[jboss-jira] [JBoss JIRA] Created: (EJBTHREE-844) We need a optimistic locking version of TreeCacheProviderHook

[Galder Zamarreno (JIRA)]

We need a optimistic locking version of TreeCacheProviderHook
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                 Key: EJBTHREE-844
                 URL: http://jira.jboss.com/jira/browse/EJBTHREE-844
             Project: EJB 3.0
          Issue Type: Bug
          Components: Clustering
    Affects Versions: EJB 3.0 RC9 - Patch 1, EJB 3.0 RC9 - FD
            Reporter: Galder Zamarreno
         Assigned To: Galder Zamarreno
         Attachments: OptimisticTreeCacheProviderHook.java

Currently, EJB3/Hibernate cannot take advantage of using a second level
cache based in optimistic locking in a EJB3 environment. We only have a 
TreeCacheProviderHook CacheProvider for pessimistic locking which 
means that if a customer wants to set up optimistic locking, it's forced to 
use OptimisticTreeCacheProvider.

However, this class was not designed for managed environments and 
ends up creating another cache, so you end up with two caches for the 
same job in the same instance which is wrong.

I have created a OptimisticTreeCacheProviderHook which creates an 
org.hibernate.cache.OptimisticTreeCache based on the TreeCacheMBean 
instance looked up. Please find attached.

This could be improved by creating a accessor method for 
TreeCacheProviderHook.cache, so that I can directly extend it rather 
than reimplementing CacheProvider. But, I have gone followed the 
CacheProvider implementation path so that I can quickly pass a 
patched jar containing this class only to the customer for them to try.

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