120 lines
3.0 KiB
Java
120 lines
3.0 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;
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import java.util.List;
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import java.util.Map;
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/**
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* VmAllocationPolicy is an abstract class that represents the provisioning policy of hosts to
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* virtual machines in a Datacentre. It supports two-stage commit of reservation of hosts: first, we
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* reserve the host and, once commited by the user, it is effectivelly allocated to he/she
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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 VmAllocationPolicy {
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/** The host list. */
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private List<? extends Host> hostList;
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/**
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* Allocates a new VmAllocationPolicy object.
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*
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* @param list Machines available in this Datacentre
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* @pre $none
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* @post $none
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*/
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public VmAllocationPolicy(List<? extends Host> list) {
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setHostList(list);
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}
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/**
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* Allocates a host for a given VM. The host to be allocated is the one that was already
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* reserved.
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*
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* @param vm virtual machine which the host is reserved to
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* @return $true if the host could be allocated; $false otherwise
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* @pre $none
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* @post $none
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*/
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public abstract boolean allocateHostForVm(Vm vm);
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/**
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* Allocates a specified host for a given VM.
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*
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* @param vm virtual machine which the host is reserved to
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* @return $true if the host could be allocated; $false otherwise
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* @pre $none
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* @post $none
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*/
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public abstract boolean allocateHostForVm(Vm vm, Host host);
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/**
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* Optimize allocation of the VMs according to current utilization.
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*
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* @param vmList the vm list
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* @param utilizationBound the utilization bound
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* @param time the time
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* @return the array list< hash map< string, object>>
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*/
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public abstract List<Map<String, Object>> optimizeAllocation(List<? extends Vm> vmList);
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/**
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* Releases the host used by a VM.
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*
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* @param vm the vm
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* @pre $none
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* @post $none
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*/
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public abstract void deallocateHostForVm(Vm vm);
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/**
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* Get the host that is executing the given VM belonging to the given user.
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*
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* @param vm the vm
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* @return the Host with the given vmID and userID; $null if not found
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* @pre $none
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* @post $none
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*/
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public abstract Host getHost(Vm vm);
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/**
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* Get the host that is executing the given VM belonging to the given user.
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*
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* @param vmId the vm id
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* @param userId the user id
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* @return the Host with the given vmID and userID; $null if not found
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* @pre $none
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* @post $none
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*/
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public abstract Host getHost(int vmId, int userId);
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/**
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* Sets the host list.
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*
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* @param hostList the new host list
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*/
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protected void setHostList(List<? extends Host> hostList) {
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this.hostList = hostList;
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}
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/**
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* Gets the host list.
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*
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* @return the host list
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*/
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@SuppressWarnings("unchecked")
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public <T extends Host> List<T> getHostList() {
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return (List<T>) hostList;
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}
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}
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