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Posted to commits@beam.apache.org by "Robert Bradshaw (JIRA)" <ji...@apache.org> on 2016/03/09 09:53:40 UTC
[jira] [Created] (BEAM-101) Support data-driven triggers
Robert Bradshaw created BEAM-101:
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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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