org.apache.flink.streaming.api.operators

Class StreamGroupedFold<IN,OUT,KEY>

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.StreamGroupedFold<IN,OUT,KEY>

All Implemented Interfaces:

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

@Internal
public class StreamGroupedFold<IN,OUT,KEY>
extends AbstractUdfStreamOperator<OUT,org.apache.flink.api.common.functions.FoldFunction<IN,OUT>>
implements OneInputStreamOperator<IN,OUT>, OutputTypeConfigurable<OUT>

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

AbstractStreamOperator.CountingOutput

Field Summary

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

userFunction

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

chainingStrategy, LOG, metrics, output

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	open() This method is called immediately before any elements are processed, it should contain the operator's initialization logic.
void	processElement(StreamRecord<IN> element) Processes one element that arrived at this operator.
void	processWatermark(Watermark mark) Processes a Watermark.
void	setOutputType(org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo, org.apache.flink.api.common.ExecutionConfig executionConfig) Is called by the StreamGraph.addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String) method when the StreamGraph is generated.

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

close, dispose, getUserFunction, getUserFunctionParameters, notifyOfCompletedCheckpoint, restoreState, setup, snapshotOperatorState

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

getChainingStrategy, getContainingTask, getCurrentProcessingTime, getExecutionConfig, getMetricGroup, getOperatorConfig, getPartitionedState, getPartitionedState, getRuntimeContext, getStateBackend, getUserCodeClassloader, registerTimer, setChainingStrategy, setKeyContext, setKeyContextElement1, setKeyContextElement2

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, dispose, getChainingStrategy, getMetricGroup, notifyOfCompletedCheckpoint, restoreState, setChainingStrategy, setKeyContextElement1, setKeyContextElement2, setup, snapshotOperatorState

Constructor Detail

StreamGroupedFold

public StreamGroupedFold(org.apache.flink.api.common.functions.FoldFunction<IN,OUT> folder,
                         OUT initialValue)

Method Detail

open

public void open()
          throws Exception

Description copied from class: AbstractStreamOperator

This method is called immediately before any elements are processed, it should contain the operator's initialization logic.

The default implementation does nothing.

Specified by:

open in interface StreamOperator<OUT>

Overrides:

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

Throws:

Exception - An exception in this method causes the operator to fail.

processElement

public void processElement(StreamRecord<IN> element)
                    throws Exception

Description copied from interface: OneInputStreamOperator

Processes one element that arrived at this operator. This method is guaranteed to not be called concurrently with other methods of the operator.

Specified by:

processElement in interface OneInputStreamOperator<IN,OUT>

Throws:

Exception

processWatermark

public void processWatermark(Watermark mark)
                      throws Exception

Description copied from interface: OneInputStreamOperator

Processes a Watermark. This method is guaranteed to not be called concurrently with other methods of the operator.

Specified by:

processWatermark in interface OneInputStreamOperator<IN,OUT>

Throws:

Exception

See Also:

Watermark

setOutputType

public void setOutputType(org.apache.flink.api.common.typeinfo.TypeInformation<OUT> outTypeInfo,
                          org.apache.flink.api.common.ExecutionConfig executionConfig)

Description copied from interface: OutputTypeConfigurable

Is called by the StreamGraph.addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String) method when the StreamGraph is generated. The method is called with the output TypeInformation which is also used for the StreamTask output serializer.

Specified by:

setOutputType in interface OutputTypeConfigurable<OUT>

Overrides:

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

Parameters:

outTypeInfo - Output type information of the StreamTask

executionConfig - Execution configuration