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https://issues.apache.org/jira/browse/APEXCORE-577?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tushar Gosavi closed APEXCORE-577.
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Closing after 3.6.0 release
> Plugin support to inspect DAG before launch.
> --------------------------------------------
>
> Key: APEXCORE-577
> URL: https://issues.apache.org/jira/browse/APEXCORE-577
> Project: Apache Apex Core
> Issue Type: Sub-task
> Reporter: Tushar Gosavi
> Assignee: Tushar Gosavi
> Fix For: 3.6.0
>
>
> Support an Visitor like api for DAG, which could be used to write plugins for
> Apex.
> change DAG interface to add a visitor
> {code}
> registerVisitor(DagVisitor visitor)
> {code}
> The DagVisitor interface
> {code}
> interface DagVisitor {
> boolean startDAG(DAG* dag);
> boolean visitOperator(OperatorMeta *ometa)
> boolean visitStream(StreamMeta *smeta);
> boolean endDAG()
> }
> {code}
> dev thread discussions
> https://lists.apache.org/thread.html/1c37e0954cee029c9de537cc35ecb35beebdf49aba17de89bd2ce9ed@%3Cdev.apex.apache.org%3E
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