By Ernest Friedman-Hill
Jess is a principles engine with very good Java interaction. "Jess in motion" is a quick and fast learn. truly utilizing Jess is unusually tricky.
In "Jess in Action", you are going to examine the Jess syntax (facts and rules), the way it interplays with Java (scripting Java from Jess, Java Beans as shadow evidence, calling Jess from Java) and extremely vast examples with very specific backgrounds.
All for model 61p4. the present Jess model is 71p2. As an advantage one could obtain from the books web site a nonprofit model of Jess with out a closing date. regrettably: Jess isn't really open resource.
If you must do a little Jess, "Jess in motion" is a superb supplement for the web documentation.
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Additional info for Jess in Action: Java Rule-Based Systems
4 Interface building For most rule-based systems to do any useful work, they need to be connected in some way to their environment. Sometimes this means database access; other times it means directly reading values from sensors and sending commands to embedded hardware. Before you begin to code your rules, you try to develop a picture of what your system will need to realize these connections. Depending on your development environment, your rules may already have a built-in ability to connect to all the data sources and sinks they’ll need to reach, directly from the rule language.
Rules are a lot like the if-then statements of traditional programming languages. You might write a gum-chewing rule like this, in an English-like pseudocode: IF I am in school AND I am chewing gum THEN spit out the gum END The if part of a rule written in this form is often called its left-hand side (often abbreviated LHS), predicate, or premises; and the then part is the right hand side (RHS), actions, or conclusions. The domain of a rule is the set of all information the rule could possibly work with.
The rule engine is often embedded in a network-based server so that it can be accessible across an enterprise. This enterprise-level use of a rule engine is probably the fastest growing and most visible market for rule-based systems programming today. Some application servers, like BEA’s WebLogic, include integrated rule engines. Other vendors like ILOG sell rule engines meant to be used with third-party servers. There are literally 12 CHAPTER 1 Rules to the rescue dozens of rule engines to choose from, targeted toward this product niche.