Drools JBoss Rules 5.0 开发者指南

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"Drools JBoss Rules 5.0 Developer's Guide 是一本关于使用Drools平台开发基于规则的业务逻辑的开发者指南，作者是Michal Bali，由Packt Publishing出版。本书适用于想要掌握Drools规则引擎的Java开发者。" Drools是一个开源的业务规则管理系统（BRMS），它提供了强大的规则引擎，使得开发人员可以轻松地在Java应用中实现复杂的业务逻辑。Drools是JBoss组织的一部分，因此与JBoss企业级中间件平台紧密集成。它允许开发者用自然语言或特定的领域特定语言（DSL）编写规则，并在运行时高效执行这些规则。该书"Drools JBoss Rules 5.0 Developer's Guide"涵盖了以下关键知识点： 1. **Drools简介**：介绍Drools的背景、目标以及在业务流程自动化中的作用，解释了它如何作为规则引擎简化决策逻辑的管理。 2. **Drools架构**：阐述Drools的核心组件，如规则编译器、工作内存、执行引擎和事实对象，以及它们如何协同工作来执行规则。 3. **规则语言**：详细介绍Drools的规则定义语言，包括DRL（Drools Rule Language）和MVEL表达式，以及如何使用这些语言编写规则。 4. **规则生命周期**：解释规则的创建、存储、加载、激活和执行的过程，以及如何在运行时修改规则库。 5. **工作流和决策流程**：探讨如何使用Drools工作流引擎构建和管理决策流程，包括状态机和流程图的概念。 6. **事实处理**：讨论如何处理和管理业务逻辑中的事实对象，包括插入、更新和删除事实。 7. **规则推理**：介绍Drools的推理机制，包括冲突解决策略和规则优先级，以及如何控制规则的执行顺序。 8. **测试和调试**：提供有关如何测试规则以及使用Drools的调试工具的指导，以确保规则的正确性和性能。 9. **整合Drools到Java应用**：展示如何将Drools集成到现有的Java EE或Spring应用程序中，包括配置和依赖注入。 10. **性能优化**：讨论提高Drools规则引擎性能的方法，如规则优化、内存管理和并发执行。 11. **案例研究**：通过实际示例演示Drools在不同场景下的应用，如财务规则、风险评估等。本书面向有Java基础的开发者，旨在帮助他们快速上手并精通Drools，以便在实际项目中实现灵活、可维护的业务规则。尽管出版日期为2009年，但Drools的基本原理和许多核心概念仍然适用于当前版本。对于希望深入理解和使用Drools规则引擎的开发者来说，这本书仍然是一个宝贵的资源。

Table of Contents

[ vii ]

KnowledgeBase partitioning 273

Parallel execution 274

Summary 275

Appendix A: Development Environment Setup 277

Environment setup 277

Dependencies and their licenses 279

Appendix B: Custom Operator 281

Summary 287

Appendix C: Dependencies of Sample Application 289

Index 293

This material is copyright and is licensed for the sole use by Mauricio Esquenazi on 21st July 2009

10 Kenmare St. #4, , New York, , 10012

Download at Boykma.Com

Preface

Business rules and processes can help your business by providing a level of agility

and exibility. As a developer, you will be largely responsible for implementing

these business rules and processes effectively, but implementing them systematically

can often be difcult due to their complexity. Drools, or JBoss Rules, makes

the process of implementing these rules and processes quicker and handles the

complexity, making your life a lot easier!

This book guides you through various features of Drools, such as rules, ruleows,

decision tables, complex event processing, Drools Rete implementation with various

optimizations, and others. It will help you to set up the Drools platform and start

creating your own business. It's easy to start developing with Drools if you follow

our real-world examples that are intended to make your life easier.

Starting with an introduction to the basic syntax that is essential for writing rules,

the book will guide you through validation and human-readable rules that dene,

maintain, and support your business agility. As a developer, you will be expected

to represent policies, procedures, and constraints regarding how an enterprise

conducts its business; this book makes it easier by showing you the ways in which

it can be done.

A real-life example of a banking domain allows you to see how the internal workings

of the rules engine operate. A loan approval process example shows the use of the

Drools Flow module. Parts of a banking fraud detection system are implemented

with Drools Fusion module, which is the Complex Event Processing part of Drools.

This in turn, will help developers to work on preventing fraudulent users from

accessing systems in an illegal way.

Finally, more technical details are shown on the inner workings of Drools, the

implementation of the ReteOO algorithm, indexing, node sharing, and partitioning.

