Interface CloudletTaskScheduler

All Known Implementing Classes:

CloudletTaskSchedulerSimple

public interface CloudletTaskScheduler

Provides the features to enable a CloudletScheduler to process internal CloudletTasks such as:

• processing of CloudletExecutionTasks;
• sending VmPackets from the Vm of the scheduler to other ones;
• or receiving VmPackets sent from other VMs to that Vm.

The packet dispatching is performed by processing CloudletTasks inside a NetworkCloudlet.

A researcher creating its own simulations using CloudSim Plus, usually doesn't have to care about this class. Even creating network-enabled simulations, using objects such as NetworkDatacenter, NetworkHost, NetworkVm and NetworkCloudlet, the NetworkHost will automatically create instances of the current interface and attach each one to the CloudletScheduler that every Vm is using, no matter what kind of scheduler it is.

Since:

CloudSim Plus 1.0

Author:

Saurabh Kumar Garg, Manoel Campos da Silva Filho

Field Summary

Fields

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

Method Summary

Modifier and Type	Method	Description
boolean	addPacketToListOfPacketsSentFromVm(VmPacket pkt)	Adds a packet to the list of packets sent by a given VM, targeting the VM of this scheduler.
void	clearVmPacketsToSend()	Clears the list of VmPacket's to send from the Vm of this scheduler to other VMs.
Vm	getVm()
List<VmPacket>	getVmPacketsToSend()
boolean	isTimeToUpdateCloudletProcessing(Cloudlet cloudlet)	Checks if it's time to update the execution of a given Cloudlet.
void	processCloudletTasks(Cloudlet cloudlet, long partialFinishedMI)	Process Cloudlet's tasks, such as tasks to send packets from or received by a Cloudlet inside a VM.
CloudletTaskScheduler	setVm(Vm vm)	Sets the Vm that the CloudletTaskScheduler will receive packets from or send packets to.

Field Details

NULL

static final CloudletTaskScheduler NULL

An attribute that implements the Null Object Design Pattern for CloudletTaskScheduler objects.

Method Details

getVm

Vm getVm()

Returns:

the Vm that the CloudletTaskScheduler will receive packets from or send packets to.

setVm

CloudletTaskScheduler setVm(Vm vm)

Sets the Vm that the CloudletTaskScheduler will receive packets from or send packets to. It is not required to manually set a Vm for the CloudletTaskScheduler, since the NetworkHost does it when it creates a Vm.

Parameters:

vm - the Vm to set

clearVmPacketsToSend

void clearVmPacketsToSend()

Clears the list of VmPacket's to send from the Vm of this scheduler to other VMs.

getVmPacketsToSend

List<VmPacket> getVmPacketsToSend()

Returns:

read-only list of VmPacket's to send from the Vm of this scheduler to other VMs.

addPacketToListOfPacketsSentFromVm

boolean addPacketToListOfPacketsSentFromVm(VmPacket pkt)

Adds a packet to the list of packets sent by a given VM, targeting the VM of this scheduler. The source VM is got from the packet.

Parameters:

pkt - packet to be added to the list

Returns:

true if the packet was added, false otherwise

processCloudletTasks

void processCloudletTasks(Cloudlet cloudlet,
 long partialFinishedMI)

Process Cloudlet's tasks, such as tasks to send packets from or received by a Cloudlet inside a VM.

Parameters:

cloudlet - the Cloudlet to process packets

partialFinishedMI - the partial executed length of this Cloudlet (in MI)

isTimeToUpdateCloudletProcessing

boolean isTimeToUpdateCloudletProcessing(Cloudlet cloudlet)

Checks if it's time to update the execution of a given Cloudlet. If the Cloudlet is waiting for packets to be sent or received, then it isn't time to update its processing.

Parameters:

cloudlet - the Cloudlet to check if it is time to update its execution

Returns:

true if it's time to update Cloudlet execution, false otherwise.