本书作者完成了一项非常美妙的工程。这本书不仅涵盖了软件架构中的一些基本原理和最佳实践，它同时还涉及了广泛的当代系统。这些系统触及了不同的架构，从Enlacs到Facebook，从高度和谐的系统到更轻巧的系统。简而言之，这本书为软件架构的艺术性、科学性和实践性提供了非常及时和有益的贡献。

健壮、优雅、灵活和易维护的软件架构是怎样炼成的？本书通过一系列优秀的文章回答了这个问题，这些文章来自于十几位当今一流的软件设计师和架构师。在每篇文章中，作者都向我们展示了一个著名的软件架构，并分析了什么让其具有创新性，让其符合设计目标。

 FOREWORD

by Stephen J. Me//or

 PREFACE

Part One ON ARCHITECTURE

1 WHAT IS ARCHITECTURE?

by John Klein and Dauid Weiss

 Introduction

 Creating a Software Architecture

 Architectural Structures

 Good Architectures

 Beautiful Architectures

 Acknowledgments

 References

2 A TALE OF TWO SYSTEMS: A MODERN-DAY SOFTWARE FABLE

by Pete Goodliffe

 The Messy Metropolis

 Design Town

 So What?

 Your Turn

 References

Part Two ENTERPRISE APPLICATION ARCHITECTURE

3 ARCHITECTING FOR SCALE

by Jim Waldo

 Introduction

 Context

 The Architecture

 Thoughts on the Architecture

4 MAKING MEMORIES

by Michael Nygard

  Capabilities and Constraints

  Workflow

  Architecture Facets

  User Response

5 RESOURCE-ORIENTED ARCHITECTURES: BEING "IN THE WEB"

by Brian Sletten

 Introduction

 Conventional Web Services

 The Web

 Resource-Oriented Architectures

 Data-Driven Applications

 Applied Resource-Oriented Architecture

 Conclusion

6 DATA GROWS UP: THE ARCHITECTURE OF THE FACEBOOK PLATFORM

by Daue Fetterman

 Introduction

 Creating a Social Web Service

 Creating a Social Data Query Service

 Creating a Social Web Portal: FBML

 Supporting Functionality for the System

 Summation

Part Three SYSTEMS ARCHITECTURE

7 XEN AND THE BEAUTY OF VIRTUALIZATION

by Derek Murray and Keir Fraser

 Introduction

 Xenoservers

 The Challenges of Virtualization

 Paravirtualization

 The Changing Shape of Xen

 Changing Hardware, Changing Xen

 Lessons Learned

 Further Reading

8 GUARDIAN: A FAULT-TOLERANT OPERATING SYSTEM ENVIRONMENT

by GreR Lehey

 Tandem/16: Some Day All Computers Will Be Built Like This

 Hardware

 Mechanical Layout

 Processor Architecture

 The Interprocessor Bus

 Input/Output

 Process Structure

 Message System

 File System

 Folklore

 The Downside

 Posterity

 Further Reading

9 JPC: AN X86 PC EMULATOR IN PURE JAVA

by Rhys Nemman and Christopher Dennis

 Introduction

 Proof of Concept

 The PC Architecture

 Java Performance Tips

 Four in Four: It Just Won't Go

 The Perils of Protected Mode

 Fighting A Losing Battle

 Hijacking the JVM

 Ultimate Flexibility

 Ultimate Security

 It Feels Better the Second Time Around

10 THE STRENGTH OF METACIRCULAR VIRTUAL MACHINES:JIKES RVM

 by/an Rogers and Daue Groue

 Background

 Myths Surrounding Runtime Environments

 A Brief History ofJikes RVM

 Bootstrapping a Self-Hosting Runtime

 Runtime Components

 Lessons Learned

 References

Part Four END-USER APPLICATION ARCHITECTURES

11 GNU EMACS: CREEPING FEATURISM IS A STRENGTH

by Jim Blandy

 Emacs in Use

 Emacs's Architecture

 Creeping Featurism

 Two Other Architectures

12 WHEN THE BAZAAR SETS OUT TO BUILD CATHEDRALS

by Till Adam and Mirko Boehm

 Introduction

 History and Structure of the KDE Project

 Akonadi

 ThreadWeaver

Part Five LANGUAGES AND ARCHITECTURE

13  SOFTWARE ARCHITECTURE: OBJECT-ORIENTED VERSUS FUNCTIONAL

by Bertrand Meyer

 Overview

 The Functional Examples

 Assessing the Modularity of Functional Solutions

 An Object-Oriented View

 Assessing and Improving OO Modularity

 Agents: Wrapping Operations into Objects

 Acknowledgments

 References

14  REREADING THE CLASSICS

by Panagiotis Louriclas

 Everything Is an Object

 Types Are Defined Implicitly

 Problems

 Brick and Mortar Architecture

 References

AFTERWORD

by William J. Mitchell

CONTRIBUTORS

INDEX