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https://issues.apache.org/jira/browse/NIFI-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Thomsen resolved NIFI-1305.
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Resolution: Fixed
Fix Version/s: 1.8.0
> Clarify Javadoc on DistributedMapCacheClient.getAndPutIfAbsent
> --------------------------------------------------------------
>
> Key: NIFI-1305
> URL: https://issues.apache.org/jira/browse/NIFI-1305
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Documentation & Website
> Affects Versions: 0.4.0
> Reporter: Michael Kobit
> Priority: Trivial
> Fix For: 1.8.0
>
>
> The Javadoc for this method on DistributedMapCacheClient
> (https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-services/nifi-distributed-cache-client-service-api/src/main/java/org/apache/nifi/distributed/cache/client/DistributedMapCacheClient.java#L53-L71)
> is unclear about what happens if the key does not exist in the cache.
> It looks like from the implementation of DistributedMapCacheClientService
> that it returns the value if it present, otherwise returns the computed
> value. The Javadoc doesn't state what is returned happens if an item does not
> exist.
> I spent some time trying to figure out what makes sense from a client's
> perspective, and I had some trouble trying to understand what should happen.
> It seems obvious to me now that the cache should return either the existing
> value or the newly computed value, but it took some time to get there.
> I think the documentation should be clearer about what is returned in the
> case where the item does not exist
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