Package net.bmahe.genetics4j.core.evolutionlisteners

Class EvolutionListenerLogTopN<T extends Comparable<T>>

java.lang.Object

net.bmahe.genetics4j.core.evolutionlisteners.EvolutionListenerLogTopN<T>

All Implemented Interfaces:

EvolutionListener<T>

public class EvolutionListenerLogTopN<T extends Comparable<T>>
extends Object
implements EvolutionListener<T>

Field Summary

Fields

Modifier and Type	Field	Description
private final Comparator<T>	comparator
private final org.apache.logging.log4j.Logger	logger
private Function<Genotype,String>	prettyPrinter
private final int	skipN
private final int	topN

Constructor Summary

Constructors

Constructor	Description
EvolutionListenerLogTopN(org.apache.logging.log4j.Logger _logger, int _topN, int _skipN)
EvolutionListenerLogTopN(org.apache.logging.log4j.Logger _logger, int _topN, int _skipN, Comparator<T> _comparator, Function<Genotype,String> _prettyPrinter)

Method Summary

Modifier and Type	Method	Description
void	onEvolution(long generation, List<Genotype> population, List<T> fitness, boolean isDone)	Called after each generation to notify about evolution progress.

Methods inherited from class java.lang.Object

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

Field Details

logger

private final org.apache.logging.log4j.Logger logger

topN

private final int topN

skipN

private final int skipN

comparator

private final Comparator<T extends Comparable<T>> comparator

prettyPrinter

private Function<Genotype,String> prettyPrinter

Constructor Details

EvolutionListenerLogTopN

public EvolutionListenerLogTopN(org.apache.logging.log4j.Logger _logger,
 int _topN,
 int _skipN,
 Comparator<T> _comparator,
 Function<Genotype,String> _prettyPrinter)

EvolutionListenerLogTopN

public EvolutionListenerLogTopN(org.apache.logging.log4j.Logger _logger,
 int _topN,
 int _skipN)

Method Details

onEvolution

public void onEvolution(long generation,
 List<Genotype> population,
 List<T> fitness,
 boolean isDone)

Description copied from interface: EvolutionListener

Called after each generation to notify about evolution progress.

This method is invoked by the evolutionary algorithm after each generation has been completed, providing access to the current population state and fitness values. The implementation can use this information for monitoring, logging, or adaptive control.

The method is called with:

• Current generation number (starting from 0)
• Complete population of genotypes for this generation
• Corresponding fitness values for each individual
• Flag indicating whether evolution has completed

Important notes:

• Population and fitness lists are guaranteed to have the same size
• Fitness values correspond to genotypes at the same index
• Data may be shared with the evolution algorithm; avoid modification
• Method should execute quickly to avoid impacting evolution performance

Specified by:

onEvolution in interface EvolutionListener<T extends Comparable<T>>

Parameters:

generation - the current generation number (0-based)

population - the list of genotypes in the current generation

fitness - the list of fitness values corresponding to each genotype

isDone - true if the evolution has completed, false otherwise