[jira] [Created] (FLINK-13765) Introduce the InputSelectionHandler for selecting next input in StreamTwoInputSelectableProcessor

[Shang Yuanchun (Jira)]

zhijiang created FLINK-13765:
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             Summary: Introduce the InputSelectionHandler for selecting next input in StreamTwoInputSelectableProcessor
                 Key: FLINK-13765
                 URL: https://issues.apache.org/jira/browse/FLINK-13765
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Task
            Reporter: zhijiang
            Assignee: zhijiang


In StreamTwoInputSelectableProcessor there are three fields \{InputSelectable, InputSelection, availableInputsMask} to be used together for the function of selecting next available input index. It would bring two problems:
 * From design aspect, these fields should be abstracted into a separate component and passed into StreamTwoInputSelectableProcessor.
 * inputSelector.nextSelection() is called while processing elements in  StreamTwoInputSelectableProcessor, so it is the blocker for integrating task input/output for both StreamOneInputProcessor/StreamTwoInputSelectableProcessor later.



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