By Ernest Friedman-Hill
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Additional resources for Jess in Action: Java Rule-Based Systems (In Action series)
Let’s give it a try. c1)) 8 CHAPTER 1 Rules to the rescue and then run it, you get the following result: Fred 3 orange Joe 4 blue Bob 1 plaid Tom 2 red Fred 2 orange Joe 4 blue Bob 1 plaid Tom 3 red Fred 2 orange Joe 1 blue Bob 4 plaid Tom 3 red Fred 1 orange Joe 2 blue Bob 4 plaid Tom 3 red Fred 1 orange Joe 3 blue Bob 4 plaid Tom 2 red Fred 1 orange Joe 4 blue Bob 3 plaid Tom 2 red Now there are six different solutions, and Jess finds and reports them all. This is another strength of rule-based programming: Rule-based systems can degrade gracefully in the presence of incomplete information.
In a classical production system such as MYCIN, rules could do nothing but add, remove, and modify facts in the working memory. In modern rule engines, firing a rule can have a wide range of effects. Some modern rule engines (like Jess) offer a complete programming language you can use to define what happens when a given rule fires. The execution engine then represents the environment in which this programming language executes. For some systems, the execution engine is a language interpreter; for others, it is a dispatcher that invokes compiled code.
It’s also worthwhile to have another knowledge engineer look over your work at this point. Code reviews are amazingly effective at finding problems with software before a release, and they work for rule-based software as well. Whether you hold formal code reviews or just ask a friend for advice, a second pair of eyes can really help to increase the quality of your work. 5 Rule engine standards Various commercial off-the-shelf products (other than application servers) can be designed to work together with rule engines.