org.apache.beam.sdk.transforms.windowing

Class AfterFirst

java.lang.Object

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

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

org.apache.beam.sdk.transforms.windowing.AfterFirst

All Implemented Interfaces:

java.io.Serializable

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

A composite Trigger that fires once after at least one of its sub-triggers have fired.

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
protected Trigger.OnceTrigger	getContinuationTrigger(java.util.List<Trigger> continuationTriggers) Subclasses should override this to return the Trigger.getContinuationTrigger() of this Trigger.
Instant	getWatermarkThatGuaranteesFiring(BoundedWindow window) For internal use only; no backwards-compatibility guarantees.
static AfterFirst	of(java.util.List<Trigger> triggers) Returns an AfterFirst Trigger with the given subtriggers.
static AfterFirst	of(Trigger.OnceTrigger... triggers) Returns an AfterFirst Trigger with the given subtriggers.
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

equals, hashCode, isCompatible, orFinally, subTriggers

Methods inherited from class java.lang.Object

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

Method Detail

of

public static AfterFirst of(Trigger.OnceTrigger... triggers)

Returns an AfterFirst Trigger with the given subtriggers.

of

public static AfterFirst of(java.util.List<Trigger> triggers)

Returns an AfterFirst Trigger with the given subtriggers.

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 - 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