org.apache.flink.streaming.api.datastream

Class BroadcastStream<T>

java.lang.Object

org.apache.flink.streaming.api.datastream.BroadcastStream<T>

Type Parameters:

T - The type of input/output elements.

@PublicEvolving
public class BroadcastStream<T>
extends Object

A BroadcastStream is a stream with broadcast state(s). This can be created by any stream using the DataStream.broadcast(MapStateDescriptor[]) method and implicitly creates states where the user can store elements of the created BroadcastStream. (see BroadcastConnectedStream).

Note that no further operation can be applied to these streams. The only available option is to connect them with a keyed or non-keyed stream, using the DataStream.connect(BroadcastStream) and the DataStream.connect(BroadcastStream) respectively. Applying these methods will result it a BroadcastConnectedStream for further processing.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BroadcastStream(StreamExecutionEnvironment env, DataStream<T> input, MapStateDescriptor<?,?>... broadcastStateDescriptors)

Method Summary

Modifier and Type	Method and Description
<F> F	clean(F f)
List<MapStateDescriptor<?,?>>	getBroadcastStateDescriptor()
StreamExecutionEnvironment	getEnvironment()
StreamTransformation<T>	getTransformation()
TypeInformation<T>	getType()

Methods inherited from class java.lang.Object

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

Constructor Detail

BroadcastStream

protected BroadcastStream(StreamExecutionEnvironment env,
                          DataStream<T> input,
                          MapStateDescriptor<?,?>... broadcastStateDescriptors)

Method Detail

getType

public TypeInformation<T> getType()

clean

public <F> F clean(F f)

getTransformation

public StreamTransformation<T> getTransformation()

getBroadcastStateDescriptor

public List<MapStateDescriptor<?,?>> getBroadcastStateDescriptor()

getEnvironment

public StreamExecutionEnvironment getEnvironment()