[infinispan-issues] [JBoss JIRA] Created: (ISPN-1242) Add dynamic grouping capabilities for immutable key classes.

[Erik Salter (JIRA)]

Add dynamic grouping capabilities for immutable key classes.
------------------------------------------------------------

                 Key: ISPN-1242
                 URL: https://issues.jboss.org/browse/ISPN-1242
             Project: Infinispan
          Issue Type: Feature Request
            Reporter: Erik Salter
            Assignee: Manik Surtani


The grouping API should be enhanced to add grouping capabilities to a a cache's put() or replace() methods.

This encompasses the following scenario:

Cache A uses a custom key class where the group is dynamically generated. Cache B's key is an unmodifiable String that needs to be grouped with the dynamic value of a key from Cache A. (Cache B's key can't be encapsulated in a custom key class since it needs to be queried from external entities that will not know the group context).

And in pseudo-code:

{code}
Group class InternalResourceKey { 

   String group;
   ... 
   @Group
   String getGroup() {
      return group;
   }
 }
InternalResourceKey key = new InternalResourceKey(); 
{code}
...

{code}
resourceCache.lock( key );

// Get the previous result.
ResourceResult result = resourceCache.get( key );

ResourceResult newResult = doWork( key, result );
resourceCache.put( key, newResult );

// I also want to group an external identifier that an external client knows about with the result so they will be on the same node
employeeCache.put( "111-111-1111", newResult, key.getGroup() );
{code}

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