org.apache.flink.streaming.api.windowing.policy

Interface ActiveTriggerCallback

public interface ActiveTriggerCallback

In case an ActiveTriggerPolicy is used, it can implement own Runnable classes. Such Runnable classes will be executed as an own thread and can submit fake elements, to the element buffer at any time. The factory method for runnables of the ActiveTriggerPolicy gets an instance of this interface as parameter. The describes adding of elements can be done by the runnable using the methods provided in this interface.

Method Summary

Modifier and Type	Method and Description
void	sendFakeElement(Object datapoint) Submits a new fake data point to the element buffer.

Method Detail

sendFakeElement

void sendFakeElement(Object datapoint)

Submits a new fake data point to the element buffer. Such a fake element might be used to trigger at any time, but will never be included in the result of the reduce function. The submission of a fake element causes notifications only at the ActiveTriggerPolicy and ActiveEvictionPolicy implementations.

Parameters:

datapoint - the fake data point to be added