Contemporary SOA is intrinsically reliant on Web servicesso much so that Web services concepts and technology used to actualize service-orientation have influenced and contributed to a number of the common SOA characteristics we identified in Chapter 3. An understanding of SOA therefore begins with a close look at the overall framework that has been established by the first and second-generation Web services extensions.
We can categorize concepts provided to us by these specifications into the following two groups:
This chapter kicks things off with an introductory overview of the concepts of the first-generation Web services framework as related to the realization of primitive SOA characteristics.
The framework we've assembled here consists of terms and concepts derived from a number of open specifications, including WSDL, SOAP, and UDDI. If you are already comfortable with these technologies and concepts relating to Web services in general, you can skip ahead to Chapter 6.
In Plain English sections
For those not yet familiar with the topics covered by this chapter, we provide the In Plain English sections. Their purpose is to convey the most fundamental concepts behind specific topics by providing intentionally simplistic, non-technical analogies. If you are new to the world of Web services, these sections will hopefully provide some extra clarity.
How case studies are used: We introduce the Web services-enabled portions of the RailCo and TLS solution environments and highlight specific parts of these applications to demonstrate some key concepts.
Part I: SOA and Web Services Fundamentals
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
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
Appendix A. Case Studies: Conclusion