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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-examples module which contains examples on how to use Drools Planner.

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/*
 * 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.examples.manners2009.solver.solution.initializer;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.drools.FactHandle;
import org.drools.WorkingMemory;
import org.drools.planner.core.phase.custom.CustomSolverPhaseCommand;
import org.drools.planner.core.score.DefaultSimpleScore;
import org.drools.planner.core.score.Score;
import org.drools.planner.core.solution.director.SolutionDirector;
import org.drools.planner.examples.common.domain.PersistableIdComparator;
import org.drools.planner.examples.manners2009.domain.Guest;
import org.drools.planner.examples.manners2009.domain.Manners2009;
import org.drools.planner.examples.manners2009.domain.Seat;
import org.drools.planner.examples.manners2009.domain.SeatDesignation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Manners2009StartingSolutionInitializer implements CustomSolverPhaseCommand {

    protected final transient Logger logger = LoggerFactory.getLogger(getClass());

    public void changeWorkingSolution(SolutionDirector solutionDirector) {
        Manners2009 manners2009 = (Manners2009) solutionDirector.getWorkingSolution();
        initializeSeatDesignationList(solutionDirector, manners2009);
    }

    private void initializeSeatDesignationList(SolutionDirector solutionDirector, Manners2009 manners2009) {
        WorkingMemory workingMemory = solutionDirector.getWorkingMemory();
        // TODO the planning entity list from the solution should be used and might already contain initialized entities
        List seatDesignationList = createSeatDesignationList(manners2009);
        // Assign one guest at a time
        List undesignatedSeatList = manners2009.getSeatList();
        for (SeatDesignation seatDesignation : seatDesignationList) {
            Score bestScore = DefaultSimpleScore.valueOf(Integer.MIN_VALUE);
            Seat bestSeat = null;

            FactHandle seatDesignationHandle = 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()) {
                    seatDesignation.setSeat(seat);
                    if (seatDesignationHandle == null) {
                        seatDesignationHandle = workingMemory.insert(seatDesignation);
                    } else {
                        workingMemory.update(seatDesignationHandle, seatDesignation);
                    }
                    Score score = solutionDirector.calculateScoreFromWorkingMemory();
                    if (score.compareTo(bestScore) > 0) {
                        bestScore = score;
                        bestSeat = seat;
                    }
                }
            }
            if (bestSeat == null) {
                throw new IllegalStateException("The bestSeat (" + bestSeat + ") cannot be null.");
            }
            seatDesignation.setSeat(bestSeat);
            workingMemory.update(seatDesignationHandle, seatDesignation);
            // There will always be enough allowed seats: ok to do this for this problem, but not ok for most problems
            undesignatedSeatList.remove(bestSeat);
        }
        // For the GUI's combobox list mainly, not really needed
        Collections.sort(seatDesignationList, new PersistableIdComparator());
        manners2009.setSeatDesignationList(seatDesignationList);
    }

    private List createSeatDesignationList(Manners2009 manners2009) {
        List seatDesignationList = new ArrayList(manners2009.getGuestList().size());
        for (Guest guest : manners2009.getGuestList()) {
            SeatDesignation seatDesignation = new SeatDesignation();
            seatDesignation.setId(guest.getId());
            seatDesignation.setGuest(guest);
            seatDesignationList.add(seatDesignation);
        }
        return seatDesignationList;
    }

}