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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
/*
* 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 extends ResourceManageable> 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());
}
}
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