />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies locking behavior on the cache. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.locking"> + <title><literal><![CDATA[<locking />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<locking />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">isolationLevel</emphasis></entry> + <entry>isolationLevel</entry> + <entry>READ_COMMITTED, REPEATABLE_READ</entry> + <entry>REPEATABLE_READ</entry> + + <entry>The isolation level used for transactions.</entry> + </row> + <row> + <entry><emphasis role="bold">lockParentForChildInsertRemove</emphasis></entry> + <entry>lockParentForChildInsertRemove</entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry>Specifies whether parent nodes are locked when inserting or removing children. This + can also be configured on a per-node basis (see <literal>Node.setLockForChildInsertRemove()</literal></entry> + </row> + <row> + <entry><emphasis role="bold">lockAcquisitionTimeout</emphasis></entry> + <entry>lockAcquisitionTimeout + (<emphasis>dynamic</emphasis>)</entry> + <entry>Any positive long value</entry> + <entry>10000</entry> + + <entry>Length of time, in milliseconds, that a thread will try and acquire a lock. A <literal>TimeoutException</literal> + is usually thrown if a lock cannot be acquired in this given timeframe. Can be overridden + on a per-invocation basis using <literal>Option.setLockAcquisitionTimeout()</literal></entry> + </row> + <row> + <entry><emphasis role="bold">nodeLockingScheme</emphasis> + (<emphasis>deprecated</emphasis>)</entry> + <entry>nodeLockingScheme</entry> + <entry>mvcc, pessimistic, optimistic</entry> + <entry>mvcc</entry> + + <entry>Specifies the node locking scheme to be used.</entry> + </row> + <row> + <entry><emphasis role="bold">writeSkewCheck</emphasis></entry> + <entry>writeSkewCheck</entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry>Specifies whether to check for write skews. Only used if <literal>nodeLockingScheme</literal> + is <literal>mvcc</literal> and <literal>isolationLevel</literal> is <literal>REPEATABLE_READ</literal>. + See the <link linkend="mvcc.writeskew">section on write skews</link> for a more detailed discussion.</entry> + </row> + <row> + <entry><emphasis role="bold">useLockStriping</emphasis></entry> + <entry>useLockStriping</entry> + <entry>true, false</entry> + <entry>true</entry> + + <entry>Specifies whether lock striping is used. Only used if <literal>nodeLockingScheme</literal> + is <literal>mvcc</literal>. Lock striping usually offers greater performance and better memory usage, + although in certain cases deadlocks may occur where several Fqns map to the same shared lock. This + can be mitigated by increasing your concurrency level, though the only concrete solution is to + disable lock striping altogether. + </entry> + </row> + <row> + <entry><emphasis role="bold">concurrencyLevel</emphasis></entry> + <entry>concurrencyLevel</entry> + <entry>Any positive integer; 0 not allowed.</entry> + <entry>500</entry> + + <entry>Specifies the number of shared locks to use for write locks acquired. Only used if <literal>nodeLockingScheme</literal> + is <literal>mvcc</literal>. + See the <link linkend="mvcc.impl">section on JBoss Cache's MVCC implementation</link> for a more detailed discussion.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.transaction"> + <title>The <literal><![CDATA[<transaction />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<transaction />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies transactional behavior on the cache. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.transaction"> + <title><literal><![CDATA[<transaction />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<transaction />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">transactionManagerLookupClass</emphasis></entry> + <entry>transactionManagerLookupClass</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>none</entry> + + <entry>Specifies the <literal>TransactionManagerLookupClass</literal> implementation to use to obtain + a transaction manager. If not specified (and a <literal>TransactionManager</literal> is not injected + using <literal>RuntimeConfig.setTransactionManager()</literal>, the cache will not be able to participate + in any transactions.</entry> + </row> + <row> + <entry><emphasis role="bold">syncCommitPhase</emphasis></entry> + <entry>syncCommitPhase + (<emphasis>dynamic</emphasis>) + </entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry>If enabled, commit messages that are broadcast around a cluster are done so synchronously. This is + usually of little value since detecting a failure in broadcasting a commit means little else can be done + except log a message, since some nodes in a cluster may have already committed and cannot rollback.</entry> + </row> + <row> + <entry><emphasis role="bold">syncRollbackPhase</emphasis></entry> + <entry>syncRollbackPhase + (<emphasis>dynamic</emphasis>) + </entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry>If enabled, rollback messages that are broadcast around a cluster are done so synchronously. This is + usually of little value since detecting a failure in broadcasting a rollback means little else can be done + except log a message, since some nodes in a cluster may have already committed and cannot rollback.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.jmxStatistics"> + <title>The <literal><![CDATA[<jmxStatistics />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<jmxStatistics />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies whether cache statistics are gathered and reported via JMX. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.jmxStatistics"> + <title><literal><![CDATA[<jmxStatistics />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<jmxStatistics />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">enabled</emphasis></entry> + <entry>exposeManagementStatistics</entry> + <entry>true, false</entry> + <entry>true</entry> + + <entry>Controls whether cache statistics are gathered and exposed via JMX.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.startup"> + <title>The <literal><![CDATA[<startup />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<startup />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies behavior when the cache starts up. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.startup"> + <title><literal><![CDATA[<startup />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<startup />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">regionsInactiveOnStartup</emphasis></entry> + <entry>inactiveOnStartup</entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry>If <link linkend="architecture.regions">region-based marshalling</link> is enabled, this + attribute controls whether new regions created are inactive on startup.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.shutdown"> + <title>The <literal><![CDATA[<shutdown />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<shutdown />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies behavior when the cache shuts down. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.shutdown"> + <title><literal><![CDATA[<shutdown />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<shutdown />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">hookBehavior</emphasis></entry> + <entry>shutdownHookBehavior</entry> + <entry>DEFAULT, DONT_REGISTER, REGISTER</entry> + <entry>DEFAULT</entry> + + <entry> + This attribute determines whether the cache registers a JVM shutdown hook so that it can clean + up resources if the JVM is receives a shutdown signal. By default a shutdown hook is registered + if no MBean server (apart from the JDK default) is detected. REGSTER forces the cache to register + a shutdown hook even if an MBean server is detected, and DONT_REGISTER forces the cache NOT to + register a shutdown hook, even if no MBean server is detected. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.listeners"> + <title>The <literal><![CDATA[<listeners />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<listeners />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies behavior of registered cache listeners. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.listeners"> + <title><literal><![CDATA[<listeners />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<listeners />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">asyncPoolSize</emphasis></entry> + <entry>listenerAsyncPoolSize</entry> + <entry>integer</entry> + <entry>1</entry> + + <entry> + The size of the threadpool used to dispatch events to cache listeners that have registered as + asynchronous listeners. If this number is less than 1, all asynchronous listeners will be + treated as synchronous listeners and notified synchronously. + </entry> + </row> + + <row> + <entry><emphasis role="bold">asyncQueueSize</emphasis></entry> + <entry>listenerAsyncQueueSize</entry> + <entry>positive integer</entry> + <entry>50000</entry> + + <entry> + The size of the bounded queue used by the async listener threadpool. Only considered if + <literal>asyncPoolSize</literal> is greater than 0. Increase this if you see a lot of threads + blocking trying to add events to this queue. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.invocationBatching"> + <title>The <literal><![CDATA[<invocationBatching />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<invocationBatching />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies behavior of invocation batching. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.invocationBatching"> + <title><literal><![CDATA[<invocationBatching />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<invocationBatching />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">enabled</emphasis></entry> + <entry>invocationBatchingEnabled</entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry> + Whether invocation batching is enabled or not. See the chapter on + <link linkend="batching">invocation batching</link> for details. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.serialization"> + <title>The <literal><![CDATA[<serialization />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<serialization />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element specifies behavior of object serialization in JBoss Cache. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>Configuration</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.serialization"> + <title><literal><![CDATA[<serialization />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<serialization />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">marshallerClass</emphasis></entry> + <entry>marshallerClass</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>VersionAwareMarshaller</entry> + + <entry> + Specifies the marshaller to use when serializing and deserializing objects, either for replication + or persistence. + </entry> + </row> + <row> + <entry><emphasis role="bold">useLazyDeserialization</emphasis></entry> + <entry>useLazyDeserialization</entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry> + A mechanism by which serialization and deserialization of objects is deferred till the point in time + in which they are used and needed. This typically means that any deserialization happens using the + thread context class loader of the invocation that requires deserialization, and is an effective + mechanism to provide classloader isolation. + </entry> + </row> + <row> + <entry><emphasis role="bold">useRegionBasedMarshalling</emphasis> (<emphasis>deprecated</emphasis>)</entry> + <entry>useRegionBasedMarshalling</entry> + <entry>true, false</entry> + <entry>false</entry> + + <entry> + An older mechanism by which classloader isolation was achieved, by registering classloaders on + specific regions. + </entry> + </row> + <row> + <entry><emphasis role="bold">version</emphasis></entry> + <entry>replicationVersion</entry> + <entry>Valid JBoss Cache version string</entry> + <entry>Current version</entry> + + <entry> + Used by the <literal>VersionAwareMarshaller</literal> in determining which version stream parser + to use by default when initiating communications in a cluster. Useful when you need to run a newer + version of JBoss Cache in a cluster containing older versions, and can be used to perform rolling + upgrades. + </entry> + </row> + <row> + <entry><emphasis role="bold">objectInputStreamPoolSize</emphasis></entry> + <entry>objectInputStreamPoolSize</entry> + <entry>Positive integer</entry> + <entry>50</entry> + + <entry> + Not used at the moment. + </entry> + </row> + <row> + <entry><emphasis role="bold">objectOutputStreamPoolSize</emphasis></entry> + <entry>objectOutputStreamPoolSize</entry> + <entry>Positive integer</entry> + <entry>50</entry> + + <entry> + Not used at the moment. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.eviction"> + <title>The <literal><![CDATA[<eviction />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<eviction />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element controls how eviction works in the cache. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.default"><literal><![CDATA[<default />]]></literal></link>, + <link linkend="element.region"><literal><![CDATA[<region />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>EvictionConfig</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.eviction"> + <title><literal><![CDATA[<eviction />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<eviction />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">wakeUpInterval</emphasis></entry> + <entry>wakeupInterval</entry> + <entry>integer</entry> + <entry>5000</entry> + + <entry> + The frequency with which the eviction thread runs, in milliseconds. If set to less than 1, the + eviction thread never runs and is effectively disabled. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.default"> + <title>The <literal><![CDATA[<default />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<default />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element defines the default eviction region. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.eviction"><literal><![CDATA[<eviction />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.property"><literal><![CDATA[<property />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>EvictionRegionConfig</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.default"> + <title><literal><![CDATA[<default />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<default />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">algorithmClass</emphasis></entry> + <entry>evictionAlgorithmConfig</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>none</entry> + <entry> + This attribute needs to be specified if this tag is being used. Note that if being configured + programmatically, the eviction algorithm's corresponding <literal>EvictionAlgorithmConfig</literal> + file should be used instead. E.g., where you would use <literal>LRUAlgorithm</literal> in XML, you + would use an instance of <literal>LRUAlgorithmConfig</literal> programmatically. + </entry> + </row> + <row> + <entry><emphasis role="bold">actionPolicyClass</emphasis></entry> + <entry>evictionActionPolicyClassName</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>DefaultEvictionActionPolicy</entry> + <entry> + The eviction action policy class, defining what happens when a node needs to be evicted. + </entry> + </row> + <row> + <entry><emphasis role="bold">eventQueueSize</emphasis></entry> + <entry>eventQueueSize + (<emphasis>dynamic</emphasis></entry> + <entry>integer</entry> + <entry>200000</entry> + <entry> + The size of the bounded eviction event queue. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.region"> + <title>The <literal><![CDATA[<region />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<region />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element defines an eviction region. Multiple instances of this tag can exist provided they + have unique <literal>name</literal> attributes. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para><link linkend="element.eviction"><literal><![CDATA[<eviction />]]></literal></link></para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.property"><literal><![CDATA[<property />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para><literal>EvictionRegionConfig</literal></para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.region"> + <title><literal><![CDATA[<region />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<region />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">name</emphasis></entry> + <entry>regionFqn</entry> + <entry>A String that could be parsed using Fqn.fromString()</entry> + <entry>none</entry> + <entry> + This should be a unique name that defines this region. See the <link linkend="regions">chapter on eviction</link> + for details of eviction regions. + </entry> + </row> + <row> + <entry><emphasis role="bold">algorithmClass</emphasis></entry> + <entry>evictionAlgorithmConfig</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>none</entry> + <entry> + This attribute needs to be specified if this tag is being used. Note that if being configured + programmatically, the eviction algorithm's corresponding <literal>EvictionAlgorithmConfig</literal> + file should be used instead. E.g., where you would use <literal>LRUAlgorithm</literal> in XML, you + would use an instance of <literal>LRUAlgorithmConfig</literal> programmatically. + </entry> + </row> + <row> + <entry><emphasis role="bold">actionPolicyClass</emphasis></entry> + <entry>evictionActionPolicyClassName</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>DefaultEvictionActionPolicy</entry> + <entry> + The eviction action policy class, defining what happens when a node needs to be evicted. + </entry> + </row> + <row> + <entry><emphasis role="bold">eventQueueSize</emphasis></entry> + <entry>eventQueueSize + (<emphasis>dynamic</emphasis></entry> + <entry>integer</entry> + <entry>200000</entry> + <entry> + The size of the bounded eviction event queue. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.property"> + <title>The <literal><![CDATA[<property />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<property />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + A mechanism of passing in name-value properties to the enclosing configuration element. