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package org.uma.jmetal.runner.multiobjective;

import org.uma.jmetal.algorithm.Algorithm;
import org.uma.jmetal.algorithm.multiobjective.nsgaii.NSGAIIBuilder;
import org.uma.jmetal.algorithm.multiobjective.nsgaii.NSGAIIMeasures;
import org.uma.jmetal.measure.MeasureListener;
import org.uma.jmetal.measure.MeasureManager;
import org.uma.jmetal.measure.impl.BasicMeasure;
import org.uma.jmetal.measure.impl.CountingMeasure;
import org.uma.jmetal.measure.impl.DurationMeasure;
import org.uma.jmetal.operator.CrossoverOperator;
import org.uma.jmetal.operator.MutationOperator;
import org.uma.jmetal.operator.SelectionOperator;
import org.uma.jmetal.operator.impl.crossover.SBXCrossover;
import org.uma.jmetal.operator.impl.mutation.PolynomialMutation;
import org.uma.jmetal.operator.impl.selection.BinaryTournamentSelection;
import org.uma.jmetal.problem.Problem;
import org.uma.jmetal.solution.DoubleSolution;
import org.uma.jmetal.util.AbstractAlgorithmRunner;
import org.uma.jmetal.util.JMetalException;
import org.uma.jmetal.util.JMetalLogger;
import org.uma.jmetal.util.ProblemUtils;
import org.uma.jmetal.util.comparator.RankingAndCrowdingDistanceComparator;

import java.io.FileNotFoundException;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * Class to configure and run the NSGA-II algorithm (variant with measures)
 */
public class NSGAIIMeasuresRunner extends AbstractAlgorithmRunner {
  /**
   * @param args Command line arguments.
   * @throws SecurityException
   * Invoking command:
  java org.uma.jmetal.runner.multiobjective.NSGAIIMeasuresRunner problemName [referenceFront]
   */
  public static void main(String[] args)
      throws JMetalException, InterruptedException, FileNotFoundException {
    Problem problem;
    Algorithm> algorithm;
    CrossoverOperator crossover;
    MutationOperator mutation;
    SelectionOperator, DoubleSolution> selection;
    String referenceParetoFront = "" ;

    String problemName ;
    if (args.length == 1) {
      problemName = args[0];
    } else if (args.length == 2) {
      problemName = args[0] ;
      referenceParetoFront = args[1] ;
    } else {
      problemName = "org.uma.jmetal.problem.multiobjective.zdt.ZDT1";
      referenceParetoFront = "jmetal-problem/src/test/resources/pareto_fronts/ZDT1.pf" ;
    }

    problem = ProblemUtils. loadProblem(problemName);

    double crossoverProbability = 0.9 ;
    double crossoverDistributionIndex = 20.0 ;
    crossover = new SBXCrossover(crossoverProbability, crossoverDistributionIndex) ;

    double mutationProbability = 1.0 / problem.getNumberOfVariables() ;
    double mutationDistributionIndex = 20.0 ;
    mutation = new PolynomialMutation(mutationProbability, mutationDistributionIndex) ;

    selection = new BinaryTournamentSelection(
            new RankingAndCrowdingDistanceComparator());

    int maxEvaluations = 25000 ;
    int populationSize = 100 ;

    algorithm = new NSGAIIBuilder(problem, crossover, mutation)
        .setSelectionOperator(selection)
        .setMaxEvaluations(maxEvaluations)
        .setPopulationSize(populationSize)
        .setVariant(NSGAIIBuilder.NSGAIIVariant.Measures)
        .build() ;

    /* Measure management */
    MeasureManager measureManager = ((NSGAIIMeasures)algorithm).getMeasureManager() ;

    CountingMeasure currentEvalution =
        (CountingMeasure) measureManager.getPullMeasure("currentEvaluation");
    DurationMeasure currentComputingTime =
        (DurationMeasure) measureManager.getPullMeasure("currentExecutionTime");
    BasicMeasure nonDominatedSolutions =
        (BasicMeasure) measureManager.getPullMeasure("numberOfNonDominatedSolutionsInPopulation");

    BasicMeasure> solutionListMeasure =
        (BasicMeasure>) measureManager.> getPushMeasure("currentPopulation");
    CountingMeasure iteration2 =
        (CountingMeasure) measureManager.getPushMeasure("currentEvaluation");

    solutionListMeasure.register(new Listener());
    iteration2.register(new Listener2());
    /* End of measure management */

    Thread algorithmThread = new Thread(algorithm) ;
    algorithmThread.start();

    /* Using the measures */
    int i = 0 ;
    while(currentEvalution.get() < maxEvaluations) {
      TimeUnit.SECONDS.sleep(5);
      System.out.println("Evaluations (" + i + ")                     : " + currentEvalution.get()) ;
      System.out.println("Computing time (" + i + ")                  : " + currentComputingTime.get()) ;
      System.out.println("Number of Nondominated solutions (" + i + "): " + nonDominatedSolutions.get()) ;
      i++ ;
    }

    algorithmThread.join();

    List population = algorithm.getResult() ;
    long computingTime = currentComputingTime.get() ;

    JMetalLogger.logger.info("Total execution time: " + computingTime + "ms");

    printFinalSolutionSet(population);
    if (!referenceParetoFront.equals("")) {
      printQualityIndicators(population, referenceParetoFront) ;
    }

    System.exit(0) ;
  }

  private static class Listener implements MeasureListener> {
    private int counter = 0 ;

    @Override synchronized public void measureGenerated(List solutions) {
      if ((counter % 10 == 0)) {
        System.out.println("PUSH MEASURE. Counter = " + counter+ " First solution: " + solutions.get(0)) ;
      }
      counter ++ ;
    }
  }

  private static class Listener2 implements MeasureListener {
    @Override synchronized public void measureGenerated(Long value) {
      if ((value % 50 == 0)) {
        System.out.println("PUSH MEASURE. Iteration: " + value) ;
      }
    }
  }
}