com.google.cloud.dataflow.examples

Class WordCount.CountWords

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.PTransform<PCollection<String>,PCollection<KV<String,Long>>>

com.google.cloud.dataflow.examples.WordCount.CountWords

All Implemented Interfaces:

Serializable

Enclosing class:

WordCount

public static class WordCount.CountWords
extends PTransform<PCollection<String>,PCollection<KV<String,Long>>>

A PTransform that converts a PCollection containing lines of text into a PCollection of formatted word counts.

Concept #3: This is a custom composite transform that bundles two transforms (ParDo and Count) as a reusable PTransform subclass. Using composite transforms allows for easy reuse, modular testing, and an improved monitoring experience.

See Also:

Serialized Form

Field Summary

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

name

Constructor Summary

Constructors

Constructor and Description
CountWords()

Method Summary

Modifier and Type	Method and Description
PCollection<KV<String,Long>>	apply(PCollection<String> lines)

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

getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, toString, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

CountWords

public CountWords()

Method Detail

apply

public PCollection<KV<String,Long>> apply(PCollection<String> lines)

Overrides:

apply in class PTransform<PCollection<String>,PCollection<KV<String,Long>>>