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Drools Business Rule Management System

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...

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Course Code JAV-418
Duration 3 days
Available Formats Classroom

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.

Skills Gained

  • 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.

Course Details

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

Outline

  • 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