zhijiang created FLINK-14004:
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             Summary: Define SourceReader interface to verify the integration 
with StreamOneInputProcessor
                 Key: FLINK-14004
                 URL: https://issues.apache.org/jira/browse/FLINK-14004
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Task
            Reporter: zhijiang
            Assignee: zhijiang


We already refactored the task input and output sides based on the new source 
characters in FLIP-27. In order to further verify that the new source reader 
could work well with the unified StreamOneInputProcessor in mailbox model, we 
would design a unit test for integrating the whole process. In detail:
 * Define SourceReader and SourceOutput relevant interfaces based on FLIP-27

 * Implement an example of stateless SourceReader (bounded sequence of integers)

 * Define SourceReaderOperator to integrate the SourceReader with 
StreamOneInputProcessor

 * Define SourceReaderStreamTask to execute the source input and implement a 
unit test for it.



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