com.google.cloud.dataflow.sdk.transforms.windowing

Class Window.Bound<T>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<T>,PCollection<T>>

com.google.cloud.dataflow.sdk.transforms.windowing.Window.Bound<T>

Type Parameters:

T - The type of elements this Window is applied to

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

Window

public static class Window.Bound<T>
extends PTransform<PCollection<T>,PCollection<T>>

A PTransform that windows the elements of a PCollection<T>, into finite windows according to a user-specified WindowFn<T, B>.

See Also:

Serialized Form

Field Summary

Fields inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

name

Method Summary

Methods

Modifier and Type	Method and Description
PCollection<T>	apply(PCollection<T> input) Applies this PTransform on the given Input, and returns its Output.
protected Coder<?>	getDefaultOutputCoder(PCollection<T> input) Returns the default Coder to use for the output of this single-output PTransform, or null if none can be inferred.
protected java.lang.String	getKindString() Returns a string describing what kind of PTransform this is.
com.google.cloud.dataflow.sdk.util.WindowingStrategy<? super T,?>	getWindowingStrategy()
Window.Bound<T>	named(java.lang.String name) Returns a new Window PTransform that's like this PTransform but with the specified name.
Window.Triggering<T>	triggering(Trigger<?> trigger) Sets a non-default trigger for this Window PTransform.

Methods inherited from class com.google.cloud.dataflow.sdk.transforms.PTransform

finishSpecifyingInternal, getDefaultName, getDefaultOutputCoder, getDefaultOutputCoder, getName, setName, setPipeline, toString, validate, withName

Methods inherited from class java.lang.Object

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

Method Detail

named

public Window.Bound<T> named(java.lang.String name)

Returns a new Window PTransform that's like this PTransform but with the specified name. Does not modify this PTransform.

See the discussion of Naming in ParDo for more explanation.

triggering

@Experimental(value=TRIGGER)
public Window.Triggering<T> triggering(Trigger<?> trigger)

Sets a non-default trigger for this Window PTransform. Elements that are assigned to a specific window will be output when the trigger fires.

Trigger has more details on the available triggers.

apply

public PCollection<T> apply(PCollection<T> input)

Description copied from class: PTransform

Applies this PTransform on the given Input, 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).

The default implementation throws an exception. A derived class must either implement apply, or else each runner must supply a custom implementation via PipelineRunner.apply(com.google.cloud.dataflow.sdk.transforms.PTransform<Input, Output>, Input).

Overrides:

apply in class PTransform<PCollection<T>,PCollection<T>>

getDefaultOutputCoder

protected Coder<?> getDefaultOutputCoder(PCollection<T> input)

Description copied from class: PTransform

Returns the default Coder to use for the output of this single-output PTransform, or null if none can be inferred.

By default, returns null.

Overrides:

getDefaultOutputCoder in class PTransform<PCollection<T>,PCollection<T>>

getWindowingStrategy

public com.google.cloud.dataflow.sdk.util.WindowingStrategy<? super T,?> getWindowingStrategy()

getKindString

protected java.lang.String getKindString()

Description copied from class: PTransform

Returns a string describing what kind of PTransform this is.

By default, returns the base name of this PTransform's class.

Overrides:

getKindString in class PTransform<PCollection<T>,PCollection<T>>