Simjava examples

• app_omega - A simple omega switching network (also shows use of JAR files)
• app_cache - A simple memory cache
• app_task_farm - A work farm
• app_tdiag - A timing diagram demo.
• app_graph - A graph demo.
• app_textarea - An example overlaying text areas onto the animation area.

• example1 - A very simple example with the basic functions, and ports
• example2 - The first example extended with some stats stuff
• example3 - Data passing between entities using messages
• example4 - Event selection predicates and the deferred event queue
• DEMOS - A Discrete Event Modelling On Simula style resource

Notes on running examples

make
make run

Appletviewer, browsers and jars

When running an applet from a browser, it looks for class files in the codebase directory specified in the .html file, or in the directory with the html file.

It is appealing to archive all .class and bitmap files into an archive, or JAR, as this cuts down on network transfer time. However, when developing simulations it is more convenient to access the .classes normally, since there are then no security restrictions preventing writing of files - for some reason these restrictions seem to apply even to code in locally generated Jar files. For this reason, two .html files are given in each applet example; index.html for use by appletviewer, and jarindex.html for use by a web browser. The following html clips show various ways of including a simulation in a web page.

• Accessing all .class files from CLASSPATH available to appletviewer (zero security checks, user and simjava code can write files):-

      <applet code=workfarm.Applet5.class 
      width=500 height=420></applet>
    

• Accessing simjava packages from a jar file, the user's simulation from the code directory (simjava can't write files, user code can):-

      <applet archive = "../../jars/simjava.jar" 
            code=Applet4.class width=500 height=420>
      </applet>
    

• Accessing both user simulation code and simjava packages from JAR files (paranoid security checks, nothing can write files)

      <applet code=workfarm.GraphTest.class 
           codebase="../.."
           archive="jars/graphtest.jar, jars/simjava.jar" 
           width=500 height=420></applet>
    

Browsers and JDK 1.1

HotJava can be used to run JDK 1.1 applets (and the links above have been tested with this). It is best to use jar files with HotJava - HotJava has problems loading class flies directly from two different locations (i.e. the example directory plus the simjava directory). The jarindex.html files provide the jars.