zhijiangW opened a new pull request #9646: [FLINK-14004][task] Define SourceReader interface to verify the integration with StreamOneInputProcessor URL: https://github.com/apache/flink/pull/9646 ## What is the purpose of the change 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 implement 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. Note: This PR is based on #9478 and #9483 , so only review the last commit for this PR scope. ## Brief change log - Define `SourceReader` and `SourceOutput` relevant interfaces based on FLIP-27. - Define `AbstractDataOutput` as the base class for both source output and network output. - Refactor the previous processes based on `AbstractDataOutput`. - Define `SourceReaderOperator` to wrap the `SourceReader`. - Define `SourceReaderStreamTask` to generate the source input and output for `StreamOneInputProcessor`. ## Verifying this change - Added unit test in `SourceReaderStreamTaskTest` for verifying that the source reader could be integrated well with `StreamOneInputProcessor`. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (**yes** / no) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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