[infinispan-issues] [JBoss JIRA] Created: (ISPN-450) Add AtomicMapLookup method to use in Read Only operation without creating new map if none exists.

[Alexander Gavrilov (JIRA)]

Add AtomicMapLookup method to use in Read Only operation without creating new map if none exists.  
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                 Key: ISPN-450
                 URL: https://jira.jboss.org/browse/ISPN-450
             Project: Infinispan
          Issue Type: Feature Request
          Components: Core API
    Affects Versions: 4.1.0.BETA1
            Reporter: Alexander Gavrilov
            Assignee: Manik Surtani
             Fix For: 4.1.0.CR1


AtomicMapLookup declared as the *only* way AtomicMaps are created/retrieved. But getAtomicMap method has side effect and if no map exists in cache this method creates new one. Sometimes we need to use getAtomicMap in read only fashion without this side effect. One solution is to add Method getAtomicMapForRead that if no entry exists in cache returns something like Collections.emptyMap()  and if entry exists returns wrapper like Collections.unmodifiableMap() 

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