O'Reilly European Open Source Convention - 17-20 October, 2005

Session
Drools: An Open Source Java Rules Engine
Brian Sam-Bodden, Integrallis Software, LLC

Track: Java
Date: Tuesday, 18 October 2005
Time: 16:00 - 16:45
Location: Foyer Room
Software development is expensive when business rules are hard-coded in your application's source code, changes and additions to those rules translate to wasted time and money. Good object-oriented, component-based approaches can alleviate the burden of keeping up with changes in the business world, but they still require that expert knowledge of the changes be passed from the decision makers to the business analysts and finally to programmers that need to implement these changes. Business Rule Engines and Business Rule Languages are based on the basic premise of separation of concerns by empowering business domain experts to express the rules of business in a way that it is directly usable by applications.
Drools is an open source pure-Java implementation of a forward chaining rules engine. Drools can be used in a J2SE or J2EE application and allows you to express rules in a variety of scripting languages, including Python, Groovy, and Java.
Learn how Business Rules with Drools can make your Java applications more flexible and robust.
In this session you will learn:

Overview of Rule Engine Technology
Why and when to use a Rule Engine
Overview of Drools
Drools in a J2SE application
Refactoring an application to use Drools
Writing a DRL file
Dealing with Conflict Resolution: Rule Salience
Drools Event Model
Drools in a J2EE application
Rule loading strategies
Rule management
Tips and Tricks

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