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 Authors

Mauricio Salatino is a Senior software engineer at JBoss/RedHat. Mauricio works full time as a Drools and jBPM Core Developer and is in charge of developing the new generation Business Process Management Suite, along with contributing to the evolution of Drools and jBPM. Mauricio is the author of three Packt Publishing books about jBPM: jBPM6 Developer Guide, jBPM5 Developer Guide, and jBPM Developer Guide. Mauricio is based in London, UK, and in his spare time he likes to meet community members of different open source projects to build interesting projects.

Mariano De Maio is an IT consultant and software developer with over eleven years of experience in Java and open source frameworks. He has been working with Drools and jBPM for the last six years and has collaborated with the Drools and jBPM projects several items, including Infinispan's persistence modules, extensions to the jBPM APIs, and different add-ons to the tooling functionality. In 2013, he wrote jBPM6 Developer Guide for Packt Publishing, along with Mauricio Salatino and Esteban Aliverti. In 2015, he co-founded jWoop, http://www.jwoop.com, which is a company that provides consultancy and training around the world. He has participated in international conferences, such as Decision Camp and other Decision Management webinars. Mariano is based in Buenos Aires, where he is happily married to his wife, Tamara, and takes care of his beautiful daughter, Sofia. In his free time, he likes to work on contributions to the open source projects he is using. He also runs his personal blog, http://marianbuenosayres.wordpress.com, about jBPM, Drools, and Decision Management. You can find him through the official Drools IRC channel #drools at irc.freenode.net, under the nickname mariano or mariano84.

Esteban Aliverti is a software engineer and a former Drools/JBPM consultant. He is also a fervent open source promoter and developer with meaningful contributions to the JBoss Drools and JBPM frameworks for the past six years. He is the coauthor of jBPM5 Developer Guide and jBPM6 Developer Guide by Packt Publishing and was awarded the JBoss' Community Recognition Award in 2012 and 2013.

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