org.optaplanner.examples.cloudbalancing.optional.domain.CloudComputerStrengthComparator Maven / Gradle / Ivy

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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.domain;

import static java.util.Comparator.comparing;
import static java.util.Comparator.comparingInt;

import java.io.Serializable;
import java.util.Collections;
import java.util.Comparator;

import org.optaplanner.examples.cloudbalancing.domain.CloudComputer;

public class CloudComputerStrengthComparator implements Comparator,
        Serializable {

    private static final Comparator COMPARATOR = comparingInt(CloudComputer::getMultiplicand)
            .thenComparing(Collections.reverseOrder(comparing(CloudComputer::getCost))) // Descending (but this is debatable)
            .thenComparingLong(CloudComputer::getId);

    @Override
    public int compare(CloudComputer a, CloudComputer b) {
        return COMPARATOR.compare(a, b);
    }
}