[infinispan-issues] [JBoss JIRA] (ISPN-5643) Simplify handling of previous values

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-5643:
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             Summary: Simplify handling of previous values
                 Key: ISPN-5643
                 URL: https://issues.jboss.org/browse/ISPN-5643
             Project: Infinispan
          Issue Type: Task
          Components: Core
    Affects Versions: 8.0.0.Beta2
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 8.0.0.Beta3


There are 5 ways the user can influence whether the previous value is read from a store/remote node:
* unsafe.unreliableReturnValues
* IGNORE_RETURN_VALUES
* SKIP_CACHE_LOAD
* SKIP_REMOTE_LOOKUP
* CACHE_MODE_LOCAL

Currently the effect of each is slightly different, depending on whether the operation is conditional, whether it's a delta-aware write etc. This is how I think it should work:
* unsafe.unreliableReturnValues and IGNORE_RETURN_VALUES should skip reading the previous value only if it doesn't change the outcome of the operation (i.e. no effect for reads, conditional operations, or delta-aware).
* SKIP_CACHE_LOAD should *always* skip the cache loader.
* SKIP_REMOTE_LOOKUP and CACHE_MODE_LOCAL should *always* skip the remote lookup




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