@Internal public class StreamGroupedFold<IN,OUT,KEY> extends AbstractUdfStreamOperator<OUT,FoldFunction<IN,OUT>> implements OneInputStreamOperator<IN,OUT>, OutputTypeConfigurable<OUT>
AbstractStreamOperator.CountingOutput
userFunction
chainingStrategy, LOG, metrics, output
Constructor and Description |
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StreamGroupedFold(FoldFunction<IN,OUT> folder,
OUT initialValue) |
Modifier and Type | Method and Description |
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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(TypeInformation<OUT> outTypeInfo,
ExecutionConfig executionConfig)
Is called by the
StreamGraph.addOperator(Integer, String, StreamOperator, TypeInformation, TypeInformation, String)
method when the StreamGraph is generated. |
close, dispose, getUserFunction, getUserFunctionParameters, notifyOfCompletedCheckpoint, restoreState, setup, snapshotOperatorState
getChainingStrategy, getContainingTask, getCurrentProcessingTime, getExecutionConfig, getMetricGroup, getOperatorConfig, getOperatorName, getPartitionedState, getPartitionedState, getRuntimeContext, getStateBackend, getUserCodeClassloader, registerTimer, setChainingStrategy, setKeyContext, setKeyContextElement1, setKeyContextElement2
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
close, dispose, getChainingStrategy, getMetricGroup, notifyOfCompletedCheckpoint, restoreState, setChainingStrategy, setKeyContextElement1, setKeyContextElement2, setup, snapshotOperatorState
public StreamGroupedFold(FoldFunction<IN,OUT> folder, OUT initialValue)
public void open() throws Exception
AbstractStreamOperator
The default implementation does nothing.
open
in interface StreamOperator<OUT>
open
in class AbstractUdfStreamOperator<OUT,FoldFunction<IN,OUT>>
Exception
- An exception in this method causes the operator to fail.public void processElement(StreamRecord<IN> element) throws Exception
OneInputStreamOperator
processElement
in interface OneInputStreamOperator<IN,OUT>
Exception
public void processWatermark(Watermark mark) throws Exception
OneInputStreamOperator
Watermark
.
This method is guaranteed to not be called concurrently with other methods of the operator.processWatermark
in interface OneInputStreamOperator<IN,OUT>
Exception
Watermark
public void setOutputType(TypeInformation<OUT> outTypeInfo, ExecutionConfig executionConfig)
OutputTypeConfigurable
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.setOutputType
in interface OutputTypeConfigurable<OUT>
setOutputType
in class AbstractUdfStreamOperator<OUT,FoldFunction<IN,OUT>>
outTypeInfo
- Output type information of the StreamTask
executionConfig
- Execution configurationCopyright © 2014–2017 The Apache Software Foundation. All rights reserved.