sunhaibotb opened a new pull request #7959: [FLINK-11876] Introduce new TwoInputSelectable, BoundedOneInput and BoundedTwoInput interfaces URL: https://github.com/apache/flink/pull/7959 ## What is the purpose of the change Adds new TwoInputSelectable, BoundedOneInput and BoundedTwoInput interfaces for stream operators to support selective reading and EndOfInput event processing. ## Brief change log - Add new **InputIdentifier** class to represent the identifier for the input(s) of the operator. - Add new **TwoInputSelectable** class for two-input operators that can select the input to get the next StreamRecord. - Add new **BoundedOneInput** class for one-input operators that can process EndOfInput event. - Add new **BoundedTwoInput** class for two-input operators that can proceess EndOfInput event. ## Verifying this change This change is to add some new interfaces which will be covered by the tests of the implemention subtasks [FLINK-11877](https://issues.apache.org/jira/browse/FLINK-11877) and [FLINK-11878](https://issues.apache.org/jira/browse/FLINK-11878) . ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): **no** - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: **no** - The serializers: **no** - The runtime per-record code paths (performance sensitive): **no** - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: **no** - The S3 file system connector: **no** ## Documentation - Does this pull request introduce a new feature? **yes** - If yes, how is the feature documented? **JavaDocs**
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