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.default"><literal><![CDATA[<default />]]></literal></link>, + <link linkend="element.region"><literal><![CDATA[<region />]]></literal></link>, + <link linkend="element.interceptor"><literal><![CDATA[<interceptor />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry></entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>Either direct setters or <literal>setProperties()</literal> enclosing bean</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.property"> + <title><literal><![CDATA[<property />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<property />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">name</emphasis></entry> + <entry>Either direct setters or <literal>setProperties()</literal> enclosing bean</entry> + <entry>String</entry> + <entry>none</entry> + <entry> + Property name + </entry> + </row> + <row> + <entry><emphasis role="bold">value</emphasis></entry> + <entry>Either direct setters or <literal>setProperties()</literal> enclosing bean</entry> + <entry>String</entry> + <entry>none</entry> + <entry> + Property value + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.loaders"> + <title>The <literal><![CDATA[<loaders />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<loaders />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + Defines any cache loaders. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.preload"><literal><![CDATA[<preload />]]></literal></link>, + <link linkend="element.loader"><literal><![CDATA[<loader />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>CacheLoaderConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.loaders"> + <title><literal><![CDATA[<loaders />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<loaders />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">passivation</emphasis></entry> + <entry>passivation</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + If true, cache loaders are used in passivation mode. See the <link linkend="cache_loaders">chapter on cache loaders</link> + for a detailed discussion on this. + </entry> + </row> + <row> + <entry><emphasis role="bold">shared</emphasis></entry> + <entry>shared</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + If true, cache loaders are used in shared mode. See the <link linkend="cache_loaders">chapter on cache loaders</link> + for a detailed discussion on this. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.preload"> + <title>The <literal><![CDATA[<preload />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<preload />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + Defines preloading of Fqn subtrees when a cache starts up. This element has no attributes. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.loaders"><literal><![CDATA[<loaders />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.node"><literal><![CDATA[<node />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>CacheLoaderConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.node"> + <title>The <literal><![CDATA[<node />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<node />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element defines a subtree under which all content will be preloaded from the cache loaders + when the cache starts. Multiple subtrees can be preloaded, although it only makes sense to + define more than one subtree if they do not overlap. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.preload"><literal><![CDATA[<preload />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry></entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>CacheLoaderConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.node"> + <title><literal><![CDATA[<node />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<node />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">fqn</emphasis></entry> + <entry>preload</entry> + <entry>String</entry> + <entry>none</entry> + <entry> + An Fqn to preload. This should be a String that can be parsed with Fqn.fromString(). When doing + this programmatically, you should create a single String containing all of the Fqns you wish to + preload, separated by spaces, and pass that into <literal>CacheLoaderConfig.setPreload()</literal>. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.loader"> + <title>The <literal><![CDATA[<loader />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<loader />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element defines a cache loader. Multiple elements may be used to create cache loader + chains. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.loaders"><literal><![CDATA[<loaders />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.properties"><literal><![CDATA[<properties />]]></literal></link>, + <link linkend="element.singletonStore"><literal><![CDATA[<singletonStore />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>IndividualCacheLoaderConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.loader"> + <title><literal><![CDATA[<loader />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<loader />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">class</emphasis></entry> + <entry>className</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>none</entry> + <entry> + A cache loader implementation to use. + </entry> + </row> + + <row> + <entry><emphasis role="bold">async</emphasis></entry> + <entry>async</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + All modifications to this cache loader happen asynchronously, on a separate thread. + </entry> + </row> + + <row> + <entry><emphasis role="bold">fetchPersistentState</emphasis></entry> + <entry>fetchPersistentState</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + When a cache starts up, retrieve persistent state from the cache loaders in other caches in the + cluster. Only <emphasis>one</emphasis> loader element may set this to true. Also, only makes + sense if the <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link> + tag is present. + + </entry> + </row> + + <row> + <entry><emphasis role="bold">purgeOnStartup</emphasis></entry> + <entry>purgeOnStartup</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + Purges this cache loader when it starts up. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.properties"> + <title>The <literal><![CDATA[<properties />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<properties />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element contains a set of properties that can be read by a <literal>java.util.Properties</literal> + instance. This tag has no attributes, and the contents of this tag will be parsed by + <literal>Properties.load()</literal>. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.loader"><literal><![CDATA[<loader />]]></literal></link>, + <link linkend="element.singletonStore"><literal><![CDATA[<singletonStore />]]></literal></link>, + <link linkend="element.locator"><literal><![CDATA[<locator />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry></entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>IndividualCacheLoaderConfig.setProperties()</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.singletonStore"> + <title>The <literal><![CDATA[<singletonStore />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<singletonStore />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element configures the enclosing cache loader as a <link linkend="sscl">singleton store cache loader</link>. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.loader"><literal><![CDATA[<loader />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.properties"><literal><![CDATA[<properties />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>SingletonStoreConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.singletonStore"> + <title><literal><![CDATA[<singletonStore />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<singletonStore />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">class</emphasis></entry> + <entry>className</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>SingletonStoreCacheLoader</entry> + <entry> + A singleton store wrapper implementation to use. + </entry> + </row> + + <row> + <entry><emphasis role="bold">enabled</emphasis></entry> + <entry>enabled</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + If true, the singleton store cache loader is enabled. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.customInterceptors"> + <title>The <literal><![CDATA[<customInterceptors />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<customInterceptors />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element allows you to define custom interceptors for the cache. This tag has no attributes. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.interceptor"><literal><![CDATA[<interceptor />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>None. At runtime, instantiate your own interceptor and pass it in to the cache using + <literal>Cache.addInterceptor()</literal>.</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.interceptor"> + <title>The <literal><![CDATA[<interceptor />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<interceptor />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This element allows you configure a custom interceptor. This tag may appear multiple times. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.customInterceptor"><literal><![CDATA[<customInterceptor />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.property"><literal><![CDATA[<property />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>None. At runtime, instantiate your own interceptor and pass it in to the cache using + <literal>Cache.addInterceptor()</literal>.</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.interceptor"> + <title><literal><![CDATA[<interceptor />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<interceptor />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">class</emphasis></entry> + <entry> - </entry> + <entry>A valid class that is available on the classpath</entry> + <entry>none</entry> + <entry> + An implementation of <literal>CommandInterceptor</literal>. + </entry> + </row> + + <row> + <entry><emphasis role="bold">position</emphasis></entry> + <entry> - </entry> + <entry>first, last</entry> + <entry></entry> + <entry> + A position at which to place this interceptor in the chain. First is the first interceptor + encountered when an invocation is made on the cache, last is the last interceptor before the + call is passed on to the data structure. <emphasis>Note that this attribute is mutually + exclusive with <literal>before</literal>, <literal>after</literal> and <literal>index</literal>.</emphasis> + </entry> + </row> + + <row> + <entry><emphasis role="bold">before</emphasis></entry> + <entry> - </entry> + <entry>Fully qualified class name of an interceptor</entry> + <entry></entry> + <entry> + Will place the new interceptor directly before the instance of the named interceptor. + <emphasis>Note that this attribute is mutually exclusive with <literal>position</literal>, + <literal>after</literal> and <literal>index</literal>.</emphasis> + </entry> + </row> + + <row> + <entry><emphasis role="bold">after</emphasis></entry> + <entry> - </entry> + <entry>Fully qualified class name of an interceptor</entry> + <entry></entry> + <entry> + Will place the new interceptor directly after the instance of the named interceptor. + <emphasis>Note that this attribute is mutually exclusive with <literal>position</literal>, + <literal>before</literal> and <literal>index</literal>.</emphasis> + </entry> + </row> + <row> + <entry><emphasis role="bold">index</emphasis></entry> + <entry> - </entry> + <entry>Positive integers</entry> + <entry></entry> + <entry> + A position at which to place this interceptor in the chain, with 0 being the first position. + <emphasis>Note that this attribute is mutually exclusive with <literal>position</literal>, + <literal>before</literal> and <literal>after</literal>.</emphasis> + </entry> + </row> + + </tbody> + </tgroup> + </table> + + <table id="element.clustering"> + <title>The <literal><![CDATA[<clustering />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<clustering />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + If this element is present, the cache is started in clustered mode. Attributes and child + elements define clustering characteristics. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.jbosscache"><literal><![CDATA[<jbosscache />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.stateRetrieval"><literal><![CDATA[<stateRetrieval />]]></literal></link>, + <link linkend="element.sync"><literal><![CDATA[<sync />]]></literal></link>, + <link linkend="element.async"><literal><![CDATA[<async />]]></literal></link>, + <link linkend="element.buddy"><literal><![CDATA[<buddy />]]></literal></link>, + <link linkend="element.jgroupsConfig"><literal><![CDATA[<jgroupsConfig />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>Configuration</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.clustering"> + <title><literal><![CDATA[<clustering />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<clustering />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">mode</emphasis></entry> + <entry>cacheMode</entry> + <entry>replication, invalidation, r, i</entry> + <entry>replication</entry> + <entry> + See the <link linkend="clustering">chapter on clustering</link> for the differences between + replication and invalidation. When using the bean, synchronous and asynchronous communication is + combined with clustering mode to give you the enumberation <literal>Configuration.CacheMode</literal>. + </entry> + </row> + + <row> + <entry><emphasis role="bold">clusterName</emphasis></entry> + <entry>clusterName</entry> + <entry>String</entry> + <entry>JBossCache-cluster</entry> + <entry> + A cluster name which is used to identify the cluster to join. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.sync"> + <title>The <literal><![CDATA[<sync />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<sync />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + If this element is present, all communications are synchronous, in that whenever a thread sends + a message sent over the wire, it blocks until it receives an acknowledgement from the recipient. + This element is mutually exclusive with the <link linkend="element.async"><literal><![CDATA[<async />]]></literal></link> + element. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>Configuration.setCacheMode()</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.sync"> + <title><literal><![CDATA[<sync />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<sync />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">replTimeout</emphasis></entry> + <entry>syncReplTimeout (<emphasis>dynamic</emphasis>)</entry> + <entry>positive integer</entry> + <entry>15000</entry> + <entry> + This is the timeout used to wait for an acknowledgement when making a remote call, after which + an exception is thrown. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.async"> + <title>The <literal><![CDATA[<async />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<async />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + If this element is present, all communications are asynchronous, in that whenever a thread sends + a message sent over the wire, it does not wait for an acknowledgement before returning. + This element is mutually exclusive with the <link linkend="element.sync"><literal><![CDATA[<sync />]]></literal></link> + element. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>Configuration.setCacheMode()</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.async"> + <title><literal><![CDATA[<async />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<async />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">serializationExecutorPoolSize</emphasis></entry> + <entry>serializationExecutorPoolSize</entry> + <entry>positive integer</entry> + <entry>25</entry> + <entry> + In addition to replication happening asynchronously, even serialization of contents for replication + happens in a separate thread to allow the caller to return as quickly as possible. This setting + controls the size of the serializer thread pool. Setting this to any value less than 1 means + serialization does not happen asynchronously. + </entry> + </row> + <row> + <entry><emphasis role="bold">serializationExecutorQueueSize</emphasis></entry> + <entry>serializationExecutorQueueSize</entry> + <entry>positive integer</entry> + <entry>50000</entry> + <entry> + This is used to define the size of the bounded queue that holds tasks for the serialization executor. + This is ignored if a serialization executor is not used, such as when <literal>serializationExecutorPoolSize</literal> + is less than 1. + </entry> + </row> + <row> + <entry><emphasis role="bold">useReplQueue</emphasis></entry> + <entry>useReplQueue</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + If true, this forces all async communications to be queued up and sent out periodically as a batch. + </entry> + </row> + <row> + <entry><emphasis role="bold">replQueueInterval</emphasis></entry> + <entry>replQueueInterval</entry> + <entry>positive integer</entry> + <entry>5000</entry> + <entry> + If <literal>useReplQueue</literal> is set to true, this attribute controls how often the asynchronous + thread used to flush the replication queue runs. This should be a positive integer which represents + thread wakeup time in milliseconds. + </entry> + </row> + <row> + <entry><emphasis role="bold">replQueueMaxElements</emphasis></entry> + <entry>replQueueMaxElements</entry> + <entry>positive integer</entry> + <entry>1000</entry> + <entry> + If <literal>useReplQueue</literal> is set to true, this attribute can be used to trigger flushing + of the queue when it reaches a specific threshold. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.stateRetrieval"> + <title>The <literal><![CDATA[<stateRetrieval />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<stateRetrieval />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This tag controls ho state is retrieved from neighboring caches when this cache instance starts. