ASF GitHub Bot commented on APEXCORE-604:

Github user asfgit closed the pull request at:


> 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();
>     public abstract <T extends OperatorMeta> Collection<T> getOperators();
>     public abstract <T extends StreamMeta> Collection<T> getStreams();

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