[GitHub] [flink] winitzki opened a new pull request #9397: [FLINK-13658] [API / DataStream] Combine two triggers into one

[GitBox]

winitzki opened a new pull request #9397: [FLINK-13658] [API / DataStream] 
Combine two triggers into one
URL: https://github.com/apache/flink/pull/9397
 
 
   This is a new feature: combine two triggers into one. A new case class 
`TriggerOf[T, W]` provides this functionality.
   
   Sample (working) code:
   
   ```scala
   val combinedTrigger = 
TriggerOf(PurgingTrigger.of(CountTrigger.of[TimeWindow](windowSize)), 
PurgingTrigger.of(ProcessingTimeTrigger.create()))
   
   env.addSource(...)
     . keyBy(element => ...)
     .timeWindow(Time.milliseconds(windowTimeoutMs))
     .trigger(combinedTrigger)
    .process(...)
    .addSink(...)
   ```

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