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CloudSim Plus: A modern, highly extensible and easier-to-use Java 8 Framework for Modeling and Simulation of Cloud Computing Infrastructures and Services

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/*
 * CloudSim Plus: A modern, highly-extensible and easier-to-use Framework for
 * Modeling and Simulation of Cloud Computing Infrastructures and Services.
 * http://cloudsimplus.org
 *
 *     Copyright (C) 2015-2021 Universidade da Beira Interior (UBI, Portugal) and
 *     the Instituto Federal de Educação Ciência e Tecnologia do Tocantins (IFTO, Brazil).
 *
 *     This file is part of CloudSim Plus.
 *
 *     CloudSim Plus is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     CloudSim Plus 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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with CloudSim Plus. If not, see .
 */
package org.cloudsimplus.autoscaling;

import org.cloudbus.cloudsim.brokers.DatacenterBroker;
import org.cloudbus.cloudsim.resources.*;
import org.cloudbus.cloudsim.vms.Vm;
import org.cloudsimplus.autoscaling.resources.ResourceScaling;
import org.cloudsimplus.autoscaling.resources.ResourceScalingGradual;

/**
 * A {@link VerticalVmScaling} implementation which allows a {@link DatacenterBroker}
 * to perform on demand up or down scaling for some {@link Vm} resource, such as {@link Ram},
 * {@link Pe} or {@link Bandwidth}.
 *
 * For each resource that is required to be scaled, a distinct {@link VerticalVmScaling}
 * instance must be assigned to the VM to be scaled.
 *
 * @author Manoel Campos da Silva Filho
 * @since CloudSim Plus 1.1.0
 */
public class VerticalVmScalingSimple extends VerticalVmScalingAbstract {

    /**
     * Creates a VerticalVmScalingSimple with a {@link ResourceScalingGradual} scaling type.
     *
     * @param resourceClassToScale the class of Vm resource that this scaling object will request
     *                             up or down scaling (such as {@link Ram}.class,
     *                             {@link Bandwidth}.class or {@link Processor}.class).
     * @param scalingFactor the factor (a percentage value in scale from 0 to 1)
     *                      that will be used to scale a Vm resource up or down,
     *                      whether such a resource is over or underloaded, according to the
     *                      defined predicates.
     *                      In the case of up scaling, the value 1 will scale the resource in 100%,
     *                      doubling its capacity.
     * @see VerticalVmScaling#setResourceScaling(ResourceScaling)
     */
    public VerticalVmScalingSimple(final Class resourceClassToScale, final double scalingFactor){
        super(resourceClassToScale, new ResourceScalingGradual(), scalingFactor);
    }

    @Override
    public boolean isVmUnderloaded() {
        return getResource().getPercentUtilization() < getLowerThresholdFunction().apply(getVm());
    }

    @Override
    public boolean isVmOverloaded() {
        return getResource().getPercentUtilization() > getUpperThresholdFunction().apply(getVm());
    }
}