mirror of
https://github.com/graphhopper/jsprit.git
synced 2020-01-24 07:45:05 +01:00
17 KiB
17 KiB
This example covers:
- defining and creating different 'depots', vehicles and their types
- defining a problem with finite fleet-size
- reading and creating an algorithm
- plotting the solution
It is based on the problem instance P01 defined by
Cordeau, J.-F., Gendreau, M. and Laporte, G. (1997), A tabu search heuristic for periodic and multi-depot vehicle routing problems. Networks, 30: 105–119.
Please visit for example this site to get more information on Multiple Depot VRP.
Before you start, add the latest release to your pom. Additionally, create an output folder in your project directory. Either do it manually or add the following lines to your code (even this obfuscates the code-example a bit):
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");
}
All services of P01 are stored in an xml-file called vrp_cordeau_01.xml (you can find it here). To read them into your problemBuilder, code the following lines:
VehicleRoutingProblem.Builder vrpBuilder = VehicleRoutingProblem.Builder.newInstance();
/*
* Read cordeau-instance p01, BUT only its services without any vehicles
*/
new VrpXMLReader(vrpBuilder).read("input/vrp_cordeau_01.xml");
Define and add depots, vehicles and their types as follows:
/*
* add vehicles with its depots
* 4 depots with the following coordinates:
* (20,20), (30,40), (50,30), (60,50)
*
* each with 4 vehicles each with a capacity of 80
*/
int nuOfVehicles = 4;
int capacity = 80;
Coordinate firstDepotCoord = Coordinate.newInstance(20, 20);
Coordinate second = Coordinate.newInstance(30, 40);
Coordinate third = Coordinate.newInstance(50, 30);
Coordinate fourth = Coordinate.newInstance(60, 50);
int depotCounter = 1;
for(Coordinate depotCoord : Arrays.asList(firstDepotCoord,second,third,fourth)){
for(int i=0;i<nuOfVehicles;i++){
String typeId = depotCounter + "_type";
VehicleType vehicleType = VehicleTypeImpl.Builder.newInstance(typeId).addCapacityDimension(0,capacity).setCostPerDistance(1.0).build();
String vehicleId = depotCounter + "_" + (i+1) + "_vehicle";
VehicleImpl.Builder vehicleBuilder = VehicleImpl.Builder.newInstance(vehicleId);
vehicleBuilder.setStartLocation(Location.newInstance(depotCoord.getX(),depotCoord.getY())); //defines the location of the vehicle and thus the depot
vehicleBuilder.setType(vehicleType)
VehicleImpl vehicle = vehicleBuilder.build();
vrpBuilder.addVehicle(vehicle);
}
depotCounter++;
}
Note that there is no explicit depot definition. Depots are defined by the location of vehicles.
Set finite fleet-size and build the problem.
/*
* define problem with finite fleet
*/
vrpBuilder.setFleetSize(FleetSize.FINITE);
/*
* build the problem
*/
VehicleRoutingProblem vrp = vrpBuilder.build();
Plot it, to see how it looks like.
Plotter plotter = new Plotter(vrp).plot("output/problem01.png", "p01");
It looks like this:
Define and run an algorithm to solve the problem.
/*
* solve the problem
*/
VehicleRoutingAlgorithm vra = Jsprit.createAlgorithm(vrp);
Collection solutions = vra.searchSolutions();
You can plot it by:
Plotter plotter = new Plotter(vrp,Solutions.bestOf(solutions));
plotter.plot("output/p01_solution.png", "p01");
and print the results to your console by:
SolutionPrinter.print(vrp,Solutions.bestOf(solutions),Print.VERBOSE);
+--------------------------+ | problem | +---------------+----------+ | indicator | value | +---------------+----------+ | nJobs | 50 | | nServices | 50 | | nShipments | 0 | | fleetsize | FINITE | +--------------------------+ +----------------------------------------------------------+ | solution | +---------------+------------------------------------------+ | indicator | value | +---------------+------------------------------------------+ | costs | 582.9805315622696 | | nVehicles | 11 | +----------------------------------------------------------+ +--------------------------------------------------------------------------------------------------------------------------------+ | detailed solution | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | route | vehicle | activity | job | arrTime | endTime | costs | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 1 | 3_1_vehicle | start | - | undef | 