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>Configuration</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.stateRetrieval"> + <title><literal><![CDATA[<stateRetrieval />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<stateRetrieval />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">fetchInMemoryState</emphasis></entry> + <entry>fetchInMemoryState</entry> + <entry>true, false</entry> + <entry>true</entry> + <entry> + If true, this will cause the cache to ask neighboring caches for state when it starts up, so the + cache starts "warm". + </entry> + </row> + <row> + <entry><emphasis role="bold">timeout</emphasis></entry> + <entry>stateRetrievalTimeout</entry> + <entry>positive integer</entry> + <entry>10000</entry> + <entry> + This is the maximum amount of time - in milliseconds - to wait for state from neighboring caches, + before throwing an exception and aborting startup. + </entry> + </row> + <row> + <entry><emphasis role="bold">nonBlocking</emphasis></entry> + <entry>useNonBlockingStateTransfer</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + This configuration switch enables the Non-Blocking State Transfer mechanism, new in 3.1.0. Note that + this requires MVCC as a node locking scheme, and that STREAMING_STATE_TRANSFER is present in the + JGroups stack used. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.buddy"> + <title>The <literal><![CDATA[<buddy />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<buddy />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + If this tag is present, then state is not replicated across the entire cluster. Instead, buddy + replication is used to select cache instances to maintain backups on. See + <link linkend="br">this section on buddy replication</link> for details. Note that this is only + used if the clustering mode is <literal>replication</literal>, and not if it is <literal>invalidation</literal>. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.dataGravitation"><literal><![CDATA[<dataGravitation />]]></literal></link>, + <link linkend="element.locator"><literal><![CDATA[<locator />]]></literal></link>, + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>BuddyReplicationConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.buddy"> + <title><literal><![CDATA[<buddy />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<buddy />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">enabled</emphasis></entry> + <entry>enabled</entry> + <entry>true, false</entry> + <entry>false</entry> + <entry> + If true, buddy replication is enabled. + </entry> + </row> + <row> + <entry><emphasis role="bold">communicationTimeout</emphasis></entry> + <entry>buddyCommunicationTimeout</entry> + <entry>positive integer</entry> + <entry>10000</entry> + <entry> + This is the maximum amount of time - in milliseconds - to wait for buddy group organization + communications from buddy caches. + </entry> + </row> + <row> + <entry><emphasis role="bold">poolName</emphasis></entry> + <entry>buddyPoolName</entry> + <entry>String</entry> + <entry></entry> + <entry> + This is used as a means to identify cache instances and provide hints to the buddy selection + algorithms. More information on <link linkend="br">the section on buddy replication</link>. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.dataGravitation"> + <title>The <literal><![CDATA[<dataGravitation />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<dataGravitation />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This tag configures how data gravitation is conducted. See + <link linkend="br">this section on buddy replication</link> for details. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.buddy"><literal><![CDATA[<buddy />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>BuddyReplicationConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.dataGravitation"> + <title><literal><![CDATA[<dataGravitation />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<dataGravitation />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">auto</emphasis></entry> + <entry>autoDataGravitation</entry> + <entry>true, false</entry> + <entry>true</entry> + <entry> + If true, when a get() is performed on a cache and nothing is found, a gravitation from neighboring + caches is attempted. If this is false, then gravitations can only occur if the + <literal>Option.setForceDataGravitation()</literal> option is provided. + </entry> + </row> + <row> + <entry><emphasis role="bold">removeOnFind</emphasis></entry> + <entry>dataGravitationRemoveOnFind</entry> + <entry>true, false</entry> + <entry>true</entry> + <entry> + If true, when gravitation occurs, the instance that requests the gravitation takes ownership of + the state and requests that all other instances remove the gravitated state from memory. + </entry> + </row> + <row> + <entry><emphasis role="bold">searchBackupTrees</emphasis></entry> + <entry>dataGravitationSearchBackupTrees</entry> + <entry>true, false</entry> + <entry>true</entry> + <entry> + If true, incoming gravitation requests will cause the cache to search not just its primary + data structure but its backup structure as well. + </entry> + </row> + + </tbody> + </tgroup> + </table> + + <table id="element.locator"> + <title>The <literal><![CDATA[<locator />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<locator />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This tag provides a pluggable mechanism for providing buddy location algorithms. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.buddy"><literal><![CDATA[<buddy />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + <link linkend="element.properties"><literal><![CDATA[<properties />]]></literal></link> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>BuddyLocatorConfig</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.locator"> + <title><literal><![CDATA[<locator />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<locator />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">class</emphasis></entry> + <entry>className</entry> + <entry>A valid class that is available on the classpath</entry> + <entry>NextMemberBuddyLocator</entry> + <entry> + A <literal>BuddyLocator</literal> implementation to use when selecting buddies from the cluster. + Please refer to <literal>BuddyLocator</literal> javadocs for details. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="element.jgroupsConfig"> + <title>The <literal><![CDATA[<jgroupsConfig />]]></literal> Element</title> + <tgroup cols="2" align="left"> + <colspec colname="name" /> + <colspec colname="desc" /> + <spanspec spanname="hspan" namest="name" nameend="desc" align="left" /> + + <thead valign="top"> + <row> + <entry spanname="hspan">The <literal><![CDATA[<jgroupsConfig />]]></literal> Element</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry> + <para><emphasis role="bold">Description</emphasis></para> + </entry> + + <entry> + <para> + This tag provides a configuration which is used with JGroups to create a network communication + channel. + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Parent</emphasis></para> + </entry> + + <entry> + <para> + <link linkend="element.clustering"><literal><![CDATA[<clustering />]]></literal></link> + </para> + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Children</emphasis></para> + </entry> + + <entry> + A series of elements representing JGroups protocols (see + <ulink url="http://www.jgroups.org/javagroupsnew/docs/ug.html">JGroups documentation</ulink>). Note + that there are no child elements if any of the element attributes are used instead. See section + on attributes. + </entry> + </row> + + <row> + <entry> + <para><emphasis role="bold">Bean equivalent</emphasis></para> + </entry> + + <entry> + <para>Configuration</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table id="attributes.jgroupsConfig"> + <title><literal><![CDATA[<jgroupsConfig />]]></literal> Attributes</title> + <tgroup cols="5" align="left"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + + <spanspec spanname="hspan" namest="c1" nameend="c5" align="left" /> + <thead valign="top"> + <row><entry spanname="hspan"><literal><![CDATA[<jgroupsConfig />]]></literal> Attributes</entry></row> + <row> + <entry>Attribute</entry> + <entry>Bean Field</entry> + <entry>Allowed</entry> + <entry>Default</entry> + <entry>Description</entry> + </row> + </thead> + + <tbody valign="top"> + <row> + <entry><emphasis role="bold">configFile</emphasis></entry> + <entry>clusterConfig</entry> + <entry>A JGroups configuration file on the classpath</entry> + <entry>udp.xml</entry> + <entry> + If this attribute is used, then any JGroups elements representing protocols within this tag are + ignored. Instead, JGroups settings are read from the file specified. Note that this cannot be used + with the <literal>multiplexerStack</literal> attribute. + </entry> + </row> + <row> + <entry><emphasis role="bold">multiplexerStack</emphasis></entry> + <entry>muxStackName</entry> + <entry>A valid multiplexer stack name that exists in the channel factory passed in to the <literal>RuntimeConfig</literal></entry> + <entry></entry> + <entry> + This can only be used with the <literal>RuntimeConfig</literal>, where you pass in a JGroups + <literal>ChannelFactory</literal> instance using <literal>RuntimeConfig.setMuxChannelFactory()</literal>. + If this attribute is used, then any JGroups elements representing protocols within this tag are + ignored. Instead, the JGroups channel is created using the factory passed in. Note that this cannot be + used with the <literal>configFile</literal> attribute. + </entry> + </row> + </tbody> + </tgroup> + </table> + </section> +</chapter> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/deployment.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/deployment.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/deployment.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,540 @@ +<chapter id="deployment"> + <title>Deploying JBoss Cache</title> + <section id="deployment.standalone"> + <title>Standalone Use/Programatic Deployment</title> + <para> + When used in a standalone Java program, all that needs to be done is to instantiate the cache using the + <literal>CacheFactory</literal> + and a + <literal>Configuration</literal> + instance or an XML file, as discussed + in the + <link linkend="api.create_start">User API</link> + and + <link linkend="configuration.creation">Configuration</link> + chapters. + </para> + + <para> + The same techniques can be used when an application running in an application + server wishes to programatically deploy a cache rather than relying on an application server's + deployment features. An example of this would be + a webapp deploying a cache via a + <literal>javax.servlet.ServletContextListener</literal>. + </para> + + <para> + After creation, you could share your cache instance among different application components either by using an + IOC container such as Spring, JBoss Microcontainer, etc., or by binding it to JNDI, or simply + holding a static reference to the cache. + </para> + + <para> + If, after deploying your cache you wish to expose a management interface + to it in JMX, see the + <link linkend="jmx.registration.programatic">section on Programatic Registration in JMX</link>. + </para> + </section> + <section id="deployment.microcontainer"> + <title>Via JBoss Microcontainer (JBoss AS 5.x)</title> + + <para> + Beginning with AS 5, JBoss AS supports deployment of POJO services via + deployment of a file whose name ends with + <literal>-jboss-beans.xml</literal>. + A POJO service is one whose implementation is via a "Plain Old Java Object", + meaning a simple java bean that isn't required to implement any special + interfaces or extend any particular superclass. A + <literal>Cache</literal> is a POJO service, and all the components in a + <literal>Configuration</literal> + are also POJOs, so deploying a cache in this way is a natural step. + </para> + <para> + Deployment of the cache is done using the JBoss Microcontainer that forms the + core of JBoss AS. JBoss Microcontainer is a sophisticated IOC framework + similar to Spring. A <literal>-jboss-beans.xml</literal> file is basically + a descriptor that tells the IOC framework how to assemble the various + beans that make up a POJO service. + </para> + <para> + For each configurable option exposed by the <literal>Configuration</literal> + components, a getter/setter must be defined in the configuration class. + This is required so that JBoss Microcontainer can, in typical IOC way, + call these methods when the corresponding properties have been + configured. + </para> + <para> + You need to ensure that the <literal>jbosscache-core.jar</literal> and <literal>jgroups.jar</literal> libraries + are in your server's <literal>lib</literal> directory. This is usually the case when you use JBoss AS in its + <literal>all</literal> configuration. Note that you will have to bring in any optional jars you require, such + as <literal>jdbm.jar</literal> based on your cache configuration. + </para> + <para> + The following is an example + <literal>-beans.xml</literal> + file. If you + look in the + <literal>server/all/deploy</literal> + directory of a JBoss AS 5 + installation, you can find several more examples. + </para> + + <programlisting role="XML"><![CDATA[ +<?xml version="1.0" encoding="UTF-8"?> + +<deployment xmlns="urn:jboss:bean-deployer:2.0"> + +  + <bean name="ExampleCacheConfig" + class="org.jboss.cache.config.Configuration"> + +  + <property name="runtimeConfig"> + <bean class="org.jboss.cache.config.RuntimeConfig"> + <property name="transactionManager"> + <inject bean="jboss:service=TransactionManager" + property="TransactionManager"/> + </property> + <property name="muxChannelFactory"><inject bean="JChannelFactory"/></property> + </bean> + </property> + + <property name="multiplexerStack">udp</property> + + <property name="clusterName">Example-EntityCache</property> + + <property name="isolationLevel">REPEATABLE_READ</property> + + <property name="cacheMode">REPL_SYNC</property> + + <property name="stateRetrievalTimeout">15000</property> + + <property name="syncReplTimeout">20000</property> + + <property name="lockAcquisitionTimeout">15000</property> + + <property name="exposeManagementStatistics">true</property> + </bean> + +  + <bean name="DefaultCacheFactory" class="org.jboss.cache.DefaultCacheFactory"> + <constructor factoryClass="org.jboss.cache.DefaultCacheFactory" + factoryMethod="getInstance" /> + </bean> + +  + <bean name="ExampleCache" class="org.jboss.cache.Cache"> + + <constructor factoryMethod="createCache"> + <factory bean="DefaultCacheFactory"/> + <parameter class="org.jboss.cache.config.Configuration"><inject bean="ExampleCacheConfig"/></parameter> + <parameter class="boolean">false</parameter> + </constructor> + + </bean> + +</deployment> +]]></programlisting> + + <para> + See <ulink url="http://www.jboss.org/jbossmc/docs">the JBoss Microcontainer documentation</ulink> + for details on the above syntax. Basically, each + <literal>bean</literal> + element represents an object and is used to create a + <literal>Configuration</literal> + and its <link linkend="configuration.elements">constituent parts</link> + The <literal>DefaultCacheFactory</literal> bean constructs the cache, + conceptually doing the same thing as is shown in the + <link linkend="api.create_start">User API</link> chapter. + </para> + <para> + An interesting thing to note in the above example is the use of the + <literal>RuntimeConfig</literal> object. External resources like a <literal>TransactionManager</literal> + and a JGroups <literal>ChannelFactory</literal> that are visible to the microcontainer are dependency injected + into the <literal>RuntimeConfig</literal>. The assumption here is that in some other deployment descriptor in + the AS, the referenced beans have already been described. + </para> + </section> + + <section> + <title>Automatic binding to JNDI in JBoss AS</title> + <para> + This feature is not available as of the time of this writing. We will + add a wiki page describing how to use it once it becomes available. + </para> + </section> + + <section> + <title>Runtime Management Information</title> + <para>JBoss Cache includes JMX MBeans to expose cache functionality and provide statistics that can be + used to analyze cache operations. JBoss Cache can also broadcast cache events as MBean notifications for + handling via JMX monitoring tools. + </para> + + <section id="jmx.mbeans"> + <title>JBoss Cache MBeans</title> + <para> + JBoss Cache provides an MBean that can be registered with your environments JMX server to allow access + to the cache instance via JMX. This MBean is the + <literal>org.jboss.cache.jmx.CacheJmxWrapper</literal>. + It is a StandardMBean, so its MBean interface is <literal>org.jboss.cache.jmx.CacheJmxWrapperMBean</literal>. + This MBean can be used to: + <itemizedlist> + <listitem> + Get a reference to the underlying <literal>Cache</literal>. + </listitem> + <listitem> + Invoke create/start/stop/destroy lifecycle operations on the underlying <literal>Cache</literal>. + </listitem> + <listitem> + Inspect various details about the cache's current state (number of nodes, lock information, etc.) + </listitem> + <listitem> + See numerous details about the cache's configuration, and + change those configuration items that can be changed when the + cache has already been started. + </listitem> + </itemizedlist> + See the <literal>CacheJmxWrapperMBean</literal> javadoc for more details. + </para> + <para> + If a <literal>CacheJmxWrapper</literal> is registered, JBoss Cache also provides MBeans + for several other internal components and subsystems. These MBeans are used to capture and expose + statistics related to the subsystems they represent. They are hierarchically associated with the + <literal>CacheJmxWrapper</literal> MBean and have service names that reflect this relationship. For + example, a replication interceptor MBean for the <literal>jboss.cache:service=TomcatClusteringCache</literal> + instance will be accessible through the service named + <literal>jboss.cache:service=TomcatClusteringCache,cache-interceptor=ReplicationInterceptor</literal>. + </para> + </section> + + <section id="jmx.registration"> + <title>Registering the CacheJmxWrapper with the MBeanServer</title> + + <para> + The best way to ensure the <literal>CacheJmxWrapper</literal> is registered in JMX depends on how you are + deploying your cache. + </para> + + <section id="jmx.registration.programatic"> + <title>Programatic Registration</title> + + <section id="jmx.registration.programatic.construct"> + <title>With a Cache instance</title> + <para> + Simplest way to do this is to create your <literal>Cache</literal> and pass it to the + <literal>JmxRegistrationManager</literal> constructor. + </para> + + <programlisting role="JAVA"><![CDATA[ + CacheFactory factory = new DefaultCacheFactory(); + // Build but don't start the cache + // (although it would work OK if we started it) + Cache cache = factory.createCache("cache-configuration.xml"); + + MBeanServer server = getMBeanServer(); // however you do it + ObjectName on = new ObjectName("jboss.cache:service=Cache"); + + JmxRegistrationManager jmxManager = new JmxRegistrationManager(server, cache, on); + jmxManager.registerAllMBeans(); + + ... use the cache + + ... on application shutdown + + jmxManager.unregisterAllMBeans(); + cache.stop(); + + ]]></programlisting> + </section> + + <section id="jmx.registration.programatic.cfg"> + <title>With a Configuration instance</title> + <para> + Alternatively, build a <literal>Configuration</literal> object and pass it to the + <literal>CacheJmxWrapper</literal>. The wrapper will construct the <literal>Cache</literal> on your + behalf. + </para> + + <programlisting role="JAVA"><![CDATA[ + Configuration config = buildConfiguration(); // whatever it does + + CacheJmxWrapperMBean wrapper = new CacheJmxWrapper(config); + MBeanServer server = getMBeanServer(); // however you do it + ObjectName on = new ObjectName("jboss.cache:service=TreeCache"); + server.registerMBean(wrapper, on); + + // Call to wrapper.create() will build the Cache if one wasn't injected + wrapper.create(); + wrapper.start(); + + // Now that it's built, created and started, get the cache from the wrapper + Cache cache = wrapper.getCache(); + + ... use the cache + + ... on application shutdown + + wrapper.stop(); + wrapper.destroy(); + ]]></programlisting> + </section> + </section> + + <section> + <title>JMX-Based Deployment in JBoss AS (JBoss AS 5.x)</title> + <para> + <literal>CacheJmxWrapper</literal> is a POJO, so the microcontainer has no problem creating one. The + trick is getting it to register your bean in JMX. This can be done by specifying the + <literal>org.jboss.aop.microcontainer.aspects.jmx.JMX</literal> + annotation on the <literal>CacheJmxWrapper</literal> + bean: + </para> + + <programlisting role="XML"><![CDATA[ +<?xml version="1.0" encoding="UTF-8"?