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The previous examples are meant to provide a sneak preview of the WCF programming look and feel. Of course, WCF provides many more features and so this is by no means an exhaustive look at WCF programming. To help fill some gaps, Table 9-3 lists several important features and which WCF API or attribute enables each one. Use this as a self-study starting point. Table 9-3. Other WCF Features
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Attribute or API
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OperationBehaviorAttribute ServiceBehaviorAttribute
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Provides AutoEnlistTransaction parameter InstanceMode parameter accepts values such as PerCall, Singleton, etc. Both provide parameters for declaring an asynchronous task and a valid callback interface on the client. Sends message to queues.
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Message Queuing
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Preparing for WCF
WCF and SO represents a huge shift both in how we reason about distributed applications and how we implement them. The benefits, however, are significant, so it s no wonder that architects and developers are anxious to adopt WCF as soon as possible. On the other hand, most of these folks also have systems that need to be developed today using today s technologies and, therefore, they cannot afford to wait for Microsoft to release WCF. So the question on
CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
everyone s mind then is, What can I do today to make the future migration to WCF easier In particular, you need to know which of the Big Four technologies to choose and what features of the chosen technology you should use or avoid. To answer this question, we must break it down into three more specific questions: 1. Will installing WCF break my application because it uses a particular Big Four technology 2. Will my chosen Big Four technology interoperate with WCF services 3. Will my chosen Big Four technology easily port to WCF This section discusses each of these questions as it applies to each of the Big Four technologies.
Will WCF Break My Current Application
Of the three, this is probably the most important question. It also has the most welcomed answer: WCF will not break an existing application using any of the Big Four technologies. WCF will be deployed as an entirely distinct technology with its own protocol stacks and, therefore, it neither changes nor depends on anything from the Big Four stacks. This is great news, particularly for folks who have already heavily invested in current technologies. It also contradicts some of the talk around .NET Remoting, a technology that should steal a famous line from Mark Twain: The rumors of my death have been greatly exaggerated. Although it s true that Remoting presents some issues in terms of porting to and interoperating with WCF, like all the other Big Four technologies it will continue working as normal after you install WCF.
Will My Implementation Interoperate with WCF
As we stated in the previous section, all of the Big Four technologies are equal in that they won t break after you install WCF. In terms of interoperating with WCF, however, the Big Four technologies are clearly not equal; most interoperate, but one simply does not. Before getting to that detail, however, let us clarify the question. Each of the Big Four relies on a distinct stack of protocols that define serialization, wire format, object lifetime semantics, and so on. It should be no surprise, therefore, that these technologies generally do not interoperate well. For example, a Web Service cannot directly communicate with a .NET Remoting object or vice versa because (among a few other issues) it accepts and sends different message formats across the wire. However, since WCF incorporates the best of each Big Four technology, it achieves wire interoperability with three of the Big Four technologies. The one exception is .NET Remoting. Some, unfortunately, have misinterpreted this to mean that WCF breaks Remoting. In reality, it simply means that your existing Remoting code will not communicate with your new WCF-based services (and vice versa). This is certainly an important limitation that you ll need to consider carefully before you adopt a solution based on .NET Remoting. That said, it doesn t signal the death of .NET Remoting. Remoting aside, the overall WCF interoperability story is outstanding. It does achieve wire interoperability with your current Enterprise Service, MSMQ, and .NET Web Service code. In addition, WCF services can interoperate with any non-.NET Web Service if it conforms to the WS-I Basic Profile specification.
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