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David Yan commented on APEXMALHAR-2194:
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This is for any component of an operator that needs to know when beginWindow
and endWindow are called. One example is managed state. There may be others in
the future that need similar callbacks. This is generic enough to be at least
moved out of the spillable package, and possibly to apex-core.
> Move WindowListener to somewhere in apex-core
> ---------------------------------------------
>
> Key: APEXMALHAR-2194
> URL: https://issues.apache.org/jira/browse/APEXMALHAR-2194
> Project: Apache Apex Malhar
> Issue Type: Task
> Reporter: David Yan
> Assignee: David Yan
>
> As part of the spillable data structure work, we added the WindowListener
> interface in org.apache.apex.malhar.lib.state.spillable package. But it
> should really be part of core to represent any component that needs to be
> notified for beginWindow and endWindow, much like
> CheckpointNotificationListener.
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