Google App Engine实战

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"Using Google App Engine 是一本由 Charles Severance 编写的关于全面了解 Google App Engine 的书籍。本书由 O'Reilly Media 出版，详细介绍了如何使用 Google 的云计算平台进行应用开发。" 在《Using Google App Engine》这本书中，作者 Charles Severance 提供了深入的洞察力和实践经验，帮助读者理解和掌握 Google App Engine (GAE) 的核心功能和开发流程。Google App Engine 是一个基于云计算的平台，允许开发者构建和托管 web 应用程序，无需关心底层硬件和软件的维护。 GAE 提供了一系列服务，包括数据存储（使用 Google Datastore）、动态网站托管（使用 Python、Java 或 Go 等编程语言）、任务队列、电子邮件服务、身份验证以及调度器等。这本书会详细介绍如何利用这些服务来构建可扩展、高可用的应用程序。 1. **数据存储**：书中详细讲解了 Google Datastore 的非关系型数据库模型，包括实体、键、属性以及查询机制。读者将学习如何设计数据模型，实现高效的读写操作，并理解 Datastore 的分布式特性和一致性策略。 2. **应用程序开发**：针对 Python 和 Java 这两种主要支持的语言，作者提供了实际示例，展示如何编写 GAE 应用程序。这包括设置项目环境、编写 web 服务端代码、处理用户请求、集成用户认证等。 3. **高并发与可扩展性**：GAE 自动处理流量增加，通过自动扩缩容确保应用的性能。书中会讨论如何设计应用以适应这种动态环境，避免常见的可扩展性问题。 4. **任务队列与调度**：GAE 提供了后台任务处理能力，允许开发者创建异步任务和定时任务。书中有章节介绍如何有效地使用这些功能来优化工作流。 5. **安全性与身份验证**：书中涵盖了 GAE 的安全特性，如 OAuth 认证和授权，以及如何保护应用程序免受恶意攻击。 6. **部署与管理**：读者将了解到如何配置和管理应用程序，包括版本控制、部署流程、监控应用性能和日志分析。 7. **最佳实践**：作者分享了许多开发和优化 GAE 应用的最佳实践，帮助开发者避免常见陷阱，提高应用的效率和用户体验。通过阅读《Using Google App Engine》，无论是初学者还是经验丰富的开发者，都能获得对 GAE 平台的全面认识，提升在云计算环境中的开发技能。此外，书中的实例和练习有助于读者将理论知识转化为实际操作，从而更好地利用 GAE 构建高质量的 web 应用。

allow you to monitor and manage your application and data while you are in

production.

Chapter 11, Memory Cache

The App Engine Memory Cache is a critical technology for making fast and scalable

websites. Clever use of Memory Cache can dramatically reduce the load on a

Datastore or the network and increase application responsiveness, particularly for

material that is read over and over. In this chapter, we explore how the Memory

Cache works and develop simple Session capability using the Memory Cache.

Teaching with This Book

This book came out of a University of Michigan School of Information course titled

“Design of Complex Websites (SI539).” This course explores emerging web technol-

ogies, including ColdFusion, PHP, Ruby on Rails, and now Google Application Engine.

The basic idea of the course was to teach in one semester students with very limited

technical background enough about database-backed web development “to be dan-

gerous to themselves and others.” The course and book are aimed at introducing these

concepts to a nontechnical audience.

The book is written at a beginning level; I think that it can be used to support a semester-

long “Introduction to Web Programming” course from high school through graduate

school. Because this book includes introductions to Python and to HTML and CSS, I

hope that it can be used by itself or with supporting material.

For beginning students, you can have a series of assignments that are very similar to

the examples in the book, with minor changes such as color or adding images to pages.

The assignments can be made more difficult by having the students do a series of par-

allel, but different, projects that correspond roughly to the concepts in the book’s run-

ning examples.

The book can also be used to support a one-day workshop in App Engine. It would

probably be difficult to teach Python, HTML, CSS, and App Engine in a single day. But

because the examples are a single evolving application and each example builds on the

previous one, it is possible to skip steps in the interest of time. You might have one

exercise where the students modify the ae-08-login example (login without session) to

produce ae-09-session (login with session) and then skip ahead to modify the ae-11-

chat (non-AJAX chat) to produce ae-12-ajax (AJAX-based chat). The chapters walk

readers through the necessary changes from each version of the application to the next.

To help support the use of the book in a classroom setting, I provide freely reusable

classroom materials that make it easier to use the book in other courses at my personal

website (http://www.dr-chuck.com). I would love to hear from other teachers who use

the book so that we can all share our experiences, assignments, tips, and lecture

materials.

Preface | xv

For this book, Judy Loukides was also a great help in getting the book together on time.

Judy jumped in and helped at a very crucial moment when time was running out and

her help is greatly appreciated.

I have two good friends, mentors, colleagues, and coauthors in Noah Botimer and

Gonzalo Silverio. Gonzalo has always been my guide to learning CSS throughout the

Sakai project and as I taught CSS in my courses at the University of Michigan. He taught

me that CSS was really clean and straightforward. It is particularly straightforward if

you can always run to Gonzalo when you run into a difficult bit. Noah has always been

there to help me figure out the really difficult things. He is great at digging into how

something really works and helping me understand it well enough to teach the material

to my students and take all the credit.

The technical reviewers did a great job of making sure that the book was sound. Trek

Glowaki, Nick Johnson, Steven Githens, Kirby Urner, and Matt Simmons all did a great

job in a very short time frame. I also want to thank Pete Koomen of Google for his

encouragement at the 2008 Google I/O conference and throughout the process.

Paul Resnick, Sean Munson, Jim Eng, Marc Alier, and Jordi Piguillem Poch took the

risk of using the book in their courses even before it was published. I very much ap-

preciate their feedback and guidance as well as the feedback I got from their students.

I need to thank the students from the “Design of Complex Websites” course at the

University of Michigan in Fall 2008, who showed amazing patience as I gave them the

earliest versions of each chapter, often produced only a few hours before lecture. They

read the chapters carefully, patiently pointed out places where the narrative “dropped

the ball,” and reread the revised versions of the chapters.

I certainly appreciate how my students, friends, and colleagues gave me the space and

time to write the book.

And I want to thank my parents, Marcia and Russ, for setting high expectations and

helping me to learn to always think outside the box and always be prepared for new

experiences. I want to thank my wife, Teresa, and my children, Amanda and Brent, for

being patient during those months where I pretty much had no time for anything else

except “the book.”

xviii | Preface

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