> + +<deployment xmlns="urn:jboss:bean-deployer:2.0"> + +  + <bean name="ExampleCacheConfig" + class="org.jboss.cache.config.Configuration"> + + ... build up the Configuration + + </bean> + +  + <bean name="DefaultCacheFactory" class="org.jboss.cache.DefaultCacheFactory"> + <constructor factoryClass="org.jboss.cache.DefaultCacheFactory" + factoryMethod="getInstance" /> + </bean> + +  + <bean name="ExampleCache" class="org.jboss.cache.CacheImpl"> + + <constructor factoryMethod="createnewInstance"> + <factory bean="DefaultCacheFactory"/> + <parameter><inject bean="ExampleCacheConfig"/></parameter> + <parameter>false</parameter> + </constructor> + + </bean> + +  + <bean name="ExampleCacheJmxWrapper" class="org.jboss.cache.jmx.CacheJmxWrapper"> + + <annotation>@org.jboss.aop.microcontainer.aspects.jmx.JMX(name="jboss.cache:service=ExampleTreeCache", + exposedInterface=org.jboss.cache.jmx.CacheJmxWrapperMBean.class, + registerDirectly=true)</annotation> + + <constructor> + <parameter><inject bean="ExampleCache"/></parameter> + </constructor> + + </bean> + +</deployment> +]]></programlisting> + + <para> + As discussed in the <link linkend="jmx.registration.programatic">Programatic Registration</link> + section, <literal>CacheJmxWrapper</literal> can do the work of building, creating and starting the + <literal>Cache</literal> if it is provided with a <literal>Configuration</literal>. With the + microcontainer, this is the preferred approach, as it saves the boilerplate XML + needed to create the <literal>CacheFactory</literal>. + </para> + + <programlisting role="XML"><![CDATA[ +<?xml version="1.0" encoding="UTF-8"?> + +<deployment xmlns="urn:jboss:bean-deployer:2.0"> + +  + <bean name="ExampleCacheConfig" + class="org.jboss.cache.config.Configuration"> + + ... build up the Configuration + + </bean> + + <bean name="ExampleCache" class="org.jboss.cache.jmx.CacheJmxWrapper"> + + <annotation>@org.jboss.aop.microcontainer.aspects.jmx.JMX(name="jboss.cache:service=ExampleTreeCache", + exposedInterface=org.jboss.cache.jmx.CacheJmxWrapperMBean.class, + registerDirectly=true)</annotation> + + <constructor> + <parameter><inject bean="ExampleCacheConfig"/></parameter> + </constructor> + + </bean> + +</deployment> +]]></programlisting> + </section> + + </section> + + <section id="jmx.statistics"> + <title>JBoss Cache Statistics</title> + <para> + JBoss Cache captures statistics in its interceptors and various other components, and exposes these + statistics through a set of MBeans. Gathering of statistics is enabled by default; this can be disabled for + a specific cache instance through the <literal>Configuration.setExposeManagementStatistics()</literal> + setter. Note that the majority of the statistics are provided by the <literal>CacheMgmtInterceptor</literal>, + so this MBean is the most significant in this regard. If you want to disable all statistics for performance + reasons, you set <literal>Configuration.setExposeManagementStatistics(false)</literal> and this will + prevent the <literal>CacheMgmtInterceptor</literal> from being included in the cache's interceptor stack + when the cache is started. + </para> + <para> + If a <literal>CacheJmxWrapper</literal> is registered with JMX, the wrapper also ensures that + an MBean is registered in JMX for each interceptor and component that exposes statistics. + <footnote> + <para> + Note that if the + <literal>CacheJmxWrapper</literal> + is not registered in JMX, the + interceptor MBeans will not be registered either. The JBoss Cache 1.4 releases + included code that would try to "discover" an + <literal>MBeanServer</literal> + and + automatically register the interceptor MBeans with it. For JBoss Cache 2.x we decided + that this sort of "discovery" of the JMX environment was beyond the proper scope of + a caching library, so we removed this functionality. + </para> + </footnote>. + Management tools can then access those MBeans to examine the statistics. See the section in the + <link linkend="jmx_reference.statistics">JMX Reference chapter</link> + pertaining to the statistics that are made available via JMX. + </para> + </section> + + <section> + <title>Receiving JMX Notifications</title> + <para> + JBoss Cache users can register a listener to receive cache events described earlier in the + <link linkend="api.listener">User API</link> + chapter. Users can alternatively utilize the cache's management information infrastructure to receive these + events via JMX notifications. Cache events are accessible as notifications by registering a + <literal>NotificationListener</literal> for the <literal>CacheJmxWrapper</literal>. + </para> + + <para> + See the section in the <link linkend="jmx_reference.notifications">JMX Reference chapter</link> + pertaining to JMX notifications for a list of notifications that can be received through the + <literal>CacheJmxWrapper</literal>. + </para> + + <para> + The following is an example of how to programmatically receive cache notifications when running in a + JBoss AS environment. In this example, the client uses a filter to specify which events are of interest. + </para> + + <programlisting role="JAVA"><![CDATA[ + MyListener listener = new MyListener(); + NotificationFilterSupport filter = null; + + // get reference to MBean server + Context ic = new InitialContext(); + MBeanServerConnection server = (MBeanServerConnection)ic.lookup("jmx/invoker/RMIAdaptor"); + + // get reference to CacheMgmtInterceptor MBean + String cache_service = "jboss.cache:service=TomcatClusteringCache"; + ObjectName mgmt_name = new ObjectName(cache_service); + + // configure a filter to only receive node created and removed events + filter = new NotificationFilterSupport(); + filter.disableAllTypes(); + filter.enableType(CacheNotificationBroadcaster.NOTIF_NODE_CREATED); + filter.enableType(CacheNotificationBroadcaster.NOTIF_NODE_REMOVED); + + // register the listener with a filter + // leave the filter null to receive all cache events + server.addNotificationListener(mgmt_name, listener, filter, null); + + // ... + + // on completion of processing, unregister the listener + server.removeNotificationListener(mgmt_name, listener, filter, null); + ]]></programlisting> + + <para>The following is the simple notification listener implementation used in the previous example.</para> + <programlisting role="JAVA"><![CDATA[ + private class MyListener implements NotificationListener, Serializable + { + public void handleNotification(Notification notification, Object handback) + { + String message = notification.getMessage(); + String type = notification.getType(); + Object userData = notification.getUserData(); + + System.out.println(type + ": " + message); + + if (userData == null) + { + System.out.println("notification data is null"); + } + else if (userData instanceof String) + { + System.out.println("notification data: " + (String) userData); + } + else if (userData instanceof Object[]) + { + Object[] ud = (Object[]) userData; + for (Object data : ud) + { + System.out.println("notification data: " + data.toString()); + } + } + else + { + System.out.println("notification data class: " + userData.getClass().getName()); + } + } + } + ]]></programlisting> + + <para>Note that the JBoss Cache management implementation only listens to cache events after a client registers + to receive MBean notifications. As soon as no clients are registered for notifications, the MBean will + remove + itself as a cache listener. + </para> + + </section> + + <section id="jconsole"> + <title>Accessing Cache MBeans in a Standalone Environment using the <literal>jconsole</literal> Utility</title> + <para> + JBoss Cache MBeans are easily accessed when running cache instances in an application server that + provides an MBean server interface such as JBoss JMX Console. Refer to your server documentation + for instructions on how to access MBeans running in a server's MBean container. + </para> + <para> + In addition, though, JBoss Cache MBeans are also accessible when running in a non-server environment using + your JDK's <literal>jconsole</literal> tool. When running a standalone cache outside of an application server, + you can access the cache's MBeans as follows. + </para> + <para> + <orderedlist> + <listitem> + Set the system property <literal>-Dcom.sun.management.jmxremote</literal> + when starting the JVM where the cache will run. + </listitem> + <listitem> + Once the JVM is running, start the <literal>jconsole</literal> utility, located in your JDK's + <literal>/bin</literal> directory. + </listitem> + <listitem> + When the utility loads, you will be able to select your running JVM and connect to it. The + JBoss Cache MBeans will be available on the MBeans panel. + </listitem> + </orderedlist> + </para> + <para>Note that the <literal>jconsole</literal> utility will automatically register as a listener for cache + notifications when connected to a JVM running JBoss Cache instances. + </para> + </section> + </section> +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/eviction_policies.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/eviction_policies.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/eviction_policies.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,508 @@ +<chapter id="eviction_policies"> + <title>Eviction</title> + + <para> + Eviction controls JBoss Cache's memory management by restricting how many nodes are allowed to be stored in + memory, and for how long. Memory constraints on servers mean caches cannot grow indefinitely, so eviction + needs to occur to prevent out of memory errors. Eviction is most often used alongside <link linkend="cache_loaders">cache loaders</link>. + </para> + + <section id="eviction.design"> + <title>Design</title> + <para> + Eviction in JBoss Cache is designed around four concepts: + <itemizedlist> + <listitem>1. Collecting statistics</listitem> + <listitem>2. Determining which nodes to evict</listitem> + <listitem>3. How nodes are evicted</listitem> + <listitem>4. Eviction threads.</listitem> + </itemizedlist> + In addition, Regions play a key role in eviction, as eviction is always configured on a per-region basis so that + different subtrees in the cache can have different eviction characteristics. + </para> + + <section> + <title>Collecting Statistics</title> + <para> + This is done on the caller's thread whenever anyone interacts with the cache. If eviction is enabled, an + <literal>EvictionInterceptor</literal> is added to the interceptor chain and events are recorded in an + event queue. Events are denoted by the <literal>EvictionEvent</literal> class. Event queues are held on + specific Regions so each region has its own event queue. + </para> + <para> + This aspect of eviction is not configurable, except that the <literal>EvictionInterceptor</literal> is either + added to the interceptor chain or not, depending on whether eviction is enabled. + </para> + </section> + + <section> + <title>Determining Which Nodes to Evict</title> + <para> + An <literal>EvictionAlgorithm</literal> implementation processes the eviction queue to decide which nodes to + evict. JBoss Cache ships with a number of implementations, including <literal>FIFOAlgorithm</literal>, + <literal>LRUAlgorithm</literal>, <literal>LFUAlgorithm</literal>, etc. Each implementation has a corresponding + <literal>EvictionAlgorithmConfig</literal> implementation with configuration details for the algorithm. + </para> + <para> + Custom <literal>EvictionAlgorithm</literal> implementations can be provided by implementing the interface + or extending one of the provided implementations. + </para> + <para> + Algorithms are executed by calling its <literal>process()</literal> method and passing in the event queue to + process. This is typically done by calling <literal>Region.processEvictionQueues()</literal>, which will + locate the Algorithm assigned to the region. + </para> + </section> + + <section> + <title>How Nodes are Evicted</title> + <para> + Once the <literal>EvictionAlgorithm</literal> decides which nodes to evict, it uses an implementation of + <literal>EvictionActionPolicy</literal> to determine how to evict nodes. This is configurable on a per-region + basis, and defaults to <literal>DefaultEvictionActionPolicy</literal>, which invokes <literal>Cache.evict()</literal> + for each node that needs to be evicted. + </para> + <para> + JBoss Cache also ships with <literal>RemoveOnEvictActionPolicy</literal>, which calls <literal>Cache.removeNode()</literal> + for each node that needs to be evicted, instead of <literal>Cache.evict()</literal>. + </para> + <para> + Custom <literal>EvictionActionPolicy</literal> implementations can be used as well. + </para> + </section> + + <section> + <title>Eviction threads</title> + <para> + By default, a single cache-wide eviction thread is used to periodically iterate through registered regions + and call <literal>Region.processEvictionQueues()</literal> on each region. The frequency with which this + thread runs can be configured using the <literal>wakeUpInterval</literal> attribute in the <literal>eviction</literal> + configuration element, and defaults to 5000 milliseconds if not specified. + </para> + <para> + The eviction thread can be disabled by setting <literal>wakeUpInterval</literal> to <literal>0</literal>. + This can be useful if you have your own periodic maintenance thread running and would like to iterate through + regions and call <literal>Region.processEvictionQueues()</literal> yourself. + </para> + </section> + </section> + + <section id="regions"> + <title>Eviction Regions</title> + <para> + The concept of regions and the <literal>Region</literal> class were + <link linkend="architecture.regions">visited earlier</link> when talking about marshalling. Regions are also + used to define the eviction behavior for nodes within that region. In addition to using a region-specific + configuration, you can also configure default, cache-wide eviction behavior for nodes that do not fall into + predefined regions or if you do not wish to define specific regions. It is important to note that when + defining regions using the configuration XML file, all elements of the <literal>Fqn</literal> that defines + the region are <literal>String</literal> objects. + </para> + <para> + For each region, you can define eviction parameters. + </para> + + <para>It's possible to define regions that overlap. In other words, one region can be defined for + <literal>/a/b/c</literal>, and another defined for <literal>/a/b/c/d</literal> (which is just the + <emphasis>d</emphasis> subtree of the <literal>/a/b/c</literal> sub-tree). + The algorithm, in order to handle scenarios like this consistently, will always choose the first region + it encounters. In this way, if the algorithm needed to decide how to handle node + <literal>/a/b/c/d/e</literal>, it would start from there and work + its way up the tree until it hits the first defined region - in this case + <literal>/a/b/c/d</literal>. + </para> + <section> + <title>Resident Nodes</title> + <para> + Nodes marked as resident (using + <literal>Node.setResident()</literal> + API) will be ignored by the eviction policies both when checking whether to trigger + the eviction and when proceeding with the actual eviction of nodes. E.g. if a region is configured to have a + maximum of 10 nodes, resident nodes won't be + counted when deciding whether to evict nodes in that region. In addition, resident nodes will not be + considered for eviction when the region's eviction + threshold is reached. + </para> + <para> + In order to mark a node as resident the + <literal>Node.setResident()</literal> + API should be used. By default, the newly created nodes are not resident. + The + <literal>resident</literal> + attribute of a node is neither replicated, persisted nor transaction-aware. + </para> + <para> + A sample use case for resident nodes would be ensuring "path" nodes don't add "noise" to an eviction policy. + E.g.,: + </para> + <programlisting role="JAVA"><![CDATA[ +... + Map lotsOfData = generateData(); + cache.put("/a/b/c", lotsOfData); + cache.getRoot().getChild("/a").setResident(true); + cache.getRoot().getChild("/a/b").setResident(true); +... + ]]></programlisting> + <para> + In this example, the nodes + <literal>/a</literal> + and + <literal>/a/b</literal> + are paths which exist solely to + support the existence of node + <literal>/a/b/c</literal> + and don't hold any data themselves. As such, they are + good candidates for being marked as resident. This would lead to better memory management as no eviction + events would be + generated when accessing + <literal>/a</literal> + and<literal>/a/b</literal>. + </para> + <para> + N.B. when adding attributes to a resident node, e.g. + <literal>cache.put("/a", "k", "v")</literal> + in the above example, it would make sense to mark the nodes + as non-resident again and let them be