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CacheLoader store not recreating keys/values
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created by <a href="http://community.jboss.org/people/jaysmith">jaysmith</a> in <i>JBoss Cache</i> - <a href="http://community.jboss.org/message/599443#599443">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi there,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a simple proof of concept JUnit that creates a cache, creates a node, creates a test object and adds this object to the node.  The cache is configured with a FileCacheLoader, passivation disabled and eviction happens after 2 seconds.</p><p>What I would expect to see is that when the object is added to the node, both RAM and disk are written to, after 2 seconds then memory should be cleared. After that time, a read should load the node and the object that the node contains back into memory.</p><p>However, what I'm actually seeing is different. After 2 seconds has elapsed and the node has been evicted from RAM, a read recreates the node from the persistent store but it is empty i.e. the object that the node orginally stored is no longer there.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My configuration:</p><p><?xml version="1.0" encoding="UTF-8"?></p><p><jbosscache xmlns:xsi="<a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>" xmlns="urn:jboss:jbosscache-core:config:3.2"></p><p><br/>   <!--<br/>      isolation levels supported: READ_COMMITTED and REPEATABLE_READ<br/>      nodeLockingSchemes: mvcc, pessimistic (deprecated), optimistic (deprecated)<br/>   --><br/>   <locking<br/>         isolationLevel="REPEATABLE_READ"<br/>         lockParentForChildInsertRemove="false"<br/>         lockAcquisitionTimeout="20000"<br/>         nodeLockingScheme="mvcc"<br/>         writeSkewCheck="false"<br/>         useLockStriping="true"<br/>         concurrencyLevel="500"/></p><p>   <!--<br/>      Used to register a transaction manager and participate in ongoing transactions.<br/>      --><br/>   <transaction<br/>         transactionManagerLookupClass="org.jboss.cache.transaction.GenericTransactionManagerLookup"<br/>         syncRollbackPhase="false"<br/>         syncCommitPhase="false"/></p><p>   <!--<br/>      Used to register JMX statistics in any available MBean server<br/>      --><br/>   <jmxStatistics enabled="false"/></p><p>   <!--<br/>      If region based marshalling is used, defines whether new regions are inactive on startup.<br/>   --><br/>   <startup regionsInactiveOnStartup="true"/></p><p>   <!--<br/>      Used to register JVM shutdown hooks.<br/>      hookBehavior: DEFAULT, REGISTER, DONT_REGISTER<br/>   --><br/>   <shutdown hookBehavior="DEFAULT"/></p><p>   <!--<br/>      Used to define async listener notification thread pool size<br/>   --><br/>   <listeners asyncPoolSize="1" asyncQueueSize="100000"/></p><p>   <!--<br/>      Used to enable invocation batching and allow the use of Cache.startBatch()/endBatch() methods.<br/>   --><br/>   <invocationBatching enabled="false"/></p><p>   <!--<br/>      serialization related configuration, used for replication and cache loading<br/>   --><br/>   <serialization objectInputStreamPoolSize="12" objectOutputStreamPoolSize="14" version="3.0.0"<br/>         marshallerClass="org.jboss.cache.marshall.VersionAwareMarshaller" useLazyDeserialization="false"<br/>         useRegionBasedMarshalling="false"/></p><p>   <!--<br/>      Eviction configuration.  WakeupInterval defines how often the eviction thread runs, in milliseconds.  0 means<br/>      the eviction thread will never run.<br/>   --><br/>   <eviction wakeUpInterval="500"><br/>      <default algorithmClass="org.jboss.cache.eviction.LRUAlgorithm" eventQueueSize="200000"><br/>         <property name="maxNodes" value="5000" /><br/>         <property name="timeToLive" value="1000" /><br/>      </default><br/>      <region name="/griffin_peter"><br/>         <property name="timeToLive" value="2000" /><br/>         <!--<property name="maxAge" value="10000" />--><br/>      </region><br/>      <region name="/org/jboss/data2" algorithmClass="org.jboss.cache.eviction.FIFOAlgorithm" eventQueueSize="100000"><br/>         <property name="maxNodes" value="3000" /><br/>         <property name="minTimeToLive" value="4000" /><br/>      </region><br/>   </eviction></p><p>   <!--<br/>      Cache loaders.</p><p>      If passivation is enabled, state is offloaded to the cache loaders ONLY when evicted.  Similarly, when the state<br/>      is accessed again, it is removed from the cache loader and loaded into memory.</p><p>      Otherwise, state is always maintained in the cache loader as well as in memory.</p><p>      Set 'shared' to true if all instances in the cluster use the same cache loader instance, e.g., are talking to the<br/>      same database.