org.apache.flink.streaming.api.operators

Interface OneInputStreamOperator<IN,OUT>

Type Parameters:

IN - The input type of the operator

OUT - The output type of the operator

All Superinterfaces:

org.apache.flink.api.common.state.CheckpointListener, Input<IN>, KeyContext, Serializable, StreamOperator<OUT>

All Known Implementing Classes:

AsyncWaitOperator, BatchGroupedReduceOperator, CacheTransformationTranslator.IdentityStreamOperator, CacheTransformationTranslator.NoOpStreamOperator, CollectSinkOperator, ContinuousFileReaderOperator, EvictingWindowOperator, GenericWriteAheadSink, GlobalCommitterOperator, KeyedProcessOperator, KeyedSortPartitionOperator, LegacyKeyedProcessOperator, MapPartitionOperator, PartitionAggregateOperator, PartitionReduceOperator, ProcessOperator, QueryableAppendingStateOperator, QueryableValueStateOperator, SortPartitionOperator, StreamFilter, StreamFlatMap, StreamGroupedReduceOperator, StreamMap, StreamProject, StreamSink, TimestampsAndWatermarksOperator, WindowOperator

@PublicEvolving
public interface OneInputStreamOperator<IN,OUT>
extends StreamOperator<OUT>, Input<IN>

Interface for stream operators with one input. Use AbstractStreamOperator as a base class if you want to implement a custom operator.

Method Summary

Modifier and Type	Method and Description
default void	setKeyContextElement(StreamRecord<IN> record) Set the correct key context before processing the record.

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

close, finish, getMetricGroup, getOperatorAttributes, getOperatorID, initializeState, open, prepareSnapshotPreBarrier, setKeyContextElement1, setKeyContextElement2, snapshotState

Methods inherited from interface org.apache.flink.api.common.state.CheckpointListener

notifyCheckpointAborted, notifyCheckpointComplete

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

getCurrentKey, setCurrentKey

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

processElement, processLatencyMarker, processRecordAttributes, processWatermark, processWatermarkStatus

Method Detail

setKeyContextElement

default void setKeyContextElement(StreamRecord<IN> record)
                           throws Exception

Description copied from interface: Input

Set the correct key context before processing the record. Used for example to extract key from the record and pass that key to the state backends. This method is guaranteed to not be called concurrently with other methods of the operator.

Specified by:

setKeyContextElement in interface Input<IN>

Throws:

Exception