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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