Package org.apache.flink.api.common.functions

Class RichCoGroupFunction<IN1,IN2,OUT>

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichCoGroupFunction<IN1,IN2,OUT>

Type Parameters:

IN1 - The type of the elements in the first input.

IN2 - The type of the elements in the second input.

OUT - The type of the result elements.

All Implemented Interfaces:

Serializable, CoGroupFunction<IN1,IN2,OUT>, Function, RichFunction

@Public
public abstract class RichCoGroupFunction<IN1,IN2,OUT>
extends AbstractRichFunction
implements CoGroupFunction<IN1,IN2,OUT>

Rich variant of the CoGroupFunction. As a RichFunction, it gives access to the RuntimeContext and provides setup and teardown methods: RichFunction.open(OpenContext) and RichFunction.close().

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
RichCoGroupFunction()

Method Summary

Modifier and Type	Method	Description
abstract void	coGroup(Iterable<IN1> first, Iterable<IN2> second, Collector<OUT> out)	This method must be implemented to provide a user implementation of a coGroup.

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RichCoGroupFunction

public RichCoGroupFunction()

Method Detail

coGroup

public abstract void coGroup(Iterable<IN1> first,
                             Iterable<IN2> second,
                             Collector<OUT> out)
                      throws Exception

Description copied from interface: CoGroupFunction

This method must be implemented to provide a user implementation of a coGroup. It is called for each pair of element groups where the elements share the same key.

Specified by:

coGroup in interface CoGroupFunction<IN1,IN2,OUT>

Parameters:

first - The records from the first input.

second - The records from the second.

out - A collector to return elements.

Throws:

Exception - The function may throw Exceptions, which will cause the program to cancel, and may trigger the recovery logic.