- VERSION 1.2 (beta release - August 1997) -

What is simjava?

The basic idea is a collection of entities each of which runs in its own thread. These entities are connected together by ports and can communicate with each other by sending and receiving event objects. A central system class controls all the threads, advances the simulation time, and delivers the events. The progress of the simulation is recorded through trace messages produced by the entities, and saved in a file.

A simulation layout

What's new in version 1.2?

• Added "simdiag" package for timing diagrams. This is a collection of javabeans for displaying results.
• Included option to bundle class and bitmap files into a "jar" Java archive, to cut down on startup time across the net.
• Changed animation mechanism. In version 1.1 the entire simulation ran to completion, then the trace file was read in and animated. In version 1.2 the simulation is run in lockstep with the animation. This allows the simulation model to be altered on the fly.

(NB These all use release 1.1 of Java, and will not work under browsers which only support Java version 1.0.2. HotJava1.0 currently supports JDK1.1, and the next releases of Explorer and Netscape claim to, but these applets have only been tested using Sun's JDK1.1.3 and HotJava1.0 on Solaris. Additionnally, it appears that some older version of Netscape may fail to load images correctly where Mozilla browser do not.)

• Omega Network - An omega switching network.
• Timing Diagram - A timing diagram generated on the fly.
• A complete list of examples.

Download simjava

• simjava home page

Documentation

• Writing simulations using the library.
• Using the applet animation facilities.
• A guide to simdiag.
• The design of the simjava packages.

• The simjava package.
• The simanim package.
• The simdiag package.

Directory structure

simjava-1.2/
  index.html		-- This file
  classes/		-- The .class files
  eduni/		-- The source code
    simjava/*.java
    simanim/*.java
    simdiag/*.java
  doc/	                -- Documentation
    design_doc/
    ref/		-- javadoc generated detailed docs
    simjava_guide/	-- User guides
    simdiag_guide/	
    simanim_guide/  
  jars/			-- jar archives
  examples/		-- Examples, see README.txt for details

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