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Interoperability and Migration Summary
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You ve now seen how the Big Four technologies compare in terms of interoperability and migration and how to best utilize each for the smoothest path to WCF. You can find a convenient summary of the key facts in Table 9-4.
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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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Table 9-4. WCF Interoperability and Migration Summary
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Web Services WSE 2.0 WSE 3.0 Enterprise Services .NET Remoting System.Messaging (MSMQ)
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Interop with WCF
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Yes No Yes Yes No Yes
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Trivial Non-trivial Trivial Non-trivial Non-trivial Non-trivial
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Overall Guidance for Choosing the Best Technology
One Big Four technology stands out as providing the best migration path to WCF: Web Services. This is true not only for simply migrating code, but also more importantly for migrating your frame of mind from objects to services. The best way to understand SO is to do service orientation, and Web Services allow you to do just that right now. If you re currently using WSE 2.0, plan to migrate to WSE 3.0 as soon as possible. This will provide interoperability with WCF and a simpler migration path to WCF. While the above is the recommended approach straight out of Redmond, no one including Microsoft is foolish enough to believe that one technology is always the right answer for every situation. For example, some applications may have performance requirements that a Web Service-based solution cannot meet. Or the situation may require distributed transactions or involve a proprietary protocol. For all these reasons and more, the other technologies still play important roles. If Web Services are ruled out, particularly for performance reasons, Enterprise Services is the next recommended technology. Enterprise Services use DCOM as the communication protocol, which, somewhat surprisingly, remains the fastest distributed wire protocol faster even than .NET Remoting over the network. Enterprise Services also provide critical services such as distributed transactions, object pooling, and a proven hosting environment. However, Enterprise Services is currently built upon COM+ technology. This may seem like a minor detail except that it leaks through the Enterprise Service abstraction in serious ways. For example, all Enterprise Service assemblies must be strong named, and configured within COM+. So that brings us to .NET Remoting, which performs extremely well when using binary serialization with the TCP protocol. In fact, it s actually faster than DCOM when communicating between application domains within a single process. It s also a pure managed code solution that doesn t suffer from registration and deployment hassles like Enterprise Services. Finally, .NET Remoting allows you to get extremely close to the underlying wire protocols. So much so that you can use .NET Remoting to implement or interact with a proprietary wire protocol. The downside, however, is that Remoting is strongly biased toward distributed object approaches, which can potentially make your code difficult to migrate into WCF. Because of this and because Remoting is not wire interoperable with WCF, it s recommended to use it only for cross-application domains, in process calls, or when you need to implement custom protocols.
CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
Compared to the other three technologies, the decision to use MSMQ is a simple one. If you need robust messaging with guaranteed delivery, transacted queues, built-in security, and more, you must use MSMQ because it s the only current Microsoft technology that provides these features.
Summary
WCF is a future technology that promises to unify the current distributed technologies under one programming model and technology stack. It also promises to bring SO to the mainstream. Microsoft has already released and continues to release a large amount of WCF-related information. This is a testament to the impact it s expected to have. Of all the current .NET distributed technologies, Web Services will enjoy the easiest transition to WCF. The migration story for the rest of the Big Four is a mixed bag. However, the best way to ensure a smooth migration path is to learn everything you can about SO and apply its ideas now to guide how you build a distributed application.
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