[jira] [Created] (FLINK-3312) Add convenience accessor methods for extended state interface

[Shang Yuanchun (Jira)]

Stephan Ewen created FLINK-3312:
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             Summary: Add convenience accessor methods for extended state interface
                 Key: FLINK-3312
                 URL: https://issues.apache.org/jira/browse/FLINK-3312
             Project: Flink
          Issue Type: Sub-task
          Components: Core
    Affects Versions: 1.0.0
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 1.0.0


The {{RuntimeContext}} should offer dedicated methods to create the {{ValueState}}, {{ListState}}, and {{ReducingState}}.

The {{StateDescriptor}} classes also need convenience constructors that accept simple classes to indicate the types, rather than requiring to pass serializers directly.



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