Package org.cloudbus.cloudsim.brokers

Class DatacenterBrokerSimple

java.lang.Object

org.cloudbus.cloudsim.core.CloudSimEntity

org.cloudbus.cloudsim.brokers.DatacenterBrokerAbstract

org.cloudbus.cloudsim.brokers.DatacenterBrokerSimple

All Implemented Interfaces:

Cloneable, Comparable<SimEntity>, Runnable, DatacenterBroker, Identifiable, Nameable, SimEntity

Direct Known Subclasses:

DatacenterBrokerBestFit, DatacenterBrokerFirstFit, DatacenterBrokerHeuristic

public class DatacenterBrokerSimple
extends DatacenterBrokerAbstract

A simple implementation of DatacenterBroker that try to host customer's VMs at the first Datacenter found. If there isn't capacity in that one, it will try the other ones.

The default selection of VMs for each cloudlet is based on a Round-Robin policy, cyclically selecting the next VM from the broker VM list for each requesting cloudlet. However, when selection of the closest datacenter is enabled, the broker will try to place each VM at the closest Datacenter as possible, according to their timezone.

Such a policy doesn't check if the selected VM is really suitable for the Cloudlet and may not provide an optimal mapping.

Since:

CloudSim Toolkit 1.0

Author:

Rodrigo N. Calheiros, Anton Beloglazov, Manoel Campos da Silva Filho

See Also:

DatacenterBrokerFirstFit, DatacenterBrokerBestFit, DatacenterBrokerHeuristic

Nested Class Summary

Nested classes/interfaces inherited from interface org.cloudbus.cloudsim.core.SimEntity

SimEntity.State

Field Summary

Fields inherited from class org.cloudbus.cloudsim.brokers.DatacenterBrokerAbstract

SHUTDOWN

Fields inherited from interface org.cloudbus.cloudsim.brokers.DatacenterBroker

DEF_VM_DESTRUCTION_DELAY, LOGGER, NULL

Fields inherited from interface org.cloudbus.cloudsim.core.SimEntity

NULL

Constructor Summary

Constructors

Constructor	Description
DatacenterBrokerSimple(CloudSim simulation)	Creates a new DatacenterBroker.
DatacenterBrokerSimple(CloudSim simulation, String name)	Creates a DatacenterBroker giving a specific name.

Method Summary

Modifier and Type	Method	Description
protected Datacenter	defaultDatacenterMapper(Datacenter lastDatacenter, Vm vm)	The default policy used to select a Datacenter to run waiting VMs.
protected Vm	defaultVmMapper(Cloudlet cloudlet)	The default policy used to select a VM to execute a given Cloudlet.

Methods inherited from class org.cloudbus.cloudsim.brokers.DatacenterBrokerAbstract

addOnVmsCreatedListener, bindCloudletToVm, closestDatacenterMapper, destroyVm, getCloudletCreatedList, getCloudletFinishedList, getCloudletSubmittedList, getCloudletWaitingList, getDatacenter, getDatacenterList, getVmCreatedList, getVmCreationAcks, getVmCreationRequests, getVmDestructionDelayFunction, getVmExecList, getVmFailedList, getVmFromCreatedList, getVmsNumber, getVmWaitingList, getWaitingVm, isRetryFailedVms, isSelectClosestDatacenter, isShutdownWhenIdle, processEvent, removeOnVmsCreatedListener, requestDatacentersToCreateWaitingCloudlets, requestIdleVmDestruction, requestShutdownWhenIdle, setCloudletComparator, setDatacenterMapper, setRetryFailedVms, setSelectClosestDatacenter, setShutdownWhenIdle, setVmComparator, setVmDestructionDelay, setVmDestructionDelayFunction, setVmMapper, shutdown, startInternal, submitCloudlet, submitCloudletList, submitCloudletList, submitCloudletList, submitCloudletList, submitVm, submitVmList, submitVmList, toString

Methods inherited from class org.cloudbus.cloudsim.core.CloudSimEntity

cancelEvent, clone, compareTo, equals, getId, getName, getNextEvent, getNextEvent, getShutdownTime, getSimulation, getStartTime, getState, hashCode, isAlive, isFinished, isStarted, pause, run, run, schedule, schedule, schedule, schedule, schedule, schedule, scheduleFirst, scheduleFirst, scheduleFirstNow, scheduleFirstNow, scheduleNow, scheduleNow, selectEvent, send, send, sendNow, sendNow, setEventBuffer, setId, setName, setSimulation, setState, start, waitForEvent

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.lang.Comparable

compareTo

Methods inherited from interface org.cloudbus.cloudsim.core.Identifiable

getId

Methods inherited from interface org.cloudbus.cloudsim.core.Nameable

getName

Methods inherited from interface org.cloudbus.cloudsim.core.SimEntity

getShutdownTime, getSimulation, getStartTime, getState, isAlive, isFinished, isStarted, run, schedule, schedule, schedule, schedule, schedule, schedule, schedule, setName, setSimulation, setState, start

Constructor Details

DatacenterBrokerSimple

public DatacenterBrokerSimple(CloudSim simulation)

Creates a new DatacenterBroker.

Parameters:

simulation - the CloudSim instance that represents the simulation the Entity is related to

DatacenterBrokerSimple

public DatacenterBrokerSimple(CloudSim simulation,
String name)

Creates a DatacenterBroker giving a specific name.

Parameters:

simulation - the CloudSim instance that represents the simulation the Entity is related to

name - the DatacenterBroker name

Method Details

defaultDatacenterMapper

protected Datacenter defaultDatacenterMapper(Datacenter lastDatacenter,
Vm vm)

The default policy used to select a Datacenter to run waiting VMs.

It applies a Round-Robin policy to cyclically select the next Datacenter from the list. However, it just moves to the next Datacenter when the previous one was not able to create all waiting VMs.

This policy is just used if the selection of the closest Datacenter is not enabled. Otherwise, the DatacenterBrokerAbstract.closestDatacenterMapper(Datacenter, Vm) is used instead.

Specified by:

defaultDatacenterMapper in class DatacenterBrokerAbstract

Parameters:

lastDatacenter - the last selected Datacenter

vm - the VM trying to be created

Returns:

the Datacenter selected to request the creating of waiting VMs or Datacenter.NULL if no suitable Datacenter was found

See Also:

DatacenterBroker.setDatacenterMapper(java.util.function.BiFunction), DatacenterBrokerAbstract.setSelectClosestDatacenter(boolean)

defaultVmMapper

protected Vm defaultVmMapper(Cloudlet cloudlet)

The default policy used to select a VM to execute a given Cloudlet. The method defines the default policy used to map VMs for Cloudlets that are waiting to be created.

Since this policy can be dynamically changed by calling DatacenterBrokerAbstract.setVmMapper(Function), this method will always return the default policy provided by the subclass where the method is being called.

It applies a Round-Robin policy to cyclically select the next Vm from the list of waiting VMs.

Specified by:

defaultVmMapper in class DatacenterBrokerAbstract

Parameters:

cloudlet - the cloudlet that needs a VM to execute

Returns:

the selected Vm for the cloudlet or Vm.NULL if no suitable VM was found

See Also:

DatacenterBrokerAbstract.setVmMapper(Function)