147 lines
2.7 KiB
Java
147 lines
2.7 KiB
Java
/*
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* Title: CloudSim Toolkit
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* Description: CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
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* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
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*
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* Copyright (c) 2009-2012, The University of Melbourne, Australia
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*/
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package org.cloudbus.cloudsim.provisioners;
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import org.cloudbus.cloudsim.Vm;
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/**
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* RamProvisioner is an abstract class that represents the provisioning policy of memory to virtual
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* machines inside a Host. When extending this class, care must be taken to guarantee that the field
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* availableMemory will always contain the amount of free memory available for future allocations.
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*
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* @author Rodrigo N. Calheiros
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* @author Anton Beloglazov
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* @since CloudSim Toolkit 1.0
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*/
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public abstract class RamProvisioner {
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/** The ram. */
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private int ram;
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/** The available ram. */
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private int availableRam;
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/**
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* Creates the new RamProvisioner.
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*
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* @param ram the ram
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*
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* @pre ram>=0
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* @post $none
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*/
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public RamProvisioner(int ram) {
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setRam(ram);
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setAvailableRam(ram);
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}
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/**
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* Allocates RAM for a given VM.
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*
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* @param vm virtual machine for which the RAM are being allocated
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* @param ram the RAM
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*
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* @return $true if the RAM could be allocated; $false otherwise
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*
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* @pre $none
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* @post $none
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*/
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public abstract boolean allocateRamForVm(Vm vm, int ram);
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/**
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* Gets the allocated RAM for VM.
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*
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* @param vm the VM
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*
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* @return the allocated RAM for vm
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*/
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public abstract int getAllocatedRamForVm(Vm vm);
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/**
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* Releases BW used by a VM.
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*
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* @param vm the vm
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*
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* @pre $none
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* @post none
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*/
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public abstract void deallocateRamForVm(Vm vm);
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/**
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* Releases BW used by a all VMs.
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*
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* @pre $none
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* @post none
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*/
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public void deallocateRamForAllVms() {
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setAvailableRam(getRam());
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}
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/**
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* Checks if is suitable for vm.
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*
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* @param vm the vm
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* @param ram the ram
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*
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* @return true, if is suitable for vm
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*/
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public abstract boolean isSuitableForVm(Vm vm, int ram);
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/**
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* Gets the ram.
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*
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* @return the ram
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*/
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public int getRam() {
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return ram;
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}
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/**
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* Sets the ram.
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*
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* @param ram the ram to set
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*/
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protected void setRam(int ram) {
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this.ram = ram;
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}
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/**
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* Gets the amount of used RAM in the host.
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*
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* @return used ram
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*
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* @pre $none
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* @post $none
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*/
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public int getUsedRam() {
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return ram - availableRam;
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}
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/**
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* Gets the available RAM in the host.
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*
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* @return available ram
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*
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* @pre $none
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* @post $none
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*/
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public int getAvailableRam() {
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return availableRam;
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}
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/**
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* Sets the available ram.
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*
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* @param availableRam the availableRam to set
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*/
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protected void setAvailableRam(int availableRam) {
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this.availableRam = availableRam;
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}
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}
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