org.btrplace.scheduler.choco.SliceRcComparator Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 University Nice Sophia Antipolis
 *
 * This file is part of btrplace.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */

package org.btrplace.scheduler.choco;

import org.btrplace.model.view.ShareableResource;

import java.util.Comparator;

/**
 * Compare slices with regards to the resource consumption of their associated element.
 *
 * @author Fabien Hermenier
 */
public class SliceRcComparator implements Comparator {

    private ShareableResource rc;

    private int ratio;

    /**
     * Make a new comparator.
     *
     * @param r   the resource used to perform the comparison
     * @param asc {@code true} for an ascending comparison
     */
    public SliceRcComparator(ShareableResource r, boolean asc) {
        this.rc = r;
        ratio = asc ? 1 : -1;
    }

    @Override
    public int compare(Slice s1, Slice s2) {
        int x = rc.getConsumption(s1.getSubject());
        int y = rc.getConsumption(s2.getSubject());
        return ratio * (x - y);
    }
}