David Yan created APEXCORE-580:
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             Summary: Add methods 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. 





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