Drools Training Overview
Drools is an open-source Business Rules Management Software (BRMS) written in Java. This Drools Business Rule Management System training course teaches attendees how to write, refine, and deploy Drools rules.
Location and Pricing
This course is taught as a private, live online class for teams of 3 or more. All our courses are hands-on, instructor-led, and tailored to fit your group’s goals and needs. Most Accelebrate classes can be flexibly scheduled for your group, including delivery in half-day segments across a week or set of weeks. To receive a customized proposal and price quote for online corporate training, please contact us.
In addition, some courses are available as live, instructor-led training from one of our partners.
Objectives
- Understand what Drools is
- Understand Rules and the Rule Engine
- Work with the components in Drools
- Understand the architecture of Drools
- Write Drools code with real-time use cases
- Understand Stateful Vs Stateless sessions
- Understand the Drools language syntax
Prerequisites
All students must have basic Java programming.
Outline
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Drools Introduction
- What is a Rule-Based Engine?
- Advantages of the rule engine
- When not to use rule engine?
- What is Drools?
- Environment setup
- First Drool program
- Creating Drools project with Eclipse Plugin
- Creating Rules-Based Maven Project from scratch
Drools Rules
- Rules basic structure
- Rules writing
- Rules syntax
- Left-Hand Side (When) syntax
- The Right-Hand side (then)
- Declarative approach
- Imperative versus Declarative implementation
- Rules execution chaining
- Atomicity of rules
- Ordering of rules
- Rule execution life cycle
- Complex Rule and multiple Rule
- Timers and Calendars
- Defining our rules and facts
- Translating rules into Drools Rule Language
- Selecting proper facts
- Basic operations and Drools specific operators
- Basic accumulate functions (sum, max, etc.)
- Intermediate calculations
- Inserting new facts
- Ordering rules
- Backward chaining
- Working with facts
- Manipulating facts in code
- Manipulating facts in rules
Drools Runtime
- KieModel and KieContainer
- KieModel configuration (KieBases, KieSession, and stateless KieSession)
- Stateless Knowledge Session
- Stateful knowledge Session
Improving Rule Syntax
- Modifying the data in the working memory
- The insert keyword
- The modify and update keywords
- The delete/retract keywords
- Rule Attributes
- Controlling which rule will execute
- Splitting rule groups with agenda group
- Other rule groups
- Rule dates management
- Special Drools operations
- Boolean and numeric operations
- Regex operations
- Collections (contains, memberOf)
Understanding KIE Sessions in Detail
- Stateless and stateful Kie Sessions
- Kie Runtime components
- Globals
- Way to parameterize the condition of a pattern
- Way to improve new information in a session in LHS
- Way to collect information from a session
- Kie Base components
- Functions
- Custom operators
- Custom accumulates functions
Conclusion
Training Materials
All Drool attendees receive comprehensive courseware.
Software Requirements
- A recent version of Windows, macOS, or Linux with at least 8 GB RAM
- JDK 8 or later
- The Java tool the students are likely to use after the class (Eclipse or IntelliJ IDEA are recommended)
- Other free software - please contact us if you have purchased this class
