Sorry Earnest but I'm being dumb. 1) Multiple users(threads) use the same Rete object?
2) Would you kindly expand on "....The only thing to remember is that per-session facts should include a slot with a session identifier, so logical processes from separate sessions stay separate". I think I am missing something important here !! Thanks Ron -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, September 10, 2002 1:15 PM To: [EMAIL PROTECTED] Subject: Re: JESS: Jess-Servlet Architecture It's been a long time since I looked at Ralph's code so I don't even remember how he did things; I can't therefore say if it's a good way or not. If you want to ask specific questions about it I can try to answer them. Jess is very malleable, so pretty much any architecture you can come up with can be made to work. The Servlet part of the Jess Book presents an architecture where a single Rete object is shared by all the servlets and JSPs in and entire Web application. They all assert facts at will and call run() when necessary to process data. In general, this works well. Sometimes one servlet calls run() and no rules fire, because another servlet called run() in the previous instant -- this is OK. You just have to avoid writing rules such that the wrong thing will happen if run() is called before some "set" of facts is completely asserted. In the book, queries are used to extract results, but you could use store and fetch or explicit callbacks. The only thing to remember is that per-session facts should include a slot with a session identifier, so logical processes from separate sessions stay separate. I think Ron Day wrote: > In searching the Jess Archives, the only example of using Jess with Servlets > is the ""Ralph Grove Reptile Identification Helper". Since this was done > some time ago I ask the following: > > 1) Is this still an efficient architecture for Jess with Servlets ? > 2) Anyone have a better (more recent) reference for Jess/Servlet > architectures ? > > I don't think my project can wait for the "JESS book" to be published. > > Any help greatly appreciated > > Ron > --------------------------------------------------------- Ernest Friedman-Hill Distributed Systems Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 Org. 8920, MS 9012 [EMAIL PROTECTED] PO Box 969 http://herzberg.ca.sandia.gov Livermore, CA 94550 -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] -------------------------------------------------------------------- -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