0 | 0 | | 1 | 3_1_vehicle | service | 9 | 4 | 4 | 4 | | 1 | 3_1_vehicle | service | 34 | 13 | 13 | 13 | | 1 | 3_1_vehicle | service | 30 | 19 | 19 | 19 | | 1 | 3_1_vehicle | service | 39 | 31 | 31 | 31 | | 1 | 3_1_vehicle | service | 10 | 41 | 41 | 41 | | 1 | 3_1_vehicle | end | - | 50 | undef | 50 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 2 | 2_2_vehicle | start | - | undef | 0 | 0 | | 2 | 2_2_vehicle | service | 11 | 12 | 12 | 12 | | 2 | 2_2_vehicle | service | 32 | 18 | 18 | 18 | | 2 | 2_2_vehicle | service | 1 | 25 | 25 | 25 | | 2 | 2_2_vehicle | service | 22 | 32 | 32 | 32 | | 2 | 2_2_vehicle | service | 28 | 42 | 42 | 42 | | 2 | 2_2_vehicle | service | 31 | 48 | 48 | 48 | | 2 | 2_2_vehicle | service | 26 | 58 | 58 | 58 | | 2 | 2_2_vehicle | end | - | 86 | undef | 86 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 3 | 2_4_vehicle | start | - | undef | 0 | 0 | | 3 | 2_4_vehicle | service | 46 | 2 | 2 | 2 | | 3 | 2_4_vehicle | service | 12 | 9 | 9 | 9 | | 3 | 2_4_vehicle | service | 47 | 15 | 15 | 15 | | 3 | 2_4_vehicle | end | - | 25 | undef | 25 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 4 | 2_1_vehicle | start | - | undef | 0 | 0 | | 4 | 2_1_vehicle | service | 23 | 22 | 22 | 22 | | 4 | 2_1_vehicle | service | 7 | 28 | 28 | 28 | | 4 | 2_1_vehicle | service | 43 | 40 | 40 | 40 | | 4 | 2_1_vehicle | service | 24 | 53 | 53 | 53 | | 4 | 2_1_vehicle | service | 14 | 63 | 63 | 63 | | 4 | 2_1_vehicle | end | - | 81 | undef | 81 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 5 | 4_2_vehicle | start | - | undef | 0 | 0 | | 5 | 4_2_vehicle | service | 20 | 9 | 9 | 9 | | 5 | 4_2_vehicle | service | 3 | 16 | 16 | 16 | | 5 | 4_2_vehicle | service | 36 | 28 | 28 | 28 | | 5 | 4_2_vehicle | service | 35 | 35 | 35 | 35 | | 5 | 4_2_vehicle | end | - | 48 | undef | 48 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 6 | 1_2_vehicle | start | - | undef | 0 | 0 | | 6 | 1_2_vehicle | service | 44 | 11 | 11 | 11 | | 6 | 1_2_vehicle | service | 45 | 21 | 21 | 21 | | 6 | 1_2_vehicle | service | 33 | 28 | 28 | 28 | | 6 | 1_2_vehicle | service | 15 | 40 | 40 | 40 | | 6 | 1_2_vehicle | service | 37 | 47 | 47 | 47 | | 6 | 1_2_vehicle | service | 17 | 52 | 52 | 52 | | 6 | 1_2_vehicle | end | - | 60 | undef | 60 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 7 | 3_2_vehicle | start | - | undef | 0 | 0 | | 7 | 3_2_vehicle | service | 49 | 3 | 3 | 3 | | 7 | 3_2_vehicle | service | 5 | 11 | 11 | 11 | | 7 | 3_2_vehicle | service | 38 | 18 | 18 | 18 | | 7 | 3_2_vehicle | end | - | 25 | undef | 25 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 8 | 1_3_vehicle | start | - | undef | 0 | 0 | | 8 | 1_3_vehicle | service | 25 | 22 | 22 | 22 | | 8 | 1_3_vehicle | service | 18 | 33 | 33 | 33 | | 8 | 1_3_vehicle | service | 4 | 41 | 41 | 41 | | 8 | 1_3_vehicle | end | - | 47 | undef | 47 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 9 | 2_3_vehicle | start | - | undef | 0 | 0 | | 9 | 2_3_vehicle | service | 6 | 11 | 11 | 11 | | 9 | 2_3_vehicle | service | 48 | 20 | 20 | 20 | | 9 | 2_3_vehicle | service | 8 | 30 | 30 | 30 | | 9 | 2_3_vehicle | service | 27 | 44 | 44 | 44 | | 9 | 2_3_vehicle | end | - | 52 | undef | 52 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 10 | 4_3_vehicle | start | - | undef | 0 | 0 | | 10 | 4_3_vehicle | service | 29 | 3 | 3 | 3 | | 10 | 4_3_vehicle | service | 2 | 12 | 12 | 12 | | 10 | 4_3_vehicle | service | 16 | 20 | 20 | 20 | | 10 | 4_3_vehicle | service | 50 | 26 | 26 | 26 | | 10 | 4_3_vehicle | service | 21 | 34 | 34 | 34 | | 10 | 4_3_vehicle | end | - | 42 | undef | 42 | +---------+----------------------+-----------------------+-----------------+-----------------+-----------------+-----------------+ | 11 | 1_4_vehicle | start | - | undef | 0 | 0 | | 11 | 1_4_vehicle | service | 13 | 16 | 16 | 16 | | 11 | 1_4_vehicle | service | 41 | 25 | 25 | 25 | | 11 | 1_4_vehicle | service | 40 | 37 | 37 | 37 | | 11 | 1_4_vehicle | service | 19 | 48 | 48 | 48 | | 11 | 1_4_vehicle | service | 42 | 57 | 57 | 57 | | 11 | 1_4_vehicle | end | - | 67 | undef | 67 | +--------------------------------------------------------------------------------------------------------------------------------+
You can find the entire code here.