[infinispan-issues] [JBoss JIRA] (ISPN-5035) DeltaAware support for conditional operations
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https://issues.jboss.org/browse/ISPN-5035?page=com.atlassian.jira.plugin....
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Dan Berindei commented on ISPN-5035:
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I don't think put operations should be allowed to return arbitrary values, depending
on the type of the value inserted into the cache. Couldn't you use
{{DistributedExecutorService.submit(task, key)}} instead?
DeltaAware support for conditional operations
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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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