org.apache.beam.sdk.testing

Class TestStream<T>

java.lang.Object

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

org.apache.beam.sdk.testing.TestStream<T>

All Implemented Interfaces:

java.io.Serializable, HasDisplayData

public final class TestStream<T>
extends PTransform<PBegin,PCollection<T>>

A testing input that generates an unbounded PCollection of elements, advancing the watermark and processing time as elements are emitted. After all of the specified elements are emitted, ceases to produce output.

Each call to a TestStream.Builder method will only be reflected in the state of the Pipeline after each method before it has completed and no more progress can be made by the Pipeline. A PipelineRunner must ensure that no more progress can be made in the Pipeline before advancing the state of the TestStream.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TestStream.Builder<T> An incomplete TestStream.
static class	TestStream.ElementEvent<T> A TestStream.Event that produces elements.
static interface	TestStream.Event<T> An event in a TestStream.
static class	TestStream.EventType The types of TestStream.Event that are supported by TestStream.
static class	TestStream.ProcessingTimeEvent<T> A TestStream.Event that advances the processing time clock.
static class	TestStream.WatermarkEvent<T> A TestStream.Event that advances the watermark.

Field Summary

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

name

Method Summary

Modifier and Type	Method and Description
static <T> TestStream.Builder<T>	create(Coder<T> coder) Create a new TestStream.Builder with no elements and watermark equal to BoundedWindow.TIMESTAMP_MIN_VALUE.
PCollection<T>	expand(PBegin input) Applies this PTransform on the given InputT, and returns its Output.
java.util.List<TestStream.Event<T>>	getEvents() Returns the sequence of Events in this TestStream.
Coder<T>	getValueCoder()

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

getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, populateDisplayData, toString, validate

Methods inherited from class java.lang.Object

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

Method Detail

create

public static <T> TestStream.Builder<T> create(Coder<T> coder)

Create a new TestStream.Builder with no elements and watermark equal to BoundedWindow.TIMESTAMP_MIN_VALUE.

expand

public PCollection<T> expand(PBegin input)

Description copied from class: PTransform

Applies this PTransform on the given InputT, and returns its Output.

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<T>>

getValueCoder

public Coder<T> getValueCoder()

getEvents

public java.util.List<TestStream.Event<T>> getEvents()

Returns the sequence of Events in this TestStream.

For use by PipelineRunner authors.