com.google.cloud.dataflow.sdk.util

Class StreamingPCollectionViewWriterFn<T>

java.lang.Object

com.google.cloud.dataflow.sdk.transforms.DoFn<Iterable<T>,T>

com.google.cloud.dataflow.sdk.util.StreamingPCollectionViewWriterFn<T>

Type Parameters:

T - element type

All Implemented Interfaces:

DoFn.RequiresWindowAccess, Serializable

public class StreamingPCollectionViewWriterFn<T>
extends DoFn<Iterable<T>,T>
implements DoFn.RequiresWindowAccess

Utility DoFn for writing streaming PCollectionViews.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.google.cloud.dataflow.sdk.transforms.DoFn

DoFn.Context, DoFn.ProcessContext, DoFn.RequiresWindowAccess

Method Summary

Modifier and Type	Method and Description
static <T> StreamingPCollectionViewWriterFn<T>	create(PCollectionView<?> view, Coder<T> dataCoder)
void	processElement(DoFn.ProcessContext c) Processes one input element.

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

createAggregator, createAggregator, finishBundle, getAllowedTimestampSkew, getInputTypeDescriptor, getOutputTypeDescriptor, startBundle

Methods inherited from class java.lang.Object

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

Method Detail

create

public static <T> StreamingPCollectionViewWriterFn<T> create(PCollectionView<?> view,
                                                             Coder<T> dataCoder)

processElement

public void processElement(DoFn.ProcessContext c)
                    throws Exception

Description copied from class: DoFn

Processes one input element.

The current element of the input PCollection is returned by c.element(). It should be considered immutable. The Dataflow runtime will not mutate the element, so it is safe to cache, etc. The element should not be mutated by any of the DoFn methods, because it may be cached elsewhere, retained by the Dataflow runtime, or used in other unspecified ways.

A value is added to the main output PCollection by DoFn.Context.output(OutputT). Once passed to output the element should be considered immutable and not be modified in any way. It may be cached elsewhere, retained by the Dataflow runtime, or used in other unspecified ways.

Specified by:

processElement in class DoFn<Iterable<T>,T>

Throws:

Exception

See Also:

DoFn.ProcessContext