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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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A given policy may indicate a service capability (for example, I support transactions ) or a service requirement (for example, I require transaction support from other services ). In the case of WCF, each policy assertion adds the appropriate interceptor on both sides of the communication link. These interceptors actually apply the policy. Therefore, policy negotiation must occur before any real communication commences.
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Tenet Four: Services Are Autonomous
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Quite honestly, this tenet is probably the most nebulous one for developers as they learn the service-oriented concepts. In fact, of the four tenets, the majority of questions and discussions tend to focus on this one. The concept itself is simple to explain: services are self-governed and contain resources that cannot be modified by any external entity. The completely logical question that typically follows this, however, is the confusing aspect. That question is How practical is a service that is completely autonomous The answer, of course, is not at all. To help resolve this apparent contradiction, it s best to consider this tenet as a driving principle that a service should strive to achieve, rather than a hard and fast rule that a service must follow. In that sense, this tenet is similar to the encapsulation principle in object orientation. Total encapsulation would dictate that the object has no public members, which, of course, is a completely useless object. However, it still is an important principle that you should violate only when necessary. Likewise, you should use the autonomy principle to drive the design and factoring of your services. This will help you create services that are as independent, robust, and resilient to change as possible.
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Service Orientation vs. Service Oriented Architecture
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New technologies and development paradigms typically come attached with a barrage of new terminology, acronyms, and jargon. SO/A is no exception. To make things even more confusing, some terms are often lazily interchanged despite being different in subtle but important ways. But this is hardly unique to SO/A. In writings about object orientation, for example, the term object is often used where class would be more appropriate, or vice versa. The terms that are most confused in the service space are service orientation (SO) and Service Oriented Architecture (SOA). Service orientation refers to a mindset that centers on the four SO tenets. These principles can drive activities across the entire spectrum of development tasks: architecture, design, requirement gathering, and coding. In contrast, the term Service Oriented Architecture is more specific in that it refers to the activity of developing an architecture or can be used to describe and existing architecture. When the service notion first appeared within the developer world, it was commonly referred to as SOA. The problem with the SOA term, however, is that it implies that service orientation is simply an architectural approach. Therefore, the industry is slowly adopting SO as the generic term and using SOA in the context of discussing architectures.
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Programming with WCF
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While the previous sections paint a high-level picture of WCF, if you are anything like us, then a few lines of code speak a thousand words. So after providing you with an overview of some core WCF concepts, we ll show you several code examples that demonstrate the look and feel of programming WCF.
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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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Caution At the time of this writing, WCF has been released only as an early beta. Therefore, take all code
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examples with a pound of salt many of the details will likely change by the time WCF is officially released.
The ABCs of WCF: Address, Binding, and Contract
Concisely stated, a WCF service is a collection of endpoints where each endpoint implements a service contract and contains a binding and an address. Crystal clear, right Probably not, so in this section, we elaborate on this definition by illustrating what is meant by contracts, bindings, and addresses.
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