[jboss-dev-forums] [Design of JBoss ESB] - Re: PropertyManager

[mark.little@jboss.com]

Here's an updated config file:


  | <?xml version="1.0" encoding="ISO-8859-1"?>
  | <!--
  |   JBoss, Home of Professional Open Source
  |   Copyright 2006, JBoss Inc., and others contributors as indicated 
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  |   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
  |   MA  02110-1301, USA.
  |   
  |   (C) 2005-2006,
  |   @author JBoss Inc.
  | -->
  | <!-- $Id: default-jbossesb-properties.xml $ -->
  | <!--
  |   These options are described in the JBossESB manual.
  |   Defaults are provided here for convenience only.
  |  
  |   Please read through this file prior to using the system, and consider
  |   updating the specified entries.
  | -->
  | <esb
  |   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  |   xsi:noNamespaceSchemaLocation="jbossesb-1_0.xsd">
  |     <properties name="core">
  | 		<property name="org.jboss.soa.esb.jndi.server.type" value="jboss"/>
  | 		<property name="org.jboss.soa.esb.jndi.server.url" value="localhost"/>
  | 		<!-- property name="org.jboss.soa.esb.paramsRepository.class" value="" -->
  | 		<!-- property name="org.jboss.soa.esb.encryption.factory.class" value="" -->
  | 		<!-- property name="org.jboss.soa.esb.objStore.configFile" value="" -->
  |     </properties>
  |     <properties name="transports" depends="core">
  |     	<property name="org.jboss.soa.esb.mail.smtp.host" value="localhost"/>
  |     	<property name="org.jboss.soa.esb.mail.smtp.user" value=""/>
  |     	<property name="org.jboss.soa.esb.mail.smtp.password" value=""/>
  |     	<property name="org.jboss.soa.esb.mail.smtp.port" value="25"/>
  |     	<!--  property name="org.jboss.soa.esb.mail.smtp.from" value="" -->
  |     	<!--  property name="org.jboss.soa.esb.mail.smtp.auth" value="" -->
  |     </properties>
  |     <properties name="connection">
  |     	<!-- property name="isolation" value="" -->
  |     	<!-- property name="connection-url" value="" -->
  |     	<property name="min-pool-size" value="5"/>
  |     	<property name="max-pool=size" value="10"/>
  |     	<property name="blocking-timeout-millis" value="5000"/>
  |     	<!-- property name="connection-pool-class" value="" -->
  |     	<!-- property name="user-name" value="" -->
  |     	<!-- property name="password" value="" -->
  |     	<!-- property name"password-decrypter" value="" -->
  |     	<property name="abandoned-connection-timeout" value="10000"/>
  |     	<property name="abandoned-connection-time-interval" value="30000"/>
  |     </properties>
  | </esb>
  | 

I've broken the properties into different modules, with associated dependencies. The way the PropertyManager works means that it builds up a list of dependant modules in a directed acyclic graph. This means that there is a root, which can see every property below it, but nodes below cannot see properties above them: there is a level of isolation.

When creating PropertyManagers, you need to specify where in the graph it is to "tie in". This obviously has an affect on what that instance can then see or do: if it goes in at the wrong level, it won't be able to see properties it may need (unless they were defined to be "system" properties, and in which case they are globally accessible.)

This means that we now have isolated PropertyManagers for each module. It helps the management side of things a lot, but does mean that we have to consider where in the graph a property needs to be, or which PropertyManager we want to use to try to access it.

What we have at the moment in terms of properties is pretty basic, so this 3 module approach seems about right to me. I'll check the code in now (along with some tests!) and we can discuss the structuring tomorrow. It's fairly trivial to change.

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