[infinispan-issues] [JBoss JIRA] (ISPN-5035) DeltaAware support for conditional operations

[Radim Vansa (JIRA)]

Radim Vansa created ISPN-5035:
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             Summary: DeltaAware support for conditional operations
                 Key: ISPN-5035
                 URL: https://issues.jboss.org/browse/ISPN-5035
             Project: Infinispan
          Issue Type: Feature Request
          Components: Core
            Reporter: Radim Vansa


Current delta-aware approach is implemented only in PutKeyValueCommand and ApplyDeltaCommand. This implementation does not allow to execute conditional delta-aware commands - or rather it does not allow to return any kind of value (the condition itself can be implemented inside the delta).

One use-case when this would be required is equivalent of AtomicLong.getAndIncrement(). Currently we can implement this using

{code}
Long previous;
do {
    previous = cache.get(key);
} while (cache.replace(key, previous, previous + 1);
{code}

which requires at least two RPCs. With more generic interface, such as JCache's EntryProcessor this could be implemented using single RPC.

(so, this JIRA is basically a request to native support for EntryProcessor)



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