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Posted to dev@flink.apache.org by "Stephan Ewen (JIRA)" <ji...@apache.org> on 2018/05/17 15:12:00 UTC
[jira] [Created] (FLINK-9392) Add @FunctionalInterface annotations
to all core functional interfaces
Stephan Ewen created FLINK-9392:
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Summary: Add @FunctionalInterface annotations to all core functional interfaces
Key: FLINK-9392
URL: https://issues.apache.org/jira/browse/FLINK-9392
Project: Flink
Issue Type: Improvement
Components: Core
Reporter: Stephan Ewen
Assignee: Stephan Ewen
The {{@FunctionalInterface}} annotation should be added to all SAM interfaces in order to prevent accidentally breaking them (as non SAMs).
We had a case of that before for the {{SinkFunction}} which was compatible through default methods, but incompatible for users that previously instantiated that interface through a lambda.
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