[jira] [Commented] (BEAM-1327) Replace OutputTimeFn with enum

["Kenneth Knowles (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-1327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937807#comment-15937807 ] 

Kenneth Knowles commented on BEAM-1327:
---------------------------------------

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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