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https://issues.apache.org/jira/browse/APEXCORE-604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15849510#comment-15849510
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ASF GitHub Bot commented on APEXCORE-604:
-----------------------------------------
Github user tushargosavi closed the pull request at:
https://github.com/apache/apex-core/pull/447
> Extend DAG API to allow accessing DAG objects.
> ----------------------------------------------
>
> Key: APEXCORE-604
> URL: https://issues.apache.org/jira/browse/APEXCORE-604
> Project: Apache Apex Core
> Issue Type: Sub-task
> Reporter: Tushar Gosavi
> Assignee: Tushar Gosavi
>
> I am planing extend the DAG api to export internals of the DAG.
> Current DAG does not provide a way to get the list of operators and
> streams with their attributes. Also streamMeta does not provide
> API to access end ports.
> This type of information is needed when external translator (like
> Samoa) are constructing the DAG,
> and we need to apply some transformation or configure the DAG before
> it is run. Planing to extend
> DAG API with following.
> InputPortMeta
> public Operator.InputPort<?> getPortObject();
> OutputPortMeta
> public Operator.OutputPort<?> getPortObject();
> streamMeta
> public <T extends OutputPortMeta> T getSource();
> public <T extends InputPortMeta> Collection<T> getSinks();
> DAG
> public abstract <T extends OperatorMeta> Collection<T> getOperators();
> public abstract <T extends StreamMeta> Collection<T> getStreams();
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