com.google.cloud.dataflow.sdk.values (Google Cloud Dataflow SDK 1.9.0 API)

Package com.google.cloud.dataflow.sdk.values

Defines PCollection and other classes for representing data in a Pipeline.

See: Description

• Interface Summary 

  Interface	Description
  PCollectionView<T>	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.
  PInput	The interface for things that might be input to a PTransform.
  POutput	The interface for things that might be output from a PTransform.
  PValue	The interface for values that can be input to and output from PTransforms.

• Class Summary 

  Class	Description
  KV<K,V>	An immutable key/value pair.
  KV.OrderByKey<K extends Comparable<? super K>,V>	A Comparator that orders KVs by the natural ordering of their keys.
  KV.OrderByValue<K,V extends Comparable<? super V>>	A Comparator that orders KVs by the natural ordering of their values.
  PBegin	PBegin is the "input" to a root PTransform, such as Read or Create.
  PCollection<T>	A PCollection<T> is an immutable collection of values of type T.
  PCollectionList<T>	A PCollectionList<T> is an immutable list of homogeneously typed PCollection<T>s.
  PCollectionTuple	A PCollectionTuple is an immutable tuple of heterogeneously-typed PCollections, "keyed" by TupleTags.
  PDone	PDone is the output of a PTransform that has a trivial result, such as a Write.
  POutputValueBase	A POutputValueBase is the abstract base class of PTransform outputs.
  PValueBase	A PValueBase is an abstract base class that provides sensible default implementations for methods of PValue.
  TimestampedValue<V>	An immutable pair of a value and a timestamp.
  TimestampedValue.TimestampedValueCoder<T>	A Coder for TimestampedValue.
  TupleTag<V>	A TupleTag is a typed tag to use as the key of a heterogeneously typed tuple, like PCollectionTuple.
  TupleTagList	A TupleTagList is an immutable list of heterogeneously typed TupleTags.
  TypeDescriptor<T>	A description of a Java type, including actual generic parameters where possible.
  TypedPValue<T>	A TypedPValue<T> is the abstract base class of things that store some number of values of type T.

• Enum Summary 

  Enum	Description
  PCollection.IsBounded	The enumeration of cases for whether a PCollection is bounded.

Package com.google.cloud.dataflow.sdk.values Description

Defines PCollection and other classes for representing data in a Pipeline.

In particular, see these collection abstractions:

• PCollection - an immutable collection of values of type T and the main representation for data in Dataflow.
• PCollectionView - an immutable view of a PCollection that can be accessed as a side input of a ParDo PTransform.
• PCollectionTuple - a heterogeneous tuple of PCollections used in cases where a PTransform takes or returns multiple PCollections.
• PCollectionList - a homogeneous list of PCollections used, for example, as input to Flatten.

And these classes for individual values play particular roles in Dataflow:

• KV - a key/value pair that is used by keyed transforms, most notably GroupByKey.
• TimestampedValue - a timestamp/value pair that is used for windowing and handling out-of-order data in streaming execution.

For further details, see the documentation for each class in this package.