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Posted to issues@flink.apache.org by "Stephan Ewen (JIRA)" <ji...@apache.org> on 2018/05/18 08:13:00 UTC

[jira] [Closed] (FLINK-9392) Add @FunctionalInterface annotations to all core functional interfaces

     [ https://issues.apache.org/jira/browse/FLINK-9392?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephan Ewen closed FLINK-9392.
-------------------------------

> 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
>            Priority: Critical
>             Fix For: 1.6.0
>
>
> 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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