Package org.apache.beam.sdk.values

Interface PCollectionView<T>

Type Parameters:

T - the type of the value(s) accessible via this PCollectionView

All Superinterfaces:

PInput, POutput, PValue, java.io.Serializable

All Known Implementing Classes:

PCollectionViews.SimplePCollectionView

public interface PCollectionView<T>
extends PValue, java.io.Serializable

A PCollectionView<T> is an immutable view of a PCollection as a value of type T that can be accessed as a side input to a ParDo transform.

A PCollectionView should always be the output of a PTransform. It is the joint responsibility of this transform and each PipelineRunner to implement the view in a runner-specific manner.

The most common case is using the View transforms to prepare a PCollection for use as a side input to ParDo. See View.asSingleton(), View.asIterable(), and View.asMap() for more detail on specific views available in the SDK.

NOTE: View methods should not be considered to be user-accessible. They are implementation details of how a Runner obtains information required to construct a view, and are subject to change at any time.

Method Summary

Modifier and Type	Method	Description
Coder<?>	getCoderInternal()	Deprecated. this method will be removed entirely.
@Nullable PCollection<?>	getPCollection()	For internal use only.
TupleTag<?>	getTagInternal()	Deprecated. this method will be removed entirely.
ViewFn<?,T>	getViewFn()	Deprecated. this method will be removed entirely.
WindowingStrategy<?,?>	getWindowingStrategyInternal()	Deprecated. this method will be removed entirely.
WindowMappingFn<?>	getWindowMappingFn()	For internal use only.

Methods inherited from interface org.apache.beam.sdk.values.PInput

getPipeline

Methods inherited from interface org.apache.beam.sdk.values.POutput

finishSpecifyingOutput, getPipeline

Methods inherited from interface org.apache.beam.sdk.values.PValue

expand, finishSpecifying, getName

Method Detail

getPCollection

@Internal
@Nullable PCollection<?> getPCollection()

For internal use only.

Gets the PCollection this PCollectionView was created from.

The PCollection may not be available in all contexts.

getTagInternal

@Deprecated
@Internal
TupleTag<?> getTagInternal()

Deprecated.

this method will be removed entirely. The PCollection underlying a side input, is part of the side input's specification with a ParDo transform, which will obtain that information via a package-private channel.

For internal use only.

getViewFn

@Deprecated
@Internal
ViewFn<?,T> getViewFn()

Deprecated.

this method will be removed entirely. The ViewFn for a side input is an attribute of the side input's specification with a ParDo transform, which will obtain this specification via a package-private channel.

For internal use only.

getWindowMappingFn

@Experimental(CORE_RUNNERS_ONLY)
@Internal
WindowMappingFn<?> getWindowMappingFn()

For internal use only.

Returns the WindowMappingFn used to map windows from a main input to the side input of this PCollectionView.

getWindowingStrategyInternal

@Deprecated
@Internal
WindowingStrategy<?,?> getWindowingStrategyInternal()

Deprecated.

this method will be removed entirely. The PCollection underlying a side input, including its WindowingStrategy, is part of the side input's specification with a ParDo transform, which will obtain that information via a package-private channel.

For internal use only.

getCoderInternal

@Deprecated
@Internal
Coder<?> getCoderInternal()

Deprecated.

this method will be removed entirely. The PCollection underlying a side input, including its Coder, is part of the side input's specification with a ParDo transform, which will obtain that information via a package-private channel.

For internal use only.