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From "David Yan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-2194) Move WindowListener to somewhere in apex-core
Date Tue, 16 Aug 2016 02:32:20 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422069#comment-15422069
] 

David Yan commented on APEXMALHAR-2194:
---------------------------------------

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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