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https://issues.apache.org/jira/browse/APEXCORE-580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877449#comment-15877449
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ASF GitHub Bot commented on APEXCORE-580:
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GitHub user bhupeshchawda reopened a pull request:
https://github.com/apache/apex-core/pull/440
APEXCORE-580-581 custom control tuple support
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/bhupeshchawda/apex-core
APEXCORE-580-581-custom-control-tuples
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/apex-core/pull/440.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #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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