[jira] [Commented] (FLINK-3674) Add an interface for Time aware User Functions

["Jaromir Vanek (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15885891#comment-15885891 ] 

Jaromir Vanek commented on FLINK-3674:
--------------------------------------

Hi,

I am wondering what was the intention behind not proxying `deleteTimer` methods in `TimerService` interface. It would be nice to have a full access to timers.

If it is just about efficiency of removing from `PriorityQueue` in `HeapInternalTimerService` it can be solved in my opinion. 

> Add an interface for Time aware User Functions
> ----------------------------------------------
>
>                 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: Aljoscha Krettek
>             Fix For: 1.2.0
>
>
> 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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