org.apache.beam.sdk.transforms.splittabledofn

Class WatermarkEstimators.Manual

java.lang.Object

org.apache.beam.sdk.transforms.splittabledofn.WatermarkEstimators.Manual

All Implemented Interfaces:

ManualWatermarkEstimator<Instant>, WatermarkEstimator<Instant>

Enclosing class:

WatermarkEstimators

public static class WatermarkEstimators.Manual
extends java.lang.Object
implements ManualWatermarkEstimator<Instant>

Concrete implementation of a ManualWatermarkEstimator.

Constructor Summary

Constructors

Constructor and Description
Manual(Instant watermark)

Method Summary

Modifier and Type	Method and Description
Instant	currentWatermark() Return estimated output watermark.
Instant	getState() Get current state of the WatermarkEstimator instance, which can be used to recreate the WatermarkEstimator when processing the restriction.
void	setWatermark(Instant watermark) Sets a timestamp before or at the timestamps of all future elements produced by the associated DoFn.

Methods inherited from class java.lang.Object

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

Constructor Detail

Manual

public Manual(Instant watermark)

Method Detail

setWatermark

public void setWatermark(Instant watermark)

Description copied from interface: ManualWatermarkEstimator

Sets a timestamp before or at the timestamps of all future elements produced by the associated DoFn.

This can be approximate. If records are output that violate this guarantee, they will be considered late, which will affect how they will be processed. See watermarks and late data for more information on late data and how to handle it.

However, this value should be as late as possible. Downstream windows may not be able to close until this watermark passes their end.

Specified by:

setWatermark in interface ManualWatermarkEstimator<Instant>

currentWatermark

public Instant currentWatermark()

Description copied from interface: WatermarkEstimator

Return estimated output watermark. This method must return monotonically increasing watermarks across instances that are constructed from prior state.

Specified by:

currentWatermark in interface WatermarkEstimator<Instant>

getState

public Instant getState()

Description copied from interface: WatermarkEstimator

Get current state of the WatermarkEstimator instance, which can be used to recreate the WatermarkEstimator when processing the restriction. See DoFn.NewWatermarkEstimator for additional details.

The internal state of the estimator must not be mutated by this method.

The state returned must not be mutated.

Specified by:

getState in interface WatermarkEstimator<Instant>