/*
* Copyright 2012 JBoss Inc
*
* Licensed 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 org.drools.planner.core.heuristic.selector.entity.decorator;
import java.util.Iterator;
import java.util.Random;
import org.drools.planner.core.heuristic.selector.SelectorTestUtils;
import org.drools.planner.core.heuristic.selector.common.SelectionCacheType;
import org.drools.planner.core.heuristic.selector.common.decorator.SelectionProbabilityWeightFactory;
import org.drools.planner.core.heuristic.selector.entity.EntitySelector;
import org.drools.planner.core.phase.AbstractSolverPhaseScope;
import org.drools.planner.core.phase.step.AbstractStepScope;
import org.drools.planner.core.score.director.ScoreDirector;
import org.drools.planner.core.solver.scope.DefaultSolverScope;
import org.drools.planner.core.testdata.domain.TestdataEntity;
import org.junit.Test;
import static org.drools.planner.core.testdata.util.PlannerAssert.*;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.*;
public class ProbabilityEntitySelectorTest {
@Test
public void randomSelection() {
EntitySelector childEntitySelector = SelectorTestUtils.mockEntitySelector(TestdataEntity.class,
new TestdataEntity("e1"), new TestdataEntity("e2"), new TestdataEntity("e3"), new TestdataEntity("e4"));
SelectionProbabilityWeightFactory<TestdataEntity> probabilityWeightFactory = new SelectionProbabilityWeightFactory<TestdataEntity>() {
public double createProbabilityWeight(ScoreDirector scoreDirector, TestdataEntity entity) {
if (entity.getCode().equals("e1")) {
return 1000.0;
} else if (entity.getCode().equals("e2")) {
return 200.0;
} else if (entity.getCode().equals("e3")) {
return 30.0;
} else if (entity.getCode().equals("e4")) {
return 4.0;
} else {
throw new IllegalStateException("Unknown entity (" + entity + ").");
}
}
};
EntitySelector entitySelector = new ProbabilityEntitySelector(childEntitySelector, SelectionCacheType.STEP,
probabilityWeightFactory);
Random workingRandom = mock(Random.class);
when(workingRandom.nextDouble()).thenReturn(1222.0 / 1234.0, 111.0 / 1234.0, 0.0, 1230.0 / 1234.0, 1199.0 / 1234.0);
DefaultSolverScope solverScope = mock(DefaultSolverScope.class);
when(solverScope.getWorkingRandom()).thenReturn(workingRandom);
entitySelector.solvingStarted(solverScope);
AbstractSolverPhaseScope phaseScopeA = mock(AbstractSolverPhaseScope.class);
when(phaseScopeA.getSolverScope()).thenReturn(solverScope);
when(phaseScopeA.getWorkingRandom()).thenReturn(workingRandom);
entitySelector.phaseStarted(phaseScopeA);
AbstractStepScope stepScopeA1 = mock(AbstractStepScope.class);
when(stepScopeA1.getPhaseScope()).thenReturn(phaseScopeA);
when(stepScopeA1.getWorkingRandom()).thenReturn(workingRandom);
entitySelector.stepStarted(stepScopeA1);
assertEquals(false, entitySelector.isContinuous());
assertEquals(true, entitySelector.isNeverEnding());
assertEquals(4L, entitySelector.getSize());
Iterator<Object> iterator = entitySelector.iterator();
assertTrue(iterator.hasNext());
assertCode("e3", iterator.next());
assertTrue(iterator.hasNext());
assertCode("e1", iterator.next());
assertTrue(iterator.hasNext());
assertCode("e1", iterator.next());
assertTrue(iterator.hasNext());
assertCode("e4", iterator.next());
assertTrue(iterator.hasNext());
assertCode("e2", iterator.next());
assertTrue(iterator.hasNext());
entitySelector.stepEnded(stepScopeA1);
entitySelector.phaseEnded(phaseScopeA);
entitySelector.solvingEnded(solverScope);
verifySolverPhaseLifecycle(childEntitySelector, 1, 1, 1);
verify(childEntitySelector, times(1)).iterator();
}
}