Package org.cloudsimplus.autoscaling

Class VmScalingAbstract

java.lang.Object

org.cloudsimplus.autoscaling.VmScalingAbstract

All Implemented Interfaces:

VmScaling

Direct Known Subclasses:

HorizontalVmScalingSimple, VerticalVmScalingAbstract

public abstract class VmScalingAbstract
extends Object
implements VmScaling

An abstract class for implementing HorizontalVmScaling and VerticalVmScaling.

Since:

CloudSim Plus 1.1.0

Author:

Manoel Campos da Silva Filho

Field Summary

Fields inherited from interface org.cloudsimplus.autoscaling.VmScaling

LOGGER, NULL

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	VmScalingAbstract()

Method Summary

Modifier and Type	Method	Description
Vm	getVm()	Gets the Vm that this Load Balancer is linked to.
protected boolean	isTimeToCheckPredicate(double time)	Checks if it is time to evaluate weather the Vm is under or overloaded.
protected abstract boolean	requestUpScaling(double time)	Performs the actual request to scale the Vm up or down, depending on whether it is over or underloaded, respectively.
protected void	setLastProcessingTime(double lastProcessingTime)	Sets the last time the scheduler checked for VM overload.
void	setVm(Vm vm)	Sets a Vm to this Load Balancer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.cloudsimplus.autoscaling.VmScaling

requestUpScalingIfPredicateMatches

Constructor Details

VmScalingAbstract

protected VmScalingAbstract()

Method Details

getVm

public Vm getVm()

Description copied from interface: VmScaling

Gets the Vm that this Load Balancer is linked to.

Specified by:

getVm in interface VmScaling

Returns:

setVm

public void setVm(Vm vm)

Description copied from interface: VmScaling

Sets a Vm to this Load Balancer. The broker will call this Load Balancer in order to balance load when its Vm is over utilized.

When the VmScaling is assigned to a Vm, the Vm sets itself to the VmScaling object, creating an association between the two objects.

Specified by:

setVm in interface VmScaling

Parameters:

vm - the Vm to set

isTimeToCheckPredicate

protected boolean isTimeToCheckPredicate(double time)

Checks if it is time to evaluate weather the Vm is under or overloaded.

Parameters:

time - current simulation time

Returns:

true if it's time to check weather the Vm is over and underloaded, false otherwise

requestUpScaling

protected abstract boolean requestUpScaling(double time)

Performs the actual request to scale the Vm up or down, depending on whether it is over or underloaded, respectively. This method is automatically called by VmScaling.requestUpScalingIfPredicateMatches(org.cloudsimplus.listeners.VmHostEventInfo) when it is verified that the Vm is over or underloaded.

Parameters:

time - current simulation time

Returns:

true if the request was actually sent, false otherwise

setLastProcessingTime

protected void setLastProcessingTime(double lastProcessingTime)

Sets the last time the scheduler checked for VM overload.

Parameters:

lastProcessingTime - the processing time to set