considered for eviction.. + </para> + </section> + </section> + + <section> + <title>Configuring Eviction</title> + <section id="eviction.basic_cfg"> + <title>Basic Configuration</title> + <para> + The basic eviction configuration element looks like: + </para> + <programlisting role="XML"><![CDATA[ + ... + <eviction wakeUpInterval="500" eventQueueSize="100000"> + <default algorithmClass="org.jboss.cache.eviction.LRUAlgorithm"> + <property name="maxNodes" value="5000" /> + <property name="timeToLive" value="1000" /> + </default> + </eviction> + ... +]]></programlisting> + <para> + <itemizedlist> + <listitem> + <literal>wakeUpInterval</literal> + - this required parameter defines how often the eviction thread runs, in milliseconds. + </listitem> + <listitem> + <literal>eventQueueSize</literal> + - this optional parameter defines the size of the bounded queue which holds eviction events. If your + eviction thread does not run often enough, you may find that the event queue fills up. It may then be + necessary to get your eviction thread to run more frequently, or increase the size of your event queue. + This configuration is just the <emphasis>default</emphasis> event queue size, and can be overridden + in specific eviction regions. If not specified, this defaults to <literal>200000</literal>. + </listitem> + <listitem> + <literal>algorithmClass</literal> + - this is required, unless you set individual <literal>algorithmClass</literal> attributes on each and every region. This + defines the default eviction algorithm to use if one is not defined for a region. + </listitem> + <listitem> + Algorithm configuration attributes - these are specific to the algorithm specified in <literal>algorithmClass</literal>. + See the section specific to the algorithm you are interested in for details. + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>Programmatic Configuration</title> + <para> + Configuring eviction using the + <literal>Configuration</literal> + object entails the use of the + <literal>org.jboss.cache.config.EvictionConfig</literal> + bean, which is passed into + <literal>Configuration.setEvictionConfig()</literal>. See the + <link linkend="configuration">chapter on Configuration</link> + for more on building a + <literal>Configuration</literal> + programatically. + </para> + + <para> + The use of simple POJO beans to represent all elements in a + cache's configuration also makes it fairly easy to programatically + add eviction regions after the cache is started. For example, + assume we had an existing cache configured via XML with the + EvictionConfig element shown above. Now at runtime we wished to + add a new eviction region named "/org/jboss/fifo", using + <literal>LRUAlgorithm</literal> + but a different number of + <literal>maxNodes</literal>: + </para> + + <programlisting role="JAVA"><![CDATA[ + Fqn fqn = Fqn.fromString("/org/jboss/fifo"); + + // Create a configuration for an LRUPolicy + LRUAlgorithmConfig lruc = new LRUAlgorithmConfig(); + lruc.setMaxNodes(10000); + + // Create an eviction region config + EvictionRegionConfig erc = new EvictionRegionConfig(fqn, lruc); + + // Create the region and set the config + Region region = cache.getRegion(fqn, true); + region.setEvictionRegionConfig(erc); + ]]></programlisting> + </section> + </section> + + <section id="eviction.shipped"> + <title>Shipped Eviction Policies</title> + + This section details the different algorithms shipped with JBoss Cache, and the various configuration parameters + used for each algorithm. + + <section> + <title>LRUAlgorithm - Least Recently Used</title> + + <para> + <literal>org.jboss.cache.eviction.LRUAlgorithm</literal> + controls both the node lifetime and age. This policy guarantees a constant order ( + <literal>O (1)</literal> + ) for + adds, removals and lookups (visits). It has the following configuration + parameters: + </para> + + <itemizedlist> + <listitem> + <literal>maxNodes</literal> + - This is the maximum number of nodes allowed in this region. 0 denotes immediate expiry, -1 denotes no limit. + </listitem> + <listitem> + <literal>timeToLive</literal> + - The amount of time a node is not written to or read (in milliseconds) before the node is swept away. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + + <listitem> + <literal>maxAge</literal> + - Lifespan of a node (in milliseconds) regardless of idle time before the node is swept away. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + + <listitem> + <literal>minTimeToLive</literal> + - the minimum amount of time a node must be allowed to live after being accessed before it is allowed to + be considered for eviction. 0 denotes that this feature is disabled, which is the default value. + </listitem> + </itemizedlist> + </section> + + <section> + <title>FIFOAlgorithm - First In, First Out</title> + + <para> + <literal>org.jboss.cache.eviction.FIFOAlgorithm</literal> + controls the eviction in a proper first in first out order. This policy + guarantees a constant order ( + <literal>O (1)</literal> + ) for adds, removals and lookups (visits). It has the + following configuration parameters: + </para> + + <itemizedlist> + <listitem> + <literal>maxNodes</literal> + - This is the maximum number of nodes allowed in this region. 0 denotes immediate expiry, -1 denotes no limit. + </listitem> + <listitem> + <literal>minTimeToLive</literal> + - the minimum amount of time a node must be allowed to live after being accessed before it is allowed to + be considered for eviction. 0 denotes that this feature is disabled, which is the default value. + </listitem> + </itemizedlist> + </section> + + + <section> + <title>MRUAlgorithm - Most Recently Used</title> + + <para> + <literal>org.jboss.cache.eviction.MRUAlgorithm</literal> + controls + the eviction in based on most recently used algorithm. The most recently + used nodes will be the first to evict with this policy. This policy + guarantees a constant order ( + <literal>O (1)</literal> + ) for adds, removals and lookups (visits). It has the + following configuration parameters: + </para> + + <itemizedlist> + <listitem> + <literal>maxNodes</literal> + - This is the maximum number of nodes allowed in this region. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + <listitem> + <literal>minTimeToLive</literal> + - the minimum amount of time a node must be allowed to live after being accessed before it is allowed to + be considered for eviction. 0 denotes that this feature is disabled, which is the default value. + </listitem> + </itemizedlist> + </section> + + <section> + <title>LFUAlgorithm - Least Frequently Used</title> + + <para> + <literal>org.jboss.cache.eviction.LFUAlgorithm</literal> + controls + the eviction in based on least frequently used algorithm. The least + frequently used nodes will be the first to evict with this policy. Node + usage starts at 1 when a node is first added. Each time it is visited, + the node usage counter increments by 1. This number is used to determine + which nodes are least frequently used. LFU is also a sorted eviction + algorithm. The underlying EvictionQueue implementation and algorithm is + sorted in ascending order of the node visits counter. This class + guarantees a constant order ( + <literal>O (1)</literal> + ) for adds, removal and searches. However, when any + number of nodes are added/visited to the queue for a given processing + pass, a single quasilinear ( + <literal>O (n * log n)</literal> + ) operation is used to resort the queue in + proper LFU order. Similarly if any nodes are removed or evicted, a + single linear ( + <literal>O (n)</literal> + ) pruning operation is necessary to clean up the + EvictionQueue. LFU has the following configuration parameters: + </para> + + <itemizedlist> + <listitem> + <literal>maxNodes</literal> + - This is the maximum number of nodes allowed in this region. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + <listitem> + <literal>minNodes</literal> + - This is the minimum number of nodes allowed in this region. This value determines what + the eviction queue should prune down to per pass. e.g. If + minNodes is 10 and the cache grows to 100 nodes, the cache is + pruned down to the 10 most frequently used nodes when the + eviction timer makes a pass through the eviction + algorithm. + </listitem> + <listitem> + <literal>minTimeToLive</literal> + - the minimum amount of time a node must be allowed to live after being accessed before it is allowed to + be considered for eviction. 0 denotes that this feature is disabled, which is the default value. + </listitem> + </itemizedlist> + + </section> + + <section> + <title>ExpirationAlgorithm</title> + + <para> + <literal>org.jboss.cache.eviction.ExpirationAlgorithm</literal> + is a policy + that evicts nodes based on an absolute expiration time. The + expiration time is indicated using the + <literal>org.jboss.cache.Node.put()</literal> + method, using a String key + <literal>expiration</literal> + and the absolute time as a + <literal>java.lang.Long</literal> + object, with a value indicated as milliseconds past midnight + January 1st, 1970 UTC (the same relative time as provided by + <literal>java.lang.System.currentTimeMillis()</literal> + ). + </para> + + <para> + This policy guarantees a constant order ( + <literal>O (1)</literal> + ) for adds and removals. + Internally, a sorted set (TreeSet) containing the expiration + time and Fqn of the nodes is stored, which essentially + functions as a heap. + </para> + + <para> + This policy has the following configuration parameters: + </para> + + <itemizedlist> + <listitem> + <literal>expirationKeyName</literal> + - This is the Node key name used + in the eviction algorithm. The configuration default is + <literal>expiration</literal> + . + </listitem> + <listitem> + <literal>maxNodes</literal> + - This is the maximum number of nodes allowed in this region. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + </itemizedlist> + + <para> + The following listing shows how the expiration date is indicated and how the + policy is applied: + </para> + <programlisting role="JAVA"><![CDATA[ + Cache cache = DefaultCacheFactory.createCache(); + Fqn fqn1 = Fqn.fromString("/node/1"); + Long future = new Long(System.currentTimeMillis() + 2000); + + // sets the expiry time for a node + cache.getRoot().addChild(fqn1).put(ExpirationConfiguration.EXPIRATION_KEY, future); + + assertTrue(cache.getRoot().hasChild(fqn1)); + Thread.sleep(5000); + + // after 5 seconds, expiration completes + assertFalse(cache.getRoot().hasChild(fqn1)); + ]]></programlisting> + <para> + Note that the expiration time of nodes is only checked when the + region manager wakes up every + <literal>wakeUpIntervalSeconds</literal> + , so eviction + may happen a few seconds later than indicated. + </para> + </section> + <section> + <title>ElementSizeAlgorithm - Eviction based on number of key/value pairs in a node</title> + + <para> + <literal>org.jboss.cache.eviction.ElementSizeAlgorithm</literal> + controls + the eviction in based on the number of key/value pairs in the node. Nodes The most recently + used nodes will be the first to evict with this policy. It has the following configuration parameters: + </para> + + <itemizedlist> + <listitem> + <literal>maxNodes</literal> + - This is the maximum number of nodes allowed in this region. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + <listitem> + <literal>maxElementsPerNode</literal> + - This is the trigger number of attributes per node for the node to be selected for eviction. 0 + denotes immediate expiry, -1 denotes no limit. + </listitem> + <listitem> + <literal>minTimeToLive</literal> + - the minimum amount of time a node must be allowed to live after being accessed before it is allowed to + be considered for eviction. 0 denotes that this feature is disabled, which is the default value. + </listitem> + </itemizedlist> + </section> + </section> +</chapter> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/images/icon.svg =================================================================== --- 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+ + <para> + JBoss Cache is a tree-structured, clustered, transactional cache. It can be used in a standalone, non-clustered + environment, to cache frequently accessed data in memory thereby removing data retrieval or calculation bottlenecks + while providing "enterprise" features such as <ulink url="http://java.sun.com/products/jta">JTA</ulink> compatibility, eviction and persistence. + </para> + <para> + JBoss Cache is also a clustered cache, and can be used in a cluster to replicate state providing a high degree + of failover. A variety of replication modes are supported, including invalidation and buddy replication, and + network communications can either be synchronous or asynchronous. + </para> + <para> + When used in a clustered mode, the cache is an effective mechanism of building high availability, fault + tolerance and even load balancing into custom applications and frameworks. For example, the + <ulink url="http://www.jboss.org/projects/jbossas/">JBoss Application Server</ulink> and Red Hat's + <ulink url="http://www.jboss.com">Enterprise Application Platform</ulink> make extensive use of JBoss Cache to + cluster services such as HTTP and <ulink url="http://java.sun.com/products/ejb/">EJB</ulink> sessions, as well as + providing a distributed entity cache for <ulink url="http://en.wikipedia.org/wiki/Java_Persistence_API">JPA</ulink>. + </para> + <para> + JBoss Cache can - and often is - used outside of JBoss AS, in other Java EE environments such as Spring, Tomcat, + Glassfish, BEA WebLogic, IBM WebSphere, and even in standalone Java programs thanks to its minimal dependency set. + </para> + <section> + <title>And what is POJO Cache?</title> + <para> + POJO Cache is an extension of the core JBoss Cache API. POJO Cache offers additional functionality such as: + <itemizedlist> + <listitem>maintaining object references even after replication or persistence.</listitem> + <listitem>fine grained replication, where only modified object fields are replicated.</listitem> + <listitem>"API-less" clustering model where POJOs are simply annotated as being clustered.</listitem> + </itemizedlist> + </para> + <para> + POJO Cache has a complete and separate set of documentation, including a Users' Guide, FAQ and tutorial all + available on the JBoss Cache <ulink url="http://www.jboss.org/jbosscache">documentation website</ulink>. + As such, POJO Cache will not be discussed further in this book. + </para> + </section> + + </section> + + <section> + <title>Summary of Features</title> + + <section> + <title>Caching objects</title> + + <para> + JBoss Cache offers a simple and straightforward API, where data - simple Java objects - can be placed in the + cache. Based on configuration options selected, this data may be one or all of: + <itemizedlist> + <listitem>cached in-memory for efficient, thread-safe retrieval.</listitem> + <listitem>replicated to some or all cache instances in a cluster.</listitem> + <listitem>persisted to disk and/or a remote, in-memory cache cluster ("far-cache").</listitem> + <listitem>garbage collected from memory when memory runs low, and passivated to disk so state isn't lost. + </listitem> + </itemizedlist> + In addition, JBoss Cache offers a rich set of enterprise-class features: + <itemizedlist> + <listitem>being able to participate in <ulink url="http://java.sun.com/products/jta">JTA</ulink> transactions + (works with most Java EE compliant transaction managers).</listitem> + <listitem>attach to JMX consoles and provide runtime statistics on the state of the cache.</listitem> + <listitem>allow client code to attach listeners and receive notifications on cache events.</listitem> + <listitem>allow grouping of cache operations into batches, for efficient replication</listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>Local and clustered modes</title> + + <para> + The cache is organized as a tree, with a single root. Each node in the tree essentially contains a map, + which acts as a store for key/value pairs. The only requirement placed on objects that are cached is that + they implement <literal>java.io.Serializable</literal>. + </para> + + <para> + JBoss Cache can be either local or replicated. Local caches exist only within the scope of the JVM in which + they are created, whereas replicated caches propagate any changes to some or all other caches in the same + cluster. A cluster may span different hosts on a network or just different JVMs on a single host. + </para> + + </section> + + <section> + <title>Clustered caches and transactions</title> + + <para> + When a change is made to an object in the cache and that change is done in + the context of a transaction, the replication of changes is deferred until the transaction + completes successfully. All modifications are kept in a list associated with + the transaction of the caller. When the transaction commits, changes are replicated. Otherwise, on a rollback, + we simply undo the changes locally and discard the modification list, resulting in zero network traffic and + overhead. For example, if a caller makes 100 modifications and then rolls back the transaction, nothing is + replicated, resulting in no network traffic. + </para> + + <para> + If a caller has no transaction or batch associated with it, modifications are replicated immediately. E.g. + in the example used earlier, 100 messages would be broadcast for each modification. In this sense, running without + a batch or transaction can be thought of as analogous as running with auto-commit switched on in JDBC terminology, + where each operation is committed automatically and immediately. + </para> + + <para> + JBoss Cache works out of the box with most popular transaction managers, and even provides an API where + custom transaction manager lookups can be written. + </para> + + <para> + All of the above holds true for batches as well, which has similar behavior. + </para> + </section> + + + <section> + <title>Thread safety</title> + <para> + The cache is completely thread-safe. It employs multi-versioned concurrency control (MVCC) to ensure thread + safety between readers and writers, while maintaining a high degree of concurrency. The specific MVCC implementation + used in JBoss Cache allows for reader threads to be completely free of locks and synchronized blocks, ensuring a very high + degree of performance for read-heavy applications. It also uses custom, highly performant lock implementations + that employ modern compare-and-swap techniques for writer threads, which are tuned to multi-core CPU architectures. + </para> + <para> + Multi-versioned concurrency control (MVCC) is the default locking scheme since JBoss Cache 3.x. + Optimistic and pessimistic locking schemes from older versions of JBoss Cache are still available but are + deprecated in favor of MVCC, and will be removed in future releases. Use of these deprecated locking + schemes are strongly discouraged. + </para> + <para> + The JBoss Cache MVCC implementation only supports READ_COMMITTED and REPEATABLE_READ isolation levels, corresponding + to their database equivalents. See the section on <link linkend="transactions">transactions and concurrency</link> for details on MVCC. + </para> + </section> + </section> + + <section> + <title> + Requirements + </title> + <para> + JBoss Cache requires a Java 5.0 (or newer) compatible virtual machine and set of libraries, and is developed + and tested on Sun's JDK 5.0 and JDK 6. + </para> + <para> + There is a way to build JBoss Cache as a Java 1.4.x compatible binary using + <ulink url="http://www.jboss.org/community/docs/DOC-10738">JBossRetro</ulink> + to retroweave the Java 5.0 binaries. However, Red Hat Inc. does not offer professional support around the + retroweaved + binary at this time and the Java 1.4.x compatible binary is not in the binary distribution. See + <ulink url="http://www.jboss.org/community/docs/DOC-10263">this wiki</ulink> + page for + details on building the retroweaved binary for yourself. + </para> + <para> + In addition to Java 5.0, at a minimum, JBoss Cache has dependencies on + <ulink url="http://www.jgroups.org">JGroups</ulink>, and Apache's + <ulink url="http://jakarta.apache.org/commons/logging/">commons-logging</ulink>. JBoss Cache ships with all + dependent libraries necessary to run out of the box, as well as several optional jars for optional features. + </para> + </section> + + <section> + <title>License</title> + <para> + JBoss Cache is an open source project, using the business and OEM-friendly + <ulink url="http://www.opensource.org/">OSI-approved</ulink> + <ulink url="http://www.gnu.org/copyleft/lesser.html">LGPL license.