[jira] [Commented] (FLINK-3674) Add an interface for EventTime aware User Function

[ASF GitHub Bot (JIRA)]

    [ 
https://issues.apache.org/jira/browse/FLINK-3674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395396#comment-15395396
 ] 

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_r72416703
  
    --- Diff: 
flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/AbstractUdfStreamOperator.java
 ---
    @@ -55,13 +56,18 @@
        
        /** the user function */
        protected final F userFunction;
    +
    +   protected EventTimeFunction eventTimeFunction;
        
        /** Flag to prevent duplicate function.close() calls in close() and 
dispose() */
        private transient boolean functionsClosed = false;
        
        
        public AbstractUdfStreamOperator(F userFunction) {
                this.userFunction = requireNonNull(userFunction);
    +           if(userFunction instanceof  EventTimeFunction) {
    --- End diff --
    
    missing space after if


> 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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