Package org.apache.flink.streaming.api.windowing.assigners

Class GlobalWindows.NeverTrigger

java.lang.Object

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

org.apache.flink.streaming.api.windowing.assigners.GlobalWindows.NeverTrigger

All Implemented Interfaces:

Serializable

Enclosing class:

GlobalWindows

@Internal
public static class GlobalWindows.NeverTrigger
extends Trigger<Object,GlobalWindow>

A trigger that never fires, as default Trigger for GlobalWindows.

See Also:

• Serialized Form

Nested Class Summary

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

Trigger.OnMergeContext, Trigger.TriggerContext

Constructor Summary

Constructors

Constructor	Description
NeverTrigger()

Method Summary

Modifier and Type	Method	Description
void	clear(GlobalWindow window, Trigger.TriggerContext ctx)	Clears any state that the trigger might still hold for the given window.
TriggerResult	onElement(Object element, long timestamp, GlobalWindow window, Trigger.TriggerContext ctx)	Called for every element that gets added to a pane.
TriggerResult	onEventTime(long time, GlobalWindow window, Trigger.TriggerContext ctx)	Called when an event-time timer that was set using the trigger context fires.
void	onMerge(GlobalWindow window, Trigger.OnMergeContext ctx)	Called when several windows have been merged into one window by the WindowAssigner.
TriggerResult	onProcessingTime(long time, GlobalWindow window, Trigger.TriggerContext ctx)	Called when a processing-time timer that was set using the trigger context fires.

Methods inherited from class org.apache.flink.streaming.api.windowing.triggers.Trigger

canMerge

Methods inherited from class java.lang.Object

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

Constructor Details

NeverTrigger

public NeverTrigger()

Method Details

onElement

public TriggerResult onElement(Object element,
 long timestamp,
 GlobalWindow window,
 Trigger.TriggerContext ctx)

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,GlobalWindow>

Parameters:

element - The element that arrived.

timestamp - The timestamp of the element that arrived.

window - The window to which the element is being added.

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

onEventTime

public TriggerResult onEventTime(long time,
 GlobalWindow window,
 Trigger.TriggerContext ctx)

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,GlobalWindow>

Parameters:

time - The timestamp at which the timer fired.

window - The window for which the timer fired.

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

onProcessingTime

public TriggerResult onProcessingTime(long time,
 GlobalWindow window,
 Trigger.TriggerContext ctx)

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,GlobalWindow>

Parameters:

time - The timestamp at which the timer fired.

window - The window for which the timer fired.

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

clear

public void clear(GlobalWindow 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).

Specified by:

clear in class Trigger<Object,GlobalWindow>

Throws:

Exception

onMerge

public void onMerge(GlobalWindow window,
 Trigger.OnMergeContext ctx)

Description copied from class: Trigger

Called when several windows have been merged into one window by the WindowAssigner.

Overrides:

onMerge in class Trigger<Object,GlobalWindow>

Parameters:

window - The new window that results from the merge.

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