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https://issues.apache.org/jira/browse/GEODE-726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Smith reassigned GEODE-726:
-------------------------------
Assignee: (was: Dan Smith)
> Add a getLocalDataSet to RegionFunctionContext and deprecate
> PartitionRegionHelper.getLocalData(RegionFunctionContext)
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: GEODE-726
> URL: https://issues.apache.org/jira/browse/GEODE-726
> Project: Geode
> Issue Type: Improvement
> Reporter: Dan Smith
> Priority: Major
>
> From
> https://cwiki.apache.org/confluence/display/GEODE/Function+Service+Usability+Improvments#FunctionServiceUsabilityImprovments-RegionFunctionContextshouldprovidethelocaldataset
> :
> If you want to operate on the local data set for a function, you have to do
> this
> {code}
> public void execute(FunctionContext context) {
> RegionFunctionContext ctx = (RegionFunctionContext) context;
> //This actually doesn't give you the local data set
> Region wholePartitionedRegion = ctx.getDataSet();
>
> //This does, using a static function call
> Region localData = PartitionRegionHelper.getLocalDataForContext(ctx);
>
> //This is a bad idea, because it may include some buckets that are also
> being processed on other nodes
> Region localDataDontDoThis =
> PartitionRegionHelper.getLocalData(ctx.getDataSet());
> {code}
>
> There are several problems with this approach.
> * It's not clear that ctx.getDataSet does not return the local data.
> * The local data set is not mockable for unit tests, because this static
> function call extracts it using internal APIs on concrete classes. This
> prevents this sort of function from being tested in a pure unit test.
> * The user has to know that PartitionRegionHelper exists; the API is not
> obvious
> * The various methods on PartitionRegionHelper are confusing, specifically
> it's unclear to a user why they should use getLocalDataForContext instead of
> getLocalData
>
> RegionFunctionContext should just provide a getLocalDataSet method. We should
> add this new method to the RegionFunctionContext interface. We should
> deprecate the PartitionRegionHelper.getLocalDataForContext.
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