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From tushargosavi <...@git.apache.org>
Subject [GitHub] incubator-apex-core pull request: APEX-103: Add module and dag int...
Date Fri, 04 Dec 2015 06:18:50 GMT
Github user tushargosavi commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-core/pull/148#discussion_r46652441
  
    --- Diff: api/src/main/java/com/datatorrent/api/Module.java ---
    @@ -21,8 +21,136 @@
     import org.apache.hadoop.classification.InterfaceStability;
     import org.apache.hadoop.conf.Configuration;
     
    +import com.datatorrent.api.Context.PortContext;
    +import com.datatorrent.api.Operator.InputPort;
    +import com.datatorrent.api.Operator.OutputPort;
    +import com.datatorrent.api.Operator.Unifier;
    +
    +/**
    + * A Module is a component which can be added to the DAG similar to the operator,
    + * using addModule API. The module should implement populateDAG method, which
    + * will be called by the platform, and DAG populated by the module will be
    + * replaced in place of the module.
    + *
    + */
     @InterfaceStability.Evolving
     public interface Module
     {
       void populateDAG(DAG dag, Configuration conf);
    +
    +  /**
    +   * These ports allow platform to short circuit module port to the operator port.
    +   * i.e When a module is expanded, it can specify  which operator's port is used
    +   * to replaced the module port in the final DAG.
    +   * @param <T> data type accepted at the input port.
    +   */
    +  public final class ProxyInputPort<T> implements InputPort<T>
    --- End diff --
    
    removed public


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