becketqin opened a new pull request #10487: [FLINK-15100][connector/source] Add a base implementation for SourceReader. URL: https://github.com/apache/flink/pull/10487 ## What is the purpose of the change This patch assumes the existence of #10486 . This patch adds a [base implementation of Source API](https://cwiki.apache.org/confluence/display/FLINK/FLIP-27%3A+Refactor+Source+Interface#FLIP-27:RefactorSourceInterface-PublicinterfacefrombaseSourceimplementation) mentioned in FLIP-27. The base implementation provides a flexible threading model for the `SourceReaders`. It further divide the work of a `SourceReader` into `SplitReader` and `RecordEmitter`. So the source developers can focus on reading the raw records and converting them for downstream processing. ## Brief change log Add the base implementation of `SourceReader`. The base implementation introduces a few user facing interfaces: The user facing interface include: - SplitReader - The stateless and thread-less high level reader which is only responsible for reading raw records of type <E> from the assigned splits. - SplitChange - The split change to the split reader. Right now there is only one subclass which is SplitAddition. - RecordsWithSplitIds - A container class holding the raw records of type <E> read by SplitReader. - RecordEmitter - A class that takes the raw records of type <E> returned by the SplitReader, convert them into the final record type <T> and emit them into the SourceOutput. ## Verifying this change This change added tests and can be verified in the `org.apache.flink.api.connector.source.reader.SourceReaderBaseTest`. ## 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)`: (yes) - The serializers: (yes ) - The runtime per-record code paths (performance sensitive): (yes) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (yes) - If yes, how is the feature documented? (JavaDocs, [FLIP-27](https://cwiki.apache.org/confluence/display/FLINK/FLIP-27%3A+Refactor+Source+Interface))
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