Master Drools programming - from Beginner to Intermediate

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Juhan Aasaru

3:16:51

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1 - 1 Introduction

1 - Introduction to course.mp4

01:02

2 - What is a Rule Engine.mp4

11:10

3 - How to Design Rules and When not to Use Drools.mp4

03:39

4 - Introduction to Drools Language Syntax.mp4

07:04

2 - 2 Example Code and Running it Locally

5 - Structure of Example Code.mp4

05:18

6 - Get example code running with IntelliJ IDEA Community Edition.mp4

04:46

6 - example project we use throughout this course.zip

7 - Get example code running with Eclipse.mp4

05:23

7 - example project we use throughout this course.zip

8 - Get example code running with Visual Studio Code VS Code.mp4

04:33

8 - link to github project where the code examples are hosted.zip

3 - 3 Stateless Sessions

9 - Introduction to Stateless Sessions.mp4

03:20

10 - Step1 First two rules to validate passports.mp4

07:02

11 - Step2 Split a rule.mp4

02:30

12 - Step3 Bind a variable.mp4

04:44

13 - Step4 Using the bound variable.mp4

02:32

14 - Steps 5 and 6 Avoid repetitions.mp4

06:04

15 - Stateless Sessions Summary.mp4

00:53

4 - 4 Stateful Sessions

16 - Introduction to Stateful Sessions.mp4

01:48

17 - Step1 Modify Object in the Middle of Session.mp4

05:35

18 - Step2 Inference.mp4

04:27

19 - Stateful Sessions Summary.mp4

00:44

5 - 5 Cross Products Drools Version of SQL JOIN

20 - Introduction to Cross Products.mp4

04:18

21 - Step1 Join Visa Application to a Passport.mp4

07:04

22 - Fixed a bug in upcoming lecture.html

23 - Step2 Is Passport Valid 6 Months After Trip.mp4

06:57

24 - Step3 When setting a value check that property is not already with this value.mp4

03:24

25 - Pattern Matching and Cross Products Summary.mp4

03:12

6 - 6 Insert New Facts and Determine Execution Order

26 - Intro to Adding New Facts Setting Execution Order.mp4

01:07

27 - Rule Dialect Change.html

28 - Note about upcoming Step.html

29 - Step1 Create a New Fact and Insert it into the Session.mp4

05:36

30 - Step2 Control Execution Order with Salience.mp4

04:50

31 - Step3 Control Execution Order with AgendaGroups.mp4

13:48

32 - Step4 Use Agenda Groups with Salience.mp4

04:47

33 - Step5 Run a Singe Rule from a Activation Group.mp4

08:06

34 - Bonus Step Step 6 Set Focus to Agenda Group In Drools Rule.html

35 - Summary of Adding Facts and Setting Execution Order.mp4

01:30

7 - 7 Insert a Fact Logically Check That a Fact Does Not Exist

36 - Introduction to Logical Insertion of Facts and Checking the Fact Does Not Exist.mp4

01:35

37 - Step1 Add Fact Using insertLogical.mp4

06:31

38 - Using optional this keyword in lefthandside of MVEL rules.html

39 - Step2 Create Fact Objects and Check that Fact Does Not Exist Using not.mp4

07:25

40 - Step3 Replace Changing of the Objects with Fact Objects.mp4

06:24

41 - Step4 Reduce the Number of Rules Needed by Eliminating Positive Cases.mp4

03:40

42 - Section Summary.mp4

01:23

8 - 8 Exists and Forall Conditional Elements

43 - Intro to working with groups of objects.mp4

01:41

44 - Step1 Rewrite visa application logic to support FamilyVisaApplications.mp4

06:46

45 - Step2 Exists keyword introduced.mp4

02:50

46 - Step3 Use forall to match group of objects.mp4

04:52

47 - Step4 Use forall to extract object from group based on minmax value.mp4

03:23

48 - Step5 Forall with only one expression.mp4

02:40

49 - Summary of Working with Groups of Facts.mp4

00:28

Description

Learn most common Drools Rule Engine language constructs needed to write business decision trees into individual rules

What You'll Learn?

program rules in Drools 7 domain specific language
detect problems and patterns in software development that are good to be solved with a rule engine like Drools
decouple complex decision trees into individual simple to understand rules
Drools language constructs like insert, modify, exists, forall, insertLogical, salience, agenda-group etc

Who is this for?

Developers and system architects who need to understand what a rule engine is and which type of problems can be solved with it

Anyone who needs to write rules in Drools DSL programming language

Developers and system architects needing more info about adding Drools rule engine to their project

More details

Description
We learn Drools DSLÂ (Drools programming language) and go over the most common DSL constructs. We move in small steps and gradually introduce new consepts so it is easier to follow even for a beginner.
This way we cover the most common Drools topics like:
what is a rule engine
what is a difference between a method and a rule
why one would use a rule engine instead of writing regular Java code
understanding of the when/then clauses
understanding in which order the rules fire and when the order is not known
how to control the execution using activation-groups, agenda-groups and salience
declaring variables in DRL
difference between stateless and stateful sessions
inserting facts and modifying existing objects in the session
cross products (similar to SQLÂ join)
exists, forall and collect
This course comes with a Java project that has all the code we look throughout this course. You are encouraged to check out and run the code yourself to get better understanding and experiment yourself with making changes to it. There are instructions how to get the code running in IntelliJ,Â Eclipse and VS Code.
After completing this course you have a better understanding of which kind of problems could be solved with Drools and how to write most common business rules in Drools DSL.
Who this course is for:
Developers and system architects who need to understand what a rule engine is and which type of problems can be solved with it
Anyone who needs to write rules in Drools DSL programming language
Developers and system architects needing more info about adding Drools rule engine to their project

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Functional Programming

Juhan Aasaru

Instructor's Courses

Since 2005 I have been working as a Java Developer / Solution Architect / CTO. I have created several in-class courses and two courses on Udemy. I'm passionate about learning new technologies and explaining them in a clear and understandable way. I'm a fan of domain-specific languages - small programming languages that are designed for a specific task. For the past years, I have been involved with a project that heavily relies on utilizing Drools Rule Engine.

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