com.google.cloud.dataflow.sdk.util

Class AssignWindowsDoFn<T,W extends BoundedWindow>

java.lang.Object

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

com.google.cloud.dataflow.sdk.util.AssignWindowsDoFn<T,W>

Type Parameters:

T - Type of elements being windowed

W - Window type

All Implemented Interfaces:

Serializable

@SystemDoFnInternal
public class AssignWindowsDoFn<T,W extends BoundedWindow>
extends DoFn<T,T>

DoFn that tags elements of a PCollection with windows, according to the provided WindowFn.

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

Constructor Summary

Constructors

Constructor and Description
AssignWindowsDoFn(WindowFn<? super T,W> fn)

Method Summary

Modifier and Type	Method and Description
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

Constructor Detail

AssignWindowsDoFn

public AssignWindowsDoFn(WindowFn<? super T,W> fn)

Method Detail

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<T,T>

Throws:

Exception

See Also:

DoFn.ProcessContext