Package jsprit.examples

Source Code of jsprit.examples.SolomonExampleWithSpecifiedVehicleEndLocationsWithoutTWs

/*******************************************************************************
* Copyright (C) 2014  Stefan Schroeder
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3.0 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
package jsprit.examples;

import jsprit.analysis.toolbox.GraphStreamViewer;
import jsprit.analysis.toolbox.GraphStreamViewer.Label;
import jsprit.analysis.toolbox.Plotter;
import jsprit.core.algorithm.VehicleRoutingAlgorithm;
import jsprit.core.algorithm.io.VehicleRoutingAlgorithms;
import jsprit.core.algorithm.selector.SelectBest;
import jsprit.core.problem.VehicleRoutingProblem;
import jsprit.core.problem.io.VrpXMLReader;
import jsprit.core.problem.solution.VehicleRoutingProblemSolution;
import jsprit.core.reporting.SolutionPrinter;

import java.io.File;
import java.util.Collection;


public class SolomonExampleWithSpecifiedVehicleEndLocationsWithoutTWs {
 
  public static void main(String[] args) {
    /*
     * some preparation - create output folder
     */
    File dir = new File("output");
    // if the directory does not exist, create it
    if (!dir.exists()){
      System.out.println("creating directory ./output");
      boolean result = dir.mkdir()
      if(result) System.out.println("./output created")
    }
   
    /*
     * Build the problem.
     *
     * But define a problem-builder first.
     */
    VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
   
    /*
     * A solomonReader reads solomon-instance files, and stores the required information in the builder.
     */
    new VrpXMLReader(vrpBuilder).read("input/pickups_and_deliveries_solomon_c101_withoutTWs_and_specifiedVehicleEndLocations.xml");
   
    /*
     * Finally, the problem can be built. By default, transportCosts are crowFlyDistances (as usually used for vrp-instances).
     */
//    vrpBuilder.addProblemConstraint(Constraint.DELIVERIES_FIRST);
    VehicleRoutingProblem vrp = vrpBuilder.build();
   
    Plotter pblmPlotter = new Plotter(vrp);
    pblmPlotter.plot("output/solomon_C101_specifiedVehicleEndLocations_withoutTWs.png","C101");
   
    /*
     * Define the required vehicle-routing algorithms to solve the above problem.
     *
     * The algorithm can be defined and configured in an xml-file.
     */
//    VehicleRoutingAlgorithm vra = new SchrimpfFactory().createAlgorithm(vrp);
    VehicleRoutingAlgorithm vra = VehicleRoutingAlgorithms.readAndCreateAlgorithm(vrp, "input/algorithmConfigWithSchrimpfAcceptance.xml");
    vra.setMaxIterations(20000);
//    vra.setPrematureBreak(100);
//    vra.getAlgorithmListeners().addListener(new AlgorithmSearchProgressChartListener("output/sol_progress.png"));
    /*
     * Solve the problem.
     *
     *
     */
    Collection<VehicleRoutingProblemSolution> solutions = vra.searchSolutions();
   
    /*
     * Retrieve best solution.
     */
    VehicleRoutingProblemSolution solution = new SelectBest().selectSolution(solutions);
   
    /*
     * print solution
     */
    SolutionPrinter.print(solution);
   
    /*
     * Plot solution.
     */
//    SolutionPlotter.plotSolutionAsPNG(vrp, solution, "output/solomon_C101_specifiedVehicleEndLocations_solution.png","C101");
    Plotter solPlotter = new Plotter(vrp, solution);
    solPlotter.plot("output/solomon_C101_specifiedVehicleEndLocations_withoutTWs_solution.png","C101");
   
   
    new GraphStreamViewer(vrp, solution).setRenderDelay(50).labelWith(Label.ID).setEnableAutoLayout(true).display();
 
   
  }

}
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