org.javades.jqueues.r5.entity.jq.queue.nonpreemptive

Class SJF<J extends SimJob,Q extends SJF>

java.lang.Object

org.javades.jqueues.r5.entity.AbstractSimEntity

org.javades.jqueues.r5.entity.jq.AbstractSimJQ<J,Q>

org.javades.jqueues.r5.entity.jq.queue.AbstractSimQueue<J,Q>

org.javades.jqueues.r5.entity.jq.queue.AbstractClassicSimQueue<J,Q>

org.javades.jqueues.r5.entity.jq.queue.nonpreemptive.AbstractNonPreemptiveWorkConservingSimQueue<J,Q>

org.javades.jqueues.r5.entity.jq.queue.nonpreemptive.SJF<J,Q>

Type Parameters:

J - The type of SimJobs supported.

Q - The type of SimQueues supported.

All Implemented Interfaces:

SimQueue<J,Q>, SimQoS<J,Q>, SimEntity, org.javades.jsimulation.r5.SimEventListResetListener

public class SJF<J extends SimJob,Q extends SJF>
extends AbstractNonPreemptiveWorkConservingSimQueue<J,Q>
implements SimQoS<J,Q>

The SJF queue serves jobs one at a time in order of ascending requested service times.

Shortest-Job First.

In case of ties, jobs are scheduled for service in order of arrival.

Author:

Jan de Jongh, TNO

Copyright (C) 2005-2017 Jan de Jongh, TNO

This file is covered by the LICENSE file in the root of this project.

See Also:

SimJob.getServiceTime(Q), LJF

Nested Class Summary

Nested classes/interfaces inherited from class org.javades.jqueues.r5.entity.AbstractSimEntity

AbstractSimEntity.Notifier, AbstractSimEntity.PreNotificationHook

Nested classes/interfaces inherited from interface org.javades.jqueues.r5.entity.jq.queue.SimQueue

SimQueue.AutoRevocationPolicy

Nested classes/interfaces inherited from interface org.javades.jqueues.r5.entity.SimEntity

SimEntity.Action, SimEntity.UnknownNotificationTypePolicy, SimEntity.UnknownOperationPolicy

Field Summary

Fields inherited from class org.javades.jqueues.r5.entity.jq.queue.AbstractSimQueue

eventsScheduled, SANITY

Fields inherited from class org.javades.jqueues.r5.entity.AbstractSimEntity

USE_ARRAY_OPTIMIZATION

Constructor Summary

Constructors

Constructor and Description
SJF(org.javades.jsimulation.r5.SimEventList eventList) Creates a SJF queue given an event list.

Method Summary

Modifier and Type	Method and Description
SJF<J,Q>	getCopySimQueue() Returns a new SJF object on the same SimEventList.
Object	getQoS() Calls super method (in order to make implementation final).
Class	getQoSClass() Calls super method (in order to make implementation final).
protected double	getServiceTimeForJob(J job) Calls super method (in order to make implementation final).
protected void	insertJobInQueueUponArrival(J job, double time) Inserts the job in the internal SJF job queue maintaining non-decreasing service-time ordering.
protected void	removeJobFromQueueUponExit(J exitingJob, double time) Calls super method and removes the job (if present) from the internal SJF queue.
protected void	resetEntitySubClass() Calls super method and clears the internal SJF queue.
protected J	selectJobToDropAtFullQueue(J arrivingJob, double time) Throws an exception.
protected J	selectJobToStart() Returns the first job in (and removes it from) the internal SJF queue.
String	toStringDefault() Returns "SJF".

