com.google.cloud.dataflow.sdk.transforms

Class GroupByKey.GroupAlsoByWindow<K,V>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<KV<K,Iterable<com.google.cloud.dataflow.sdk.util.WindowedValue<V>>>>,PCollection<KV<K,Iterable<V>>>>

com.google.cloud.dataflow.sdk.transforms.GroupByKey.GroupAlsoByWindow<K,V>

All Implemented Interfaces:

HasDisplayData, Serializable

Enclosing class:

GroupByKey<K,V>

public static class GroupByKey.GroupAlsoByWindow<K,V>
extends PTransform<PCollection<KV<K,Iterable<com.google.cloud.dataflow.sdk.util.WindowedValue<V>>>>,PCollection<KV<K,Iterable<V>>>>

Helper transform that takes a collection of timestamp-ordered values associated with each key, groups the values by window, combines windows as needed, and for each window in each key, outputs a collection of key/value-list pairs implicitly assigned to the window and with the timestamp derived from that window.

See Also:

Serialized Form

Field Summary

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

name

Constructor Summary

Constructors

Constructor and Description
GroupAlsoByWindow(com.google.cloud.dataflow.sdk.util.WindowingStrategy<?,?> windowingStrategy)

Method Summary

Modifier and Type	Method and Description
PCollection<KV<K,Iterable<V>>>	apply(PCollection<KV<K,Iterable<com.google.cloud.dataflow.sdk.util.WindowedValue<V>>>> input) Applies this PTransform on the given InputT, and returns its Output.

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

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

Constructor Detail

GroupAlsoByWindow

public GroupAlsoByWindow(com.google.cloud.dataflow.sdk.util.WindowingStrategy<?,?> windowingStrategy)

Method Detail

apply

public PCollection<KV<K,Iterable<V>>> apply(PCollection<KV<K,Iterable<com.google.cloud.dataflow.sdk.util.WindowedValue<V>>>> 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).

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<InputT, OutputT>, InputT).

Overrides:

apply in class PTransform<PCollection<KV<K,Iterable<com.google.cloud.dataflow.sdk.util.WindowedValue<V>>>>,PCollection<KV<K,Iterable<V>>>>