Package org.apache.flink.table.runtime.operators.bundle.trigger

Interface BundleTrigger<T>

Type Parameters:

T - The input element type.

All Superinterfaces:

Serializable

All Known Implementing Classes:

CountBundleTrigger

@Internal
public interface BundleTrigger<T>
extends Serializable

A BundleTrigger determines when a bundle of input elements should be evaluated and trigger the callback which registered previously.

Method Summary

Modifier and Type	Method	Description
String	explain()
void	onElement(T element)	Called for every element that gets added to the bundle.
void	registerCallback(BundleTriggerCallback callback)	Register a callback which will be called once this trigger decides to finish this bundle.
void	reset()	Reset the trigger to its initiate status.

Method Details

registerCallback

void registerCallback(BundleTriggerCallback callback)

Register a callback which will be called once this trigger decides to finish this bundle.

onElement

void onElement(T element)
        throws Exception

Called for every element that gets added to the bundle. If the trigger decides to start evaluate the input, BundleTriggerCallback.finishBundle() should be invoked.

Parameters:

element - The element that arrived.

Throws:

Exception

reset

void reset()

Reset the trigger to its initiate status.

explain

String explain()