[推荐]将软件作为一个服务Software as a Service SaaS

http://msdn.microsoft.com/architecture/learnmore/default.aspx?pull=/library/en-us/dnbda/html/ArchStratCtchLngTail.asp

Summary: This provides an overview of the software-as-a-service (SaaS) model for software delivery, provides a high-level description of the architecture of a SaaS application, and discusses the challenges and benefits of developing and offering SaaS. (26 printed pages)

Contents

Introduction
What Is Software as a Service?
Thinking About Software as a Service
Changing the Business Model
The Three Attributes of a Single-Instance Multi-Tenant Architecture
The Software as a Service Maturity Model
Choosing a Maturity Level
High-Level Architecture
Metadata Services
Security Services
Authentication
Authorization
A Closer Look: Multi-Tenant Data Model
Scalability
Operational Structure
Shared Services
Monitoring
Conclusion
Acknowledgements
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