Home Java • Download Jess in Action: Java Rule-Based Systems by Ernest Friedman-Hill PDF

Download Jess in Action: Java Rule-Based Systems by Ernest Friedman-Hill PDF

By Ernest Friedman-Hill

Jess is a ideas engine with first-class Java interaction. "Jess in motion" is a quick and quick learn. really utilizing Jess is unusually tough.

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 proof, calling Jess from Java) and intensely wide examples with very specified backgrounds.

All for model 61p4. the present Jess model is 71p2. As an advantage it is easy to obtain from the books site a nonprofit model of Jess and not using a deadline. regrettably: Jess isn't open resource.

If you must do a little Jess, "Jess in motion" is a superb supplement for the net documentation.

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Additional resources for Jess in Action: Java Rule-Based Systems

Example text

The solution to Mrs. Rosencrantz’s problem involved lots of pattern matching and no procedural code at all (except to print a report at the end). Often the pattern-matching technique used by a particular rule engine will affect the kinds of rules you write for that engine, either by limiting the possibilities or by encouraging you to write rules that would be particularly efficient. 5 The agenda Once your inference engine figures out which rules should be fired, it still must decide which rule to fire first.

As in all programming, this process involves a significant amount of art; there are always multiple ways to accomplish a task. The good news is that because each rule can be independent of the others, rule-based programs can be developed iteratively: code a little, test a little, and then code some more. The bad news is that it’s relatively easy to write unstructured rule-based programs, which can become hard to understand. 4 K. : Addison-Wesley), 2000. 26 CHAPTER 2 What are rule-based systems?

Such systems have become common not only in manufacturing but in the mail-order and Internet sales industry, where rule-based systems help to recommend related products, 1 D. O’Connor and V. Barker, “Expert Systems for Configuration at Digital: XCON and Beyond,” Communications of the ACM 32, no. 3 (1989). Some real-world examples 11 optimize packaging, and perform other routine order-configuration tasks. Part VI of this book describes a series of web-enabled systems for order configuration built around the Jess rule engine using Java servlets and JavaServer pages.

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