[jboss-jira] [JBoss JIRA] Created: (JBCACHE-766) Don't return unnecessary values from _replicate, avoiding need for marshalling

[Owen Taylor (JIRA)]

Don't return unnecessary values from _replicate, avoiding need for marshalling
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                 Key: JBCACHE-766
                 URL: http://jira.jboss.com/jira/browse/JBCACHE-766
             Project: JBoss Cache
          Issue Type: Patch
      Security Level: Public (Everyone can see)
          Components: Clustering
    Affects Versions: 1.4.0.SP1
            Reporter: Owen Taylor
         Assigned To: Manik Surtani
            Priority: Minor
             Fix For: 1.4.0.SP2


This is somewhat related to JBCACHE-752, which suggests setting a marshaller for
responses passed over RpcDispatcher as well as for requests, but is a simpler and
less general fix.

Right now if you set a class loader for a tree cache region, it works for request parameters,
but is ignored for returns. If there is an attempt to return a value that needs to be loaded
with the class loader, an exception will be thrown.

The only return value in normal REPL_SYNC operation is the return value from 
the key-value put methods, which is the old value, if any. But that return value isn't
needed for replication. So, this patch just nulls out the return value from the two affected
methods.

(We're setting a class loader to deal with the fact that enumerations fields of Hibernate 
entities are stored directly in the cache, and are serialized/deserialized on replication.
There's a JIRA entry for that issue, which likely should be fixed in Hibernate by storing
such fields as ordinals, but I think this patch is a legitimate TreeCache fix, if done in a slightly 
hacky manner.)



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