Package se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.evolutionaryAlgorithm

Class TerminatedByNumberOfGenerations

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.evolutionaryAlgorithm.TerminationCriterionBase

se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.evolutionaryAlgorithm.TerminatedByNumberOfGenerations

All Implemented Interfaces:

TerminationCriterion

public class TerminatedByNumberOfGenerations
extends TerminationCriterionBase

termination criterion: number of generations

Field Summary

Fields

Modifier and Type	Field	Description
protected final int	generationThreshold

Fields inherited from class se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.evolutionaryAlgorithm.TerminationCriterionBase

nrGenerations

Constructor Summary

Constructors

Constructor	Description
TerminatedByNumberOfGenerations(int generationThreshold, LogicalPlan plan)

Method Summary

Modifier and Type	Method	Description
static TerminationCriterionFactory	getFactory(int generationThreshold)
boolean	readyToTerminate(Generation currentGeneration, List<Generation> previousGenerations)	Returns true if the generation number exceeds the threshold

Methods inherited from class se.liu.ida.hefquin.engine.queryproc.impl.poptimizer.evolutionaryAlgorithm.TerminationCriterionBase

calcFactorial, countNumOfOps

Methods inherited from class java.lang.Object

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

Field Details

generationThreshold

protected final int generationThreshold

Constructor Details

TerminatedByNumberOfGenerations

public TerminatedByNumberOfGenerations(int generationThreshold,
 LogicalPlan plan)

Method Details

getFactory

public static TerminationCriterionFactory getFactory(int generationThreshold)

readyToTerminate

public boolean readyToTerminate(Generation currentGeneration,
 List<Generation> previousGenerations)

Returns true if the generation number exceeds the threshold

Parameters:

currentGeneration - the current generation for which the termination criterion is test

previousGenerations - a list of all previous generations, in the order in which they have been created