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The .NET Remoting system enables you to access .NET Framework objects across the boundaries of AppDomains. It represents the actual implementation of a programming 452
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model designed for interprocess communication. Another facet of this model is .NET XML Web services. Although .NET XML Web services allow you to expose .NET Framework objects to any client that can use HTTP, .NET Remoting is optimized for .NET-to-.NET communication. Communication between the client and the remotable object can take place using SOAP or binary payloads transported over HTTP or TCP. .NET Remoting can transfer any serializable CLR types; it is not limited to XML Schema Definition (XSD) types or complex custom types as rendered by the .NET XML serializer. This chapter illustrated the key features of the .NET Remoting system and showed you how to set up a remotable object that exposes nontrivial functionalities. In particular, you learned how to expose JPEG images through XML documents. Of course, if the goal of your distributed system is simply to create and return dynamic images, .NET Remoting might not be for you. But from a broader standpoint that encompasses Web services, .NET Remoting not only makes sense, it is also compelling. The example we've constructed in this chapter has two aims. First, it demonstrates that .NET Remoting and Web services are just two remoting interfaces and that the same core class can outfit both. Second, it shows that to come up with truly efficient and effective code, you must always take the most appropriate route and create specialized code instead of pursuing the promises of code universality and platform independence. This chapter covered only the first side of remoting .NET Remoting for CLR types. In 13, we'll look at Web services a truly interoperable infrastructure ideal for rolling up your functionalities and making them available to a potentially infinite set of clients.
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Although this chapter touched on all the key aspects of the .NET Remoting technology, it revealed only the tip of the iceberg. Throughout the chapter, I've noted several aspects of .NET Remoting whose coverage was simply beyond the scope of a book about XML. Principal among the resources that cover these topics in more detail is the MSDN .NET Framework documentation, but many other appropriate resources are also available. I mentioned that Windows XP and newer systems boast a modified loader that looks directly into the source Portable Executable (PE) file to find .NET Framework-specific metadata. To understand the entire loading process of managed executables in Windows XP as well as in Windows 2000, I know just one resource: Jeffrey Richter's excellent book Applied Microsoft .NET Framework Programming (Microsoft Press, 2002). In the October 2002 issue of MSDN Magazine, you can find an article of mine that, like this chapter, attempts to explain the ABCs of .NET Remoting. In that article, you'll find a deeper discussion of architectural aspects channels, formatters, and sink chains than we've covered here. The internal engine that performs memory management for instances of remote objects is the lease manager (LM). Jeff Prosise, in 15 of his book Programming Microsoft .NET (Microsoft Press, 2002), explains a lot about it. Finally, if you're just looking for a complete .NET Remoting book, here it is: Microsoft .NET Remoting, by Scott McLean, James Naftel, and Kim Williams (Microsoft Press, 2002).
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13: XML Web Services
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The term Web service is relatively new, but the idea behind Web services has been around for a while. A Web service is an interface-less Web site designed for programmatic access. This means that instead of invoking URLs representing Web pages, you invoke URLs that represent methods on remote objects. Similarly, instead of getting back colorful and animated HTML code, you get back XML Schema Definition (XSD) data types packed in XML messages. Aside from these higher-level differences, the underlying models for a Web site and a Web service are the same. In addition, any security measure you can implement on a Web site can be duplicated in a Web service. To summarize, the Web service model is just another programming model running on top of HTTP. A Web service is a software application that can be accessed over the Web by other software. Web services are applicable in any type of Web environment, be it Internet, intranet, or extranet. All you need to locate and access a Web service is a URL. In theory, a number of Internet-friendly protocols might be working through that URL. In practice, the protocol for everyday use of Web services is always HTTP. How is a Web service different from a remote procedure call (RPC) implementation of distributed interfaces For the most part, a Web service is an RPC mechanism that uses the Simple Object Access Protocol (SOAP) to support data interchange. This general definition represents the gist of a Web service, but it focuses only on the core behavior. A Web service is more than just a business object available over an HTTPaccessible network. A number of evolving industry standards are supported today, including the Universal Description, Discovery, and Integration (UDDI) standard and the Web Services Description Language (WSDL); others, such as the Web Services Security (WS-Security) and the Global XML Web Services Architecture (GXA), will be supported soon. These industry standards contribute to setting up a full and powerful environment for remote object-oriented access and programming. In this chapter, we'll look at implementing and programming Web services in the Microsoft .NET Framework. We'll also take a look at the Web infrastructure that makes these services available and at the functionalities you can obtain and publish. To demonstrate the breakthrough that Web services represent in the software industry, we'll rewrite the .NET Remoting code example from 12 to make it work as a Web service. In doing so, we'll also be able to examine the differences between the .NET Remoting and Web service architectures and determine in which scenarios each architecture is suitable.
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