org.apache.beam.sdk.transforms

Class PeriodicImpulse

java.lang.Object

org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<Instant>>

org.apache.beam.sdk.transforms.PeriodicImpulse

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

public class PeriodicImpulse
extends PTransform<PBegin,PCollection<Instant>>

A PTransform which produces a sequence of elements at fixed runtime intervals.

If applyWindowing() is specified, each element will be assigned to its own fixed window.

See PeriodicSequence.

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.beam.sdk.transforms.PTransform

name, resourceHints

Method Summary

Modifier and Type	Method and Description
PeriodicImpulse	applyWindowing()
static PeriodicImpulse	create()
PCollection<Instant>	expand(PBegin input) Override this method to specify how this PTransform should be expanded on the given InputT.
PeriodicImpulse	startAt(Instant startTime)
PeriodicImpulse	stopAt(Instant stopTime)
PeriodicImpulse	withInterval(Duration interval)

Methods inherited from class org.apache.beam.sdk.transforms.PTransform

compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate

Methods inherited from class java.lang.Object

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

Method Detail

create

public static PeriodicImpulse create()

startAt

public PeriodicImpulse startAt(Instant startTime)

stopAt

public PeriodicImpulse stopAt(Instant stopTime)

withInterval

public PeriodicImpulse withInterval(Duration interval)

applyWindowing

public PeriodicImpulse applyWindowing()

expand

public PCollection<Instant> expand(PBegin input)

Description copied from class: PTransform

Override this method to specify how this PTransform should be expanded on the given InputT.

NOTE: This method should not be called directly. Instead apply the PTransform should be applied to the InputT using the apply method.

Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).

Specified by:

expand in class PTransform<PBegin,PCollection<Instant>>