org.apache.beam.sdk.transforms.windowing

Class AfterPane

java.lang.Object

org.apache.beam.sdk.transforms.windowing.Trigger

org.apache.beam.sdk.transforms.windowing.Trigger.OnceTrigger

org.apache.beam.sdk.transforms.windowing.AfterPane

All Implemented Interfaces:

java.io.Serializable

@Experimental(value=TRIGGER)
public class AfterPane
extends Trigger.OnceTrigger

A Trigger that fires at some point after a specified number of input elements have arrived.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.beam.sdk.transforms.windowing.Trigger

Trigger.OnceTrigger

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.windowing.Trigger

subTriggers

Method Summary

Modifier and Type	Method and Description
static AfterPane	elementCountAtLeast(int countElems) Creates a trigger that fires when the pane contains at least countElems elements.
boolean	equals(java.lang.Object obj)
protected Trigger.OnceTrigger	getContinuationTrigger(java.util.List<Trigger> continuationTriggers) Subclasses should override this to return the Trigger.getContinuationTrigger() of this Trigger.
int	getElementCount() The number of elements after which this trigger may fire.
Instant	getWatermarkThatGuaranteesFiring(BoundedWindow window) For internal use only; no backwards-compatibility guarantees.
int	hashCode()
boolean	isCompatible(Trigger other) For internal use only; no backwards-compatibility guarantees.
java.lang.String	toString()

Methods inherited from class org.apache.beam.sdk.transforms.windowing.Trigger.OnceTrigger

getContinuationTrigger, mayFinish

Methods inherited from class org.apache.beam.sdk.transforms.windowing.Trigger

orFinally, subTriggers

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

getElementCount

public int getElementCount()

The number of elements after which this trigger may fire.

elementCountAtLeast

public static AfterPane elementCountAtLeast(int countElems)

Creates a trigger that fires when the pane contains at least countElems elements.

isCompatible

public boolean isCompatible(Trigger other)

Description copied from class: Trigger

For internal use only; no backwards-compatibility guarantees.

Returns whether this performs the same triggering as the given Trigger.

Overrides:

isCompatible in class Trigger

getWatermarkThatGuaranteesFiring

public Instant getWatermarkThatGuaranteesFiring(BoundedWindow window)

Description copied from class: Trigger

For internal use only; no backwards-compatibility guarantees.

Returns a bound in event time by which this trigger would have fired at least once for a given window had there been input data.

For triggers that do not fire based on the watermark advancing, returns BoundedWindow.TIMESTAMP_MAX_VALUE.

This estimate may be used, for example, to determine that there are no elements in a side-input window, which causes the default value to be used instead.

Specified by:

getWatermarkThatGuaranteesFiring in class Trigger

getContinuationTrigger

protected Trigger.OnceTrigger getContinuationTrigger(java.util.List<Trigger> continuationTriggers)

Description copied from class: Trigger

Subclasses should override this to return the Trigger.getContinuationTrigger() of this Trigger. For convenience, this is provided the continuation trigger of each of the sub-triggers in the same order as Trigger.subTriggers.

Specified by:

getContinuationTrigger in class Trigger

Parameters:

continuationTriggers - null if Trigger.subTriggers is null, otherwise contains the result of Trigger.getContinuationTrigger() on each of the subTriggers in the same order.

toString

public java.lang.String toString()

Overrides:

toString in class Trigger

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class Trigger

hashCode

public int hashCode()

Overrides:

hashCode in class Trigger