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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.travelingtournament.optional.score;
import static org.optaplanner.core.api.score.stream.Joiners.equal;
import org.optaplanner.core.api.score.buildin.hardsoft.HardSoftScore;
import org.optaplanner.core.api.score.stream.Constraint;
import org.optaplanner.core.api.score.stream.ConstraintFactory;
import org.optaplanner.core.api.score.stream.ConstraintProvider;
import org.optaplanner.examples.travelingtournament.domain.Day;
import org.optaplanner.examples.travelingtournament.domain.Match;
public final class TravelingTournamentConstraintProvider implements ConstraintProvider {
@Override
public Constraint[] defineConstraints(ConstraintFactory constraintFactory) {
return new Constraint[] {
fourConsecutiveHomeMatches(constraintFactory),
fourConsecutiveAwayMatches(constraintFactory),
repeatMatchOnTheNextDay(constraintFactory),
startToAwayHop(constraintFactory),
homeToAwayHop(constraintFactory),
awayToAwayHop(constraintFactory),
awayToHomeHop(constraintFactory),
awayToEndHop(constraintFactory)
};
}
private Constraint fourConsecutiveHomeMatches(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.ifExists(Match.class, equal(Match::getHomeTeam),
equal(match -> getDayIndex(match) + 1, TravelingTournamentConstraintProvider::getDayIndex))
.ifExists(Match.class, equal(Match::getHomeTeam),
equal(match -> getDayIndex(match) + 2, TravelingTournamentConstraintProvider::getDayIndex))
.ifExists(Match.class, equal(Match::getHomeTeam),
equal(match -> getDayIndex(match) + 3, TravelingTournamentConstraintProvider::getDayIndex))
.penalize("4 consecutive home matches", HardSoftScore.ONE_HARD);
}
private Constraint fourConsecutiveAwayMatches(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.ifExists(Match.class, equal(Match::getAwayTeam),
equal(match -> getDayIndex(match) + 1, TravelingTournamentConstraintProvider::getDayIndex))
.ifExists(Match.class, equal(Match::getAwayTeam),
equal(match -> getDayIndex(match) + 2, TravelingTournamentConstraintProvider::getDayIndex))
.ifExists(Match.class, equal(Match::getAwayTeam),
equal(match -> getDayIndex(match) + 3, TravelingTournamentConstraintProvider::getDayIndex))
.penalize("4 consecutive away matches", HardSoftScore.ONE_HARD);
}
private Constraint repeatMatchOnTheNextDay(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.ifExists(Match.class, equal(Match::getHomeTeam, Match::getAwayTeam),
equal(Match::getAwayTeam, Match::getHomeTeam),
equal(match -> getDayIndex(match) + 1, TravelingTournamentConstraintProvider::getDayIndex))
.penalize("Repeat match on the next day", HardSoftScore.ONE_HARD);
}
private Constraint startToAwayHop(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.ifNotExists(Day.class,
equal(match -> getDayIndex(match) - 1, Day::getIndex))
.penalize("Start to away hop", HardSoftScore.ONE_SOFT,
match -> match.getAwayTeam().getDistance(match.getHomeTeam()));
}
private Constraint homeToAwayHop(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.join(Match.class, equal(Match::getHomeTeam, Match::getAwayTeam),
equal(match -> getDayIndex(match) + 1, TravelingTournamentConstraintProvider::getDayIndex))
.penalize("Home to away hop", HardSoftScore.ONE_SOFT,
(match, otherMatch) -> match.getHomeTeam().getDistance(otherMatch.getHomeTeam()));
}
private Constraint awayToAwayHop(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.join(Match.class, equal(Match::getAwayTeam, Match::getAwayTeam),
equal(match -> getDayIndex(match) + 1, TravelingTournamentConstraintProvider::getDayIndex))
.penalize("Away to away hop", HardSoftScore.ONE_SOFT,
(match, otherMatch) -> match.getHomeTeam().getDistance(otherMatch.getHomeTeam()));
}
private Constraint awayToHomeHop(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.join(Match.class, equal(Match::getAwayTeam, Match::getHomeTeam),
equal(match -> getDayIndex(match) + 1, TravelingTournamentConstraintProvider::getDayIndex))
.penalize("Away to home hop", HardSoftScore.ONE_SOFT,
(match, otherMatch) -> match.getHomeTeam().getDistance(match.getAwayTeam()));
}
private Constraint awayToEndHop(ConstraintFactory constraintFactory) {
return constraintFactory.from(Match.class)
.ifNotExists(Day.class, equal(match -> getDayIndex(match) + 1, Day::getIndex))
.penalize("Away to end hop", HardSoftScore.ONE_SOFT,
match -> match.getHomeTeam().getDistance(match.getAwayTeam()));
}
private static int getDayIndex(Match match) {
return match.getDay().getIndex();
}
}