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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule
engine powered score calculation. This is the drools-planner-core module which contains metaheuristic
algorithms.
/*
* Copyright 2010 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.localsearch.decider.selector;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.drools.planner.core.localsearch.LocalSearchSolverPhaseScope;
import org.drools.planner.core.localsearch.LocalSearchStepScope;
import org.drools.planner.core.localsearch.decider.Decider;
import org.drools.planner.core.move.Move;
import org.drools.planner.core.move.factory.MoveFactory;
public class MoveFactorySelector extends AbstractSelector {
protected MoveFactory moveFactory;
protected boolean shuffle = true;
public void setMoveFactory(MoveFactory moveFactory) {
this.moveFactory = moveFactory;
}
public void setShuffle(boolean shuffle) {
this.shuffle = shuffle;
}
@Override
public void setDecider(Decider decider) {
super.setDecider(decider);
moveFactory.setDecider(decider);
}
// ************************************************************************
// Worker methods
// ************************************************************************
@Override
public void phaseStarted(LocalSearchSolverPhaseScope localSearchSolverPhaseScope) {
moveFactory.phaseStarted(localSearchSolverPhaseScope);
}
@Override
public void beforeDeciding(LocalSearchStepScope localSearchStepScope) {
moveFactory.beforeDeciding(localSearchStepScope);
}
public Iterator moveIterator(LocalSearchStepScope localSearchStepScope) {
return selectMoveList(localSearchStepScope).iterator();
}
public List selectMoveList(LocalSearchStepScope localSearchStepScope) {
List moveList = moveFactory.createMoveList(localSearchStepScope.getWorkingSolution());
if (shuffle) {
Collections.shuffle(moveList, localSearchStepScope.getWorkingRandom());
}
return moveList;
}
@Override
public void stepTaken(LocalSearchStepScope localSearchStepScope) {
moveFactory.stepTaken(localSearchStepScope);
}
@Override
public void phaseEnded(LocalSearchSolverPhaseScope localSearchSolverPhaseScope) {
moveFactory.phaseEnded(localSearchSolverPhaseScope);
}
}