org.apache.beam.sdk.transforms.windowing

Class ReshuffleTrigger<W extends BoundedWindow>

java.lang.Object

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

org.apache.beam.sdk.transforms.windowing.ReshuffleTrigger<W>

Type Parameters:

W - The kind of window that is being reshuffled.

All Implemented Interfaces:

java.io.Serializable

@Internal
public class ReshuffleTrigger<W extends BoundedWindow>
extends Trigger

For internal use only; no backwards compatibility guarantees.

The trigger used with Reshuffle which triggers on every element and never buffers state.

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

Constructor Summary

Constructors

Constructor and Description
ReshuffleTrigger()

Method Summary

Modifier and Type	Method and Description
protected Trigger	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.
boolean	mayFinish() For internal use only; no backwards-compatibility guarantees.
java.lang.String	toString()

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

equals, getContinuationTrigger, hashCode, isCompatible, orFinally, subTriggers

Methods inherited from class java.lang.Object

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

Constructor Detail

ReshuffleTrigger

public ReshuffleTrigger()

Method Detail

getContinuationTrigger

protected Trigger 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.

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

mayFinish

public boolean mayFinish()

Description copied from class: Trigger

For internal use only; no backwards-compatibility guarantees.

Indicates whether this trigger may "finish". A top level trigger that finishes can cause data loss, so is rejected by GroupByKey validation.

Specified by:

mayFinish in class Trigger

toString

public java.lang.String toString()

Overrides:

toString in class Trigger