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

[Manik Surtani (JIRA)]

     [ http://jira.jboss.com/jira/browse/JBCACHE-1149?page=all ]

Manik Surtani updated JBCACHE-1149:
-----------------------------------

    Fix Version/s: 2.0.0.GA

> FIFOPolicy is adding a visited node to the evictionqueue
> --------------------------------------------------------
>
>                 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, MonthOfBugs_200
>    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
>             Fix For: 2.0.0.GA
>
>
> 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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