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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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Finally, WCF can also interoperate with a Web Service that uses Web Service Enhancements (WSE) for WS-Security, WS-Policy, and other new Web Service specifications. This WSE interoperability, however, comes with one big caveat: It is true for WSE version 3.0 only. To keep up with the dynamic nature of the Web Service specification space, Microsoft must constantly produce updated versions of their WSE tool. Because of this, the WCF team decided to target a WSE version that, hopefully, contains a much more stable set of specifications.
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How Easily Will my Application Migrate to WCF
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Like the interoperability question, this question also helps to distinguish the current Big Four technologies. The answer to the ease of migration question centers on the programming model; if your current technology uses a programming model based primarily on declarative attributes rather than code, it will be easier to port the code to WCF. Before diving into the details for each technology, however, let us address another question that has likely crossed your mind. Given WCF s great interoperability story, why would you endure the hassle of migrating a Web Service that has proven to be reliable and functional The answer, simply, is that migrating allows you take full advantage of all the WCF capabilities. WCF is built upon the latest and greatest protocols, brings SO to the masses, and provides a single, simple programming model. But migrating existing code to WCF is the only way to realize all of its functionality. The following sections discuss the migration details of each Big Four technology and give each a rating of either trivial or non-trivial where: Trivial means that the required changes are simple and can be expressed in a cookbook-style document or can be reliably automated via a tool. Non-trivial means that the required changes are generally too complex for reliable automation and, therefore, require human intervention. In the non-trivial cases, Microsoft intends to publish whitepapers to help guide developers through the migration process. Also understand that even in these non-trivial cases, a little WCF foreknowledge can help you implement solutions with WCF in mind and, thus, ease that migration. To that end, in each of the following sections we provide usage suggestions that will minimize your migration task.
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Not surprisingly, Web Services are easily migrated to WCF. This is true for a couple reasons. First, the .NET Web Service programming model is based primarily on attributes rather than code. Second, the underlying protocols and standards already support, if not embrace, a service-oriented mindset. Because of this, Web Services enjoy a trivial migration. That said, if you re writing a Web Service today but know it will eventually be ported to WCF, here are a few suggestions for ensuring a seamless transition.
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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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Avoid or abstract custom SOAP extensions. SOAP extensions enable you to intercept incoming and outgoing SOAP messages and execute custom logic before the message lands within the Web Service or at the client. This can be useful when you re implementing a custom security mechanism, custom logging, etc. However, WCF provides its own interception and extensibility mechanism, so all SOAP extensions must be rewritten as WCF behaviors or channels. Avoid or abstract calls to HttpContext. The HttpContext class provides access to the intrinsic ASP .NET objects such as Session, Application, and Server. You can rely on this to work because .NET Web Services are always hosted in ASP .NET. However, WCF services may run within several types of hosts, including a simple console application. So you can no longer assume the WCF service is hosted by ASP .NET and, therefore, has an HTTP context. Currently, WSE 2.0 is a popular way to provide security and other required enterprise abilities to Web Services. Unfortunately, Web Services that leverage WSE 2.0 experience a decidedly non-trivial migration path. In fact, Microsoft warns that it may cost significant developer time. This is a particularly problematic given that WCF also doesn t support wireinteroperability with WSE 2.0 either. The good news, however, is that the port from WSE 3.0 to WCF should be trivial. So if you use WSE 2.0, be prepared to migrate to WSE 3.0 as soon as possible to provide a much smoother path to WCF.
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