Question

我遵循this example在Jsprit中设置MaxTimeInVehicleConstraint。但是，它在第106行的该文件MaxTimeInVehicleConstraint.java中返回空指针异常。据我观察，stateManager.getActivityState（）向minSlack返回空值。

这就是我设置问题的方式。

public class Test {

static int WHEELCHAIRSPACE_INDEX = 0;

static int PASSENGERSEATS_INDEX = 1;

private VehicleType vehicleType_wheelchair;

private VehicleType vehicleType_solelypassenger;

private VehicleImpl vehicle1,vehicle1_2,vehicle2,vehicle2_2;

private VehicleRoutingProblem.Builder vrpBuilder;

private HardRouteConstraint wheelchair_bus_passenger_pickup_constraint;

private VehicleRoutingAlgorithm algorithm;

private VehicleRoutingProblem problem;

private VehicleRoutingTransportCosts costMatrix;

private static final String FILENAME = "C:\\Users\\admin\\Desktop\\test.txt";

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Examples.createOutputFolder();
    Test test = new Test();
    test.createVehicleType();
    test.createVehicle();
    test.createJob();
    test.createConstraint();
    test.createProblem();
    test.searchSolution();
}

private void searchSolution() {
    Collection<VehicleRoutingProblemSolution> solutions = algorithm.searchSolutions();
    VehicleRoutingProblemSolution bestSolution = Solutions.bestOf(solutions);
    SolutionPrinter.print(problem, bestSolution, SolutionPrinter.Print.VERBOSE);
    for(VehicleRoutingProblemSolution solution:solutions) {
        System.out.println("*****************************************************************************************************************************************************************************************************");
        //SolutionPrinter.print(problem, solution, SolutionPrinter.Print.VERBOSE);
        System.out.println("*****************************************************************************************************************************************************************************************************");
    }

    Plotter problemPlotter = new Plotter(problem);
    problemPlotter.plotShipments(true);
    problemPlotter.setLabel(Plotter.Label.SIZE);
    problemPlotter.plot("output/transportOfDisabledPeopleExample_problem.png", "disabled people tp");

    Plotter solutionPlotter = new Plotter(problem, Solutions.bestOf(solutions));
    solutionPlotter.plotShipments(true);
    solutionPlotter.setLabel(Plotter.Label.SIZE);
    solutionPlotter.plot("output/transportOfDisabledPeopleExample_solution.png", "disabled people tp");


}

private void createProblem() {


    StateManager stateManager = new StateManager(problem);

    StateId id = stateManager.createStateId("max-time");
    StateId openJobsId = stateManager.createStateId("open-jobs-id");
    stateManager.addStateUpdater(new UpdateMaxTimeInVehicle(stateManager, id, problem.getTransportCosts(), problem.getActivityCosts(), openJobsId));

    ConstraintManager constraintManager = new ConstraintManager(problem, stateManager);
    constraintManager.addConstraint(wheelchair_bus_passenger_pickup_constraint);
    constraintManager.addConstraint(new MaxTimeInVehicleConstraint(problem.getTransportCosts(), problem.getActivityCosts(), id, stateManager, problem, openJobsId), ConstraintManager.Priority.CRITICAL);


    algorithm = Jsprit.Builder.newInstance(problem).setStateAndConstraintManager(stateManager,constraintManager).buildAlgorithm();
    algorithm.setPrematureAlgorithmTermination(new IterationWithoutImprovementTermination(100));
}

private void createConstraint() {
    wheelchair_bus_passenger_pickup_constraint = new HardRouteConstraint() {

        @Override
        public boolean fulfilled(JobInsertionContext insertionContext) {
            Object shipment2insert;
            Capacity capacity;
            try {
                shipment2insert = ((Shipment) insertionContext.getJob());
                capacity = ((Shipment) shipment2insert).getSize();
            }catch(Exception e) {
                shipment2insert = ((Service) insertionContext.getJob());
                capacity = ((Service) shipment2insert).getSize();
            }
            if (insertionContext.getNewVehicle().getId().equals("wheelchair_bus")) {
                if (capacity.get(PASSENGERSEATS_INDEX) > 2) {

                    return false;
                }
            }
            return true;
        }
    };
}

