David Yan created APEXMALHAR-2194:
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Summary: 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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