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Thomas Weise commented on APEXMALHAR-2194:
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OK, then this is something different. The interfaces in core currently are for
the operator class only, not for arbitrary components within operators.
> 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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