Github user gauravgopi123 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/148#discussion_r46917859
--- 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);
+
--- End diff --
Unless module and application developer are same, module developer won't
know anything about the global properties used for application
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