This material is copyright and is licensed for the sole use by Mauricio Esquenazi on 21st July 2009

10 Kenmare St. #4, , New York, , 10012

Download at Boykma.Com

Preface

[ 2 ]

What this book covers

Chapter 1: This chapter introduces the reader to the domain of business rules and

business processes. It talks about why the standard solutions fail at implementing

complex business logic. It shows a possible solution in the form of a declarative

programming model. The chapter talks about advantages and disadvantages of

Drools. A brief history of Drools is also mentioned.

Chapter 2: This chapter shows us the basics of working with the Drools rule

engine—Drools Expert. It starts with a simple example that is explained step-by-step.

It begins with the development environment setup, writing a simple rule, and then

executing it. The chapter goes through some necessary keywords and concepts that

are needed for more complex examples.

Chapter 3: This chapter introduces the reader to a banking domain that will

be the basis for examples later in this book. The chapter then goes through an

implementation of a decision service for validating this banking domain.

A reporting model is designed that holds reports generated by this service.

Chapter 4: This chapter shows how Drools can be used for carrying out complex data

transformation tasks. It starts with writing some rules to load the data, continues

with the implementation of various transformation rules, and nally puts together

the results of this transformation. The chapter shows how we can work with a

generic data structure such as a map in Drools.

Chapter 5: The focus of this chapter is on rules that are easy to read and change.

Starting with domain specic languages, the chapter shows how to create a data

transformation specic language. Next, it focuses on decision tables as another

more user-friendly way of representing business rules. An interest rate calculation

example is shown. Finally, the chapter introduces the reader to Drools Flow module

as a way of managing the rule execution order.

Chapter 6: This chapter talks about executing the validation decision service in a

stateful manner. The validation results are accumulated between service calls. This

shows another way of interacting with a rule engine. Logical assertions are used

to keep the report up-to-date. Various ways of serializing a stateful session

are discussed.

Chapter 7: This chapter talks about Drools Fusion—another cornerstone of the

Drools platform is about writing rules that react to various events. The power of

Drools Fusion is shown through a banking fraud detection system. The chapter

goes through various features such as events, type declarations, temporal operators,

sliding windows, and others.

This material is copyright and is licensed for the sole use by Mauricio Esquenazi on 21st July 2009

10 Kenmare St. #4, , New York, , 10012

Download at Boykma.Com

Preface

[ 3 ]

Chapter 8: This chapter goes into more detail about the workow aspect of the Drools

platform. It is showed through a loan approval service that demonstrates the use of

various nodes in a ow. Among other things, the chapter talks about implementing

a custom work item, human task, or a sub-ow.

Chapter 9: The purpose of this chapter is to show you how to integrate Drools in a

real web application. We'll go through design and implementation of persistence,

business logic, and presentation layers. All of the examples written so far will be

integrated into this application.

Chapter 10: The focus of this chapter is to give you an idea about the various

ways of testing your business logic. Starting with unit testing, integration testing

through acceptance testing that will be shown with the help of the Business Rules

Management Server—Guvnor, this chapter provides useful advice on various

troubleshooting techniques.

Chapter 11: This chapter shows integration with the Spring Framework. It describes

how we can make changes to rules and processes while the application runs. It

shows how to use an external build tool such as Ant to compile rules and processes.

It talks about the rule execution server that allows us to execute rules remotely. It

briey mentions support of various standards.

Chapter 12: This chapter goes under the hood of the Drools rule engine. By

understanding how the technology works, you'll be able to write more efcient rules

and processes. It talks about the ReteOO algorithm, node sharing, node indexing,

and rule partitioning for parallel execution.

Appendix A: It lists various steps required to get you up and running with Drools.

Appendix B: It shows an implementation of a custom operator that can be used to

simplify our rules.

Appendix C: It lists various dependencies used by the sample web application.

What you need for this book

In order to learn Drools and run the examples in this book, you'll need a computer

with any Operating System (Windows, Mac, or Linux), Java Development Kit (JDK)

version 1.5 or later, Drools binary distribution, some IDE—preferably Eclipse IDE

for Java EE developers, Drools plugin for Eclipse, and some third-party libraries that

will be specied per chapter. All of the mentioned software is freely available on the

Internet under a business friendly license.

You can download some additional support material from

http://code.google.com/p/droolsbook/.

This material is copyright and is licensed for the sole use by Mauricio Esquenazi on 21st July 2009

10 Kenmare St. #4, , New York, , 10012

Download at Boykma.Com

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