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OptaPlanner solves planning problems.
This lightweight, embeddable planning engine implements powerful and scalable algorithms
to optimize business resource scheduling and planning.
This module contains the examples which demonstrate how to use it in a normal Java application.
/*
* Copyright 2020 Red Hat, Inc. and/or its affiliates.
*
* 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.optaplanner.examples.dinnerparty.solver.solution.initializer;
import java.util.ArrayList;
import java.util.List;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.api.score.buildin.simple.SimpleScore;
import org.optaplanner.core.impl.phase.custom.AbstractCustomPhaseCommand;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.dinnerparty.domain.DinnerParty;
import org.optaplanner.examples.dinnerparty.domain.Seat;
import org.optaplanner.examples.dinnerparty.domain.SeatDesignation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DinnerPartySolutionInitializer extends AbstractCustomPhaseCommand {
protected final transient Logger logger = LoggerFactory.getLogger(getClass());
@Override
public void changeWorkingSolution(ScoreDirector scoreDirector) {
DinnerParty dinnerParty = scoreDirector.getWorkingSolution();
initializeSeatDesignationList(scoreDirector, dinnerParty);
}
private void initializeSeatDesignationList(ScoreDirector scoreDirector, DinnerParty dinnerParty) {
// Assign one guest at a time
List undesignatedSeatList = new ArrayList<>(dinnerParty.getSeatList());
for (SeatDesignation seatDesignation : dinnerParty.getSeatDesignationList()) {
Score bestScore = SimpleScore.of(Integer.MIN_VALUE);
Seat bestSeat = null;
// Try every seat for that guest
// TODO by reordening the seats so index 0 has a different table then index 1 and so on,
// this will probably be faster because perfectMatch will be true sooner
for (Seat seat : undesignatedSeatList) {
if (seatDesignation.getGuest().getGender() == seat.getRequiredGender()) {
scoreDirector.beforeVariableChanged(seatDesignation, "seat");
seatDesignation.setSeat(seat);
scoreDirector.afterVariableChanged(seatDesignation, "seat");
scoreDirector.triggerVariableListeners();
Score score = scoreDirector.calculateScore();
if (score.withInitScore(0).compareTo(bestScore.withInitScore(0)) > 0) {
bestScore = score;
bestSeat = seat;
}
}
}
if (bestSeat == null) {
throw new IllegalStateException("The bestSeat (" + bestSeat + ") cannot be null.");
}
scoreDirector.beforeVariableChanged(seatDesignation, "seat");
seatDesignation.setSeat(bestSeat);
scoreDirector.afterVariableChanged(seatDesignation, "seat");
scoreDirector.triggerVariableListeners();
// There will always be enough allowed seats: ok to do this for this problem, but not ok for most problems
undesignatedSeatList.remove(bestSeat);
}
}
}