迈向云应用：第三版全方位指南

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《移动应用到云端（第三版）》是由Dominic Betts、Alex Homer、Alejandro Jezierski、Masashi Narumoto和Hanz Zhang共同编著的一本专著，旨在帮助读者理解和实践将应用程序迁移到Microsoft Windows Azure™平台的过程。本书是针对技术专业人士和开发者的实用指南，特别是那些希望利用云技术扩展其业务或优化IT架构的人。该书第三版更新了关于Azure的内容，这是在Microsoft的云计算服务平台上，涵盖了Azure的多个关键组件如Active Directory、MSDN、SQL Server、Visual C#、Visual C++、Visual Basic、Visual Studio等。通过深入浅出的方式，作者们提供了详细的指导，包括但不限于如何设计、迁移和管理云应用，以及如何利用Windows Azure SQL Database和Windows Live等服务进行数据存储和社交集成。书中还强调了实际操作中的注意事项，如文档可能未经通知就发生变更，提供的示例仅用于演示，并非真实的商业案例。版权方面，所有内容受Microsoft集团商标保护，同时尊重其他相关公司的知识产权。全书共分为以下几个部分： 1. **序言 - Yousef Khalidi**: 由本书序言作者对第三版的重要性和背景进行了概述，可能提及技术趋势和发展。 2. **第三版序言**：着重介绍了新版本的更新内容，可能包括对Azure平台的新功能介绍，以及与前一版相比的改进之处。 3. **本书适用对象**：明确指出本书的目标读者，包括初级到高级的开发者、IT管理员和架构师，以及对云计算有兴趣的商业用户。 4. **前言**：概括性地阐述了写作目的、预期目标和读者可以从中获得的知识收益。《移动应用到云端（第三版）》不仅是一本技术手册，也是一本实战指南，提供了丰富的实践案例和最佳实践，帮助读者在迁移过程中克服挑战，实现应用程序在云端的高效运行。随着云计算的日益普及和Azure的持续发展，这本书对于IT专业人士来说是一份不可多得的参考资料。

xvi

W’ W

As mentioned earlier, this book uses a set of scenarios that demonstrates how to move applications to

the cloud. A panel of experts comments on the development efforts. The panel includes a cloud spe-

cialist, a software architect, a software developer, and an IT professional. The scenarios can be consid-

ered from each of these points of view. The following table lists the experts for these scenarios.

Bharath is a cloud specialist. He checks that a cloud-based solution will work for a

company and provide tangible beneﬁts. He is a cautious person, for good reasons.

“Moving a single application to the cloud is easy. Realizing the beneﬁts

that a cloud-based solution can offer is not always so straight-forward”.

Jana is a software architect. She plans the overall structure of an application. Her

perspective is both practical and strategic. In other words, she considers not only

what technical approaches are needed today, but also what direction a company

needs to consider for the future.

Markus is a senior software developer. He is analytical, detail-oriented, and

methodical. He’s focused on the task at hand, which is building a great cloud-

based application. He knows that he’s the person who’s ultimately responsible

for the code.

“I don’t care what platform you want to

use for the application, I’ll make it work.”

Poe is an IT professional who’s an expert in deploying and running in a corporate

data center. Poe has a keen interest in practical solutions; after all, he’s the one

who gets paged at 3:00 AM when there’s a problem.

“It’s not easy to balance the needs of the company, the users, the IT

organization, the developers, and the technical platforms we rely on.

If you have a particular area of interest, look for notes provided by the specialists whose interests align

with yours.

“Migrating to the cloud involves a big change in the way we manage our applications.

I want to make sure our cloud apps are as reliable and secure as our on-premise apps.”

xvii

Acknowledgments

On March 4th 2010 I saw an email from our CEO, Steve Ballmer, in my inbox. I don’t normally receive

much email from him, so I gave it my full attention. The subject line of the email was: “We are all in,”

and it summarized the commitment of Microsoft to cloud computing. If I needed another conﬁrma-

tion of what I already knew, that Microsoft is serious about the cloud, there it was.

My ﬁrst contact with what eventually became Windows Azure was about three years ago. I was in the

Developer & Platform Evangelism (DPE) team, and my job was to explore the world of software de-

livered as a service. Some of you might even remember a very early mockup I developed in late 2007,

called Northwind Hosting. It demonstrated many of the capabilities that the Windows Azure platform

offers today. (Watching an initiative I’ve been involved with since the early days become a reality

makes me very, very happy.)

