Package org.apache.flink.datastream.api.function

Interface TwoOutputStreamProcessFunction<IN,OUT1,OUT2>

All Superinterfaces:

org.apache.flink.api.common.functions.Function, ProcessFunction, Serializable

All Known Subinterfaces:

TwoOutputEventTimeStreamProcessFunction<IN,OUT1,OUT2>

@Experimental
public interface TwoOutputStreamProcessFunction<IN,OUT1,OUT2>
extends ProcessFunction

This contains all logical related to process and emit records to two output streams.

Method Summary

Modifier and Type	Method	Description
default void	endInput(TwoOutputNonPartitionedContext<OUT1,OUT2> ctx)	This is a life-cycle method indicates that this function will no longer receive any input data.
default void	onProcessingTimer(long timestamp, Collector<OUT1> output1, Collector<OUT2> output2, TwoOutputPartitionedContext<OUT1,OUT2> ctx)	Callback for processing timer.
default org.apache.flink.api.common.watermark.WatermarkHandlingResult	onWatermark(org.apache.flink.api.common.watermark.Watermark watermark, Collector<OUT1> output1, Collector<OUT2> output2, TwoOutputNonPartitionedContext<OUT1,OUT2> ctx)	Callback function when receive the watermark from the input.
default void	open(TwoOutputNonPartitionedContext<OUT1,OUT2> ctx)	Initialization method for the function.
void	processRecord(IN record, Collector<OUT1> output1, Collector<OUT2> output2, TwoOutputPartitionedContext<OUT1,OUT2> ctx)	Process and emit record to the first/second output through Collectors.

Methods inherited from interface org.apache.flink.datastream.api.function.ProcessFunction

close, declareWatermarks, usesStates

Method Detail

open

default void open(TwoOutputNonPartitionedContext<OUT1,OUT2> ctx)
           throws Exception

Initialization method for the function. It is called before the actual working methods (like processRecord) and thus suitable for one time setup work.

By default, this method does nothing.

Throws:

Exception - Implementations may forward exceptions, which are caught by the runtime. When the runtime catches an exception, it aborts the task and lets the fail-over logic decide whether to retry the task execution.

processRecord

void processRecord(IN record,
                   Collector<OUT1> output1,
                   Collector<OUT2> output2,
                   TwoOutputPartitionedContext<OUT1,OUT2> ctx)
            throws Exception

Process and emit record to the first/second output through Collectors.

Parameters:

record - to process.

output1 - to emit processed records to the first output.

output2 - to emit processed records to the second output.

ctx - runtime context in which this function is executed.

Throws:

Exception

endInput

default void endInput(TwoOutputNonPartitionedContext<OUT1,OUT2> ctx)
               throws Exception

This is a life-cycle method indicates that this function will no longer receive any input data.

Parameters:

ctx - the context in which this function is executed.

Throws:

Exception

onProcessingTimer

default void onProcessingTimer(long timestamp,
                               Collector<OUT1> output1,
                               Collector<OUT2> output2,
                               TwoOutputPartitionedContext<OUT1,OUT2> ctx)
                        throws Exception

Callback for processing timer.

Parameters:

timestamp - when this callback is triggered.

output1 - to emit record.

output2 - to emit record.

ctx - runtime context in which this function is executed.

Throws:

Exception

onWatermark

default org.apache.flink.api.common.watermark.WatermarkHandlingResult onWatermark(org.apache.flink.api.common.watermark.Watermark watermark,
                                                                                  Collector<OUT1> output1,
                                                                                  Collector<OUT2> output2,
                                                                                  TwoOutputNonPartitionedContext<OUT1,OUT2> ctx)
                                                                           throws Exception

Callback function when receive the watermark from the input.

Parameters:

watermark - to process.

output1 - to emit data to the first output.

output2 - to emit data to the second output.

ctx - runtime context in which this function is executed.

Throws:

Exception