[jboss-jira] [JBoss JIRA] Closed: (JBCACHE-1215) NullEvictionPolicy

NullEvictionPolicy ------------------ Key: JBCACHE-1215 URL: http://jira.jboss.com/jira/browse/JBCACHE-1215 Project: JBoss Cache Issue Type: Feature Request Security Level: Public(Everyone can see) Reporter: Brian Stansberry Assigned To: Brian Stansberry Priority: Minor Fix For: 2.1.0.CR3 An eviction policy that allows returns 'true' to EvictionPolicy.canIgnoreEvent(). Other methods are no-ops or equivalent defaults. Use case is situations where there are multiple eviction regions in a cache, some of which should never evict anything. You could use an LRUPolicy with maxAge=0, maxNodes=0 to accomplish a similar thing, but then you incur wasted overhead of generating, queuing up and processing node events. NullEvictionPolicy just bypasses everything. Some usages: Hibernate timestamp caching. The timestamp region should never be evicted. HttpSession caching with FIELD. I'll probably need to use JBC eviction for the JBossInternal_ area to passivate pojos. But passivating the sessions themselves should not be managed by JBC. So I could use NullEvictionPolicy for the session storage area. Could also be inserted as a global default if JBC detects that the _default_ region wasn't configured while a subregion was. I coded this up one night a while ago and forgot about it. Could be added to 2.1.0.GA if not too late; otherwise later.