/*
* Title: CloudSim Toolkit
* Description: CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
* Licence: GPL - http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2009-2012, The University of Melbourne, Australia
*/
package org.cloudbus.cloudsim;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* VmSchedulerSpaceShared is a VMM allocation policy that allocates one or more PEs from a host to a
* Virtual Machine Monitor (VMM), and doesn't allow sharing of PEs.
* The allocated PEs will be used until the VM finishes running.
* If there is no enough free PEs as required by a VM,
* or whether the available PEs doesn't have enough capacity, the allocation fails.
* In the case of fail, no PE is allocated to the requesting VM.
*
* @author Rodrigo N. Calheiros
* @author Anton Beloglazov
* @since CloudSim Toolkit 1.0
*/
public class VmSchedulerSpaceShared extends VmScheduler {
/** A map between each VM and its allocated PEs, where the key is a VM ID and
* the value a list of PEs allocated to VM. */
private Map<String, List<Pe>> peAllocationMap;
/** The list of free PEs yet available in the host. */
private List<Pe> freePes;
/**
* Instantiates a new vm space-shared scheduler.
*
* @param pelist the pelist
*/
public VmSchedulerSpaceShared(List<? extends Pe> pelist) {
super(pelist);
setPeAllocationMap(new HashMap<String, List<Pe>>());
setFreePes(new ArrayList<Pe>());
getFreePes().addAll(pelist);
}
@Override
public boolean allocatePesForVm(Vm vm, List<Double> mipsShare) {
// if there is no enough free PEs, fails
if (getFreePes().size() < mipsShare.size()) {
return false;
}
List<Pe> selectedPes = new ArrayList<Pe>();
Iterator<Pe> peIterator = getFreePes().iterator();
Pe pe = peIterator.next();
double totalMips = 0;
for (Double mips : mipsShare) {
if (mips <= pe.getMips()) {
selectedPes.add(pe);
if (!peIterator.hasNext()) {
break;
}
pe = peIterator.next();
totalMips += mips;
}
}
if (mipsShare.size() > selectedPes.size()) {
return false;
}
getFreePes().removeAll(selectedPes);
getPeAllocationMap().put(vm.getUid(), selectedPes);
getMipsMap().put(vm.getUid(), mipsShare);
setAvailableMips(getAvailableMips() - totalMips);
return true;
}
@Override
public void deallocatePesForVm(Vm vm) {
getFreePes().addAll(getPeAllocationMap().get(vm.getUid()));
getPeAllocationMap().remove(vm.getUid());
double totalMips = 0;
for (double mips : getMipsMap().get(vm.getUid())) {
totalMips += mips;
}
setAvailableMips(getAvailableMips() + totalMips);
getMipsMap().remove(vm.getUid());
}
/**
* Sets the pe allocation map.
*
* @param peAllocationMap the pe allocation map
*/
protected void setPeAllocationMap(Map<String, List<Pe>> peAllocationMap) {
this.peAllocationMap = peAllocationMap;
}
/**
* Gets the pe allocation map.
*
* @return the pe allocation map
*/
protected Map<String, List<Pe>> getPeAllocationMap() {
return peAllocationMap;
}
/**
* Sets the free pes list.
*
* @param freePes the new free pes list
*/
protected void setFreePes(List<Pe> freePes) {
this.freePes = freePes;
}
/**
* Gets the free pes list.
*
* @return the free pes list
*/
protected List<Pe> getFreePes() {
return freePes;
}
}