Book Image

Mastering JBoss Drools 6

By : Mariano De Maio, Mauricio Salatino, Esteban Aliverti
Book Image

Mastering JBoss Drools 6

By: Mariano De Maio, Mauricio Salatino, Esteban Aliverti

Overview of this book

Mastering JBoss Drools 6 will provide you with the knowledge to develop applications involving complex scenarios. You will learn how to use KIE modules to create and execute Business Rules, and how the PHREAK algorithm internally works to drive the Rule Engine decisions. This book will also cover the relationship between Drools and jBPM, which allows you to enrich your applications by using Business Processes. You will be briefly introduced to the concept of complex event processing (Drools CEP) where you will learn how to aggregate and correlate your data based on temporal conditions. You will also learn how to define rules using domain-specific languages, such as spreadsheets, database entries, PMML, and more. Towards the end, this book will take you through the integration of Drools with the Spring and Camel frameworks for more complex applications.

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Mastering JBoss Drools 6
Mariano De Maio | Mauricio Salatino | Esteban Aliverti
Mar, 2016 | 330 pages
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Table of Contents (18 chapters)
Mastering JBoss Drools 6
Mastering JBoss Drools 6
Credits
Credits
About the Authors
About the Authors
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Rules Declarative Nature
Rules Declarative Nature
What are rules?
Why do we use rules?
When should we use rules?
When not to use a rule engine
Summary
2
Writing and Executing Rules
Writing and Executing Rules
Setting up our environment
Creating our first Drools project
Writing and executing our first rule
The Rule language
Organizing our projects
Summary
3
Drools Runtime
Drools Runtime
Understanding the Drools runtime instances
KieModule configurations (KieBases, KieSessions & StatelessKieSessions)
KieScanner
Summary
4
Improving Our Rule Syntax
Improving Our Rule Syntax
Adding external interactions with global variables
Modifying the data in the working memory
Rule attributes
Controlling loops in rules
Special Drools operations
Working memory breakdown: the from clause
Drools syntactic sugar
Decorating our objects in memory
Logical insertion of elements
Rule inheritance
Summary
5
Understanding KIE Sessions
Understanding KIE Sessions
Stateless and stateful Kie Sessions
Kie runtime components
Kie Base components
Summary
6
Complex Event Processing
Complex Event Processing
What is complex event processing?
Declaring CEP-based Rules
Event-driven architecture
Running CEP-based Scenarios
Drools CEP limitations
Summary
7
Human-Readable Rules
Human-Readable Rules
Domain Specific Languages
Decision tables
Rule templates
PMML
Summary
8
Rules' Testing and Troubleshooting
Rules' Testing and Troubleshooting
Create loosely coupled DRLs
Prefer KieHelper over a KieContainer classpath
Benefits of using globals
Debugging the left-hand side of a rule
Debugging the right-hand side of a rule
Reporting a bug in Drools
Summary
9
Introduction to PHREAK
Introduction to PHREAK
Introducing PHREAK
Special nodes in the network
Queries and backward-chaining
PHREAK improvements over RETE
Phreak Inspector
Summary
10
Integrating Rules and Processes
Integrating Rules and Processes
jBPM – the process engine
Simple business process example
Drools and jBPM: integration patterns
Persistence and transactions
Summary
11
Integrating Drools with our Apps
Integrating Drools with our Apps
Architecture considerations
Integrating with the rest of an application
CDI integration
Spring integration
Camel integration
Kie Execution Server
Kie Workbench
Drools and beyond: extending our functionality
Summary
Index
Index

About the Reviewer

Mario Fusco is a senior software engineer at Red Hat. He was born in Napoli, Italy. He works on the development of the core of Drools, the open source JBoss rule engine. He has huge experience as a Java developer, having been involved in (and often leading) many enterprise level projects in several industries, ranging from media companies to the financial sector.

Among his interests, there are also functional programming and Domain Specific Languages. By leveraging these two passions, he has created the open source library lambdaj with the purpose of providing an internal Java DSL for manipulating collections and allowing a bit of functional programming in Java before the introduction of lambda expressions.

He is the co-author of Java 8 in Action, published by Manning, and a technical speaker at several conferences both international, such as Devoxx and JavaOne, and local, such as Voxxed Days and Codemotion. He is also a co-lead of the Java User Group of Milano, Italy, and the leader of the program committee at both Voxxed Days Zurich and Voxxed Days Ticino.

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