org.apache.flink.streaming.api.operators

Class StreamGroupedReduce<IN>

java.lang.Object

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

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

org.apache.flink.streaming.api.operators.StreamGroupedReduce<IN>

All Implemented Interfaces:

Serializable, org.apache.flink.runtime.state.CheckpointListener, KeyContext, OneInputStreamOperator<IN,IN>, OutputTypeConfigurable<IN>, SetupableStreamOperator<IN>, StreamOperator<IN>, org.apache.flink.util.Disposable

@Internal
public class StreamGroupedReduce<IN>
extends AbstractUdfStreamOperator<IN,org.apache.flink.api.common.functions.ReduceFunction<IN>>
implements OneInputStreamOperator<IN,IN>

A StreamOperator for executing a ReduceFunction on a KeyedStream.

See Also:

Serialized Form

Nested Class Summary

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

AbstractStreamOperator.CountingOutput<OUT>

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, config, latencyStats, LOG, metrics, output, timeServiceManager

Constructor Summary

Constructors

Constructor and Description
StreamGroupedReduce(org.apache.flink.api.common.functions.ReduceFunction<IN> reducer, org.apache.flink.api.common.typeutils.TypeSerializer<IN> serializer)

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, e.g.
void	processElement(StreamRecord<IN> element) Processes one element that arrived at this operator.

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

close, dispose, getUserFunction, getUserFunctionParameters, initializeState, notifyCheckpointComplete, setOutputType, setup, snapshotState

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

getChainingStrategy, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getUserCodeClassloader, initializeState, numEventTimeTimers, numProcessingTimeTimers, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processWatermark, processWatermark1, processWatermark2, reportOrForwardLatencyMarker, setChainingStrategy, setCurrentKey, setKeyContextElement1, setKeyContextElement2, snapshotState

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.OneInputStreamOperator

processLatencyMarker, processWatermark

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

close, dispose, getChainingStrategy, getMetricGroup, getOperatorID, initializeState, prepareSnapshotPreBarrier, setChainingStrategy, setKeyContextElement1, setKeyContextElement2, snapshotState

Methods inherited from interface org.apache.flink.runtime.state.CheckpointListener

notifyCheckpointComplete

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

getCurrentKey, setCurrentKey

Constructor Detail

StreamGroupedReduce

public StreamGroupedReduce(org.apache.flink.api.common.functions.ReduceFunction<IN> reducer,
                           org.apache.flink.api.common.typeutils.TypeSerializer<IN> serializer)

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, e.g. state initialization.

The default implementation does nothing.

Specified by:

open in interface StreamOperator<IN>

Overrides:

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

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,IN>

Throws:

Exception