[jboss-jira] [JBoss JIRA] Created: (JBCACHE-1149) FIFOPolicy is adding a visited node to the evictionqueue

[Maddulety Vankadara (JIRA)]

FIFOPolicy is adding a visited node to the evictionqueue
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                 Key: JBCACHE-1149
                 URL: http://jira.jboss.com/jira/browse/JBCACHE-1149
             Project: JBoss Cache
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Eviction
    Affects Versions: 2.0.0.CR2
         Environment: OS: WIn XP SP2; JBOSS AS: 4.0.3; Cache : 2.0.0CR2
            Reporter: Maddulety Vankadara
         Assigned To: Manik Surtani


Created Eviction Policy with the following config:

      <attribute name="EvictionPolicyConfig">
         <config>
            <attribute name="wakeUpIntervalSeconds">30</attribute>
            <attribute name="eventQueueSize">200000</attribute>

            <!-- Cache wide default -->
            <region name="/_default_" policyClass="org.jboss.cache.eviction.FIFOPolicy">
               <attribute name="maxNodes">500</attribute>
            </region>
         </config>
      </attribute>

And then created a region programmatically and assigned FIFOPolicy to that region.

FIFOConfiguration evictionConfig = new FIFOConfiguration();
evictionConfig.setMaxNodes(CacheConstants.60);

Region rn = getCache().getRegion(Fqn.fromString("\a\b\c"), true);
rn.setEvictionPolicy(evictionConfig);

Add some nodes under "/a/b/c". All nodes are added to the evictionqueue properly. 

But when I traverse  the region /a/b/c,  This node is also added to the evictionqueue and when the queue reaches the limit "MAXNodes"( which is 60 here), the node /a/b/c is evicted from cache.

I think a visted node should not be evicted in a FIFO policy. 

After going through the code, I noticed that VISIT_NODE_EVENT is not ignored in the FIFOPolicy class.

Overriding the bemow method in org.jboss.cache.eviction.FIFOPolicy will fix the issue:

public boolean canIgnoreEvent(Fqn fqn, NodeEventType eventType) {
         return (eventType == NodeEventType.VISIT_NODE_EVENT);
}


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