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https://issues.apache.org/jira/browse/APEXCORE-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893822#comment-15893822
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ASF GitHub Bot commented on APEXCORE-580:
-----------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/apex-core/pull/440
> Interface for processing and emitting control tuples
> ----------------------------------------------------
>
> Key: APEXCORE-580
> URL: https://issues.apache.org/jira/browse/APEXCORE-580
> Project: Apache Apex Core
> Issue Type: Sub-task
> Reporter: David Yan
>
> DefaultOutputPort needs to have a emitControl method so that operator code
> can call to emit a control tuple.
> DefaultInputPort needs to have a processControl method so that operator would
> be able to act on the arrival of a control tuple.
> Similar to a regular data tuple, we also need to provide a way for the user
> to provide custom serialization for the control tuple.
> We need to design this so that the default behavior is to propagate control
> tuples to all output ports, and it should allow the user to easily change
> that behavior. The user can selectively propagate control tuples to certain
> output ports, or block the propagation altogether.
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