org.apache.flink.streaming.api.functions.co

Interface CoMapFunction<IN1,IN2,OUT>

Type Parameters:

IN1 - Type of the first input.

IN2 - Type of the second input.

OUT - Output type.

All Superinterfaces:

Function, Serializable

All Known Implementing Classes:

IncrementalLearningSkeleton.Predictor, RichCoMapFunction

@Public
public interface CoMapFunction<IN1,IN2,OUT>
extends Function, Serializable

A CoFlatMapFunction implements a map() transformation over two connected streams.

The same instance of the transformation function is used to transform both of the connected streams. That way, the stream transformations can share state.

Method Summary

Modifier and Type	Method and Description
OUT	map1(IN1 value) This method is called for each element in the first of the connected streams.
OUT	map2(IN2 value) This method is called for each element in the second of the connected streams.

Method Detail

map1

OUT map1(IN1 value)
  throws Exception

This method is called for each element in the first of the connected streams.

Parameters:

value - The stream element

Returns:

The resulting element

Throws:

Exception - The function may throw exceptions which cause the streaming program to fail and go into recovery.

map2

OUT map2(IN2 value)
  throws Exception

This method is called for each element in the second of the connected streams.

Parameters:

value - The stream element

Returns:

The resulting element

Throws:

Exception - The function may throw exceptions which cause the streaming program to fail and go into recovery.