</ulink> + Commercial development support, production support and training for JBoss Cache is available through + <ulink url="http://www.jboss.com">JBoss, a division of Red Hat Inc.</ulink> + </para> + </section> +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/jmx_reference.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/jmx_reference.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/jmx_reference.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,327 @@ +<chapter id="jmx_reference"> + <title>JMX References</title> + <section id="jmx_reference.statistics"> + <title>JBoss Cache Statistics</title> + <para> + There is a whole wealth of information being gathered and exposed on to JMX for monitoring the cache. Some + of these are detailed below: + </para> + <table> + <title>JBoss Cache JMX MBeans</title> + <tgroup cols="3"> + <thead> + <row> + <entry>MBean</entry> + <entry>Attribute/Operation Name</entry> + <entry>Description</entry> + </row> + </thead> + <tbody> + <row> + <entry>DataContainerImpl</entry> + <entry>getNumberOfAttributes()</entry> + <entry>Returns the number of attributes in all nodes in the data container</entry> + </row> + <row> + <entry></entry> + <entry>getNumberOfNodes()</entry> + <entry>Returns the number of nodes in the data container</entry> + </row> + <row> + <entry></entry> + <entry>printDetails()</entry> + <entry>Prints details of the data container</entry> + </row> + + <row> + <entry>RPCManagerImpl</entry> + <entry>localAddressString</entry> + <entry>String representation of the local address</entry> + </row> + <row> + <entry></entry> + <entry>membersString</entry> + <entry>String representation of the cluster view</entry> + </row> + <row> + <entry></entry> + <entry>statisticsEnabled</entry> + <entry>Whether RPC statistics are being gathered</entry> + </row> + <row> + <entry></entry> + <entry>replicationCount</entry> + <entry>Number of successful replications</entry> + </row> + <row> + <entry></entry> + <entry>replicationFailures</entry> + <entry>Number of failed replications</entry> + </row> + <row> + <entry></entry> + <entry>successRatio</entry> + <entry>RPC call success ratio</entry> + </row> + + <row> + <entry>RegionManagerImpl</entry> + <entry>dumpRegions()</entry> + <entry>Dumps a String representation of all registered regions, including eviction regions depicting their event queue sizes</entry> + </row> + <row> + <entry></entry> + <entry>numRegions</entry> + <entry>Number of registered regions</entry> + </row> + <row> + <entry>BuddyManager</entry> + <entry>buddyGroup</entry> + <entry>A String representation of the cache's buddy group</entry> + </row> + <row> + <entry></entry> + <entry>buddyGroupsIParticipateIn</entry> + <entry>String representations of all buddy groups the cache participates in</entry> + </row> + <row> + <entry>TransactionTable</entry> + <entry>numberOfRegisteredTransactions</entry> + <entry>The number of registered, ongoing transactions</entry> + </row> + <row> + <entry></entry> + <entry>transactionMap</entry> + <entry>A String representation of all currently registered transactions mapped to internal GlobalTransaction instances</entry> + </row> + + <row> + <entry>MVCCLockManager</entry> + <entry>concurrencyLevel</entry> + <entry>The configured concurrency level</entry> + </row> + <row> + <entry></entry> + <entry>numberOfLocksAvailable</entry> + <entry>Number of locks in the shared lock pool that are not used</entry> + </row> + <row> + <entry></entry> + <entry>numberOfLocksHeld</entry> + <entry>Number of locks in the shared lock pool that are in use</entry> + </row> + <row> + <entry></entry> + <entry>testHashing(String fqn)</entry> + <entry>Tests the spreading of locks across Fqns. For a given (String based) Fqn, this method returns the index in the lock array that it maps to.</entry> + </row> + <row> + <entry>ActivationInterceptor</entry> + <entry>Activations</entry> + <entry>Number of passivated nodes that have been activated.</entry> + </row> + <row> + <entry>CacheLoaderInterceptor</entry> + <entry>CacheLoaderLoads</entry> + <entry>Number of nodes loaded through a cache loader.</entry> + </row> + <row> + <entry></entry> + <entry>CacheLoaderMisses</entry> + <entry>Number of unsuccessful attempts to load a node through a cache loader.</entry> + </row> + <row> + <entry>CacheMgmtInterceptor</entry> + <entry>Hits</entry> + <entry>Number of successful attribute retrievals.</entry> + </row> + <row> + <entry></entry> + <entry>Misses</entry> + <entry>Number of unsuccessful attribute retrievals.</entry> + </row> + <row> + <entry></entry> + <entry>Stores</entry> + <entry>Number of attribute store operations.</entry> + </row> + <row> + <entry></entry> + <entry>Evictions</entry> + <entry>Number of node evictions.</entry> + </row> + <row> + <entry></entry> + <entry>NumberOfAttributes</entry> + <entry>Number of attributes currently cached.</entry> + </row> + <row> + <entry></entry> + <entry>NumberOfNodes</entry> + <entry>Number of nodes currently cached.</entry> + </row> + <row> + <entry></entry> + <entry>ElapsedTime</entry> + <entry>Number of seconds that the cache has been running.</entry> + </row> + <row> + <entry></entry> + <entry>TimeSinceReset</entry> + <entry>Number of seconds since the cache statistics have been reset.</entry> + </row> + <row> + <entry></entry> + <entry>AverageReadTime</entry> + <entry>Average time in milliseconds to retrieve a cache attribute, including unsuccessful + attribute retrievals. + </entry> + </row> + <row> + <entry></entry> + <entry>AverageWriteTime</entry> + <entry>Average time in milliseconds to write a cache attribute.</entry> + </row> + <row> + <entry></entry> + <entry>HitMissRatio</entry> + <entry>Ratio of hits to hits and misses. A hit is a get attribute operation that results in an object + being + returned to the client. The retrieval may be from a cache loader if the entry isn't in the local + cache. + </entry> + </row> + <row> + <entry></entry> + <entry>ReadWriteRatio</entry> + <entry>Ratio of read operations to write operations. This is the ratio of cache hits and misses to + cache stores. + </entry> + </row> + <row> + <entry>CacheStoreInterceptor</entry> + <entry>CacheLoaderStores</entry> + <entry>Number of nodes written to the cache loader.</entry> + </row> + <row> + <entry>InvalidationInterceptor</entry> + <entry>Invalidations</entry> + <entry>Number of cached nodes that have been invalidated.</entry> + </row> + <row> + <entry>PassivationInterceptor</entry> + <entry>Passivations</entry> + <entry>Number of cached nodes that have been passivated.</entry> + </row> + <row> + <entry>TxInterceptor</entry> + <entry>Prepares</entry> + <entry>Number of transaction prepare operations performed by this interceptor.</entry> + </row> + <row> + <entry></entry> + <entry>Commits</entry> + <entry>Number of transaction commit operations performed by this interceptor.</entry> + </row> + <row> + <entry></entry> + <entry>Rollbacks</entry> + <entry>Number of transaction rollbacks operations performed by this interceptor.</entry> + </row> + <row> + <entry></entry> + <entry>numberOfSyncsRegistered</entry> + <entry>Number of synchronizations registered with the transaction manager pending completion and removal.</entry> + </row> + + + </tbody> + </tgroup> + </table> + </section> + + <section id="jmx_reference.notifications"> + <title>JMX MBean Notifications</title> + <para>The following table depicts the JMX notifications available for JBoss Cache as well as the cache events to + which they correspond. These are the notifications that can be received through the + <literal>CacheJmxWrapper</literal> + MBean. + Each notification represents a single event published by JBoss Cache and provides user data corresponding to + the parameters of the event. + </para> + <table> + <title>JBoss Cache MBean Notifications</title> + <tgroup cols="3"> + <thead> + <row> + <entry>Notification Type</entry> + <entry>Notification Data</entry> + <entry>CacheListener Event</entry> + </row> + </thead> + <tbody> + <row> + <entry>org.jboss.cache.CacheStarted</entry> + <entry>String: cache service name</entry> + <entry>@CacheStarted</entry> + </row> + <row> + <entry>org.jboss.cache.CacheStopped</entry> + <entry>String: cache service name</entry> + <entry>@CacheStopped</entry> + </row> + <row> + <entry>org.jboss.cache.NodeCreated</entry> + <entry>String: fqn, boolean: isPre, boolean: isOriginLocal</entry> + <entry>@NodeCreated</entry> + </row> + <row> + <entry>org.jboss.cache.NodeEvicted</entry> + <entry>String: fqn, boolean: isPre, boolean: isOriginLocal</entry> + <entry>@NodeEvicted</entry> + </row> + <row> + <entry>org.jboss.cache.NodeLoaded</entry> + <entry>String: fqn, boolean: isPre</entry> + <entry>@NodeLoaded</entry> + </row> + <row> + <entry>org.jboss.cache.NodeModifed</entry> + <entry>String: fqn, boolean: isPre, boolean: isOriginLocal</entry> + <entry>@NodeModifed</entry> + </row> + <row> + <entry>org.jboss.cache.NodeRemoved</entry> + <entry>String: fqn, boolean: isPre, boolean: isOriginLocal</entry> + <entry>@NodeRemoved</entry> + </row> + <row> + <entry>org.jboss.cache.NodeVisited</entry> + <entry>String: fqn, boolean: isPre</entry> + <entry>@NodeVisited</entry> + </row> + <row> + <entry>org.jboss.cache.ViewChanged</entry> + <entry>String: view</entry> + <entry>@ViewChanged</entry> + </row> + <row> + <entry>org.jboss.cache.NodeActivated</entry> + <entry>String: fqn</entry> + <entry>@NodeActivated</entry> + </row> + <row> + <entry>org.jboss.cache.NodeMoved</entry> + <entry>String: fromFqn, String: toFqn, boolean: isPre</entry> + <entry>@NodeMoved</entry> + </row> + <row> + <entry>org.jboss.cache.NodePassivated</entry> + <entry>String: fqn</entry> + <entry>@NodePassivated</entry> + </row> + </tbody> + </tgroup> + </table> + </section> +</chapter> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/master.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/master.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/master.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,114 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.3CR3//EN" + "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ + <!ENTITY preface SYSTEM "modules/preface.xml"> + <!ENTITY introduction SYSTEM "modules/introduction.xml"> + <!ENTITY architecture SYSTEM "modules/architecture.xml"> + <!ENTITY basic_api SYSTEM "modules/basic_api.xml"> + <!ENTITY replication SYSTEM "modules/replication.xml"> + <!ENTITY transactions SYSTEM "modules/transactions.xml"> + <!ENTITY eviction_policies SYSTEM "modules/eviction_policies.xml"> + <!ENTITY cache_loaders SYSTEM "modules/cache_loaders.xml"> + <!ENTITY compatibility SYSTEM "modules/compatibility.xml"> + <!ENTITY configuration SYSTEM "modules/configuration.xml"> + <!ENTITY deployment SYSTEM "modules/deployment.xml"> + <!ENTITY configuration_reference SYSTEM "modules/configuration_reference.xml"> + <!ENTITY jmx_reference SYSTEM "modules/jmx_reference.xml"> + <!ENTITY batching SYSTEM "modules/batching.xml"> + ]> +<book lang="en"> + <bookinfo> + <title>JBoss Cache Users' Guide</title> + <subtitle>A clustered, transactional cache</subtitle> + +  + <releaseinfo>Release 3.1.0 Cascabel</releaseinfo> + <pubdate>April 2009</pubdate> + +  + <author> + <firstname>Manik</firstname> + <surname>Surtani</surname> + <email>manik AT jboss DOT org</email> + </author> + + <author> + <firstname>Brian</firstname> + <surname>Stansberry</surname> + <email>brian DOT stansberry AT jboss DOT com</email> + </author> + + <author> + <firstname>Galder</firstname> + <surname>Zamarreño</surname> + <email>galder DOT zamarreno AT jboss DOT com</email> + </author> + + <author> + <firstname>Mircea</firstname> + <surname>Markus</surname> + <email>mircea DOT markus AT jboss DOT com</email> + </author> + +  + <copyright> + <year>2004</year> + <year>2005</year> + <year>2006</year> + <year>2007</year> + <year>2008</year> + <year>2009</year> + <holder>JBoss, a division of Red Hat Inc., and all authors as named.</holder> + </copyright> + + </bookinfo> + +  + <toc/> + + &preface; + + <part label="I"> + <title>Introduction to JBoss Cache</title> + <partintro> + <para> + This section covers what developers would need to quickly start using JBoss Cache in their projects. It + covers an overview of the concepts and API, configuration and deployment information. + </para> + </partintro> + &introduction; + &basic_api; + &configuration; + &batching; + &deployment; + &compatibility; + </part> + + <part label="II"> + <title>JBoss Cache Architecture</title> + <partintro> + <para> + This section digs deeper into the JBoss Cache architecture, and is meant for developers wishing to use the more + advanced cache features,extend or enhance the cache, write plugins, or are just looking for detailed knowledge + of how things work under the hood. + </para> + </partintro> + &architecture; + &replication; + &cache_loaders; + &eviction_policies; + &transactions; + </part> + + <part label="III"> + <title>JBoss Cache Configuration References</title> + <partintro> + <para> + This section contains technical references for easy looking up. + </para> + </partintro> + + &configuration_reference; + &jmx_reference; + </part> +</book> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/preface.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/preface.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/preface.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,55 @@ +<preface id="preface"> + <title>Preface</title> + + <para> + This is the official JBoss Cache Users' Guide. Along with its accompanying documents (an FAQ, a tutorial and a + whole set of documents on POJO Cache), this is freely available on the JBoss Cache <ulink url="http://www.jboss.org/jbosscache">documentation website</ulink>. + </para> + <para> + When used, JBoss Cache refers to JBoss Cache Core, a tree-structured, clustered, transactional cache. + POJO Cache, also a part of the JBoss Cache distribution, is documented separately. (POJO Cache is a cache that + deals with Plain Old Java Objects, complete with object relationships, with the ability to cluster such POJOs + while maintaining their relationships. Please see the POJO Cache documentation for more information about this.) + </para> + + <para> + This book is targeted at developers wishing to use JBoss Cache as either a standalone in-memory cache, + a distributed or replicated cache, a clustering library, or an in-memory database. It is targeted at application + developers who wish to use JBoss Cache in their code base, as well as "OEM" developers who wish to build on and + extend JBoss Cache features. As such, this book is split into two major sections - one detailing the "User" API + and the other going much deeper into specialist topics and the JBoss Cache architecture. + </para> + + <para> + In general, a good knowledge of the Java programming language along with a strong appreciation and understanding + of transactions and concurrent programming is necessary. No prior knowledge of JBoss Application Server is expected + or required. + </para> + + <para> + For further discussion, use the user forum available on the JBoss Cache + <ulink url="http://www.jboss.org/jbosscache">website.</ulink> We also provide a mechanism for + tracking bug reports and feature requests on the JBoss Cache <ulink url="http://jira.jboss.com/jira/browse/JBCACHE">JIRA issue tracker</ulink>. + </para> + <para> + If you are interested in the development of JBoss Cache or in translating this documentation into other languages, + we'd love to hear from you. Please post a message on the JBoss Cache + <ulink url="http://www.jboss.org/jbosscache">user forum</ulink> + or contact us by using the JBoss Cache <ulink url="https://lists.jboss.org/mailman/listinfo/jbosscache-dev">developer mailing list</ulink>. + </para> + + <para> + This book is specifically targeted at the JBoss Cache release of the same version number. It may not apply to + older or newer releases of JBoss Cache. It is important that you use the documentation appropriate to the version + of JBoss Cache you intend to use. + </para> + + <para> + I always appreciate feedback, suggestions and corrections, and these should be directed to the + <ulink url="https://lists.jboss.org/mailman/listinfo/jbosscache-dev">developer mailing list</ulink> rather than + direct emails to any of the authors. We hope you find this book useful, and wish you happy reading! + </para> + <para> + <emphasis role="bold">Manik Surtani</emphasis>, October 2008 + </para> +</preface> \ No newline at end of file Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/replication.