private void createJob() {
    com.graphhopper.jsprit.core.problem.job.Shipment.Builder builder1 = Shipment.Builder.newInstance("1");
    builder1.addSizeDimension(PASSENGERSEATS_INDEX, 1);
    builder1.setPickupLocation(Location.newInstance("1a"));
    builder1.setDeliveryLocation(Location.newInstance("1b"));
    builder1.setDeliveryServiceTime(0);
    builder1.setMaxTimeInVehicle(10);
    builder1.setPickupTimeWindow(new TimeWindow(0,2));
    builder1.setDeliveryTimeWindow(new TimeWindow(4,5));
    Shipment shipment1 = builder1.build();

    com.graphhopper.jsprit.core.problem.job.Shipment.Builder builder2 = Shipment.Builder.newInstance("2");
    builder2.addSizeDimension(PASSENGERSEATS_INDEX, 2);
    builder2.setPickupLocation(Location.newInstance("2a"));
    builder2.setDeliveryLocation(Location.newInstance("2b"));
    builder2.setDeliveryServiceTime(1);

    builder2.addRequiredSkill("first");
    builder2.setMaxTimeInVehicle(10);

    Shipment shipment2 = builder2.build();

    com.graphhopper.jsprit.core.problem.job.Shipment.Builder builder3 = Shipment.Builder.newInstance("3");
    builder3.addSizeDimension(PASSENGERSEATS_INDEX, 1);
    builder3.setPickupLocation(Location.newInstance("3a"));
    builder3.setDeliveryLocation(Location.newInstance("3b"));
    builder3.setDeliveryServiceTime(0);
    builder3.setMaxTimeInVehicle(10);
    builder3.setPickupTimeWindow(new TimeWindow(0,7));
    builder3.setDeliveryTimeWindow(new TimeWindow(8,10));
    Shipment shipment3 = builder3.build();

    com.graphhopper.jsprit.core.problem.job.Shipment.Builder builder4 = Shipment.Builder.newInstance("4");
    builder4.addSizeDimension(PASSENGERSEATS_INDEX, 1);
    builder4.setPickupLocation(Location.newInstance("4a"));
    builder4.setDeliveryLocation(Location.newInstance("4b"));
    builder4.setDeliveryServiceTime(1);
    builder4.setMaxTimeInVehicle(10);

    Shipment shipment4 = builder4.build();

    com.graphhopper.jsprit.core.problem.job.Shipment.Builder builder5 = Shipment.Builder.newInstance("5");
    builder5.addSizeDimension(PASSENGERSEATS_INDEX, 1);
    builder5.setPickupLocation(Location.newInstance("5a"));
    builder5.setDeliveryLocation(Location.newInstance("5b"));
    builder5.setDeliveryServiceTime(0);
    builder5.setMaxTimeInVehicle(10);

    Shipment shipment5 = builder5.build();

    setTransportCost();

    vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
    vrpBuilder.addVehicle(vehicle1);
    vrpBuilder.addVehicle(vehicle2);
    vrpBuilder.addVehicle(vehicle1_2);
    vrpBuilder.addVehicle(vehicle2_2);
    vrpBuilder.addJob(shipment1).addJob(shipment2).addJob(shipment3).addJob(shipment4);
    vrpBuilder.addJob(shipment5);


    vrpBuilder.setFleetSize(FleetSize.FINITE);
    vrpBuilder.setRoutingCost(costMatrix);
    problem = vrpBuilder.build();

}

private void setTransportCost() {
    // TODO Auto-generated method stub
    VehicleRoutingTransportCostsMatrix.Builder costMatrixBuilder = VehicleRoutingTransportCostsMatrix.Builder.newInstance(true);

    costMatrixBuilder.addTransportTime("0", "0", 0.0);
    costMatrixBuilder.addTransportTime("0", "1a", 2.0);
    costMatrixBuilder.addTransportTime("0", "1b", 3.3);
    costMatrixBuilder.addTransportTime("0", "2a", 2.0);
    costMatrixBuilder.addTransportTime("0", "2b", 4.3);
    costMatrixBuilder.addTransportTime("0", "3a", 3.5);
    costMatrixBuilder.addTransportTime("0", "3b", 3.0);
    costMatrixBuilder.addTransportTime("0", "4a", 1.5);
    costMatrixBuilder.addTransportTime("0", "4b", 2.7);
    costMatrixBuilder.addTransportTime("0", "5a", 1.2);
    costMatrixBuilder.addTransportTime("0", "5b", 3.5);

