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From "Robert Bradshaw (JIRA)" <j...@apache.org>
Subject [jira] [Created] (BEAM-101) Support data-driven triggers
Date Wed, 09 Mar 2016 08:53:40 GMT
Robert Bradshaw created BEAM-101:
------------------------------------

             Summary: Support data-driven triggers
                 Key: BEAM-101
                 URL: https://issues.apache.org/jira/browse/BEAM-101
             Project: Beam
          Issue Type: New Feature
          Components: beam-model
            Reporter: Robert Bradshaw
            Assignee: Frances Perry


For some applications, it's useful to declare a pane/window to be emitted (or finished) based
on its contents. The simplest of these is the AfterCount trigger, but more sophisticated predicates
could be constructed. 

As the element types may change between the application of Windowing and the actuation of
the trigger, one idea is to extract the relevant data from the element at Windowing and pass
it along implicitly where it can be inspected in a typesafe way later (similar to how timestamps
and windows are implicitly passed with elements). 



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