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  • Book Overview & Buying Mastering JBoss Drools 6
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Mastering JBoss Drools 6

Mastering JBoss Drools 6

By : Mariano De Maio, Salatino, Aliverti
3 (1)
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Mastering JBoss Drools 6

Mastering JBoss Drools 6

3 (1)
By: Mariano De Maio, Salatino, Aliverti
Buy this Book

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.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Free Chapter
1
1. Rules Declarative Nature
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1. Rules Declarative Nature
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What are rules?
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Why do we use rules?
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When should we use rules?
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When not to use a rule engine
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Summary
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2. Writing and Executing Rules
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2. Writing and Executing Rules
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Setting up our environment
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Creating our first Drools project
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Writing and executing our first rule
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The Rule language
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Organizing our projects
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Summary
3
3. Drools Runtime
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3. Drools Runtime
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Understanding the Drools runtime instances
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KieModule configurations (KieBases, KieSessions & StatelessKieSessions)
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KieScanner
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Summary
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4. Improving Our Rule Syntax
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4. Improving Our Rule Syntax
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Adding external interactions with global variables
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Modifying the data in the working memory
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Rule attributes
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Controlling loops in rules
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Special Drools operations
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Working memory breakdown: the from clause
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Drools syntactic sugar
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Decorating our objects in memory
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Logical insertion of elements
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Rule inheritance
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Summary
5
5. Understanding KIE Sessions
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5. Understanding KIE Sessions
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Stateless and stateful Kie Sessions
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Kie runtime components
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Kie Base components
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Summary
6
6. Complex Event Processing
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6. Complex Event Processing
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What is complex event processing?
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Declaring CEP-based Rules
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Event-driven architecture
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Running CEP-based Scenarios
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Drools CEP limitations
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Summary
7
7. Human-Readable Rules
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7. Human-Readable Rules
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Domain Specific Languages
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Decision tables
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Rule templates
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PMML
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Summary
8
8. Rules' Testing and Troubleshooting
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8. Rules' Testing and Troubleshooting
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Create loosely coupled DRLs
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Prefer KieHelper over a KieContainer classpath
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Benefits of using globals
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Debugging the left-hand side of a rule
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Debugging the right-hand side of a rule
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Reporting a bug in Drools
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Summary
9
9. Introduction to PHREAK
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9. Introduction to PHREAK
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Introducing PHREAK
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Special nodes in the network
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Queries and backward-chaining
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PHREAK improvements over RETE
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Phreak Inspector
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Summary
10
10. Integrating Rules and Processes
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10. Integrating Rules and Processes
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jBPM – the process engine
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Simple business process example
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Drools and jBPM: integration patterns
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Persistence and transactions
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Summary
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11. Integrating Drools with our Apps
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11. Integrating Drools with our Apps
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Architecture considerations
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Integrating with the rest of an application
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CDI integration
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Spring integration
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Camel integration
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Kie Execution Server
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Kie Workbench
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Drools and beyond: extending our functionality
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Summary
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Index
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Index

Drools and jBPM: integration patterns

It is fundamental for us to understand why jBPM and Drools coexist under the KIE umbrella. The relationship between the two projects and the similarities they have make them share most tools and methodologies. These two projects complement each other, allowing end users to describe business knowledge using different paradigms and languages to model business scenarios. We will be able to choose the right tool for the job and then combine the power of the Rule world with the Process world.

This section will cover three of the most common patterns of rule and process integration. The main idea here is to open our mind to look for new alternatives to implement our business solutions.

We already learned in this chapter how to start new process instances by using the KIE APIs, but now we will see how we can interact with the process engine from within our rules.

In the next section we will learn how to interact with the Process engine from our rules. This will...

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