Github user ilooner commented on a diff in the pull request:
https://github.com/apache/incubator-apex-malhar/pull/129#discussion_r47580479
--- Diff:
library/src/main/java/com/datatorrent/lib/dimensions/aggregator/Aggregator.java
---
@@ -0,0 +1,14 @@
+package com.datatorrent.lib.dimensions.aggregator;
+
+import com.datatorrent.lib.dimensions.AggregateEvent;
+
+import gnu.trove.strategy.HashingStrategy;
+
+public interface Aggregator<EVENT, AGGREGATE extends AggregateEvent>
extends HashingStrategy<EVENT>
--- End diff --
+1 This is a rare case where I agree with nesting the interface. An
Aggregator will never be used without an AggregateEvent.
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