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https://issues.apache.org/jira/browse/BEAM-1327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15998603#comment-15998603
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Robert Bradshaw commented on BEAM-1327:
---------------------------------------

I had re-opened this to make sure the APIs between SDKs are aligned. Instead, 
I've created https://issues.apache.org/jira/browse/BEAM-2184 which may just 
involve changing the name in Python. 

> Replace OutputTimeFn with enum
> ------------------------------
>
>                 Key: BEAM-1327
>                 URL: https://issues.apache.org/jira/browse/BEAM-1327
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Assignee: Kenneth Knowles
>            Priority: Minor
>              Labels: backward-incompatible
>             Fix For: First stable release
>
>
> The class {{OutputTimeFn}} is overkill for a Fn API crossing. There are only 
> three sensible values known: MIN, MAX, EOW. The interface is right for 
> implementing these, but the full class is left over from the days when there 
> was little cost to shipping new kinds of fns. An enum is concise.
> This can be done "mostly" backwards compatibly with legacy adapters in place, 
> but might be less confusing without them.



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