Java tutorial
/* * Licensed to GraphHopper GmbH under one or more contributor * license agreements. See the NOTICE file distributed with this work for * additional information regarding copyright ownership. * * GraphHopper GmbH licenses this file to you under the Apache License, * Version 2.0 (the "License"); you may not use this file except in * compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.graphhopper.jsprit.examples; import com.graphhopper.jsprit.analysis.toolbox.Plotter; import com.graphhopper.jsprit.core.algorithm.VehicleRoutingAlgorithm; import com.graphhopper.jsprit.core.problem.Location; import com.graphhopper.jsprit.core.problem.VehicleRoutingProblem; import com.graphhopper.jsprit.core.problem.job.Service; import com.graphhopper.jsprit.core.problem.solution.VehicleRoutingProblemSolution; import com.graphhopper.jsprit.core.problem.vehicle.VehicleImpl; import com.graphhopper.jsprit.core.problem.vehicle.VehicleImpl.Builder; import com.graphhopper.jsprit.core.problem.vehicle.VehicleType; import com.graphhopper.jsprit.core.problem.vehicle.VehicleTypeImpl; import com.graphhopper.jsprit.core.reporting.SolutionPrinter; import com.graphhopper.jsprit.core.util.Solutions; import com.graphhopper.jsprit.io.algorithm.AlgorithmConfig; import com.graphhopper.jsprit.io.algorithm.VehicleRoutingAlgorithms; import com.graphhopper.jsprit.io.problem.VrpXMLWriter; import com.graphhopper.jsprit.util.Examples; import org.apache.commons.configuration.XMLConfiguration; import java.util.Collection; public class ConfigureAlgorithmInCodeInsteadOfPerXml { public static void main(String[] args) { /* * some preparation - create output folder */ Examples.createOutputFolder(); /* * get a vehicle type-builder and build a type with the typeId "vehicleType" and a capacity of 2 */ VehicleTypeImpl.Builder vehicleTypeBuilder = VehicleTypeImpl.Builder.newInstance("vehicleType") .addCapacityDimension(0, 2); VehicleType vehicleType = vehicleTypeBuilder.build(); /* * get a vehicle-builder and build a vehicle located at (10,10) with type "vehicleType" */ Builder vehicleBuilder = VehicleImpl.Builder.newInstance("vehicle"); vehicleBuilder.setStartLocation(Location.newInstance(10, 10)); vehicleBuilder.setType(vehicleType); VehicleImpl vehicle = vehicleBuilder.build(); /* * build services at the required locations, each with a capacity-demand of 1. */ Service service1 = Service.Builder.newInstance("1").addSizeDimension(0, 1) .setLocation(Location.newInstance(5, 7)).build(); Service service2 = Service.Builder.newInstance("2").addSizeDimension(0, 1) .setLocation(Location.newInstance(5, 13)).build(); Service service3 = Service.Builder.newInstance("3").addSizeDimension(0, 1) .setLocation(Location.newInstance(15, 7)).build(); Service service4 = Service.Builder.newInstance("4").addSizeDimension(0, 1) .setLocation(Location.newInstance(15, 13)).build(); VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance(); vrpBuilder.addVehicle(vehicle); vrpBuilder.addJob(service1).addJob(service2).addJob(service3).addJob(service4); VehicleRoutingProblem problem = vrpBuilder.build(); /* * get the algorithm out-of-the-box. */ AlgorithmConfig algorithmConfig = getAlgorithmConfig(); VehicleRoutingAlgorithm algorithm = VehicleRoutingAlgorithms.createAlgorithm(problem, algorithmConfig); /* * and search a solution */ Collection<VehicleRoutingProblemSolution> solutions = algorithm.searchSolutions(); /* * get the best */ VehicleRoutingProblemSolution bestSolution = Solutions.bestOf(solutions); new VrpXMLWriter(problem, solutions).write("output/problem-with-solution.xml"); SolutionPrinter.print(bestSolution); /* * plot */ new Plotter(problem, bestSolution).plot("output/solution.png", "solution"); } private static AlgorithmConfig getAlgorithmConfig() { AlgorithmConfig config = new AlgorithmConfig(); XMLConfiguration xmlConfig = config.getXMLConfiguration(); xmlConfig.setProperty("iterations", "2000"); xmlConfig.setProperty("construction.insertion[@name]", "bestInsertion"); xmlConfig.setProperty("strategy.memory", 1); String searchStrategy = "strategy.searchStrategies.searchStrategy"; xmlConfig.setProperty(searchStrategy + "(0)[@name]", "random_best"); xmlConfig.setProperty(searchStrategy + "(0).selector[@name]", "selectBest"); xmlConfig.setProperty(searchStrategy + "(0).acceptor[@name]", "acceptNewRemoveWorst"); xmlConfig.setProperty(searchStrategy + "(0).modules.module(0)[@name]", "ruin_and_recreate"); xmlConfig.setProperty(searchStrategy + "(0).modules.module(0).ruin[@name]", "randomRuin"); xmlConfig.setProperty(searchStrategy + "(0).modules.module(0).ruin.share", "0.3"); xmlConfig.setProperty(searchStrategy + "(0).modules.module(0).insertion[@name]", "bestInsertion"); xmlConfig.setProperty(searchStrategy + "(0).probability", "0.5"); xmlConfig.setProperty(searchStrategy + "(1)[@name]", "radial_best"); xmlConfig.setProperty(searchStrategy + "(1).selector[@name]", "selectBest"); xmlConfig.setProperty(searchStrategy + "(1).acceptor[@name]", "acceptNewRemoveWorst"); xmlConfig.setProperty(searchStrategy + "(1).modules.module(0)[@name]", "ruin_and_recreate"); xmlConfig.setProperty(searchStrategy + "(1).modules.module(0).ruin[@name]", "radialRuin"); xmlConfig.setProperty(searchStrategy + "(1).modules.module(0).ruin.share", "0.15"); xmlConfig.setProperty(searchStrategy + "(1).modules.module(0).insertion[@name]", "bestInsertion"); xmlConfig.setProperty(searchStrategy + "(1).probability", "0.5"); return config; } }