Clips / Java/ JNI / Threads

[Blake McBride]

Greetings,

I would like to use CLISP from Java (presumably through JNI).  My question has to do with threads.

My Java program is a web application.  Many users can use the system at the same time - multiple threads.  This leads me to two questions regarding my use of CLIPS.

1.  Will it work in a multi-threading environment?

2.  In other systems I have used (JESS), I was able to define a base set of rules and facts.  Each new thread would start with this base set.  After that, each thread can diverge with regard to rules and facts.  Can I do this through the JNI interface?

Thank you!

Blake McBride

[Ryan Johnston]

1. CLIPS environments are not thread safe, so only execute one operation on a single CLIPS environment at a time.

2. This can be accomplished by using multiple CLIPS environments, one per thread. You could even create a pool of "unused" environments ahead of time, setting up your rules and facts, and then taking an environment from that pool of resources when you need it.

I'm not familiar with jmi, but there are examples in the source code here that might help: https://sourceforge.net/p/clipsrules/code/HEAD/tree/branches/64x/clipsjni/java-src/net/sf/clipsrules/jni/examples/

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[CLIPS Support]

The CLIPSJNI example you want to look at is RouterDemo. It creates two environments and runs each one  in separate panes of the GUI. Each environment you create needs to have rules loaded after it is created, but it is completely separate from other environments, so the rules and facts can be different.