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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.

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/*
 * Copyright 2016 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.cloudbalancing.optional.realtime;

import java.util.ArrayList;

import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.core.impl.solver.ProblemFactChange;
import org.optaplanner.examples.cloudbalancing.domain.CloudBalance;
import org.optaplanner.examples.cloudbalancing.domain.CloudComputer;
import org.optaplanner.examples.cloudbalancing.domain.CloudProcess;

public class DeleteComputerProblemFactChange implements ProblemFactChange {

    private final CloudComputer computer;

    public DeleteComputerProblemFactChange(CloudComputer computer) {
        this.computer = computer;
    }

    @Override
    public void doChange(ScoreDirector scoreDirector) {
        CloudBalance cloudBalance = scoreDirector.getWorkingSolution();
        CloudComputer workingComputer = scoreDirector.lookUpWorkingObject(computer);
        if (workingComputer == null) {
            // The computer has already been deleted (the UI asked to changed the same computer twice), so do nothing
            return;
        }
        // First remove the problem fact from all planning entities that use it
        for (CloudProcess process : cloudBalance.getProcessList()) {
            if (process.getComputer() == workingComputer) {
                scoreDirector.beforeVariableChanged(process, "computer");
                process.setComputer(null);
                scoreDirector.afterVariableChanged(process, "computer");
            }
        }
        // A SolutionCloner does not clone problem fact lists (such as computerList)
        // Shallow clone the computerList so only workingSolution is affected, not bestSolution or guiSolution
        ArrayList computerList = new ArrayList<>(cloudBalance.getComputerList());
        cloudBalance.setComputerList(computerList);
        // Remove the problem fact itself
        scoreDirector.beforeProblemFactRemoved(workingComputer);
        computerList.remove(workingComputer);
        scoreDirector.afterProblemFactRemoved(workingComputer);
        scoreDirector.triggerVariableListeners();
    }

}