org.jgap

Class CachedFitnessFunction

java.lang.Object

org.jgap.FitnessFunction

org.jgap.CachedFitnessFunction

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ICloneable

public abstract class CachedFitnessFunction
extends FitnessFunction

The cached fitness function extends the original FitnessFunction functionality in order to reduce evaluating something twice.

Since:

3.2

See Also:

Serialized Form

Field Summary

Fields inherited from class org.jgap.FitnessFunction

DELTA, NO_FITNESS_VALUE

Constructor Summary

Constructors

Constructor and Description
CachedFitnessFunction() Default Constructor ensuring downward compatibility.
CachedFitnessFunction(java.util.Map<java.lang.String,java.lang.Double> cache) Constructor that allows to use a custom java.util.Map implementation as cache. E.g.

Method Summary

Modifier and Type	Method and Description
double	getFitnessValue(IChromosome a_subject) Cached fitness value function.

Methods inherited from class org.jgap.FitnessFunction

clone, getLastComputedFitnessValue

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedFitnessFunction

public CachedFitnessFunction()

Default Constructor ensuring downward compatibility.

Since:

3.3.2

CachedFitnessFunction

public CachedFitnessFunction(java.util.Map<java.lang.String,java.lang.Double> cache)

Constructor that allows to use a custom java.util.Map implementation as cache.
E.g. for multi-threaded fitness calculations one could use one instance of java.util.concurrent.ConcurrentHashMap for all instances of the fitness function.

Parameters:

cache - java.util.Map data structure used to cache the fitness values

Since:

3.3.2

Method Detail

getFitnessValue

public final double getFitnessValue(IChromosome a_subject)

Cached fitness value function.

Overrides:

getFitnessValue in class FitnessFunction

Parameters:

a_subject - the chromosome to evaluate

Returns:

fitness value, from cache if available

Since:

3.2