org.apache.flink.streaming.api.windowing.triggers

Class ContinuousProcessingTimeTrigger<W extends Window>

java.lang.Object

org.apache.flink.streaming.api.windowing.triggers.Trigger<Object,W>

org.apache.flink.streaming.api.windowing.triggers.ContinuousProcessingTimeTrigger<W>

Type Parameters:

W - The type of Windows on which this trigger can operate.

All Implemented Interfaces:

Serializable

@PublicEvolving
public class ContinuousProcessingTimeTrigger<W extends Window>
extends Trigger<Object,W>

A Trigger that continuously fires based on a given time interval. The time is the current system time.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.windowing.triggers.Trigger

Trigger.TriggerContext

Method Summary

Modifier and Type	Method and Description
void	clear(W window, Trigger.TriggerContext ctx) Clears any state that the trigger might still hold for the given window.
long	getInterval()
static <W extends Window> ContinuousProcessingTimeTrigger<W>	of(Time interval) Creates a trigger that continuously fires based on the given interval.
TriggerResult	onElement(Object element, long timestamp, W window, Trigger.TriggerContext ctx) Called for every element that gets added to a pane.
TriggerResult	onEventTime(long time, W window, Trigger.TriggerContext ctx) Called when an event-time timer that was set using the trigger context fires.
TriggerResult	onProcessingTime(long time, W window, Trigger.TriggerContext ctx) Called when a processing-time timer that was set using the trigger context fires.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

onElement

public TriggerResult onElement(Object element,
                               long timestamp,
                               W window,
                               Trigger.TriggerContext ctx)
                        throws Exception

Description copied from class: Trigger

Called for every element that gets added to a pane. The result of this will determine whether the pane is evaluated to emit results.

Specified by:

onElement in class Trigger<Object,W extends Window>

Parameters:

element - The element that arrived.

timestamp - The timestamp of the element that arrived.

window - The window to which this pane belongs.

ctx - A context object that can be used to register timer callbacks.

Throws:

Exception

onEventTime

public TriggerResult onEventTime(long time,
                                 W window,
                                 Trigger.TriggerContext ctx)
                          throws Exception

Description copied from class: Trigger

Called when an event-time timer that was set using the trigger context fires.

Specified by:

onEventTime in class Trigger<Object,W extends Window>

Parameters:

time - The timestamp at which the timer fired.

ctx - A context object that can be used to register timer callbacks.

Throws:

Exception

onProcessingTime

public TriggerResult onProcessingTime(long time,
                                      W window,
                                      Trigger.TriggerContext ctx)
                               throws Exception

Description copied from class: Trigger

Called when a processing-time timer that was set using the trigger context fires.

Specified by:

onProcessingTime in class Trigger<Object,W extends Window>

Parameters:

time - The timestamp at which the timer fired.

ctx - A context object that can be used to register timer callbacks.

Throws:

Exception

clear

public void clear(W window,
                  Trigger.TriggerContext ctx)
           throws Exception

Description copied from class: Trigger

Clears any state that the trigger might still hold for the given window. This is called when a window is purged. Timers set using Trigger.TriggerContext.registerEventTimeTimer(long) and Trigger.TriggerContext.registerProcessingTimeTimer(long) should be deleted here as well as state acquired using Trigger.TriggerContext.getPartitionedState(StateDescriptor).

By default, this method does nothing.

Overrides:

clear in class Trigger<Object,W extends Window>

Throws:

Exception

getInterval

public long getInterval()

toString

public String toString()

Overrides:

toString in class Object

of

public static <W extends Window> ContinuousProcessingTimeTrigger<W> of(Time interval)

Creates a trigger that continuously fires based on the given interval.

Type Parameters:

W - The type of Windows on which this trigger can operate.

Parameters:

interval - The time interval at which to fire.