    costMatrixBuilder.addTransportTime("1a", "0", 2.0);
    costMatrixBuilder.addTransportTime("1a", "1a", 0.0);
    costMatrixBuilder.addTransportTime("1a", "1b", 2.5);
    costMatrixBuilder.addTransportTime("1a", "2a", 2.3);
    costMatrixBuilder.addTransportTime("1a", "2b", 4.4);
    costMatrixBuilder.addTransportTime("1a", "3a", 4.0);
    costMatrixBuilder.addTransportTime("1a", "3b", 4.0);
    costMatrixBuilder.addTransportTime("1a", "4a", 2.3);
    costMatrixBuilder.addTransportTime("1a", "4b", 4.5);
    costMatrixBuilder.addTransportTime("1a", "5a", 3.2);
    costMatrixBuilder.addTransportTime("1a", "5b", 1.5);

    costMatrixBuilder.addTransportTime("1b", "0", 3.3);
    costMatrixBuilder.addTransportTime("1b", "1a", 2.5);
    costMatrixBuilder.addTransportTime("1b", "1b", 0.0);
    costMatrixBuilder.addTransportTime("1b", "2a", 1.7);
    costMatrixBuilder.addTransportTime("1b", "2b", 2.2);
    costMatrixBuilder.addTransportTime("1b", "3a", 2.5);
    costMatrixBuilder.addTransportTime("1b", "3b", 3.4);
    costMatrixBuilder.addTransportTime("1b", "4a", 4.5);
    costMatrixBuilder.addTransportTime("1b", "4b", 5.0);
    costMatrixBuilder.addTransportTime("1b", "5a", 4.5);
    costMatrixBuilder.addTransportTime("1b", "5b", 2.2);

    costMatrixBuilder.addTransportTime("2a", "0", 2.0);
    costMatrixBuilder.addTransportTime("2a", "1a", 2.3);
    costMatrixBuilder.addTransportTime("2a", "1b", 1.7);
    costMatrixBuilder.addTransportTime("2a", "2a", 0.0);
    costMatrixBuilder.addTransportTime("2a", "2b", 2.3);
    costMatrixBuilder.addTransportTime("2a", "3a", 1.7);
    costMatrixBuilder.addTransportTime("2a", "3b", 1.8);
    costMatrixBuilder.addTransportTime("2a", "4a", 3.3);
    costMatrixBuilder.addTransportTime("2a", "4b", 3.2);
    costMatrixBuilder.addTransportTime("2a", "5a", 3.0);
    costMatrixBuilder.addTransportTime("2a", "5b", 2.9);

    costMatrixBuilder.addTransportTime("2b", "0", 4.3);
    costMatrixBuilder.addTransportTime("2b", "1a", 4.4);
    costMatrixBuilder.addTransportTime("2b", "1b", 2.2);
    costMatrixBuilder.addTransportTime("2b", "2a", 2.3);
    costMatrixBuilder.addTransportTime("2b", "2b", 0.0);
    costMatrixBuilder.addTransportTime("2b", "3a", 1.2);
    costMatrixBuilder.addTransportTime("2b", "3b", 2.8);
    costMatrixBuilder.addTransportTime("2b", "4a", 5.7);
    costMatrixBuilder.addTransportTime("2b", "4b", 4.5);
    costMatrixBuilder.addTransportTime("2b", "5a", 5.2);
    costMatrixBuilder.addTransportTime("2b", "5b", 4.3);

    costMatrixBuilder.addTransportTime("3a", "0", 3.5);
    costMatrixBuilder.addTransportTime("3a", "1a", 4.0);
    costMatrixBuilder.addTransportTime("3a", "1b", 2.5);
    costMatrixBuilder.addTransportTime("3a", "2a", 1.7);
    costMatrixBuilder.addTransportTime("3a", "2b", 1.2);
    costMatrixBuilder.addTransportTime("3a", "3a", 0.0);
    costMatrixBuilder.addTransportTime("3a", "3b", 1.5);
    costMatrixBuilder.addTransportTime("3a", "4a", 5.0);
    costMatrixBuilder.addTransportTime("3a", "4b", 3.3);
    costMatrixBuilder.addTransportTime("3a", "5a", 4.2);
    costMatrixBuilder.addTransportTime("3a", "5b", 4.3);

