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https://issues.apache.org/jira/browse/APEXMALHAR-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422049#comment-15422049
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Thomas Weise commented on APEXMALHAR-2194:
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Not clear what the purpose is and why should it be in core? 
CheckpointNotificationListener is an interface which an operator can implement, 
begin/endWindow are already there.

> 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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