Master Drools Programming – Learn How to Write Drools Rules

Course Curriculum

Chapter 1: 1. Introduction

Lecture 1: Introduction to the course

Lecture 2: What is a Rule Engine?

Lecture 3: How to Design Rules and When (not) to Use Drools

Lecture 4: Introduction to Drools Language Syntax

Chapter 2: 2. Example Code and Running it Locally

Lecture 1: Structure of Example Code

Lecture 2: Get example code running with IntelliJ IDEA Community Edition

Lecture 3: Get example code running with Eclipse

Lecture 4: Get example code running with Visual Studio Code (VS Code)

Chapter 3: 3. Stateless Sessions

Lecture 1: Stateless use cases

Lecture 2: Step1: First two rules to validate passports

Lecture 3: Step2: Split a rule

Lecture 4: Step3: Bind a variable

Lecture 5: Step4: Using the bound variable

Lecture 6: Steps 5 and 6: Avoid repetitions

Lecture 7: Stateless Sessions Summary

Chapter 4: 4. Stateful Sessions

Lecture 1: Introduction to Stateful Sessions

Lecture 2: Step1: Modify the Object in the Middle of Session

Lecture 3: Step2: Inference

Lecture 4: Stateful Sessions Summary

Chapter 5: 5. Cross Products – Drools Version of SQL JOIN

Lecture 1: Introduction to Cross Products

Lecture 2: Step1: Join Visa Application to a Passport

Lecture 3: Fixed a bug in the upcoming lecture

Lecture 4: Step2: Is the Passport Valid 6 Months After Trip?

Lecture 5: Step3: Check that the property is not already with the given value

Lecture 6: Pattern Matching and Cross Products Summary

Chapter 6: Insert new facts and determine the execution order

Lecture 1: Intro to Adding New Facts & Setting Execution Order

Lecture 2: Rule Dialect Change

Lecture 3: Note about upcoming Step

Lecture 4: Step1: Create a New Fact and Insert it into the Session

Lecture 5: Step2: Control execution order with salience

Lecture 6: Step3: Control execution order with agenda groups

Lecture 7: Step4: Use agenda groups with salience

Lecture 8: Step5: Run a single rule from an activation group

Lecture 9: Bonus Step! Step 6. Set Focus to Agenda Group In Drools Rule.

Lecture 10: Summary of Adding Facts and Setting Execution Order

Chapter 7: Insert a fact logically and check that the fact does not exist

Lecture 1: Introduction to Logical Insertion of Facts and Checking the Fact Does Not Exist

Lecture 2: Step1: Add Fact Using insertLogical()

Lecture 3: Using the optional "this" keyword on the left-hand-side of MVEL rules

Lecture 4: Step2: Create fact objects and check that fact does not exist

Lecture 5: Step3: Replace Changing of the Objects with Fact Objects

Lecture 6: Step4: Reduce the Number of Rules Needed by Eliminating Positive Cases

Lecture 7: Section Summary

Chapter 8: 8. Exists and Forall Conditional Elements

Lecture 1: Intro to working with groups of objects

Lecture 2: Step1: Rewrite visa application logic to support FamilyVisaApplications

Lecture 3: Step2: Exists keyword introduced

Lecture 4: Step3: Use forall to match a group of objects

Lecture 5: Step4: Use forall to extract objects from a group based on min/max value

Lecture 6: Step5: Forall with only one expression

Lecture 7: Summary of Working with Groups of Facts

Chapter 9: 9. Spreadsheet Decision Tables

Lecture 1: Spreadsheet decision tables intro

Lecture 2: A new GitHub repository for code examples

Lecture 3: Basic layout of a spreadsheet decision table

Lecture 4: Defining multiple action columns in a spreadsheet

Lecture 5: Using formulas in a spreadsheet decision table

Lecture 6: Set a custom DRL rule name and add a comment

Lecture 7: How to place several rule tables in one spreadsheet

Lecture 8: Multiple rule tables in one spreadsheet. Several parameters in a single cell.

Lecture 9: Join multiple fact objects in a spreadsheet decision table

Lecture 10: Using forall construct as a condition in spreadsheet decision tables

Lecture 11: Condition without a pattern in a spreadsheet decision table

Lecture 12: Set rule priority in a spreadsheet decision table

Lecture 13: Sequential attribute in RuleSet

Lecture 14: Using activation groups in spreadsheet decision tables

Lecture 15: Drools sequential mode

Lecture 16: Using custom labels in spreadsheet decision tables

Lecture 17: Recap Spreadsheet Decision Tables

Chapter 10: Rule templates and creating rules dynamically

Lecture 1: Rule templates intro

Lecture 2: Using Drools Rule Templates (DRT) for creating rules

Lecture 3: Fetching template placeholder values from a tabular data source

Lecture 4: Use Freemarker templates instead of deprecated Drools Rule Templates (DRT)

Lecture 5: Declare intermediate types in DRL

Lecture 6: How to declare enumerations in and read back objects of type declared in DRL

Lecture 7: Create and insert objects into the session that have type declared in DRL

Lecture 8: Rule templates recap

Chapter 11: 11. Introduction to Complex Event Processing (CEP) with Drools

Lecture 1: Complex Event Processing intro

Lecture 2: Risks of using external services to pull data that the rules depend on

Lecture 3: Using forall to find a suitable call that has waited the longest

Lecture 4: Active and passive rule execution modes

Lecture 5: Running rules repeatedly in passive mode. Using global variables.

Lecture 6: Compose a list of events with collect keyword and apply filtering to the results

Lecture 7: Calling halt(). Mixing active and passive rule execution modes.

Lecture 8: Adding different timers to a rule

Lecture 9: Stream event processing mode using a time-based sliding window

Lecture 10: Declaring fact as an event and using a length-based sliding window

Lecture 11: Using entry-point streams

Lecture 12: Recap complex event processing

Chapter 12: 12. What you need to know to write better Drools rules

Lecture 1: Drools internals intro

Lecture 2: Basic components of Drools rule engine