Package org.apache.flink.datastream.api.extension.eventtime

Class EventTimeExtension

java.lang.Object
org.apache.flink.datastream.api.extension.eventtime.EventTimeExtension
@Experimental public class EventTimeExtension extends Object
The entry point for the event-time extension, which provides the following functionality:
  • defines the event-time watermark and idle status watermark. If you use the EventTimeWatermarkGeneratorBuilder below, then you don't need to declare these watermarks manually in your application; otherwise you need to declare them in your own ProcessFunction.
  • provides the EventTimeWatermarkGeneratorBuilder to facilitate the generation of event time watermarks. An example of using EventTimeWatermarkGeneratorBuilder is as follows: 
    
 OneInputStreamProcessFunction<POJO, POJO> watermarkGeneratorProcessFunction
       = EventTimeExtension
       .newWatermarkGeneratorBuilder(POJO::getEventTime)
       .periodicWatermark()
       .buildAsProcessFunction();
 source.process(watermarkGeneratorProcessFunction)
       .process(...)
  • provides a tool to encapsulate a user-defined EventTimeProcessFunction to provide the relevant components of the event-time extension. 
    
 stream.process(
          EventTimeExtension.wrapProcessFunction(
              new CustomEventTimeProcessFunction()
          )
       )
       .process(...)