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https://issues.apache.org/jira/browse/FLINK-3674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395404#comment-15395404
]
ASF GitHub Bot commented on FLINK-3674:
---------------------------------------
Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/2301#discussion_r72416957
--- Diff:
flink-streaming-java/src/test/java/org/apache/flink/streaming/runtime/operators/windowing/WindowOperatorTest.java
---
@@ -2003,6 +2048,53 @@ public void apply(String key,
}
+ public static class RichSumReducerWithEventTime<W extends Window>
extends RichWindowFunction<Tuple2<String, Integer>, Tuple2<String, Integer>,
String, W>
+ implements EventTimeFunction<String, W> {
+ private static final long serialVersionUID = 1L;
+
+ private boolean openCalled = false;
+ private static int count = 0;
+ @Override
+ public void open(Configuration parameters) throws Exception {
+ super.open(parameters);
+ openCalled = true;
+ }
+
+ @Override
+ public void close() throws Exception {
+ super.close();
+ closeCalled.incrementAndGet();
+ }
+
+ @Override
+ public void apply(String key,
+ W window,
+ Iterable<Tuple2<String,
Integer>> input,
--- End diff --
this _should_ fail checkstyle, as the indentation is partly done with
spaces. we only use tabs.
> Add an interface for EventTime aware User Function
> --------------------------------------------------
>
> Key: FLINK-3674
> URL: https://issues.apache.org/jira/browse/FLINK-3674
> Project: Flink
> Issue Type: New Feature
> Components: Streaming
> Affects Versions: 1.0.0
> Reporter: Stephan Ewen
> Assignee: ramkrishna.s.vasudevan
>
> I suggest to add an interface that UDFs can implement, which will let them be
> notified upon watermark updates.
> Example usage:
> {code}
> public interface EventTimeFunction {
> void onWatermark(Watermark watermark);
> }
> public class MyMapper implements MapFunction<String, String>,
> EventTimeFunction {
> private long currentEventTime = Long.MIN_VALUE;
> public String map(String value) {
> return value + " @ " + currentEventTime;
> }
> public void onWatermark(Watermark watermark) {
> currentEventTime = watermark.getTimestamp();
> }
> }
> {code}
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