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jqueues

Discrete-Event Simulation of Queueing Systems in Java

License

License
GroupId

GroupId

org.javades
ArtifactId

ArtifactId

jqueues
Last Version

Last Version

5.2.0
Release Date

Release Date
Type

Type

jar
Description

Description

jqueues
Discrete-Event Simulation of Queueing Systems in Java
Project URL

Project URL

https://github.com/jandejongh/jqueues
Source Code Management

Source Code Management

https://github.com/jandejongh/jqueues

Download jqueues

Filename Size
jqueues-5.2.0.pom
jqueues-5.2.0.jar 647 KB
jqueues-5.2.0-sources.jar 592 KB
jqueues-5.2.0-javadoc.jar 2 MB
Browse

How to add to project

<!-- https://jarcasting.com/artifacts/org.javades/jqueues/ -->
<dependency>
    <groupId>org.javades</groupId>
    <artifactId>jqueues</artifactId>
    <version>5.2.0</version>
</dependency>
// https://jarcasting.com/artifacts/org.javades/jqueues/
implementation 'org.javades:jqueues:5.2.0'
// https://jarcasting.com/artifacts/org.javades/jqueues/
implementation ("org.javades:jqueues:5.2.0")
'org.javades:jqueues:jar:5.2.0'
<dependency org="org.javades" name="jqueues" rev="5.2.0">
  <artifact name="jqueues" type="jar" />
</dependency>
@Grapes(
@Grab(group='org.javades', module='jqueues', version='5.2.0')
)
libraryDependencies += "org.javades" % "jqueues" % "5.2.0"
[org.javades/jqueues "5.2.0"]

Dependencies

compile (1)

Group / Artifact Type Version
org.javades : jsimulation jar 5.2.0

test (1)

Group / Artifact Type Version
junit : junit jar 4.11

Project Modules

There are no modules declared in this project.

jqueues

Discrete-Even Simulation of Queueing Systems in Java

Java implementation of discrete-event simulation of queueing systems, loosely modeled after Graham Birtwistle's DEMOS (Discrete Event Modelling on SIMULA), see e.g., http://staffwww.dcs.shef.ac.uk/people/G.Birtwistle/research/demos.pdf.

Unlike DEMOS, which also includes support for (e.g.) random-number generation, statistics and reporting, jqueues exclusively focusses on the simulation of queueing systems. For instance, hooks for statistics are present, obviously, but you'll need a statistics package for (sophisticated) statistical analysis.

On the other hand, compared to DEMOS, jqueues has a somewhat larger collection of well-known queueing systems, and supports the notion of composite queues in which queueing systems are constructed by "combining" other queueing systems (e.g., by putting them in tandem).

Features

The software features a wide range of both well-known as well as hardly known queueing systems, like FCFS, FCFS_B (limited buffer), FCFS_c (multiple servers), LCFS (PR), Infinite Server, Random, PS, SJF, SRTF, Wait-Until-Relieved, GATE, LeakyBucket, ALIMIT (arrival-rate limiter), Social PS, Catch-Up PS, etc. All queues support job revocations.

It also features generic composite queueing systems like Tandem, FeedBack and Jackson queues. In a composite queue, the sub-queues and their interconnections are effectively hidden; instead, a single queueing system is presented. Composite queueing systems can be nested arbitrarily deep.

With the (composite) CTandem2 queue, you can even connect the "waiting area" of one queue with the "service area" of another. This allows for many other queueing systems like Multi-Server Shortest-Job First through SJF_c = CTandem2[SJF, FCFS_c].

A special class of composite queues named "encapsulators" operate on a single queueing system. An encapsulator is able to modify specific aspects of the (sub)queue's behavior, like hiding the start of jobs, or limiting the waiting time of jobs (jobs that must wait beyond a given threshold are automatically dropped).

The software comes with many abstract base classes for queueing systems, allowing for smooth realization of new queueing systems.

What is does NOT do

The software does NOT come with (sophisticated) random-number generation and statistics; there are excellent Java libraries for that. Also, it hardly supports GUI operation. Note that these missing features are NOT on the wishlist/roadmap for jqueues.

Dependencies

The project depends on jsimulation (https://github.com/jandejongh/jsimulation).

Documentation

Both jsimulation and jqueues have extensive javadoc comments; a 'Guided Tour' is on its way; see https://github.com/jandejongh/jqueues-guided-tour.

License

Apache v2.0.

Versions

Version
5.2.0