Methods inherited from class org.javades.jqueues.r5.entity.jq.queue.nonpreemptive.AbstractNonPreemptiveWorkConservingSimQueue

hasServerAvailable, insertJobInQueueUponStart, isStartArmed, queueAccessVacationDropSubClass, removeJobFromQueueUponDeparture, removeJobFromQueueUponDrop, removeJobFromQueueUponRevokation, reschedule, rescheduleAfterArrival, rescheduleAfterDeparture, rescheduleAfterDrop, rescheduleAfterRevokation, rescheduleAfterStart, rescheduleForNewServerAccessCredits, setServerAccessCreditsSubClass

Methods inherited from class org.javades.jqueues.r5.entity.jq.queue.AbstractClassicSimQueue

getBufferSize, getNumberOfServers

Methods inherited from class org.javades.jqueues.r5.entity.jq.queue.AbstractSimQueue

arrive, autoRevoke, cancelDepartureEvent, cancelDepartureEvent, depart, departureFromEventList, drop, getAutoRevocationPolicy, getDepartureEvents, getDepartureEvents, getFirstJob, getFirstJobInServiceArea, getFirstJobInWaitingArea, getJobs, getJobsInServiceArea, getJobsInWaitingArea, getNumberOfJobs, getNumberOfJobsInServiceArea, getNumberOfJobsInWaitingArea, getServerAccessCredits, hasJobs, hasJobsInServiceArea, hasJobsInWaitingArea, hasServerAcccessCredits, isJob, isJobInServiceArea, isJobInWaitingArea, isQueueAccessVacation, registerStdOutSimQueueListener, revoke, revoke, scheduleDepartureEvent, scheduleJobArrival, setAutoRevocationPolicy, setQueueAccessVacation, setServerAccessCredits, start, takeServerAccessCredit, triggerPotentialNewStartArmed, unregisterStdOutSimQueueListener

Methods inherited from class org.javades.jqueues.r5.entity.AbstractSimEntity

addPendingNotification, addPendingNotification, clearAndUnlockPendingNotificationsIfLocked, delegateOperation, doAfterNotifications, doOperation, fireAndLockPendingNotifications, getEventList, getLastUpdateTime, getRegisteredDelegatedOperations, getRegisteredNotificationTypes, getRegisteredOperations, getSimEntityListeners, getUnknownNotificationTypePolicy, getUnknownOperationPolicy, isIgnoreEventListReset, notifyEventListReset, registerDelegatedOperation, registerNotificationType, registerOperation, registerPreEventHook, registerPreNotificationHook, registerPreUpdateHook, registerSimEntityListener, registerStdOutSimEntityListener, removeDelegationForOperation, resetEntity, setIgnoreEventListReset, setName, setUnknownNotificationTypePolicy, setUnknownOperationPolicy, toString, unregisterSimEntityListener, unregisterStdOutSimEntityListener, update

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.javades.jqueues.r5.entity.jq.queue.SimQueue

arrive, getAutoRevocationPolicy, getJobs, getJobsInServiceArea, getJobsInWaitingArea, getNumberOfJobs, getNumberOfJobsInServiceArea, getNumberOfJobsInWaitingArea, getServerAccessCredits, isJob, isJobInServiceArea, isJobInWaitingArea, isQueueAccessVacation, revoke, revoke, setAutoRevocationPolicy, setQueueAccessVacation, setServerAccessCredits

Methods inherited from interface org.javades.jqueues.r5.entity.SimEntity

doAfterNotifications, doOperation, getEventList, getLastUpdateTime, getRegisteredNotificationTypes, getRegisteredOperations, getSimEntityListeners, getUnknownNotificationTypePolicy, getUnknownOperationPolicy, isIgnoreEventListReset, registerSimEntityListener, resetEntity, setIgnoreEventListReset, setName, setUnknownNotificationTypePolicy, setUnknownOperationPolicy, unregisterSimEntityListener, update

Methods inherited from interface org.javades.jsimulation.r5.SimEventListResetListener

notifyEventListReset

Constructor Detail

SJF

public SJF(org.javades.jsimulation.r5.SimEventList eventList)

Creates a SJF queue given an event list.

Parameters:

eventList - The event list to use.

Method Detail

getCopySimQueue

public SJF<J,Q> getCopySimQueue()

Returns a new SJF object on the same SimEventList.

Specified by:

getCopySimQueue in interface SimQueue<J extends SimJob,Q extends SJF>

Returns:

A new SJF object on the same SimEventList.