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/replication.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/replication.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,697 @@ +<?xml version="1.0" encoding="UTF-8"?> +<chapter id="clustering"> + <title>Cache Modes and Clustering</title> + + <para>This chapter talks about aspects around clustering JBoss Cache.</para> + + <section> + <title>Cache Replication Modes</title> + + <para>JBoss Cache can be configured to be either local (standalone) or + clustered. If in a cluster, the cache can be configured to replicate + changes, or to invalidate changes. A detailed discussion on this + follows. + </para> + + <section> + <title>Local Mode</title> + + <para>Local caches don't join a cluster and don't communicate with other + caches in a cluster. The dependency on the + JGroups library is still there, although a JGroups channel is not + started. + </para> + </section> + + <section> + <title>Replicated Caches</title> + + <para>Replicated caches replicate all changes to some or all of the other cache + instances in the cluster. Replication can either happen after each + modification (no transactions or batches), or at the end of a transaction or batch. + </para> + + <para>Replication can be synchronous or asynchronous. Use of either one + of the options is application dependent. Synchronous replication blocks + the caller (e.g. on a + <literal>put()</literal> + ) until the modifications + have been replicated successfully to all nodes in a cluster. + Asynchronous replication performs replication in the background (the + <literal>put()</literal> + returns immediately). JBoss Cache also offers a + replication queue, where modifications are replicated periodically (i.e. + interval-based), or when the queue size exceeds a number of elements, or + a combination thereof. A replication queue can therefore offer much higher performance as the actual + replication is performed by a background thread. + </para> + + <para>Asynchronous replication is faster (no caller blocking), because + synchronous replication requires acknowledgments from all nodes in a + cluster that they received and applied the modification successfully + (round-trip time). However, when a synchronous replication returns + successfully, the caller knows for sure that all modifications have been + applied to all cache instances, whereas this is not be the case with asynchronous + replication. With asynchronous replication, errors are simply written to + a log. Even when using transactions, a transaction may succeed but + replication may not succeed on all cache instances. + </para> + + <section id="replication.tx"> + <title>Replicated Caches and Transactions</title> + + <para>When using transactions, replication only occurs at the + transaction boundary - i.e., when a transaction commits. This results + in minimizing replication traffic since a single modification is + broadcast rather than a series of individual modifications, and can be + a lot more efficient than not using transactions. Another effect of + this is that if a transaction were to roll back, nothing is broadcast + across a cluster. + </para> + + <para>Depending on whether you are running your cluster in + asynchronous or synchronous mode, JBoss Cache will use either a single + phase or + <ulink + url="http://en.wikipedia.org/wiki/Two-phase_commit_protocol">two phase + commit + </ulink> + protocol, respectively. + </para> + + <section> + <title>One Phase Commits</title> + + <para>Used when your cache mode is REPL_ASYNC. All modifications are + replicated in a single call, which instructs remote caches to apply + the changes to their local in-memory state and commit locally. + Remote errors/rollbacks are never fed back to the originator of the + transaction since the communication is asynchronous. + </para> + </section> + + <section> + <title>Two Phase Commits</title> + + <para>Used when your cache mode is REPL_SYNC. Upon committing your + transaction, JBoss Cache broadcasts a prepare call, which carries + all modifications relevant to the transaction. Remote caches then + acquire local locks on their in-memory state and apply the + modifications. Once all remote caches respond to the prepare call, + the originator of the transaction broadcasts a commit. This + instructs all remote caches to commit their data. If any of the + caches fail to respond to the prepare phase, the originator + broadcasts a rollback. + </para> + + <para>Note that although the prepare phase is synchronous, the + commit and rollback phases are asynchronous. This is because + <ulink + url="http://java.sun.com/products/jta/">Sun's JTA + specification + </ulink> + does not specify how transactional resources + should deal with failures at this stage of a transaction; and other + resources participating in the transaction may have indeterminate + state anyway. As such, we do away with the overhead of synchronous + communication for this phase of the transaction. That said, they can + be forced to be synchronous using the + <literal>SyncCommitPhase</literal> + and + <literal>SyncRollbackPhase</literal> + configuration + attributes. + </para> + </section> + </section> + + <section id="br"> + <title>Buddy Replication</title> + + <para>Buddy Replication allows you to suppress replicating your data + to all instances in a cluster. Instead, each instance picks one or + more 'buddies' in the cluster, and only replicates to these specific + buddies. This greatly helps scalability as there is no longer a memory + and network traffic impact every time another instance is added to a + cluster. + </para> + + <para>One of the most common use cases of Buddy Replication is when a + replicated cache is used by a servlet container to store HTTP session + data. One of the pre-requisites to buddy replication working well and + being a real benefit is the use of + <emphasis>session + affinity + </emphasis> + , more casually known as + <emphasis>sticky + sessions + </emphasis> + in HTTP session replication speak. What this means + is that if certain data is frequently accessed, it is desirable that + this is always accessed on one instance rather than in a round-robin + fashion as this helps the cache cluster optimize how it chooses + buddies, where it stores data, and minimizes replication + traffic. + </para> + + <para>If this is not possible, Buddy Replication may prove to be more + of an overhead than a benefit. + </para> + + <section> + <title>Selecting Buddies</title> + + <figure> + <title>BuddyLocator</title> + + <mediaobject> + <imageobject> + <imagedata fileref="BuddyReplication.png"/> + </imageobject> + </mediaobject> + </figure> + + <para>Buddy Replication uses an instance of a + <literal>BuddyLocator</literal> + which contains the logic used to + select buddies in a network. JBoss Cache currently ships with a + single implementation, + <literal>NextMemberBuddyLocator</literal> + , + which is used as a default if no implementation is provided. The + <literal>NextMemberBuddyLocator</literal> + selects the next member in + the cluster, as the name suggests, and guarantees an even spread of + buddies for each instance. + </para> + + <para>The + <literal>NextMemberBuddyLocator</literal> + takes in 2 + parameters, both optional. + <itemizedlist> + <listitem> + + + <literal>numBuddies</literal> + + - specifies how many buddies each instance should pick to back its data onto. This defaults to + 1. + </listitem> + + <listitem> + + + <literal>ignoreColocatedBuddies</literal> + + - means that each instance will + + <emphasis>try</emphasis> + + to select a buddy on a different physical host. If not able to do so though, it will fall back + to co-located instances. This defaults to + + <literal>true</literal> + + . + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>BuddyPools</title> + + <para>Also known as + <emphasis>replication groups</emphasis> + , a buddy + pool is an optional construct where each instance in a cluster may + be configured with a buddy pool name. Think of this as an 'exclusive + club membership' where when selecting buddies, + <literal>BuddyLocator</literal> + s that support buddy pools would try + and select buddies sharing the same buddy pool name. This allows + system administrators a degree of flexibility and control over how + buddies are selected. For example, a sysadmin may put two instances + on two separate physical servers that may be on two separate + physical racks in the same buddy pool. So rather than picking an + instance on a different host on the same rack, + <literal>BuddyLocator</literal> + s would rather pick the instance in + the same buddy pool, on a separate rack which may add a degree of + redundancy. + </para> + </section> + + <section> + <title>Failover</title> + + <para>In the unfortunate event of an instance crashing, it is + assumed that the client connecting to the cache (directly or + indirectly, via some other service such as HTTP session replication) + is able to redirect the request to any other random cache instance + in the cluster. This is where a concept of Data Gravitation comes + in. + </para> + + <para>Data Gravitation is a concept where if a request is made on a + cache in the cluster and the cache does not contain this + information, it asks other instances in the cluster for the + data. In other words, data is lazily transferred, migrating + <emphasis>only</emphasis> + when other nodes ask for it. This strategy + prevents a network storm effect where lots of data is pushed around + healthy nodes because only one (or a few) of them die. + </para> + + <para>If the data is not found in the primary section of some node, + it would (optionally) ask other instances to check in the backup + data they store for other caches. + This means that even if a cache containing your session dies, other + instances will still be able to access this data by asking the cluster + to search through their backups for this data. + </para> + + <para>Once located, this data is transferred to the instance + which requested it and is added to this instance's data tree. + The data is then (optionally) removed from all other instances + (and backups) so that if session affinity is used, the affinity + should now be to this new cache instance which has just + <emphasis>taken + ownership + </emphasis> + of this data. + </para> + + <para>Data Gravitation is implemented as an interceptor. The + following (all optional) configuration properties pertain to data + gravitation. + <itemizedlist> + <listitem> + + + <literal>dataGravitationRemoveOnFind</literal> + + - forces all remote caches that own the data or hold backups for the data to remove that data, + thereby making the requesting cache the new data owner. This removal, of course, only happens + after the new owner finishes replicating data to its buddy. If set to + + <literal>false</literal> + + an evict is broadcast instead of a remove, so any state persisted in cache loaders will remain. + This is useful if you have a shared cache loader configured. Defaults to + + <literal>true</literal> + + . + </listitem> + + <listitem> + + + <literal>dataGravitationSearchBackupTrees</literal> + + - Asks remote instances to search through their backups as well as main data trees. Defaults to + + <literal>true</literal> + + . The resulting effect is that if this is + + <literal>true</literal> + + then backup nodes can respond to data gravitation requests in addition to data owners. + </listitem> + + <listitem> + + + <literal>autoDataGravitation</literal> + + - Whether data gravitation occurs for every cache miss. By default this is set to + + <literal>false</literal> + + to prevent unnecessary network calls. Most use cases will know when it may need to gravitate + data and will pass in an + + <literal>Option</literal> + + to enable data gravitation on a per-invocation basis. If + + <literal>autoDataGravitation</literal> + + is + + <literal>true</literal> + + this + + <literal>Option</literal> + + is unnecessary. + </listitem> + </itemizedlist> + </para> + </section> + + <section> + <title>Configuration</title> + + See the <link linkend="configuration_reference_chapter">configuration reference section</link> for details on configuring buddy replication. + </section> + </section> + </section> + </section> + + <section> + <title>Invalidation</title> + + <para>If a cache is configured for invalidation rather than replication, + every time data is changed in a cache other caches in the cluster receive + a message informing them that their data is now stale and should be + evicted from memory. Invalidation, when used with a shared cache loader + (see chapter on <link linkend="cache_loaders">cache loaders</link>) would cause remote caches to refer to the + shared cache loader to retrieve modified data. The benefit of this is + twofold: network traffic is minimized as invalidation messages are very + small compared to replicating updated data, and also that other caches in + the cluster look up modified data in a lazy manner, only when + needed. + </para> + + <para>Invalidation messages are sent after each modification (no + transactions or batches), or at the end of a transaction or batch, upon successful commit. + This is usually more efficient as invalidation messages can be optimized + for the transaction as a whole rather than on a per-modification + basis. + </para> + + <para>Invalidation too can be synchronous or asynchronous, and just as in + the case of replication, synchronous invalidation blocks until all caches + in the cluster receive invalidation messages and have evicted stale data + while asynchronous invalidation works in a 'fire-and-forget' mode, where + invalidation messages are broadcast but doesn't block and wait for + responses. + </para> + </section> + + <section> + <title>State Transfer</title> + + <para> + <emphasis>State Transfer</emphasis> + refers to the process by which a + JBoss Cache instance prepares itself to begin providing a service by + acquiring the current state from another cache instance and integrating + that state into its own state. + </para> + + <section> + <title>State Transfer Types</title> + + <para>There are three divisions of state transfer types depending on a + point of view related to state transfer. First, in the context of + particular state transfer implementation, the underlying plumbing, there + are two starkly different state transfer types: byte array and streaming + based state transfer. Second, state transfer can be full or partial + state transfer depending on a subtree being transferred. Entire cache + tree transfer represents full transfer while transfer of a particular + subtree represents partial state transfer. And finally state transfer + can be "in-memory" and "persistent" transfer depending on a particular + use of cache. + </para> + </section> + + <section> + <title>Byte array and streaming based state transfer</title> + + <para>Byte array based transfer was a default and only transfer + methodology for cache in all previous releases up to 2.0. Byte array + based transfer loads entire state transferred into a byte array and + sends it to a state receiving member. Major limitation of this approach + is that the state transfer that is very large (>1GB) would likely + result in OutOfMemoryException. Streaming state transfer provides an + InputStream to a state reader and an OutputStream to a state writer. + OutputStream and InputStream abstractions enable state transfer in byte + chunks thus resulting in smaller memory requirements. For example, if + application state is represented as a tree whose aggregate size is 1GB, + rather than having to provide a 1GB byte array streaming state transfer + transfers the state in chunks of N bytes where N is user + configurable. + </para> + + <para>Byte array and streaming based state transfer are completely API + transparent, interchangeable, and statically configured through a + standard cache configuration XML file. Refer to JGroups documentation on + how to change from one type of transfer to another. + </para> + </section> + + <section> + <title>Full and partial state transfer</title> + + <para>If either in-memory or persistent state transfer is enabled, a + full or partial state transfer will be done at various times, depending + on how the cache is used. "Full" state transfer refers to the transfer + of the state related to the entire tree -- i.e. the root node and all + nodes below it. A "partial" state transfer is one where just a portion + of the tree is transferred -- i.e. a node at a given Fqn and all nodes + below it. + </para> + + <para>If either in-memory or persistent state transfer is enabled, state + transfer will occur at the following times: + </para> + + <orderedlist> + <listitem> + <para>Initial state transfer. This occurs when the cache is first + started (as part of the processing of the + <literal>start()</literal> + method). This is a full state transfer. The state is retrieved from + the cache instance that has been operational the longest. + <footnote> + <para>The longest operating cache instance is always, in JGroups + terms, the coordinator. + </para> + </footnote> + If there is any problem receiving or integrating the state, the cache + will not start. + </para> + + <para>Initial state transfer will occur unless:</para> + + <orderedlist> + <listitem> + <para>The cache's + <literal>InactiveOnStartup</literal> + property + is + <literal>true</literal> + . This property is used in + conjunction with region-based marshalling. + </para> + </listitem> + + <listitem> + <para>Buddy replication is used. See below for more on state + transfer with buddy replication. + </para> + </listitem> + </orderedlist> + </listitem> + + <listitem> + <para>Partial state transfer following region activation. When + region-based marshalling is used, the application needs to register + a specific class loader with the cache. This class loader is used + to unmarshall the state for a specific region (subtree) of the cache. + </para> + + <para>After registration, the application calls + <literal>cache.getRegion(fqn, true).activate()</literal> + , + which initiates a partial state transfer of the relevant subtree's + state. The request is first made to the oldest cache instance in the + cluster. However, if that instance responds with no state, it is then + requested from each instance in turn until one either provides state + or all instances have been queried. + </para> + + <para>Typically when region-based marshalling is used, the cache's + <literal>InactiveOnStartup</literal> + property is set to + <literal>true</literal> + . This suppresses initial state transfer, + which would