    costMatrixBuilder.addTransportTime("3b", "0", 3.0);
    costMatrixBuilder.addTransportTime("3b", "1a", 4.0);
    costMatrixBuilder.addTransportTime("3b", "1b", 3.4);
    costMatrixBuilder.addTransportTime("3b", "2a", 1.8);
    costMatrixBuilder.addTransportTime("3b", "2b", 2.8);
    costMatrixBuilder.addTransportTime("3b", "3a", 1.5);
    costMatrixBuilder.addTransportTime("3b", "3b", 0.0);
    costMatrixBuilder.addTransportTime("3b", "4a", 4.3);
    costMatrixBuilder.addTransportTime("3b", "4b", 1.8);
    costMatrixBuilder.addTransportTime("3b", "5a", 2.8);
    costMatrixBuilder.addTransportTime("3b", "5b", 5.0);

    costMatrixBuilder.addTransportTime("4a", "0", 1.5);
    costMatrixBuilder.addTransportTime("4a", "1a", 2.3);
    costMatrixBuilder.addTransportTime("4a", "1b", 4.5);
    costMatrixBuilder.addTransportTime("4a", "2a", 3.3);
    costMatrixBuilder.addTransportTime("4a", "2b", 5.7);
    costMatrixBuilder.addTransportTime("4a", "3a", 5.0);
    costMatrixBuilder.addTransportTime("4a", "3b", 4.3);
    costMatrixBuilder.addTransportTime("4a", "4a", 0.0);
    costMatrixBuilder.addTransportTime("4a", "4b", 3.6);
    costMatrixBuilder.addTransportTime("4a", "5a", 1.7);
    costMatrixBuilder.addTransportTime("4a", "5b", 3.8);

    costMatrixBuilder.addTransportTime("4b", "0", 2.7);
    costMatrixBuilder.addTransportTime("4b", "1a", 4.5);
    costMatrixBuilder.addTransportTime("4b", "1b", 5.0);
    costMatrixBuilder.addTransportTime("4b", "2a", 3.2);
    costMatrixBuilder.addTransportTime("4b", "2b", 4.5);
    costMatrixBuilder.addTransportTime("4b", "3a", 3.3);
    costMatrixBuilder.addTransportTime("4b", "3b", 1.8);
    costMatrixBuilder.addTransportTime("4b", "4a", 3.6);
    costMatrixBuilder.addTransportTime("4b", "4b", 0.0);
    costMatrixBuilder.addTransportTime("4b", "5a", 1.9);
    costMatrixBuilder.addTransportTime("4b", "5b", 5.7);

    costMatrixBuilder.addTransportTime("5a", "0", 1.2);
    costMatrixBuilder.addTransportTime("5a", "1a", 3.2);
    costMatrixBuilder.addTransportTime("5a", "1b", 4.5);
    costMatrixBuilder.addTransportTime("5a", "2a", 3.0);
    costMatrixBuilder.addTransportTime("5a", "2b", 5.2);
    costMatrixBuilder.addTransportTime("5a", "3a", 4.2);
    costMatrixBuilder.addTransportTime("5a", "3b", 2.8);
    costMatrixBuilder.addTransportTime("5a", "4a", 1.7);
    costMatrixBuilder.addTransportTime("5a", "4b", 1.9);
    costMatrixBuilder.addTransportTime("5a", "5a", 0.0);
    costMatrixBuilder.addTransportTime("5a", "5b", 4.7);

    costMatrixBuilder.addTransportTime("5b", "0", 3.5);
    costMatrixBuilder.addTransportTime("5b", "1a", 1.5);
    costMatrixBuilder.addTransportTime("5b", "1b", 2.2);
    costMatrixBuilder.addTransportTime("5b", "2a", 2.9);
    costMatrixBuilder.addTransportTime("5b", "2b", 4.3);
    costMatrixBuilder.addTransportTime("5b", "3a", 4.3);
    costMatrixBuilder.addTransportTime("5b", "3b", 5.0);
    costMatrixBuilder.addTransportTime("5b", "4a", 3.8);
    costMatrixBuilder.addTransportTime("5b", "4b", 5.7);
    costMatrixBuilder.addTransportTime("5b", "5a", 4.7);
    costMatrixBuilder.addTransportTime("5b", "5b", 0.0);

