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CHAPTER 6 SOA IN .NET: WEB SERVICES
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irrelevant. What should be considered when the service is designed (and sometimes when the service is consumed) are the messages on the wire; how they are formed, what they contain, and how the information is described using XML Schema.
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Web Services as an SO Implementation
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Web Services are not the only way of providing an implementation of service orientation. They re just all the rage at the moment. The academics of service orientation actually predate Web Services by a long shot. The resurgence of service orientation as a viable architectural option has occurred on account of Web Services, and Web Services have surged in relevance on account of the World Wide Web. Everything is finally in place to do a proper implementation of SOA that s truly interoperable. This has been attempted before, but these attempts have been met with limited success. By piggybacking on the success of the Web, Web Services have a real chance of success. There s a lot of support for this technology from standards bodies and industry heavies, including Microsoft, Sun Microsystems, BEA, IBM, and Oracle. There s also a lot of effort going into solving the thorny problems of really making this solution interoperable. These efforts can be described under the umbrella of the WS-* initiatives. We ll take a look at some of these standards (see Table 6-1), and the .NET implementations of them. Many technologies provide the underpinnings of the infrastructure for Web Services. Table 6-1. Specifications and How They Play a Role in Web Services
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Specification
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Role in Web Services
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This specification for the flexible creation of markup is the underpinning of all the structures in use in Web Services. This is used for message format definitions, providing the common type system used by service provider and consumer. Different platforms will then employ their own methods of translating the information described by the schema into native types to work with programmatically. The XML document used for service description. This description defines the interface of the service. Given this description, service consumers have all of the information they need to call operations on the service. The XML Protocol specification defines the SOAP envelope as the fundamental structure used for passing messages at runtime. The specification describes the repository of XML used for publishing and discovery. This is an actual platform-specific implementation of a Web Service infrastructure. .NET has a SOAP Stack implemented within the ASP.NET Framework, based on ASMX pages (commonly called the As-Em-Ex stack).
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Many of the WS-* initiatives are owned by the WS-I (www.ws-i.org; the Web Services Interoperability Organization). The WS-I works to develop guidelines that facilitate interoperability between Web Services. Even if they adopt all of the standards listed in the Table 6-1, different organizations might adopt different versions of the different specifications, and this can introduce problems in interoperability. To further standardize the adoption of these standards, the WS-I has created the Basic Profile. By adhering to the Basic Profile, different parties (be they companies or different departments within an Enterprise) vastly increase their chances of successfully using one another s services. The Basic Profile employs the Web Service stack
CHAPTER 6 SOA IN .NET: WEB SERVICES
(see Figure 6-2), which determines the version of each specification in use at every level of the Web Service infrastructure, from discovery down to the format of the message on the wire at runtime.
Figure 6-2. The WS-I Basic Profile service stack You can see this profile just adds a version qualifier to each level of the stack. This service stack is different from a SOAP Stack because it provides another layer of specification, whereas a SOAP Stack is an actual implementation of the specifications, and generally involves tools and processes that are used during design and at runtime. Because more developers are more familiar with traditional OOAD concepts than with service orientation, it can help to liken the two, albeit analogously, as we do in Table 6-2. Table 6-2. Service Orientation Analogies to Traditional OOAD
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