Github user aljoscha commented on a diff in the pull request:
https://github.com/apache/flink/pull/1979#discussion_r63047675
--- Diff:
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/triggers/Trigger.java
---
@@ -169,7 +170,17 @@ public void clear(W window, TriggerContext ctx) throws
Exception {}
* function (function is
not part os a KeyedStream).
*/
<S extends State> S getPartitionedState(StateDescriptor<S, ?>
stateDescriptor);
-
+
+ /**
+ *
+ * Get an existing accumulator by <code>name</code> if it
exists, Otherwise add <code>defaultAccumulator</code>.
+ *
+ * @param name Name of the accumulator
+ * @param defaultAccumulator Accumulator to add, if no
accumulator of the given name exists
+ * @return The accumulator registered by the given
<code>name</code> or the given default <code>defaultAccumulator</code>
+ */
+ public <V, A extends Serializable> Accumulator<V, A>
getAccumulator(String name,
org.apache.flink.api.common.accumulators.Accumulator<V, A> defaultAccumulator);
--- End diff --
`org.apache.flink.api.common.accumulators.Accumulator` can be shortened to
`Accumulator`
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