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From "Jody Grassel (JIRA)" <>
Subject [jira] Created: (OPENJPA-1328) Move cacheable class configuration to ClassMetaData
Date Fri, 25 Sep 2009 18:39:15 GMT
Move cacheable class configuration to ClassMetaData

                 Key: OPENJPA-1328
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache
    Affects Versions: 1.2.1, 1.2.0
            Reporter: Jody Grassel
            Assignee: Michael Dick

I'm proposing to move the cacheable class configuration processing from the datacache classes
to ClassMetaData.  The feature, introduced in OPENJPA-1045, effectively works by returning
null for ClassMetaData.getDataCacheName(), where classes which should not be cached return
null, otherwise the name of the datacache they may be cached by is returned.  

THe problem is that some third party datacache plugins are not reentrant, and the existing
ClassMetaData.isCacheable() makes use of the method call getRepository().getConfiguration().getDataCacheManagerInstance().
 This invokes the initialization of the datacache, which may result in further initialization/copying
of CMD objects, which reenter the isCacheable() method.  If a third party datacache plugin
is not reentrant safe, this can cause a failure in the form of Exceptions or hung threads.

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