    costMatrix = costMatrixBuilder.build();
}

private void createVehicle() {
    Builder vehicleBuilder1 = VehicleImpl.Builder.newInstance("wheelchair_bus");
    vehicleBuilder1.setStartLocation(Location.newInstance("0")).setEndLocation(Location.newInstance("0"));
    vehicleBuilder1.setType(vehicleType_wheelchair);
    vehicleBuilder1.setEarliestStart(0);
    vehicleBuilder1.setLatestArrival(100);
    Break myFirstBreak = Break.Builder.newInstance("myFirstBreak")
            .setTimeWindow(TimeWindow.newInstance(5, 7)).setServiceTime(3).build();
    vehicleBuilder1.setBreak(myFirstBreak);
    vehicleBuilder1.addSkill("first");
    vehicle1 = vehicleBuilder1.build();

    Builder vehicleBuilder1_2 = VehicleImpl.Builder.newInstance("wheelchair_bus_2");
    vehicleBuilder1_2.setStartLocation(Location.newInstance("0")).setEndLocation(Location.newInstance("0"));
    vehicleBuilder1_2.setType(vehicleType_wheelchair);
    vehicleBuilder1_2.setEarliestStart(0);
    vehicleBuilder1_2.setLatestArrival(20);
    vehicle1_2 = vehicleBuilder1_2.build();

    Builder vehicleBuilder2 = VehicleImpl.Builder.newInstance("passenger_bus");
    vehicleBuilder2.setStartLocation(Location.newInstance("0")).setEndLocation(Location.newInstance("0"));
    vehicleBuilder2.setType(vehicleType_solelypassenger);
    vehicleBuilder2.setEarliestStart(0);
    vehicleBuilder2.setLatestArrival(20);
    vehicleBuilder2.addSkill("second");
    vehicle2 = vehicleBuilder2.build();

    Builder vehicleBuilder2_2 = VehicleImpl.Builder.newInstance("passenger_bus_2");
    vehicleBuilder2_2.setStartLocation(Location.newInstance("0")).setEndLocation(Location.newInstance("0"));
    vehicleBuilder2_2.setType(vehicleType_solelypassenger);
    vehicleBuilder2_2.setEarliestStart(0);
    vehicleBuilder2_2.setLatestArrival(20);
    vehicleBuilder2_2.addSkill("third");
    vehicle2_2 = vehicleBuilder2_2.build();
}

private void createVehicleType() {
    VehicleTypeImpl.Builder wheelChairTypeBuilder = VehicleTypeImpl.Builder.newInstance("wheelChairBusType");
    //wheelChairTypeBuilder.addCapacityDimension(WHEELCHAIRSPACE_INDEX, 2);
    wheelChairTypeBuilder.addCapacityDimension(PASSENGERSEATS_INDEX, 5);
    //wheelChairTypeBuilder.setCostPerDistance(1);
    wheelChairTypeBuilder.setCostPerTransportTime(2);
    wheelChairTypeBuilder.setFixedCost(0);
    vehicleType_wheelchair = wheelChairTypeBuilder.build();

    VehicleTypeImpl.Builder soleyPassengerTypeBuilder = VehicleTypeImpl.Builder.newInstance("passengerBusType");
    soleyPassengerTypeBuilder.addCapacityDimension(PASSENGERSEATS_INDEX, 6);
    //soleyPassengerTypeBuilder.setCostPerDistance(1);
    soleyPassengerTypeBuilder.setCostPerTransportTime(2);
    soleyPassengerTypeBuilder.setFixedCost(0);
    vehicleType_solelypassenger = soleyPassengerTypeBuilder.build();
}

private static Location loc(Coordinate coordinate) {
    return Location.Builder.newInstance().setCoordinate(coordinate).build();
}
}

这是我运行问题后的错误。

当它捕获到空指针异常时，我尝试为minSlack分配默认值。然后，Jsprit完全运行。但是，我不确定此方法是否正确。

这就是我在第106行中编辑MaxTimeInVehicleConstraint.java的方式

double minSlack = Double.MAX_VALUE;
    try{
        if (!(nextAct instanceof End)) {
            minSlack = stateManager.getActivityState(nextAct, iFacts.getNewVehicle(), minSlackId, Double.class);
        }
    }catch(Exception e) {
    }

这是Jspirt的错误吗？我的解决方案正确吗？有没有更好的解决方案来解决这个问题？

如何在Jsprit中使用MaxTimeInVehicleConstraint

0 个答案: