Type Parameters:

IN1 - The input type of the operator

IN2 - The input type of the operator

OUT - The output type of the operator

All Superinterfaces:

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

All Known Implementing Classes:

AsyncIntervalJoinOperator, AsyncKeyedCoProcessOperator, AsyncKeyedCoProcessOperatorWithWatermarkDelay, BatchCoBroadcastWithKeyedOperator, BatchCoBroadcastWithNonKeyedOperator, CoBroadcastWithKeyedOperator, CoBroadcastWithNonKeyedOperator, CoProcessOperator, CoStreamFlatMap, CoStreamMap, IntervalJoinOperator, KeyedCoProcessOperator, LegacyKeyedCoProcessOperator
```
@PublicEvolving
public interface TwoInputStreamOperator<IN1,IN2,OUT>
extends StreamOperator<OUT>
```
Interface for stream operators with two inputs. Use AbstractStreamOperator as a base class if you want to implement a custom operator.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`processElement1(StreamRecord<IN1> element)`	Processes one element that arrived on the first input of this two-input operator.
`void`	`processElement2(StreamRecord<IN2> element)`	Processes one element that arrived on the second input of this two-input operator.
`void`	`processLatencyMarker1(LatencyMarker latencyMarker)`	Processes a `LatencyMarker` that arrived on the first input of this two-input operator.
`void`	`processLatencyMarker2(LatencyMarker latencyMarker)`	Processes a `LatencyMarker` that arrived on the second input of this two-input operator.
`default void`	`processRecordAttributes1(RecordAttributes recordAttributes)`	Processes a `RecordAttributes` that arrived on the first input of this operator.
`default void`	`processRecordAttributes2(RecordAttributes recordAttributes)`	Processes a `RecordAttributes` that arrived on the second input of this operator.
`default void`	`processWatermark1(WatermarkEvent watermark)`	Processes a `Watermark` that arrived on the first input of this operator.
`void`	`processWatermark1(Watermark mark)`	Processes a `Watermark` that arrived on the first input of this two-input operator.
`default void`	`processWatermark2(WatermarkEvent watermark)`	Processes a `Watermark` that arrived on the second input of this operator.
`void`	`processWatermark2(Watermark mark)`	Processes a `Watermark` that arrived on the second input of this two-input operator.
`void`	`processWatermarkStatus1(WatermarkStatus watermarkStatus)`	Processes a `WatermarkStatus` that arrived on the first input of this two-input operator.
`void`	`processWatermarkStatus2(WatermarkStatus watermarkStatus)`	Processes a `WatermarkStatus` that arrived on the second input of this two-input operator.

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

- Method Detail
  - processElement1
```
void processElement1(StreamRecord<IN1> element)
              throws Exception
```
    Processes one element that arrived on the first input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
  - processElement2
```
void processElement2(StreamRecord<IN2> element)
              throws Exception
```
    Processes one element that arrived on the second input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
  - processWatermark1
```
void processWatermark1(Watermark mark)
                throws Exception
```
    Processes a Watermark that arrived on the first input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
    
    See Also:
    
    Watermark
  - processWatermark2
```
void processWatermark2(Watermark mark)
                throws Exception
```
    Processes a Watermark that arrived on the second input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
    
    See Also:
    
    Watermark
  - processLatencyMarker1
```
void processLatencyMarker1(LatencyMarker latencyMarker)
                    throws Exception
```
    Processes a LatencyMarker that arrived on the first input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
    
    See Also:
    
    LatencyMarker
  - processLatencyMarker2
```
void processLatencyMarker2(LatencyMarker latencyMarker)
                    throws Exception
```
    Processes a LatencyMarker that arrived on the second input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
    
    See Also:
    
    LatencyMarker
  - processWatermarkStatus1
```
void processWatermarkStatus1(WatermarkStatus watermarkStatus)
                      throws Exception
```
    Processes a WatermarkStatus that arrived on the first input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
    
    See Also:
    
    WatermarkStatus
  - processWatermarkStatus2
```
void processWatermarkStatus2(WatermarkStatus watermarkStatus)
                      throws Exception
```
    Processes a WatermarkStatus that arrived on the second input of this two-input operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
    
    See Also:
    
    WatermarkStatus
  - processRecordAttributes1
```
@Experimental
default void processRecordAttributes1(RecordAttributes recordAttributes)
                               throws Exception
```
    Processes a RecordAttributes that arrived on the first input of this operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
  - processRecordAttributes2
```
@Experimental
default void processRecordAttributes2(RecordAttributes recordAttributes)
                               throws Exception
```
    Processes a RecordAttributes that arrived on the second input of this operator. This method is guaranteed to not be called concurrently with other methods of the operator.
    
    Throws:
    
    Exception
  - processWatermark1
```
@Experimental
default void processWatermark1(WatermarkEvent watermark)
                        throws Exception
```
    Processes a Watermark that arrived on the first input of this operator.
    
    Throws:
    
    Exception
  - processWatermark2
```
@Experimental
default void processWatermark2(WatermarkEvent watermark)
                        throws Exception
```
    Processes a Watermark that arrived on the second input of this operator.
    
    Throws:
    
    Exception

Interface TwoInputStreamOperator<IN1,​IN2,​OUT>

Method Summary

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

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

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

Method Detail

processElement1

processElement2

processWatermark1

processWatermark2

processLatencyMarker1

processLatencyMarker2

processWatermarkStatus1

processWatermarkStatus2

processRecordAttributes1

processRecordAttributes2

processWatermark1

processWatermark2

Interface TwoInputStreamOperator<IN1,IN2,OUT>