Github user gauravgopi123 commented on a diff in the pull request:
https://github.com/apache/incubator-apex-core/pull/185#discussion_r47780330
--- Diff: api/src/main/java/com/datatorrent/api/Context.java ---
@@ -161,6 +161,13 @@
*/
Attribute<Class<?>> TUPLE_CLASS = new Attribute<>(new
Class2String<>());
+ /**
+ * Attribute of input port.
+ * This is a read-only attribute to query whether the input port is
connected to a DelayOperator
+ * This is for iterative processing.
+ */
+ Attribute<Boolean> IS_CONNECTED_TO_DELAY_OPERATOR = new
Attribute<>(false);
--- End diff --
@davidyan74 : There are some internal Attributes defined in LogicalPlan. I
think we should do the same for this as well. Define it as an internal
attribute and use that. Only thing is that you now will have to first check if
portContext.getValue() returns null or not
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