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From "Tushar Gosavi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (APEXCORE-577) Visitor API for DAG
Date Fri, 25 Nov 2016 11:23:58 GMT
Tushar Gosavi created APEXCORE-577:

             Summary: Visitor API for DAG
                 Key: APEXCORE-577
                 URL: https://issues.apache.org/jira/browse/APEXCORE-577
             Project: Apache Apex Core
          Issue Type: Improvement
            Reporter: Tushar Gosavi

Support an Visitor like api for DAG, which could be used to write plugins for Apex.

change DAG interface to add a visitor
registerVisitor(DagVisitor visitor)

The DagVisitor interface
interface DagVisitor {
  boolean startDAG(DAG* dag);
  boolean visitOperator(OperatorMeta *ometa)
  boolean visitStream(StreamMeta *smeta);
  boolean endDAG()

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