org.apache.flink.streaming.api.transformations

Class UnionTransformation<T>

java.lang.Object

org.apache.flink.streaming.api.transformations.StreamTransformation<T>

org.apache.flink.streaming.api.transformations.UnionTransformation<T>

Type Parameters:

T - The type of the elements that result from this UnionTransformation

@Internal
public class UnionTransformation<T>
extends StreamTransformation<T>

This transformation represents a union of several input StreamTransformations.

This does not create a physical operation, it only affects how upstream operations are connected to downstream operations.

Field Summary

Fields inherited from class org.apache.flink.streaming.api.transformations.StreamTransformation

bufferTimeout, id, idCounter, name, outputType, typeUsed

Constructor Summary

Constructors

Constructor and Description
UnionTransformation(List<StreamTransformation<T>> inputs) Creates a new UnionTransformation from the given input StreamTransformations.

Method Summary

Modifier and Type	Method and Description
List<StreamTransformation<T>>	getInputs() Returns the list of input StreamTransformations.
Collection<StreamTransformation<?>>	getTransitivePredecessors() Returns all transitive predecessor StreamTransformations of this StreamTransformation.
void	setChainingStrategy(ChainingStrategy strategy) Sets the chaining strategy of this StreamTransformation.

Methods inherited from class org.apache.flink.streaming.api.transformations.StreamTransformation

equals, getBufferTimeout, getId, getName, getNewNodeId, getOutputType, getParallelism, getSlotSharingGroup, getUid, hashCode, setBufferTimeout, setName, setOutputType, setParallelism, setSlotSharingGroup, setUid, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

UnionTransformation

public UnionTransformation(List<StreamTransformation<T>> inputs)

Creates a new UnionTransformation from the given input StreamTransformations.

The input StreamTransformations must all have the same type.

Parameters:

inputs - The list of input StreamTransformations

Method Detail

getInputs

public List<StreamTransformation<T>> getInputs()

Returns the list of input StreamTransformations.

getTransitivePredecessors

public Collection<StreamTransformation<?>> getTransitivePredecessors()

Description copied from class: StreamTransformation

Returns all transitive predecessor StreamTransformations of this StreamTransformation. This is, for example, used when determining whether a feedback edge of an iteration actually has the iteration head as a predecessor.

Specified by:

getTransitivePredecessors in class StreamTransformation<T>

Returns:

The list of transitive predecessors.

setChainingStrategy

public final void setChainingStrategy(ChainingStrategy strategy)

Description copied from class: StreamTransformation

Sets the chaining strategy of this StreamTransformation.

Specified by:

setChainingStrategy in class StreamTransformation<T>