ai.grakn.graql.internal.analytics

Class CountMapReduce

java.lang.Object

ai.grakn.graql.internal.analytics.CommonOLAP

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

ai.grakn.graql.internal.analytics.CountMapReduce

All Implemented Interfaces:

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

public class CountMapReduce
extends GraknMapReduce<Long>

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

Modifier and Type	Field and Description
static String	MEMORY_KEY

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

MAP_REDUCE_MEMORY_KEY

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

analyticsElements

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

MAP_REDUCE

Constructor Summary

Constructors

Constructor and Description
CountMapReduce()
CountMapReduce(Set<String> types)

Method Summary

Modifier and Type	Method and Description
void	combine(Serializable key, Iterator<Long> values, org.apache.tinkerpop.gremlin.process.computer.MapReduce.ReduceEmitter<Serializable,Long> emitter)
boolean	doStage(org.apache.tinkerpop.gremlin.process.computer.MapReduce.Stage stage)
Map<Serializable,Long>	generateFinalResult(Iterator<org.apache.tinkerpop.gremlin.process.computer.KeyValue<Serializable,Long>> keyValues)
void	reduce(Serializable key, Iterator<Long> values, org.apache.tinkerpop.gremlin.process.computer.MapReduce.ReduceEmitter<Serializable,Long> emitter)
void	safeMap(org.apache.tinkerpop.gremlin.structure.Vertex vertex, org.apache.tinkerpop.gremlin.process.computer.MapReduce.MapEmitter<Serializable,Long> emitter) An alternative to the execute method when ghost vertices are an issue.

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

clone, getMemoryKey, map, storeState

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

loadState, 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, loadState, workerEnd, workerStart

Field Detail

MEMORY_KEY

public static final String MEMORY_KEY

See Also:

Constant Field Values

Constructor Detail

CountMapReduce

public CountMapReduce()

CountMapReduce

public CountMapReduce(Set<String> types)

Method Detail

doStage

public boolean doStage(org.apache.tinkerpop.gremlin.process.computer.MapReduce.Stage stage)

safeMap

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

combine

public void combine(Serializable key,
                    Iterator<Long> values,
                    org.apache.tinkerpop.gremlin.process.computer.MapReduce.ReduceEmitter<Serializable,Long> emitter)

reduce

public void reduce(Serializable key,
                   Iterator<Long> values,
                   org.apache.tinkerpop.gremlin.process.computer.MapReduce.ReduceEmitter<Serializable,Long> emitter)

generateFinalResult

public Map<Serializable,Long> generateFinalResult(Iterator<org.apache.tinkerpop.gremlin.process.computer.KeyValue<Serializable,Long>> keyValues)