Drools 5.0企业规则开发指南：RETE算法与高效业务逻辑实现

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《Drools JBoss Rules 5.0开发者指南》是一本专注于使用Drools平台开发基于规则的商业逻辑的专业技术书籍。Drools是 Charles Forgy 的 RETE 算法在开源领域的一个实现，它以其易用性、灵活性和高效的特性闻名于企业级策略管理和决策支持系统中。本书由 Michal Bali 编写，旨在帮助读者深入理解并掌握这一强大的规则引擎。 Drools JBoss Rules 5.0 是一个版本迭代，它提供了一套完整的工具集，使开发者能够设计、编写和部署业务规则，以自动化复杂的决策过程。该引擎遵循业界标准，其速度和性能使得它在实时应用中表现出色，如供应链管理、金融风控或客户服务等领域。本书详细介绍了Drools的各个方面，包括规则语义、工作流程、决策表、函数和算子等核心概念，以及如何利用规则库、知识基础和规则单元来构建和管理规则模型。此外，书中还会涵盖如何通过API或图形用户界面（GUI）工具创建规则，并探讨了规则的执行策略，如预编译、缓存优化以及规则触发器的设置。对于开发者来说，本书不仅提供了理论知识，还包含了丰富的实战示例和最佳实践，使读者能够在实践中快速上手。同时，由于版权原因，所有内容需经Packt Publishing授权才能复制、存储或传输，以确保知识产权的尊重。值得注意的是，尽管作者和出版商已经尽最大努力保证书中的信息准确无误，但书中提供的内容并不保证在所有情况下都能产生预期结果，且不承担因使用本书内容而产生的任何直接或间接损失的责任。为了保持信息的时效性，书中提及的商标信息可能会有更新，读者在实际操作时应核对最新的官方资料。《Drools JBoss Rules 5.0开发者指南》适合已有编程基础，特别是Java背景的开发者，以及对规则引擎感兴趣的业务分析师和架构师，希望通过学习掌握Drools规则引擎进行智能化决策的解决方案设计。

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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