See Also:

AbstractSimEntity.getEventList()

toStringDefault

public String toStringDefault()

Returns "SJF".

Specified by:

toStringDefault in interface SimEntity

Overrides:

toStringDefault in class AbstractSimQueue<J extends SimJob,Q extends SJF>

Returns:

"SJF".

See Also:

SimEntity.setName(java.lang.String), Object.toString()

getQoSClass

public final Class getQoSClass()

Calls super method (in order to make implementation final).

Specified by:

getQoSClass in interface SimQoS<J extends SimJob,Q extends SJF>

Returns:

The Java class used for QoS behavior, may be null.

getQoS

public final Object getQoS()

Calls super method (in order to make implementation final).

Specified by:

getQoS in interface SimQoS<J extends SimJob,Q extends SJF>

Returns:

The QoS value, may be null.

resetEntitySubClass

protected final void resetEntitySubClass()

Calls super method and clears the internal SJF queue.

Overrides:

resetEntitySubClass in class AbstractNonPreemptiveWorkConservingSimQueue<J extends SimJob,Q extends SJF>

See Also:

AbstractNonPreemptiveWorkConservingSimQueue.insertJobInQueueUponArrival(J, double)

insertJobInQueueUponArrival

protected final void insertJobInQueueUponArrival(J job,
                                                 double time)

Inserts the job in the internal SJF job queue maintaining non-decreasing service-time ordering.

In case of ties, jobs are scheduled for service in order of arrival from the underlying event list.

Overrides:

insertJobInQueueUponArrival in class AbstractNonPreemptiveWorkConservingSimQueue<J extends SimJob,Q extends SJF>

Parameters:

job - The job that arrived.

time - The current time (i.e., arrival time of the job).

See Also:

getServiceTimeForJob(J)

selectJobToDropAtFullQueue

protected final J selectJobToDropAtFullQueue(J arrivingJob,
                                             double time)

Throws an exception.

Overrides:

selectJobToDropAtFullQueue in class AbstractNonPreemptiveWorkConservingSimQueue<J extends SimJob,Q extends SJF>

Parameters:

arrivingJob - The arriving job.

time - The arrival time.

Returns:

This method does not return.

Throws:

IllegalStateException - As invocation of this method is unexpected (buffer cannot be full).

See Also:

AbstractNonPreemptiveWorkConservingSimQueue.insertJobInQueueUponArrival(J, double)

selectJobToStart

protected final J selectJobToStart()

Returns the first job in (and removes it from) the internal SJF queue.

Specified by:

selectJobToStart in class AbstractNonPreemptiveWorkConservingSimQueue<J extends SimJob,Q extends SJF>

Returns:

The first job in the internal SJF queue.

See Also:

AbstractNonPreemptiveWorkConservingSimQueue.insertJobInQueueUponArrival(J, double), AbstractNonPreemptiveWorkConservingSimQueue.reschedule(double)

getServiceTimeForJob

protected final double getServiceTimeForJob(J job)

Calls super method (in order to make implementation final).

Overrides:

getServiceTimeForJob in class AbstractSimQueue<J extends SimJob,Q extends SJF>

Parameters:

job - The job, non-null.

Returns:

The result from the super method.

removeJobFromQueueUponExit

protected final void removeJobFromQueueUponExit(J exitingJob,
                                                double time)

Calls super method and removes the job (if present) from the internal SJF queue.

Overrides:

removeJobFromQueueUponExit in class AbstractNonPreemptiveWorkConservingSimQueue<J extends SimJob,Q extends SJF>

Parameters:

exitingJob - The jobs that ends its visit, non-null.

time - The current time, i.e., the time the job ends its visit.

See Also:

AbstractNonPreemptiveWorkConservingSimQueue.removeJobFromQueueUponDrop(J, double), AbstractNonPreemptiveWorkConservingSimQueue.removeJobFromQueueUponRevokation(J, double, boolean), AbstractNonPreemptiveWorkConservingSimQueue.removeJobFromQueueUponDeparture(J, double)