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https://issues.apache.org/jira/browse/BEAM-1327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937807#comment-15937807
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Kenneth Knowles commented on BEAM-1327:
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Noting that the first step is already in progress - converting to/from an enum
as part of the Runner API. This should make it easy to go all the way and have
the user provide an enum while runners/core-java provides implementations
copied from today's logic. Basically the same transition as triggers.
> 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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