seda.sandStorm.internal
Class ResponseTimeController

java.lang.Object
  |
  +--seda.sandStorm.internal.ResponseTimeController

All Implemented Interfaces:

ResponseTimeControllerIF

Direct Known Subclasses:

ResponseTimeControllerDirect, ResponseTimeControllerMM1, ResponseTimeControllerPID

public abstract class ResponseTimeController

extends java.lang.Object

implements ResponseTimeControllerIF

The ResponseTimeController attempts to keep the response time of a given stage below a given target by adjusting admission control parameters for a stage.

Author:

Matt Welsh

Field Summary

protected static int	INIT_THRESHOLD
protected static int	MAX_THRESHOLD
protected static int	MIN_THRESHOLD
protected EnqueuePredicateIF	pred
protected StageWrapperIF	stage
protected double	targetRT

Constructor Summary

protected

ResponseTimeController(ManagerIF mgr, StageWrapperIF stage)

Method Summary

abstract void	adjustThreshold(QueueElementIF[] fetched, long serviceTime) Invoked by the stage's thread manager to adjust admission control parameters.
abstract void	disable() Disable the response time controller.
abstract void	enable() Enable the response time controller.
double	getTarget() Return the response time target.
void	setTarget(double target) Set the response time target in milliseconds.

Methods inherited from class java.lang.Object

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

Field Detail

INIT_THRESHOLD

protected static final int INIT_THRESHOLD

MIN_THRESHOLD

protected static final int MIN_THRESHOLD

MAX_THRESHOLD

protected static final int MAX_THRESHOLD

stage

protected StageWrapperIF stage

pred

protected EnqueuePredicateIF pred

targetRT

protected double targetRT

Constructor Detail

ResponseTimeController

protected ResponseTimeController(ManagerIF mgr,
                                 StageWrapperIF stage)
                          throws java.lang.IllegalArgumentException

Method Detail

setTarget

public void setTarget(double target)

Description copied from interface: ResponseTimeControllerIF

Set the response time target in milliseconds.

Specified by:

setTarget in interface ResponseTimeControllerIF

getTarget

public double getTarget()

Description copied from interface: ResponseTimeControllerIF

Return the response time target.

Specified by:

getTarget in interface ResponseTimeControllerIF

adjustThreshold

public abstract void adjustThreshold(QueueElementIF[] fetched,
                                     long serviceTime)

Description copied from interface: ResponseTimeControllerIF

Invoked by the stage's thread manager to adjust admission control parameters.

Specified by:

adjustThreshold in interface ResponseTimeControllerIF

enable

public abstract void enable()

Description copied from interface: ResponseTimeControllerIF

Enable the response time controller.

Specified by:

enable in interface ResponseTimeControllerIF

disable

public abstract void disable()

Description copied from interface: ResponseTimeControllerIF

Disable the response time controller.

Specified by:

disable in interface ResponseTimeControllerIF