com.tinkerpop.gremlin.process.computer.util

Class StaticMapReduce<MK,MV,RK,RV,R>

java.lang.Object

com.tinkerpop.gremlin.process.computer.util.StaticMapReduce<MK,MV,RK,RV,R>

All Implemented Interfaces:

MapReduce<MK,MV,RK,RV,R>, java.lang.Cloneable

Direct Known Subclasses:

ClusterCountMapReduce, ClusterPopulationMapReduce, LambdaMapReduce, PageRankMapReduce, TraverserMapReduce

public abstract class StaticMapReduce<MK,MV,RK,RV,R>
extends java.lang.Object
implements MapReduce<MK,MV,RK,RV,R>

Author:

Marko A. Rodriguez (http://markorodriguez.com)

Nested Class Summary

Nested classes/interfaces inherited from interface com.tinkerpop.gremlin.process.computer.MapReduce

MapReduce.MapEmitter<K,V>, MapReduce.NullObject, MapReduce.ReduceEmitter<OK,OV>, MapReduce.Stage

Field Summary

Fields inherited from interface com.tinkerpop.gremlin.process.computer.MapReduce

MAP_REDUCE

Constructor Summary

Constructors

Constructor and Description
StaticMapReduce()

Method Summary

Modifier and Type	Method and Description
MapReduce<MK,MV,RK,RV,R>	clone() When multiple workers on a single machine need MapReduce instances, it is possible to use clone.
void	storeState(org.apache.commons.configuration.Configuration configuration) When it is necessary to store the state of a MapReduce job, this method is called.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.tinkerpop.gremlin.process.computer.MapReduce

addResultToMemory, combine, createMapReduce, doStage, generateFinalResult, getMapKeySort, getMemoryKey, getReduceKeySort, loadState, map, reduce

Constructor Detail

StaticMapReduce

public StaticMapReduce()

Method Detail

clone

public MapReduce<MK,MV,RK,RV,R> clone()
                               throws java.lang.CloneNotSupportedException

Description copied from interface: MapReduce

When multiple workers on a single machine need MapReduce instances, it is possible to use clone. This will provide a speedier way of generating instances, over the MapReduce.storeState(org.apache.commons.configuration.Configuration) and MapReduce.loadState(org.apache.commons.configuration.Configuration) model. The default implementation simply returns the object as it assumes that the MapReduce instance is a stateless singleton.

Specified by:

clone in interface MapReduce<MK,MV,RK,RV,R>

Overrides:

clone in class java.lang.Object

Returns:

A clone of the MapReduce object

Throws:

java.lang.CloneNotSupportedException

storeState

public void storeState(org.apache.commons.configuration.Configuration configuration)

Description copied from interface: MapReduce

When it is necessary to store the state of a MapReduce job, this method is called. This is typically required when the MapReduce job needs to be serialized to another machine. Note that what is stored is simply the instance state, not any processed data.

Specified by:

storeState in interface MapReduce<MK,MV,RK,RV,R>

Parameters:

configuration - the configuration to store the state of the MapReduce job in.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object