In February 2009, I left DPE and joined the patterns & practices team. My mission was to lead the

“cloud program”: a collection of projects that examined the design challenges of building applications

for the cloud. When the Windows Azure platform was announced, demand for guidance about it

skyrocketed.

As we examined different application development scenarios, it became quite clear that identity man-

agement is something you must get right before you can consider anything else. It’s especially impor-

tant if you are a company with a large portfolio of on-premises investments, and you want to move

some of those assets to the cloud. This describes many of our customers. Therefore, patterns &

practices’s ﬁrst deliverable, and an important milestone in our cloud program, was A Guide to Claims-

Based identity and Access Control.

The Windows Azure platform is special in many ways. One is the rate of innovation. The various teams

that deliver all of the platform’s systems proved that they could rapidly ship new functionality. To keep

up with them, I felt we had to develop content very quickly. We decided to run our projects in two-

months sprints, each one focused on a speciﬁc set of considerations.

This guide, now fully updated to cover the new capabilities of Windows Azure, mainly covers a migra-

tion scenario: how to move an existing application to the Windows Azure platform. As in the claims

guide, we’ve developed a ﬁctitious case study that explains, step by step, the challenges our customers

are likely to encounter.

xviii

I want to start by thanking the following subject matter experts and contributors to this guide:

Dominic Betts, Scott Densmore, Ryan Dunn, Steve Marx, and Matias Woloski. Dominic has the un-

usual skill of knowing a subject in great detail and of ﬁnding a way to explain it to the rest of us that is

precise, complete, and yet simple to understand. Scott brought us a wealth of knowledge about how

to build scalable Windows Azure applications, which is what he did before he joined my team. He also

brings years of experience about how to build frameworks and tools for developers. I’ve had the privi-

lege of working with Ryan in previous projects, and I’ve always beneﬁted from his acuity, insights, and

experience. As a Windows Azure evangelist, he’s been able to show us what customers with very real

requirements need. Steve is a technical strategist for Windows Azure. He’s been instrumental in shap-

ing this guide. We rely on him to show us not just what the platform can do today but how it will

evolve. This is important because we want to provide guidance today that is aligned with longer-term

goals. Last but not least, Matias is a veteran of many projects with me. He’s been involved with

Windows Azure since the very ﬁrst day, and his efforts have been invaluable in creating this guide.

As it happens with all our written content, we have sample code for most of the chapters. They

demonstrate what we talk about in the guide. Many thanks to the project’s development and test

teams for providing a good balance of technically sound, focused and simple-to-understand code:

Masashi Narumoto (Microsoft Corporation), Scott Densmore (Microsoft Corporation), Federico

Boerr (Southworks), Adrián Menegatti (Southworks), Hanz Zhang (Microsoft Corporation), Ravindra

Mahendravarman (Infosys Ltd.), Rathi Velusamy (Infosys Ltd.).

Our guides must not only be technically accurate but also entertaining and interesting to read. This is

no simple task, and I want to thank Dominic Betts, RoAnn Corbisier (Microsoft Corporation), Alex

Homer (Microsoft Corporation), and Tina Burden from the writing and editing team for excelling at this.

The visual design concept used for this guide was originally developed by Roberta Leibovitz and Colin

Campbell (Modeled Computation LLC) for A Guide to Claims-Based Identity and Access Control.

Based on the excellent responses we received, we decided to reuse it for this book. The book design

was created by John Hubbard (eson). The cartoon faces were drawn by the award-winning Seattle-

based cartoonist Ellen Forney. The technical illustrations were adapted from my Tablet PC mockups

by Chris Burns.

All of our guides are reviewed, commented upon, scrutinized, and criticized by a large number of

customers, partners, and colleagues. We also received feedback from the larger community through

our CodePlex website. The Windows Azure platform is broad and spans many disciplines. We were

very fortunate to have the intellectual power of a very diverse and skillful group of readers available

to us.

I also want to thank all of these people who volunteered their time and expertise on our early content

and drafts. Among those, we want to highlight the exceptional contributions of Jorge Rowies (South-

works), Marcos Castany (Southworks), Federico Boerr (Southworks), Corey Sanders (Microsoft

Corporation), Nir Mashkowski (Microsoft Corporation), Ganesh Srinivasan (Microsoft Corporation),

Jane Sinyagina (Microsoft Corporation), Rick Byham (Microsoft Corporation), Boris Scholl (Microsoft

Corporation), and Paul Yuknewicz (Microsoft Corporation).

I hope you ﬁnd this guide useful!

Eugenio Pace

Senior Program Manager – patterns & practices

Microsoft Corporation

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