ai.grakn.graql.internal.analytics

Class SumMapReduce

java.lang.Object

ai.grakn.graql.internal.analytics.CommonOLAP

ai.grakn.graql.internal.analytics.GraknMapReduce<T>

ai.grakn.graql.internal.analytics.StatisticsMapReduce<Number>

ai.grakn.graql.internal.analytics.SumMapReduce

All Implemented Interfaces:

Cloneable, org.apache.tinkerpop.gremlin.process.computer.MapReduce<Serializable,Number,Serializable,Number,Map<Serializable,Number>>

public class SumMapReduce
extends StatisticsMapReduce<Number>

The MapReduce program for computing the sum of the given resource.

Author:

Jason Liu, Sheldon Hall

Nested Class Summary

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

org.apache.tinkerpop.gremlin.process.computer.MapReduce.MapEmitter<K,V>, org.apache.tinkerpop.gremlin.process.computer.MapReduce.NullObject, org.apache.tinkerpop.gremlin.process.computer.MapReduce.ReduceEmitter<OK,OV>, org.apache.tinkerpop.gremlin.process.computer.MapReduce.Stage

Field Summary

Fields inherited from class ai.grakn.graql.internal.analytics.GraknMapReduce

RESERVED_TYPE_LABEL_KEY

Fields inherited from interface org.apache.tinkerpop.gremlin.process.computer.MapReduce

MAP_REDUCE

Constructor Summary

Constructors

Constructor and Description
SumMapReduce()
SumMapReduce(Set<LabelId> selectedLabelIds, AttributeType.DataType resourceDataType, String degreePropertyKey)

Method Summary

Modifier and Type	Method and Description
void	safeMap(org.apache.tinkerpop.gremlin.structure.Vertex vertex, org.apache.tinkerpop.gremlin.process.computer.MapReduce.MapEmitter<Serializable,Number> emitter) An alternative to the execute method when ghost vertices are an issue.

Methods inherited from class ai.grakn.graql.internal.analytics.StatisticsMapReduce

loadState

Methods inherited from class ai.grakn.graql.internal.analytics.GraknMapReduce

clone, combine, doStage, generateFinalResult, getMemoryKey, map, reduce, storeState

Methods inherited from class ai.grakn.graql.internal.analytics.CommonOLAP

toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.tinkerpop.gremlin.process.computer.MapReduce

addResultToMemory, createMapReduce, getMapKeySort, getReduceKeySort, workerEnd, workerStart

Constructor Detail

SumMapReduce

public SumMapReduce()

SumMapReduce

public SumMapReduce(Set<LabelId> selectedLabelIds,
                    AttributeType.DataType resourceDataType,
                    String degreePropertyKey)

Method Detail

safeMap

public void safeMap(org.apache.tinkerpop.gremlin.structure.Vertex vertex,
                    org.apache.tinkerpop.gremlin.process.computer.MapReduce.MapEmitter<Serializable,Number> emitter)

Description copied from class: GraknMapReduce

An alternative to the execute method when ghost vertices are an issue. Our "Ghostbuster".

Parameters:

vertex - a vertex that may be a ghost

emitter - Tinker emitter object