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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.move;

import java.util.Arrays;
import java.util.Collection;
import java.util.Objects;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.optaplanner.core.impl.heuristic.move.AbstractMove;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.cloudbalancing.domain.CloudBalance;
import org.optaplanner.examples.cloudbalancing.domain.CloudComputer;
import org.optaplanner.examples.cloudbalancing.domain.CloudProcess;

public class CloudProcessSwapMove extends AbstractMove {

    private CloudProcess leftCloudProcess;
    private CloudProcess rightCloudProcess;

    public CloudProcessSwapMove(CloudProcess leftCloudProcess, CloudProcess rightCloudProcess) {
        this.leftCloudProcess = leftCloudProcess;
        this.rightCloudProcess = rightCloudProcess;
    }

    @Override
    public boolean isMoveDoable(ScoreDirector scoreDirector) {
        return !Objects.equals(leftCloudProcess.getComputer(), rightCloudProcess.getComputer());
    }

    @Override
    public CloudProcessSwapMove createUndoMove(ScoreDirector scoreDirector) {
        return new CloudProcessSwapMove(rightCloudProcess, leftCloudProcess);
    }

    @Override
    protected void doMoveOnGenuineVariables(ScoreDirector scoreDirector) {
        CloudComputer oldLeftCloudComputer = leftCloudProcess.getComputer();
        CloudComputer oldRightCloudComputer = rightCloudProcess.getComputer();
        scoreDirector.beforeVariableChanged(leftCloudProcess, "computer");
        leftCloudProcess.setComputer(oldRightCloudComputer);
        scoreDirector.afterVariableChanged(leftCloudProcess, "computer");
        scoreDirector.beforeVariableChanged(rightCloudProcess, "computer");
        rightCloudProcess.setComputer(oldLeftCloudComputer);
        scoreDirector.afterVariableChanged(rightCloudProcess, "computer");
    }

    @Override
    public CloudProcessSwapMove rebase(ScoreDirector destinationScoreDirector) {
        return new CloudProcessSwapMove(destinationScoreDirector.lookUpWorkingObject(leftCloudProcess),
                destinationScoreDirector.lookUpWorkingObject(rightCloudProcess));
    }

    @Override
    public Collection getPlanningEntities() {
        return Arrays.asList(leftCloudProcess, rightCloudProcess);
    }

    @Override
    public Collection getPlanningValues() {
        return Arrays.asList(leftCloudProcess.getComputer(), rightCloudProcess.getComputer());
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (o instanceof CloudProcessSwapMove) {
            CloudProcessSwapMove other = (CloudProcessSwapMove) o;
            return new EqualsBuilder()
                    .append(leftCloudProcess, other.leftCloudProcess)
                    .append(rightCloudProcess, other.rightCloudProcess)
                    .isEquals();
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return new HashCodeBuilder()
                .append(leftCloudProcess)
                .append(rightCloudProcess)
                .toHashCode();
    }

    @Override
    public String toString() {
        return leftCloudProcess + " {" + leftCloudProcess.getComputer() +  "} <-> "
                + rightCloudProcess + " {" + rightCloudProcess.getComputer() + "}";
    }

}