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Posted to commits@beam.apache.org by "Reuven Lax (JIRA)" <ji...@apache.org> on 2017/05/16 17:24:04 UTC

[jira] [Created] (BEAM-2304) State API cannot recognize State superclases

Reuven Lax created BEAM-2304:
--------------------------------

             Summary: State API cannot recognize State superclases
                 Key: BEAM-2304
                 URL: https://issues.apache.org/jira/browse/BEAM-2304
             Project: Beam
          Issue Type: Bug
          Components: sdk-java-core
            Reporter: Reuven Lax
            Assignee: Kenneth Knowles


The following code:

@StateId("foo")
            private final StateSpec<CombiningState<Integer, int[], Integer>> state =
                StateSpecs.combining(Sum.ofIntegers());
            @ProcessElement
            public void processElement(ProcessContext c,
                                       @StateId("foo") GroupingState<Integer, Integer> state) {
}

Fails with: 

parameter of type GroupingState<Integer, Integer> at index 1: reference to StateId exists with different type CombiningState<Integer, int[], Integer>

However since GroupingState<Integer, Integer> is the base class, ideally this should work - and would make the API easier to use if it did.







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