eu.stratosphere.arraymodel.functions

Class CoGroupFunction

java.lang.Object

eu.stratosphere.api.common.functions.AbstractFunction

eu.stratosphere.arraymodel.functions.AbstractArrayModelFunction

eu.stratosphere.arraymodel.functions.CoGroupFunction

All Implemented Interfaces:

Function, GenericCoGrouper<Value[],Value[],Value[]>

public abstract class CoGroupFunction
extends AbstractArrayModelFunction
implements GenericCoGrouper<Value[],Value[],Value[]>

Constructor Summary

Constructors

Constructor and Description
CoGroupFunction()

Method Summary

Methods

Modifier and Type	Method and Description
abstract void	coGroup(Iterator<Value[]> records1, Iterator<Value[]> records2, Collector<Value[]> out) This method must be implemented to provide a user implementation of a matcher.
Method	getUDFMethod()

Methods inherited from class eu.stratosphere.arraymodel.functions.AbstractArrayModelFunction

getDataTypes

Methods inherited from class eu.stratosphere.api.common.functions.AbstractFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Methods inherited from interface eu.stratosphere.api.common.functions.GenericCoGrouper

combineFirst, combineSecond

Methods inherited from interface eu.stratosphere.api.common.functions.Function

close, getRuntimeContext, open, setRuntimeContext

Constructor Detail

CoGroupFunction

public CoGroupFunction()

Method Detail

coGroup

public abstract void coGroup(Iterator<Value[]> records1,
           Iterator<Value[]> records2,
           Collector<Value[]> out)

This method must be implemented to provide a user implementation of a matcher. It is called for each two key-value pairs that share the same key and come from different inputs.

Specified by:

coGroup in interface GenericCoGrouper<Value[],Value[],Value[]>

Parameters:

records1 - The records from the first input which were paired with the key.

records2 - The records from the second input which were paired with the key.

out - A collector that collects all output pairs.

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.

getUDFMethod

public Method getUDFMethod()

Specified by:

getUDFMethod in class AbstractArrayModelFunction