深入理解与实践依赖注入：Spring与Guice最佳指南

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"《Dependency Injection In Action》是一本深度讲解依赖注入（Dependency Injection, DI）概念的实战指南，特别关注了Spring和快速发展的Google Guice中的实践最佳方法。该书详细探讨了依赖注入，有时也称为控制反转（Inversion of Control, IoC），并提供了丰富的实际案例，帮助开发者理解和掌握这一核心设计模式。作者Dhanji R. Prasanna是一位经验丰富的技术专家，自Google Guice初期就与之紧密关联。在Guice 1.0发布不久后，他就展示了如何将一个复杂的Swing应用成功地重构为使用Guice，这带来了显著的设计优化、性能提升和可靠性增强。他的工作不仅赢得了Guice团队的认可，还促使他们采纳了一些早期的功能请求。 Prasanna基于自己在企业级Java标准开发上的深厚积累，进一步推出了Warp Persist和Warp Servlets两个重要的Guice扩展。Warp Persist整合了标准Java持久化API，如JPA，并支持声明式事务管理，是现代企业级Java栈不可或缺的一部分。而Warp Servlets则无缝扩展了Guice的简洁、纯Java配置风格，使其适用于企业级应用。通过这本书，读者可以学习到如何有效地应用依赖注入技术，理解其优点和局限性，以及避免常见的陷阱和边缘情况。书中涵盖了诸如基础概念的小实例，以及大型项目中的应用场景，让读者能全面掌握DI在Spring和Guice等流行框架中的实践。由于主要以Java为中心，这本书适合对Java、Ruby或C#有扎实面向对象编程知识的开发者阅读，无论是初级还是高级开发者，都能从中获益匪浅。"

preface

The reasonable man adapts himself to the world; the unreasonable one persists in trying

to adapt the world to himself. Therefore, all progress depends on the unreasonable man.

—George Bernard Shaw

So, novice-expert-aficionado-learner, welcome to our dependency injection theme

park! We’ll begin this tour of dependency injection at the gate: by first defining the

problem it solves.

The tour will then proceed down the streams of specific implementations and pop-

ular technologies, examining quick solutions in such frameworks as Guice, Spring,

and PicoContainer, among others. A long break will follow for the purpose of theoret-

ical nourishment, where we shall discuss the foundational idioms behind dependency

injection, its core viral ideology, its types and practices.

Then, we’ll peruse the hall of curiosities where we consider such peculiar notions

as objects with managed state, lifecycle, and modularity and examine their curious

aspectual behaviors.

In turn, we’ll descend into the caverns of pitfalls, nuances, and corner cases that

ought to titillate and horrify the strongest of constitutions; for when you cross these

lines you can expect the demons of class loading, dynamic proxying, and unintended

encapsulation to rear their ugly heads, only to be shown up by even greater challenges

of concurrency.

We’ll make a round about the marvelous gilded architectures of enterprise appli-

cations, casting a purposeful eye at their grandeur, which is composed of modular,

Licensed to Gayle M. Noll <pedbro@gmail.com>

Download at Boykma.Com

ACKNOWLEDGMENTS

xviii

Tom Wilson, my team lead at ThoughtWorks, put up with months of my trying

behavior while having the courage to listen to every worthwhile idea I brought up and

to shoot down every worthless one. Paul Hammant, the PicoContainer author, care-

fully reviewed many of my early drafts and suggested many corrections. Jon Tirsen,

Kevin Bourrillion, Josh Bloch, and Ghassan Mishergi at Google always had time for my

rantings and my incessant and often obtuse questioning. Concurrency experts Tim

Peierls and Brian Goetz corrected me at different times about pants being up or

down. Mike Brock and Michael Neale from Red Hat kept me honest by telling me

when I was being silly. Brad Dwyer, Jody Elson, and Dr. George Corliss never refused a

request to read or comment on drafts. Thanks also to Robbie Vanbrabant, who con-

tributes to warp-persist, and Mike Bain, my great friend and the best iteration man-

ager ThoughtWorks has ever had.

A special note of thanks to the many reviewers who read my manuscript a number

of times during development, contributing feedback and insights along the way that

helped make this a much better book. I am grateful to them for their time and efforts:

Dan Dobrin, Frank Wang, Paul King, Rick Wagner, Robert Hanson, Shreekanth Joshi,

Wahid Sadik, Dave Corun, Sam Newman, Andrew Konkol, David Strong, Patrick Ste-

ger, Jon Skeet, Martyn Fletcher, Marcus Baker, Howard Lewis Ship, Mark Seemann,

Ramarao Kanneganti, and King Wang.

I would also like to thank the production team at Manning for turning my manu-

script into the book you are now reading: copyeditor Linda Recktenwald, proofreader

Elizabeth Martin, typesetter Gordan Salinovic, cover designer Leslie Haimes, and proj-

ect manager Mary Piergies.

I owe a massive debt to Josh McDonald, who created the elegant and subtle theme

that is in all the illustrations and who was kind enough to draw many of them. Also for

his contributions to my open source project work as well as the many beers he has put

back on my account.

Special words of appreciation to Yutgong Au, my close friend and closet artistic

genius, who created many of the icons and line drawings in this book, producing

them at a moment’s notice any time I asked for them.

And to Zac Steacy for being my all around best friend, every day.

Licensed to Gayle M. Noll <pedbro@gmail.com>

Download at Boykma.Com

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