Package org.cloudbus.cloudsim.provisioners

Interface ResourceProvisioner

All Known Subinterfaces:
PeProvisioner
All Known Implementing Classes:
PeProvisionerSimple, ResourceProvisionerAbstract, ResourceProvisionerSimple
public interface ResourceProvisioner
An interface that represents the provisioning policy used by a Host to provide a given physical resource to its Vms. Each host must have its own instance of a ResourceProvisioner for each Resource it owns, such as Ram, Bandwidth (BW) and Pe (CPU).
Since:
CloudSim Plus 1.0
Author:
Rodrigo N. Calheiros, Anton Beloglazov, Manoel Campos da Silva Filho
To do something:
There is a lot of confusion between Resource Allocation and Resource Provisioning. This article makes it clear: https://www.researchgate.net/post/what_is_the_difference_between_resource_allocation_and_resource_provisioning. Allocation is reservation, while Provisioning is actual usage of some part of the allocated resource. When a VM is created, the Host allocates resources, but the Host.allocateResourcesForVm uses ResourceProvisioners for that. More confusing yet, it calls vmScheduler.allocatePesForVm at the end. The terms allocation and provisioning sometimes are used in the same place. The Host.allocateResourcesForVm method has the word "allocate" in its name, while internally it uses ResourceProvisioners (quite confusing). VmScheduler is using the term "allocation", but since it's accountable for running a VM, it should perform resource provisioning (request the actual amount of the allocated resource to be used in that moment).

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final ResourceProvisioner
    NULL
    An attribute that implements the Null Object Design Pattern for ResourceProvisioner objects.

  • Method Summary

    Modifier and Type
    Method
    Description
    default boolean
    allocateResourceForVm(Vm vm, double newTotalVmResource)
    Allocates an amount of the physical resource for a VM, changing the current capacity of the virtual resource to the given amount.
    boolean
    allocateResourceForVm(Vm vm, long newTotalVmResourceCapacity)
    Allocates an amount of the physical resource for a VM, changing the current capacity of the virtual resource to the given amount.
    long
    deallocateResourceForVm(Vm vm)
    Deallocate the resource for the given VM.
    long
    getAllocatedResourceForVm(Vm vm)
    Gets the amount of resource allocated to a given VM from the physical resource
    long
    getAvailableResource()
    Gets the amount of free available physical resource from the host that the provisioner can allocate to VMs.
    long
    getCapacity()
    Gets the total capacity of the physical resource from the Host that the provisioner manages.
    ResourceManageable
    getPmResource()
    Gets the physical resource being managed by the provisioner, such as Ram, Pe, Bandwidth, etc.
    long
    getTotalAllocatedResource()
    Gets the total amount of resource allocated to all VMs from the physical resource
    boolean
    isSuitableForVm(Vm vm, long newVmTotalAllocatedResource)
    Checks if it is possible to change the current allocated resource for a given VM to a new amount, depending on the available physical resource remaining.
    boolean
    isSuitableForVm(Vm vm, Resource resource)
    Checks if it is possible to change the current allocated resource for a given VM to a new amount, depending on the available physical resource remaining.
    void
    setResources(ResourceManageable pmResource, Function<Vm,ResourceManageable> vmResourceFunction)
    Sets the physical resource to be managed by the provisioner, such as Ram, Pe, Bandwidth, etc.

  • Field Details

    • NULL

      static final ResourceProvisioner NULL
      An attribute that implements the Null Object Design Pattern for ResourceProvisioner objects.

  • Method Details

    • allocateResourceForVm

      boolean allocateResourceForVm(Vm vm, long newTotalVmResourceCapacity)
      Allocates an amount of the physical resource for a VM, changing the current capacity of the virtual resource to the given amount.
      Parameters:
      vm - the virtual machine for which the resource is being allocated
      newTotalVmResourceCapacity - the new total amount of resource to allocate to the VM, changing the allocate resource to this new amount. It doesn't increase the current allocated VM resource by the given amount, instead, it changes the VM allocated resource to that specific amount
      Returns:
      $true if the resource could be allocated; $false otherwise

    • allocateResourceForVm

      default boolean allocateResourceForVm(Vm vm, double newTotalVmResource)
      Allocates an amount of the physical resource for a VM, changing the current capacity of the virtual resource to the given amount.

      This method is just a shorthand to avoid explicitly converting a double to long.

      Parameters:
      vm - the virtual machine for which the resource is being allocated
      newTotalVmResource - the new total amount of resource to allocate to the VM, changing the allocated resource to this new amount. It doesn't increase the current allocated VM resource by the given amount, instead, it changes the VM allocated resource to that specific amount
      Returns:
      $true if the resource could be allocated; $false otherwise
      See Also:

    • getAllocatedResourceForVm

      long getAllocatedResourceForVm(Vm vm)
      Gets the amount of resource allocated to a given VM from the physical resource
      Parameters:
      vm - the VM
      Returns:
      the allocated resource for the VM

    • getTotalAllocatedResource

      long getTotalAllocatedResource()
      Gets the total amount of resource allocated to all VMs from the physical resource
      Returns:
      the total allocated resource among all VMs

    • deallocateResourceForVm

      long deallocateResourceForVm(Vm vm)
      Deallocate the resource for the given VM.
      Parameters:
      vm - the VM to deallocate resource
      Returns:
      the amount of allocated VM resource or zero if VM is not found

    • isSuitableForVm

      boolean isSuitableForVm(Vm vm, long newVmTotalAllocatedResource)
      Checks if it is possible to change the current allocated resource for a given VM to a new amount, depending on the available physical resource remaining.
      Parameters:
      vm - the vm to check if there is enough available resource on the host to change the allocated amount for the VM
      newVmTotalAllocatedResource - the new total amount of resource to be allocated for the VM.
      Returns:
      true, if it is possible to allocate the new total VM resource; false otherwise

    • isSuitableForVm

      boolean isSuitableForVm(Vm vm, Resource resource)
      Checks if it is possible to change the current allocated resource for a given VM to a new amount, depending on the available physical resource remaining.
      Parameters:
      vm - the vm to check if there is enough available resource on the host to change the allocated amount for the VM
      resource - the resource where its capacity it to be allocated for the VM.
      Returns:
      true, if it is possible to allocate the new total VM resource; false otherwise

    • getPmResource

      ResourceManageable getPmResource()
      Gets the physical resource being managed by the provisioner, such as Ram, Pe, Bandwidth, etc.
      Returns:
      the resource managed by this provisioner

    • setResources

      void setResources(ResourceManageable pmResource, Function<Vm,ResourceManageable> vmResourceFunction)
      Sets the physical resource to be managed by the provisioner, such as Ram, Pe, Bandwidth, etc.
      Parameters:
      pmResource - the resource managed by this provisioner
      vmResourceFunction - a Function that receives a Vm and returns the virtual resource corresponding to the PM resource

    • getCapacity

      long getCapacity()
      Gets the total capacity of the physical resource from the Host that the provisioner manages.
      Returns:
      the total physical resource capacity

    • getAvailableResource

      long getAvailableResource()
      Gets the amount of free available physical resource from the host that the provisioner can allocate to VMs.
      Returns:
      the amount of free available physical resource