com.martensigwart.fakeload

Class LoadController

java.lang.Object

com.martensigwart.fakeload.LoadController

All Implemented Interfaces:

Runnable

public final class LoadController
extends Object
implements Runnable

This class acts as the controlling entity of the DefaultSimulationInfrastructure.

The LoadController is responsible for managing the desired and actual system load. The desired system load represents the load the user wants to simulate and the actual system load represents the actual system load that is being simulated.

All increases and decreases of FakeLoad requests arriving at DefaultSimulationInfrastructure get propagated to the LoadController. The LoadController then uses an instance of type SystemLoad to keep track of the currently desired system load. Within the SystemLoad instance, the load instructions arriving from different FakeLoads get aggregated.

After the desired system load has been determined by the SystemLoad instance, the LoadController propagates the desired load information to the individual threads responsible for actual load simulation.

The LoadController is also responsible for adjusting the actual system load produced by the simulator threads. Whenever a significant deviation between desired target load and actual system load is detected, the class adjusts the load slightly in the direction of target. This way the load generated by the simulator threads actually reaches the desired level.

Since:

1.8

See Also:

DefaultSimulationInfrastructure, SystemLoad

Constructor Summary

Constructors

Constructor and Description
LoadController(SystemLoad systemLoad, List<CpuSimulator> cpuSimulators, MemorySimulator memorySimulator, DiskInputSimulator diskInputSimulator, DiskOutputSimulator diskOutputSimulator)

Method Summary

Modifier and Type	Method and Description
void	decreaseSystemLoadBy(FakeLoad load)
List<CpuSimulator>	getCpuSimulators()
DiskInputSimulator	getDiskInputSimulator()
DiskOutputSimulator	getDiskOutputSimulator()
MemorySimulator	getMemorySimulator()
void	increaseSystemLoadBy(FakeLoad load)
void	run()

Methods inherited from class java.lang.Object

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

Constructor Detail

LoadController

public LoadController(SystemLoad systemLoad,
                      List<CpuSimulator> cpuSimulators,
                      MemorySimulator memorySimulator,
                      DiskInputSimulator diskInputSimulator,
                      DiskOutputSimulator diskOutputSimulator)

Method Detail

run

public void run()

Specified by:

run in interface Runnable

increaseSystemLoadBy

public void increaseSystemLoadBy(FakeLoad load)
                          throws MaximumLoadExceededException

Throws:

MaximumLoadExceededException

decreaseSystemLoadBy

public void decreaseSystemLoadBy(FakeLoad load)

getCpuSimulators

public List<CpuSimulator> getCpuSimulators()

getMemorySimulator

public MemorySimulator getMemorySimulator()

getDiskInputSimulator

public DiskInputSimulator getDiskInputSimulator()

getDiskOutputSimulator

public DiskOutputSimulator getDiskOutputSimulator()