107 lines
4.4 KiB
Java
107 lines
4.4 KiB
Java
// Copyright 2010-2018 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import static java.lang.Math.abs;
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import java.util.logging.Logger;
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import com.google.ortools.constraintsolver.Assignment;
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import com.google.ortools.constraintsolver.FirstSolutionStrategy;
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import com.google.ortools.constraintsolver.RoutingIndexManager;
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import com.google.ortools.constraintsolver.RoutingModel;
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import com.google.ortools.constraintsolver.RoutingSearchParameters;
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import com.google.ortools.constraintsolver.main;
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/** Tests the Routing java interface. */
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public class TestRouting {
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static {
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System.loadLibrary("jniortools");
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}
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private static final Logger logger = Logger.getLogger(TestRouting.class.getName());
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static void testRoutingTransitCallback(boolean enableGC) {
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logger.info("testRoutingTransitCallback (enable gc:" + enableGC + ")...");
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// Create Routing Index Manager
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RoutingIndexManager manager =
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new RoutingIndexManager(5/*location*/, 1/*vehicle*/, 0/*depot*/);
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// Create Routing Model.
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RoutingModel routing = new RoutingModel(manager);
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// Define cost of each arc.
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int transitCallbackIndex;
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if (true) {
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transitCallbackIndex = routing.registerTransitCallback(
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(long fromIndex, long toIndex) -> {
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// Convert from routing variable Index to user NodeIndex.
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int fromNode = manager.indexToNode(fromIndex);
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int toNode = manager.indexToNode(toIndex);
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return abs(toNode - fromNode);
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});
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}
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if (enableGC) {
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System.gc();
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}
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routing.setArcCostEvaluatorOfAllVehicles(transitCallbackIndex);
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// Setting first solution heuristic.
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RoutingSearchParameters searchParameters =
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main.defaultRoutingSearchParameters()
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.toBuilder()
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.setFirstSolutionStrategy(FirstSolutionStrategy.Value.PATH_CHEAPEST_ARC)
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.build();
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// Solve the problem.
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Assignment solution = routing.solveWithParameters(searchParameters);
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if (null == solution) throw new AssertionError("null == solution");
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if (8 != solution.objectiveValue()) throw new AssertionError("5 != objective");
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logger.info("testRoutingTransitCallback (enable gc:" + enableGC + ")...DONE");
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}
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static void testRoutingUnaryTransitCallback(boolean enableGC) {
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logger.info("testRoutingUnaryTransitCallback (enable gc:" + enableGC + ")...");
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// Create Routing Index Manager
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RoutingIndexManager manager =
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new RoutingIndexManager(5/*location*/, 1/*vehicle*/, 0/*depot*/);
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// Create Routing Model.
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RoutingModel routing = new RoutingModel(manager);
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// Define cost of each arc.
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int transitCallbackIndex;
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if (true) {
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transitCallbackIndex = routing.registerUnaryTransitCallback(
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(long fromIndex) -> {
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// Convert from routing variable Index to user NodeIndex.
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int fromNode = manager.indexToNode(fromIndex);
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return abs(fromNode);
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});
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}
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if (enableGC) {
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System.gc();
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}
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routing.setArcCostEvaluatorOfAllVehicles(transitCallbackIndex);
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// Setting first solution heuristic.
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RoutingSearchParameters searchParameters =
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main.defaultRoutingSearchParameters()
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.toBuilder()
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.setFirstSolutionStrategy(FirstSolutionStrategy.Value.PATH_CHEAPEST_ARC)
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.build();
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// Solve the problem.
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Assignment solution = routing.solveWithParameters(searchParameters);
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if (null == solution) throw new AssertionError("null == solution");
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if (10 != solution.objectiveValue()) throw new AssertionError("5 != objective");
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logger.info("testRoutingUnaryTransitCallback (enable gc:" + enableGC + ")...DONE");
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}
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public static void main(String[] args) throws Exception {
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testRoutingTransitCallback(/*enable_gc=*/false);
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testRoutingTransitCallback(/*enable_gc=*/true);
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testRoutingUnaryTransitCallback(/*enable_gc=*/false);
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testRoutingUnaryTransitCallback(/*enable_gc=*/true);
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}
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}
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