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https://issues.apache.org/jira/browse/FLINK-13812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrey Zagrebin closed FLINK-13812.
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Resolution: Done
> Code style for the usage of Java Optional
> -----------------------------------------
>
> Key: FLINK-13812
> URL: https://issues.apache.org/jira/browse/FLINK-13812
> Project: Flink
> Issue Type: Sub-task
> Components: Documentation, Project Website
> Reporter: Andrey Zagrebin
> Assignee: Andrey Zagrebin
> Priority: Major
> Labels: codestyle, pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> * Use @Nullable annotation where you do not use Optional for the nullable
> values
> * If you can prove that Optional usage would lead to a performance
> degradation in critical code then fallback to @Nullable
> * Always use Optional to return nullable values in the API/public methods
> except the case of a proven performance concern
> * Do not use Optional as a function argument, instead either overload the
> method or use the Builder pattern for the set of function arguments
> ** Note: an Optional argument can be allowed in a *private* helper method if
> you believe that it simplifies the code ([example|#L95]])
> * Do not use Optional for class fields
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