org.apache.flink.streaming.api.operators

Class StreamFold<IN,OUT>

java.lang.Object

org.apache.flink.streaming.api.operators.AbstractStreamOperator<OUT>

org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator<OUT,org.apache.flink.api.common.functions.FoldFunction<IN,OUT>>

org.apache.flink.streaming.api.operators.StreamFold<IN,OUT>

All Implemented Interfaces:

Serializable, OneInputStreamOperator<IN,OUT>, StatefulStreamOperator<OUT>, StreamOperator<OUT>

Direct Known Subclasses:

StreamGroupedFold

public class StreamFold<IN,OUT>
extends AbstractUdfStreamOperator<OUT,org.apache.flink.api.common.functions.FoldFunction<IN,OUT>>
implements OneInputStreamOperator<IN,OUT>

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.streaming.api.operators.StreamOperator

StreamOperator.ChainingStrategy

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.flink.api.common.typeinfo.TypeInformation<OUT>	outTypeInformation
protected org.apache.flink.api.common.typeutils.TypeSerializer<OUT>	outTypeSerializer

Fields inherited from class org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator

userFunction

Fields inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

chainingStrategy, executionConfig, inputCopyDisabled, output, runtimeContext

Constructor Summary

Constructors

Constructor and Description
StreamFold(org.apache.flink.api.common.functions.FoldFunction<IN,OUT> folder, OUT initialValue, org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInformation)

Method Summary

Modifier and Type	Method and Description
void	open(org.apache.flink.configuration.Configuration config) This method is called before any elements are processed.
void	processElement(IN element)

Methods inherited from class org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator

close, confirmCheckpointCompleted, getStateSnapshotFromFunction, getUserFunction, restoreInitialState, setup

Methods inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

disableInputCopy, getChainingStrategy, isInputCopyingDisabled, setChainingStrategy

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.streaming.api.operators.StreamOperator

close, getChainingStrategy, isInputCopyingDisabled, setChainingStrategy, setup

Field Detail

outTypeSerializer

protected org.apache.flink.api.common.typeutils.TypeSerializer<OUT> outTypeSerializer

outTypeInformation

protected org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInformation

Constructor Detail

StreamFold

public StreamFold(org.apache.flink.api.common.functions.FoldFunction<IN,OUT> folder,
                  OUT initialValue,
                  org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInformation)

Method Detail

processElement

public void processElement(IN element)
                    throws Exception

Specified by:

processElement in interface OneInputStreamOperator<IN,OUT>

Throws:

Exception

open

public void open(org.apache.flink.configuration.Configuration config)
          throws Exception

Description copied from interface: StreamOperator

This method is called before any elements are processed.

Specified by:

open in interface StreamOperator<OUT>

Overrides:

open in class AbstractUdfStreamOperator<OUT,org.apache.flink.api.common.functions.FoldFunction<IN,OUT>>

Throws:

Exception