Web Services and Contemporary SOA (Part II: Advanced Messaging, Metadata, and Security)

Web Services and Contemporary SOA (Part II Advanced Messaging, Metadata, and Security)

In Chapter 6 we established a series of composition and activity management concepts, each with a different scope and purpose, but all somewhat related within the context of composable SOA. Those initial concepts are complemented by additional WS-* extensions that govern specific areas of the SOAP messaging framework, the creation and exchange of metadata, and the introduction of message-level security. (Figure 7.1 introduces the individual concepts and shows how they typically inter-relate.)

Figure 7.1. Specifications and concepts covered in this chapter.

As we explore the various extensions in this chapter, it becomes increasingly clear that SOAP messaging is the lifeblood of contemporary service-oriented architecture. It realizes not only the delivery of application data, but also the composable nature of SOA. The innovation of SOAP headers accounts for almost all of the features covered in Chapters 6 and 7.

To demonstrate common concepts, this chapter borrows terms provided by the following current Web services specifications:

  • WS-Addressing
  • WS-ReliableMessaging
  • WS-Policy Framework (including WS-PolicyAttachments and WS-PolicyAssertions)
  • WS-MetadataExchange
  • WS-Security (including XML-Encryption, XML-Signature, and SAML)
  • WS-Notification Framework (including WS-BaseNotification, WS-Topics, and WS-BrokeredNotification)
  • WS-Eventing

As with Chapter 6, we only explore concepts related to WS-* extensions in this chapter. Language element descriptions and examples for the first five specifications in the preceding list are provided in Chapter 17.


Markup code examples for WS-Eventing and the WS-Notification framework are not provided. These two specifications provide different languages that cover much of the same ground and are more relevant to the subject matter in this book on a conceptual level.


In Plain English sections

This chapter also contains In Plain English sections for every primary concept discussed. Note that these intentionally simplistic analogies continue where they left off in Chapter 6.


How case studies are used: Several of the examples in Chapter 6 are revisited here as we take a closer look at how interaction among specific TLS Web services is affected by the new concepts introduced in this chapter.


Case Studies

Part I: SOA and Web Services Fundamentals

Introducing SOA

The Evolution of SOA

Web Services and Primitive SOA

Part II: SOA and WS-* Extensions

Web Services and Contemporary SOA (Part I: Activity Management and Composition)

Web Services and Contemporary SOA (Part II: Advanced Messaging, Metadata, and Security)

Part III: SOA and Service-Orientation

Principles of Service-Orientation

Service Layers

Part IV: Building SOA (Planning and Analysis)

SOA Delivery Strategies

Service-Oriented Analysis (Part I: Introduction)

Service-Oriented Analysis (Part II: Service Modeling)

Part V: Building SOA (Technology and Design)

Service-Oriented Design (Part I: Introduction)

Service-Oriented Design (Part II: SOA Composition Guidelines)

Service-Oriented Design (Part III: Service Design)

Service-Oriented Design (Part IV: Business Process Design)

Fundamental WS-* Extensions

SOA Platforms

Appendix A. Case Studies: Conclusion

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Service-Oriented Architecture. Concepts, Technology, and Design
Service-Oriented Architecture (SOA): Concepts, Technology, and Design
ISBN: 0131858580
EAN: 2147483647
Year: 2004
Pages: 150
Authors: Thomas Erl
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