org.apache.flink.streaming.api.operators

Interface StatefulStreamOperator<OUT>

Type Parameters:

OUT - The output type of the operator

All Superinterfaces:

Serializable, StreamOperator<OUT>

All Known Implementing Classes:

AbstractUdfStreamOperator, CoStreamFlatMap, CoStreamGroupedReduce, CoStreamMap, CoStreamReduce, CoStreamWindow, ParallelMergeOperator, StreamFilter, StreamFlatMap, StreamFold, StreamGroupedFold, StreamGroupedReduce, StreamMap, StreamReduce, StreamSink, StreamSource, WindowFolder, WindowMapper, WindowReducer

public interface StatefulStreamOperator<OUT>
extends StreamOperator<OUT>

Interface for Stream operators that can have state. This interface is used for checkpointing and restoring that state.

Nested Class Summary

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

StreamOperator.ChainingStrategy

Method Summary

Modifier and Type	Method and Description
void	confirmCheckpointCompleted(long checkpointId, long timestamp)
Serializable	getStateSnapshotFromFunction(long checkpointId, long timestamp)
void	restoreInitialState(Serializable state)

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

close, getChainingStrategy, isInputCopyingDisabled, open, setChainingStrategy, setup

Method Detail

restoreInitialState

void restoreInitialState(Serializable state)
                  throws Exception

Throws:

Exception

getStateSnapshotFromFunction

Serializable getStateSnapshotFromFunction(long checkpointId,
                                          long timestamp)
                                   throws Exception

Throws:

Exception

confirmCheckpointCompleted

void confirmCheckpointCompleted(long checkpointId,
                                long timestamp)
                         throws Exception

Throws:

Exception