KeyedPCollectionTuple (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Cloud Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. See Migrating from Cloud Dataflow SDK 1.x for Java for migration guidance.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

com.google.cloud.dataflow.sdk.transforms.join

Class KeyedPCollectionTuple<K>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.transforms.join.KeyedPCollectionTuple<K>

• Type Parameters:

  K - the type of key shared by all constituent PCollections

  All Implemented Interfaces:

  PInput

  ---

  
  

  public class KeyedPCollectionTuple<K>
  extends Object
  implements PInput

  An immutable tuple of keyed PCollections with key type K. (PCollections containing values of type KV<K, ?>)

• • Nested Class Summary

    Nested Classes 

    Modifier and Type	Class and Description
    static class	KeyedPCollectionTuple.TaggedKeyedPCollection<K,V> A utility class to help ensure coherence of tag and input PCollection types.

  • Method Summary

    All Methods Static Methods Instance Methods Concrete Methods 

    Modifier and Type	Method and Description
    <V> KeyedPCollectionTuple<K>	and(TupleTag<V> tag, PCollection<KV<K,V>> pc) Returns a new KeyedPCollectionTuple<K> that is the same as this, appended with the given PCollection.
    <OutputT extends POutput> OutputT	apply(PTransform<KeyedPCollectionTuple<K>,OutputT> transform) Like apply(String, PTransform) but defaulting to the name provided by the PTransform.
    <OutputT extends POutput> OutputT	apply(String name, PTransform<KeyedPCollectionTuple<K>,OutputT> transform) Applies the given PTransform to this input KeyedPCollectionTuple and returns its OutputT.
    static <K> KeyedPCollectionTuple<K>	empty(Pipeline pipeline) Returns an empty KeyedPCollectionTuple<K> on the given pipeline.
    Collection<? extends PValue>	expand() Expands the component PCollections, stripping off any tag-specific information.
    void	finishSpecifying() After building, finalizes this PInput to make it ready for being used as an input to a PTransform.
    CoGbkResultSchema	getCoGbkResultSchema() Returns the CoGbkResultSchema associated with this KeyedPCollectionTuple.
    Coder<K>	getKeyCoder() Returns the key Coder for all PCollections in this KeyedPCollectionTuple.
    List<KeyedPCollectionTuple.TaggedKeyedPCollection<K,?>>	getKeyedCollections() Returns a list of TaggedKeyedPCollections for the PCollections contained in this KeyedPCollectionTuple.
    Pipeline	getPipeline() Returns the owning Pipeline of this PInput.
    boolean	isEmpty()
    static <K,InputT> KeyedPCollectionTuple<K>	of(TupleTag<InputT> tag, PCollection<KV<K,InputT>> pc) Returns a new KeyedPCollectionTuple<K> with the given tag and initial PCollection.

    • Methods inherited from class java.lang.Object

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

• • Method Detail

    • empty

      public static <K> KeyedPCollectionTuple<K> empty(Pipeline pipeline)

      Returns an empty KeyedPCollectionTuple<K> on the given pipeline.

    • of

      public static <K,InputT> KeyedPCollectionTuple<K> of(TupleTag<InputT> tag,
                                                           PCollection<KV<K,InputT>> pc)

      Returns a new KeyedPCollectionTuple<K> with the given tag and initial PCollection.

    • and

      public <V> KeyedPCollectionTuple<K> and(TupleTag<V> tag,
                                              PCollection<KV<K,V>> pc)

      Returns a new KeyedPCollectionTuple<K> that is the same as this, appended with the given PCollection.

    • isEmpty

      public boolean isEmpty()

    • getKeyedCollections

      public List<KeyedPCollectionTuple.TaggedKeyedPCollection<K,?>> getKeyedCollections()

      Returns a list of TaggedKeyedPCollections for the PCollections contained in this KeyedPCollectionTuple.

    • apply

      public <OutputT extends POutput> OutputT apply(PTransform<KeyedPCollectionTuple<K>,OutputT> transform)

      Like apply(String, PTransform) but defaulting to the name provided by the PTransform.

    • apply

      public <OutputT extends POutput> OutputT apply(String name,
                                                     PTransform<KeyedPCollectionTuple<K>,OutputT> transform)

      Applies the given PTransform to this input KeyedPCollectionTuple and returns its OutputT. This uses name to identify the specific application of the transform. This name is used in various places, including the monitoring UI, logging, and to stably identify this application node in the job graph.

    • expand

      public Collection<? extends PValue> expand()

      Expands the component PCollections, stripping off any tag-specific information.

      Specified by:

      expand in interface PInput

    • getKeyCoder

      public Coder<K> getKeyCoder()

      Returns the key Coder for all PCollections in this KeyedPCollectionTuple.

    • getCoGbkResultSchema

      public CoGbkResultSchema getCoGbkResultSchema()

      Returns the CoGbkResultSchema associated with this KeyedPCollectionTuple.

    • getPipeline

      public Pipeline getPipeline()

      Description copied from interface: PInput
      Returns the owning Pipeline of this PInput.

      Specified by:

      getPipeline in interface PInput

    • finishSpecifying

      public void finishSpecifying()

      Description copied from interface: PInput
      After building, finalizes this PInput to make it ready for being used as an input to a PTransform.

      Automatically invoked whenever apply() is invoked on this PInput, so users do not normally call this explicitly.

      Specified by:

      finishSpecifying in interface PInput