fail due to the inability to deserialize the transferred + state. + </para> + </listitem> + + <listitem> + <para>Buddy replication. When buddy replication is used, initial + state transfer is disabled. Instead, when a cache instance joins the + cluster, it becomes the buddy of one or more other instances, and + one or more other instances become its buddy. Each time an instance + determines it has a new buddy providing backup for it, it pushes + its current state to the new buddy. This "pushing" of state to the + new buddy is slightly different from other forms of state transfer, + which are based on a "pull" approach (i.e. recipient asks for and + receives state). However, the process of preparing and integrating + the state is the same. + </para> + + <para>This "push" of state upon buddy group formation only occurs if + the + <literal>InactiveOnStartup</literal> + property is set to + <literal>false</literal> + . If it is + <literal>true</literal> + , state + transfer amongst the buddies only occurs when the application + activates the region on the various members of the group. + </para> + + <para>Partial state transfer following a region activation call is + slightly different in the buddy replication case as well. Instead of + requesting the partial state from one cache instance, and trying all + instances until one responds, with buddy replication the instance + that is activating a region will request partial state from each + instance for which it is serving as a backup. + </para> + </listitem> + </orderedlist> + </section> + + <section> + <title>Transient ("in-memory") and persistent state transfer</title> + + <para>The state that is acquired and integrated can consist of two basic + types: + </para> + + <orderedlist> + <listitem> + <para>"Transient" or "in-memory" state. This consists of the actual + in-memory state of another cache instance - the contents of the + various in-memory nodes in the cache that is providing state are + serialized and transferred; the recipient deserializes the data, + creates corresponding nodes in its own in-memory tree, and populates + them with the transferred data. + </para> + + <para>"In-memory" state transfer is enabled by setting the cache's + <literal>FetchInMemoryState</literal> + configuration attribute to + <literal>true</literal> + . + </para> + </listitem> + + <listitem> + <para>"Persistent" state. Only applicable if a non-shared cache + loader is used. The state stored in the state-provider cache's + persistent store is deserialized and transferred; the recipient + passes the data to its own cache loader, which persists it to the + recipient's persistent store. + </para> + + <para>"Persistent" state transfer is enabled by setting a cache + loader's + <literal>fetchPersistentState</literal> + attribute to + <literal>true</literal> + . If multiple cache loaders are configured + in a chain, only one can have this property set to true; otherwise + you will get an exception at startup. + </para> + + <para>Persistent state transfer with a shared cache loader does not + make sense, as the same persistent store that provides the data will + just end up receiving it. Therefore, if a shared cache loader is + used, the cache will not allow a persistent state transfer even if a + cache loader has + <literal>fetchPersistentState</literal> + set to + <literal>true</literal> + . + </para> + </listitem> + </orderedlist> + + <para>Which of these types of state transfer is appropriate depends on + the usage of the cache. + </para> + + <orderedlist> + <listitem> + <para>If a write-through cache loader is used, the current cache + state is fully represented by the persistent state. Data may have + been evicted from the in-memory state, but it will still be in the + persistent store. In this case, if the cache loader is not shared, + persistent state transfer is used to ensure the new cache has the + correct state. In-memory state can be transferred as well if the + desire is to have a "hot" cache -- one that has all relevant data in + memory when the cache begins providing service. (Note that the + <literal><![CDATA[<preload>]]></literal> + element in the + <literal><![CDATA[<loaders>]]></literal> + configuration element can be used as well to + provide a "warm" or "hot" cache without requiring an in-memory state + transfer. This approach somewhat reduces the burden on the cache + instance providing state, but increases the load on the persistent + store on the recipient side.) + </para> + </listitem> + + <listitem> + <para>If a cache loader is used with passivation, the full + representation of the state can only be obtained by combining the + in-memory (i.e. non-passivated) and persistent (i.e. passivated) + states. Therefore an in-memory state transfer is necessary. A + persistent state transfer is necessary if the cache loader is not + shared. + </para> + </listitem> + + <listitem> + <para>If no cache loader is used and the cache is solely a + write-aside cache (i.e. one that is used to cache data that can also + be found in a persistent store, e.g. a database), whether or not + in-memory state should be transferred depends on whether or not a + "hot" cache is desired. + </para> + </listitem> + </orderedlist> + </section> + + <section> + <title>Non-Blocking State Transfer</title> + <para> + New in JBoss Cache 3.1.0, Non-Blocking State Transfer (NBST) allows senders to generate and stream state while + not stopping handling their "work as usual" transactions. This is particularly important if there is a large + volume of state, where generation and streaming of the state can take some time and can cause ongoing + transactions on the sender to time out and fail. + </para> + <para> + To achieve this, NBST should be enabled (see + configuration reference), and you need to be using MVCC as a node locking scheme. In addition, you need to + use JGroups' STREAMING_STATE_TRANSFER protocol in your cluster properties. + </para> + </section> + + <section> + <title>Configuring State Transfer</title> + <para> + To ensure state transfer behaves as expected, it is important that all nodes in the cluster are configured + with + the same settings for persistent and transient state. This is because byte array based transfers, when + requested, + rely only on the requester's configuration while stream based transfers rely on both the requester and + sender's + configuration, and this is expected to be identical. + </para> + </section> + </section> +</chapter> Added: enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/transactions.xml =================================================================== --- enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/transactions.xml (rev 0) +++ enterprise-docs/tags/JBoss_EAP_5_0_0/Cache_User_Guide/en-US/transactions.xml 2009-08-03 23:55:06 UTC (rev 8146) @@ -0,0 +1,234 @@ +<chapter id="transactions"> + <title>Transactions and Concurrency</title> + <section id="transactions.concurrent"> + <title>Concurrent Access</title> + + <para>JBoss Cache is a thread safe caching API, and uses its own efficient mechanisms of controlling concurrent + access. It uses an innovative implementation of multi-versioned concurrency control + (<ulink url="http://en.wikipedia.org/wiki/Multiversion_concurrency_control">MVCC</ulink>) as the default + locking scheme. Versions of JBoss Cache prior to 3.x offered Optimistic and Pessimistic Locking schemes, + both of which are now deprecated in favor of MVCC. + </para> + + <section id="transactions.locks.mvcc"> + <title>Multi-Version Concurrency Control (MVCC)</title> + <para> + <ulink url="http://en.wikipedia.org/wiki/Multiversion_concurrency_control">MVCC</ulink> is a locking scheme + commonly used by modern database implementations to control fast, safe concurrent access to shared data. + </para> + <section id="mvcc.concepts"> + <title>MVCC Concepts</title> + <para> + MVCC is designed to provide the following features for concurrent access: + <itemizedlist> + <listitem>Readers that don't block writers</listitem> + <listitem>Writers that fail fast</listitem> + </itemizedlist> + and achieves this by using data versioning and copying for concurrent writers. The theory is that readers + continue reading shared state, while writers copy the shared state, increment a version id, and write that + shared state back after verifying that the version is still valid (i.e., another concurrent writer has not + changed this state first). + </para> + <para> + This allows readers to continue reading while not preventing writers from writing, and repeatable read + semantics are maintained by allowing readers to read off the old version of the state. + </para> + </section> + <section id="mvcc.impl"> + <title>MVCC Implementation</title> + <para> + JBoss Cache's implementation of MVCC is based on a few features: + <itemizedlist> + <listitem>Readers don't acquire any locks</listitem> + <listitem>Only one additional version is maintained for shared state, for a single writer</listitem> + <listitem>All writes happen sequentially, to provide fail-fast semantics</listitem> + </itemizedlist> + The extremely high performance of JBoss Cache's MVCC implementation for reading threads is achieved by + not requiring any synchronization or locking for readers. For each reader thread, the + <literal>MVCCLockingInterceptor</literal> wraps state in a lightweight container object, which is placed + in the thread's <literal>InvocationContext</literal> (or <literal>TransactionContext</literal> if running + in a transaction). All subsequent operations on the state happens via the container object. This use of + Java references allows for repeatable read semantics even if the actual state changes simultaneously. + </para> + <para> + Writer threads, on the other hand, need to acquire a lock before any writing can commence. Currently, + we use lock striping to improve the memory performance of the cache, and the size of the shared lock pool + can be tuned using the <literal>concurrencyLevel</literal> attribute of the <literal>locking</literal> + element. See the <link linkend="configuration_reference_chapter">configuration reference</link> + for details. After acquiring an exclusive lock on an Fqn, the writer thread then wraps the state to be + modified in a container as well, just like with reader threads, and then copies this state for writing. + When copying, a reference to the original version is still maintained in the container (for rollbacks). + Changes are then made to the copy and the copy is finally written to the data structure when the write + completes. + </para> + <para> + This way, subsequent readers see the new version while existing readers still hold a reference to the + original version in their context. + </para> + <para> + If a writer is unable to acquire the write lock after some time, a <literal>TimeoutException</literal> is + thrown. This lock acquisition timeout defaults to 10000 millis and can be configured using the + <literal>lockAcquisitionTimeout</literal> attribute of the <literal>locking</literal> element. See the + <link linkend="configuration_reference_chapter">configuration reference</link> for details. + </para> + <section id="mvcc.iso"> + <title>Isolation Levels</title> + <para> + JBoss Cache 3.x supports two isolation levels: REPEATABLE_READ and READ_COMMITTED, which correspond + in semantic to <ulink url="http://en.wikipedia.org/wiki/Isolation_level">database-style isolation levels</ulink>. + Previous versions of JBoss Cache supported all 5 database isolation levels, and if an unsupported + isolation level is configured, it is either upgraded or downgraded to the closest supported level. + </para> + <para> + REPEATABLE_READ is the default isolation level, to maintain compatibility with previous versions of + JBoss Cache. READ_COMMITTED, while providing a slightly weaker isolation, has a significant + performance benefit over REPEATABLE_READ. + </para> + </section> + <section id="mvcc.writeskew"> + <title>Concurrent Writers and Write-Skews</title> + <para> + Although MVCC forces writers to obtain a write lock, a phenomenon known as write skews may occur when + using REPEATABLE_READ: + </para> + <mediaobject> + <imageobject> + <imagedata fileref="writeskew.png" format="PNG"/> + </imageobject> + </mediaobject> + <para> + This happens when concurrent transactions performing a read and then a write, based on the value that + was read. Since reads involve holding on to the reference to the state in the + transaction context, a subsequent write would work off that original state read, which may now be stale. + </para> + <para> + The default behavior with dealing with a write skew is to throw a <literal>DataVersioningException</literal>, + when it is detected when copying state for writing. However, in most applications, a write skew may not + be an issue (for example, if the state written has no relationship to the state originally read) and + should be allowed. If your application does not care about write skews, you can allow them to happen + by setting the <literal>writeSkewCheck</literal> configuration attribute to <literal>false</literal>. + See the <link linkend="configuration_reference_chapter">configuration reference</link> for details. + </para> + <para> + Note that write skews cannot happen when using READ_COMMITTED since threads always work off committed + state. + </para> + </section> + </section> + <section id="mvcc.cfg"> + <title>Configuring Locking</title> + <para> + Configuring MVCC involves using the <literal><![CDATA[<locking /> ]]></literal> configuration tag, as follows: + </para> + <programlisting role="XML"><![CDATA[ + <locking + isolationLevel="REPEATABLE_READ" + lockAcquisitionTimeout="10234" + nodeLockingScheme="mvcc" + writeSkewCheck="false" + concurrencyLevel="1000" /> + ]]></programlisting> + + <para> + <itemizedlist> + <listitem><literal>nodeLockingScheme</literal> - the node locking scheme used. Defaults to MVCC if + not provided, deprecated schemes such as <literal>pessimistic</literal> or <literal>optimistic</literal> + may be used but is not encouraged.</listitem> + <listitem><literal>isolationLevel</literal> - transaction isolation level. Defaults to REPEATABLE_READ if not provided.</listitem> + <listitem><literal>writeSkewCheck</literal> - defaults to <literal>true</literal> if not provided.</listitem> + <listitem><literal>concurrencyLevel</literal> - defaults to 500 if not provided.</listitem> + <listitem><literal>lockAcquisitionTimeout</literal> - only applies to writers when using MVCC. Defaults to 10000 if not provided.</listitem> + </itemizedlist> + </para> + </section> + </section> + + <section id="transactions.locks.dep"> + <title>Pessimistic and Optimistic Locking Schemes</title> + <para> + From JBoss Cache 3.x onwards, pessimistic and optimistic locking schemes are deprecated in favor of + <link linkend="transactions.locks.mvcc">MVCC</link>. It is recommended that existing applications + move off these legacy locking schemes as support for them will eventually be dropped altogether in future + releases. + </para> + <para> + Documentation for legacy locking schemes are not included in this user guide, and if necessary, can be + referenced in previous versions of this document, which can be found on + <ulink url="http://www.jboss.org/jbosscache">the JBoss Cache website</ulink>. + </para> + </section> + </section> + + + <section id="transactions.jta"> + <title>JTA Support</title> + + <para>JBoss Cache can be configured to use and participate in + <ulink url="http://java.sun.com/javaee/technologies/jta/">JTA</ulink> compliant transactions. Alternatively, if + transaction support is disabled, it is equivalent to using autocommit in JDBC calls, where + modifications are potentially replicated after every change (if replication is enabled). + </para> + + <para>What JBoss Cache does on every incoming call is:</para> + <orderedlist> + <listitem> + <para>Retrieve the current + <literal>javax.transaction.Transaction</literal> associated with the thread + </para> + </listitem> + <listitem> + <para>If not already done, register a + <literal>javax.transaction.Synchronization</literal> + with the transaction manager to be notified when a transaction commits + or is rolled back. + </para> + </listitem> + </orderedlist> + <para> + In order to do this, the cache has to be provided with a reference to environment's + <literal>javax.transaction.TransactionManager</literal>. This is usually done by configuring the cache + with the class name of an implementation of the <literal>TransactionManagerLookup</literal> + interface. When the cache starts, it will create an instance of this class and invoke its + <literal>getTransactionManager()</literal> method, which returns a reference to the + <literal>TransactionManager</literal>. + </para> + + <mediaobject> + <imageobject> + <imagedata fileref="TransactionLookup.png" format="PNG"/> + </imageobject> + </mediaobject> + + <para>JBoss Cache ships with + <literal>JBossTransactionManagerLookup</literal> and <literal>GenericTransactionManagerLookup</literal>. The + <literal>JBossTransactionManagerLookup</literal> is able to bind to a running JBoss AS instance and retrieve a + <literal>TransactionManager</literal> while the <literal>GenericTransactionManagerLookup</literal> + is able to bind to most popular Java EE application servers and provide the same functionality. A dummy + implementation - <literal>DummyTransactionManagerLookup</literal> - is also provided for unit tests. Being a + dummy, this is not recommended for production use a it has some severe limitations to do with concurrent + transactions and recovery. + </para> + + <para> + An alternative to configuring a <literal>TransactionManagerLookup</literal> is to programatically inject a + reference to the <literal>TransactionManager</literal> into the <literal>Configuration</literal> object's + <literal>RuntimeConfig</literal> element: + </para> + + <programlisting role="JAVA"><![CDATA[ + TransactionManager tm = getTransactionManager(); // magic method + cache.getConfiguration().getRuntimeConfig().setTransactionManager(tm); + ]]></programlisting> + + <para> + Injecting the <literal>TransactionManager</literal> is the recommended approach when the + <literal>Configuration</literal> is built by some sort of IOC container that already has a reference to the + <literal>TransactionManager</literal>. + </para> + + <para>When the transaction commits, we initiate either a one- two-phase commit + protocol. See <link linkend="replication.tx">replicated caches and transactions</link> for details. + </para> + + </section> +</chapter>

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