org.moeaframework.algorithm
Class Checkpoints

java.lang.Object
  org.moeaframework.algorithm.PeriodicAction
      org.moeaframework.algorithm.Checkpoints

All Implemented Interfaces:

Algorithm

public class Checkpoints
extends PeriodicAction

Decorates an Algorithm to periodically save checkpoint files from which the algorithm can resume itself if unexpectedly terminated.

 File stateFile = new File("last.state");
 
 //if last.state exists, algorithm will be restored to last state
 Algorithm algorithm = new Checkpoints(new NSGAII(...), stateFile, 100);
 
 while (!algorithm.isTerminated()) {
   algorithm.step(); //periodically saves state to last.state
 }
 

Nested Class Summary

Nested classes/interfaces inherited from class org.moeaframework.algorithm.PeriodicAction

PeriodicAction.FrequencyType

Field Summary

Fields inherited from class org.moeaframework.algorithm.PeriodicAction

algorithm, frequency, frequencyType, iteration, lastInvocation

Constructor Summary

Checkpoints(Algorithm algorithm, File stateFile, int checkpointFrequency)
Decorates an algorithm to periodically save checkpoints from which the algorithm can resume itself if unexpectedly terminated.

Method Summary

void	doAction() Invoked periodically by this class to perform some function.

Methods inherited from class org.moeaframework.algorithm.PeriodicAction

evaluate, getNumberOfEvaluations, getProblem, getResult, getState, isTerminated, setState, step, terminate

Methods inherited from class java.lang.Object

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

Constructor Detail

Checkpoints

public Checkpoints(Algorithm algorithm,
                   File stateFile,
                   int checkpointFrequency)

Decorates an algorithm to periodically save checkpoints from which the algorithm can resume itself if unexpectedly terminated.

Parameters:

algorithm - the algorithm

stateFile - the file containing the checkpoint states

checkpointFrequency - the number of objective function evaluations between checkpoints

Method Detail

doAction

public void doAction()

Description copied from class: PeriodicAction

Invoked periodically by this class to perform some function. This function should not depend on the frequency that it is invoked, since it is not guaranteed that this method is invoked at any specific frequency and, in some cases, may not be invoked at all.

Specified by:

doAction in class PeriodicAction