<br/>   --><br/>   <loaders passivation="false" shared="false"><br/>      <preload><br/>         <node fqn="/griffin_peter"/><br/>      </preload></p><p>      <loader class="org.jboss.cache.loader.FileCacheLoader" async="true" fetchPersistentState="true"<br/>              ignoreModifications="false" purgeOnStartup="true"><br/>         <properties><br/>            check.character.portability=false<br/>            location=/web/dev/jboss-cache<br/>         </properties><br/>         <singletonStore enabled="false" class="org.jboss.cache.loader.SingletonStoreCacheLoader"><br/>            <properties><br/>               pushStateWhenCoordinator=true<br/>               pushStateWhenCoordinatorTimeout=20000<br/>            </properties><br/>         </singletonStore><br/>      </loader><br/>   </loaders><br/></jbosscache></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is the code I have (based on code in JBoss Cache User Guide 3.x.x)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package tests.cache.loader;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.jboss.cache.Cache;<br/>import org.jboss.cache.CacheFactory;<br/>import org.jboss.cache.DefaultCacheFactory;<br/>import org.jboss.cache.Fqn;<br/>import org.jboss.cache.Node;</p><p>import org.junit.AfterClass;<br/>import org.junit.BeforeClass;<br/>import org.junit.Test;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class CustomCacheLoaderTest {<br/>    /** cache. */<br/>    private static Cache<String, Object> cache = null;</p><p>    class TestTO {<br/>        private String field1;<br/>        public String toString() {<br/>            return this.getClass().getSimpleName() + ": field1=" + field1;<br/>        }<br/>    }</p><p>    @AfterClass<br/>    public final static void afterClass() throws Exception {<br/>        cache.stop();<br/>        cache.destroy();<br/>        cache = null;<br/>    }</p><p>    @BeforeClass<br/>    public final static void beforeClass() throws Exception {<br/>        CacheFactory cacheFactory = new DefaultCacheFactory();<br/>        cache = cacheFactory.createCache("jboss-cache-configuration.xml");<br/>        cache.create();<br/>        cache.start();<br/>    }</p><p>    @Test<br/>    public final void put() throws Exception {<br/>        Object listener = new CustomCacheListener();<br/>        cache.addCacheListener(listener);<br/>        Node rootNode = cache.getRoot();<br/>        Fqn peterGriffinFqn = Fqn.fromString("/griffin_peter");<br/>        Node peterGriffinNode = rootNode.addChild(peterGriffinFqn);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        TestTO testTO = new TestTO();<br/>        testTO.field1 = "This is a test string!";<br/>        peterGriffinNode.put("testTO", testTO);<br/>        System.out.println("Fqn: /griffin_peter: Key=testTO; Value="<br/>                + cache.get("/griffin_peter", "testTO"));</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        System.out.println("\nWaiting for 4000 milliseconds ...");<br/>        Thread.sleep(4000);<br/>        java.util.Map data = cache.getData(Fqn.fromString("/griffin_peter"));<br/>        System.out.println("data.size()=" + data.size());<br/>        System.out.println("Fqn: /griffin_peter: Key=testTO; Value="<br/>                + cache.get("/griffin_peter", "testTO"));<br/>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>this outputs:</p><p><span style="font-size: 10pt;"><p align="left">Fqn: /griffin_peter: Key=testTO; Value=TestTO: field1=This is a test string!</p><p align="left" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p align="left">Waiting for 4000 milliseconds ...</p><p align="left">data.size()=0</p></span></p><p>Fqn: /griffin_peter: Key=testTO; Value=null</p><p><span style="font-size: 10pt;"></span></p><p><span style="font-size: 10pt;"></span>When I plug a Cache Listener in, the output is:</p><p><span style="font-size: 10pt;"></span><span style="font-size: 10pt;">09:04:07.678 [CustomCacheListener] Created node: /griffin_peter<p><p align="left">09:04:07.803 [CustomCacheListener] Created node: /griffin_peter</p><p align="left">09:04:07.819 [CustomCacheListener] Visited node: /griffin_peter</p><p align="left">09:04:07.819 [CustomCacheListener] Visited node: /griffin_peter</p><p align="left">Fqn: /griffin_peter: Key=testTO; Value=TestTO: field1=This is a test string!</p><p align="left" style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p align="left">Waiting for 4000 milliseconds ...</p><p align="left">09:04:09.866 [CustomCacheListener] Evicted node: /griffin_peter</p><p align="left">09:04:09.866 [CustomCacheListener] Evicted node: /griffin_peter</p><p align="left">09:04:11.819 [CustomCacheListener] Created node: /griffin_peter</p><p align="left">09:04:11.819 [CustomCacheListener] Created node: /griffin_peter</p><p align="left">data.size()=0</p><p align="left">09:04:11.819 [CustomCacheListener] Visited node: /griffin_peter</p><p align="left">09:04:11.819 [CustomCacheListener] Visited node: /griffin_peter</p></p><p align="left">Fqn: /griffin_peter: Key=testTO; Value=null</p><p align="left"><span style="font-size: 10pt;"></span></p></span></p><p align="left"><span style="font-size: 10pt;"></span>So, the RAM is evicted at 09:04:09.866, node is recreated from backend store at 09:04:11.819 but the value for key testTO is null when it should be a TestTO object with field1 populated.</p><p align="left"><span style="font-size: 10pt;"></span></p><p align="left"><span style="font-size: 10pt;"></span>Any ideas why the backend store isn't storing keys and values?</p></div>
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