Zakelly opened a new pull request, #25853:
URL: https://github.com/apache/flink/pull/25853
## What is the purpose of the change
The FLIP-455 introduces a set of internal APIs for declaring process. This
PR implements the first part - declaring process blocks and variables.
## Brief change log
Please check each commit.
- Internal APIs for declaring elements and timers processing
- Internal APIs for declaring variables that share across callbacks with
same context
- Chain-style declaring
- An basic operator and function for those APIs.
## Verifying this change
This change added tests `AsyncKeyedProcessOperatorTest`.
## 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): yes
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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