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

Interface OneInputStreamProcessFunction<IN,OUT>

All Superinterfaces:

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

All Known Subinterfaces:

OneInputEventTimeStreamProcessFunction<IN,OUT>

@Experimental
public interface OneInputStreamProcessFunction<IN,OUT>
extends ProcessFunction

This contains all logical related to process records from single input.

Method Summary

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

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

close, declareWatermarks, usesStates

Method Details

open

default void open(NonPartitionedContext<OUT> 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<OUT> output,
 PartitionedContext<OUT> ctx)
            throws Exception

Process record and emit data through Collector.

Parameters:

record - to process.

output - to emit processed records.

ctx - runtime context in which this function is executed.

Throws:

Exception

endInput

default void endInput(NonPartitionedContext<OUT> ctx)
               throws Exception

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

Parameters:

ctx - the context in which this function is executed.

Throws:

Exception

onProcessingTimer

default void onProcessingTimer(long timestamp,
 Collector<OUT> output,
 PartitionedContext<OUT> ctx)
                        throws Exception

Callback for processing timer.

Parameters:

timestamp - when this callback is triggered.

output - 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<OUT> output,
 NonPartitionedContext<OUT> ctx)
                                                                           throws Exception

Callback function when receive watermark.

Throws:

Exception