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CHAPTER 6 SOA IN .NET: WEB SERVICES
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<system.xml.serialization> <schemaImporterExtensions> <add name="Library" type="Library.LibraryImporterExtension, Library, Version=... </schemaImporterExtensions> </system.xml.serialization> Now, when the client adds a Web Reference to a service returning an instance of BookCollection, you use your own type to control the collection s markup on the wire, and have type affinity at the client, with a fully restored instance of the book cover stored in the BookImage property.
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There are a handful of other enhancements to the ASMX infrastructure in ASP .NET 2.0. These include an attribute-based approach to enforcing conformance with the WS-I Basic Profile, a simplification of the asynchronous invocation model, and the ability to use a Windows Forms application as a host for receiving Web Service requests, which is convenient when you need a call back infrastructure, or for an event-based one-way messaging scenario. Consult the SDK docs for more details on these features.
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The need to solve problems of interoperability across platforms doesn t stop once you agree on public specifications and create them. Even with industry-wide adoption of the WS-I group s Basic Profile (as we ve discussed), major hurdles need to be overcome to facilitate compatibility across languages, platforms, and Enterprises. Many common business problems still loom. The obvious ones are security and transaction management. But there are many other problems. How can binary information be packed away into an XML document in a standard format How can a message be routed across several network endpoints Do you always need to write code to determine Web Service behavior The WS-* specifications solve these requirements in a standard manner. These specifications dictate common SOAP headers you can use to address these different concerns. By standardizing on the structure of the SOAP header for a given problem, different companies can exchange security information in a common wire format, while also processing these credentials against their back-end user data stores in proprietary ways. In a secure system, someone is always going to have to send you credentials for access to your system. The question becomes how does that information get sent What exactly do you expect it to look like Without a specification for this and other common problems, you d have interoperability, in theory, but everyone would have to reinvent the wheel (and do some custom coding) to accommodate the security descriptors of different partners, or divisions, or departments. Another benefit of a standards-based approach to solving these problems is that you can leverage a vendor-supplied implementation of the specification. This saves you from writing any custom code at all. You can just extend your SOAP Stack with a package from a vendor that provides the code for the requirements you need. This is where Microsoft s Web Service Enhancements (WSE) package comes into the picture.
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CHAPTER 6 SOA IN .NET: WEB SERVICES
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WSE is an add-on package for the Windows operating system. It s available as a free download from Microsoft. The group that provides WSE isn t tied to any product or release schedule, so, for example, it doesn t have to wait until the next version of Visual Studio ships to provide a new version of its functionality. This is intentional, so that the group can respond to and provide implementations of new specifications as they become available from the various standards bodies involved in inventing these things. WSE 3.0 will contain features specifically designed to leverage version 2.0 of the .NET Framework. See http://msdn.microsoft.com/ webservices/building/wse for the most current version information.
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We ll take a quick look at some of the WS-* specifications that are met by the current version of WSE, and examine a little bit about how it fits into the ASMX SOAP Stack. Keep in mind that as these standards evolve, WSE will provide new and current implementations. Most of the implementations of these specifications are provided as Pre and Post request processors that extend the default ASMX pipeline. This concept is very similar to the concepts we discussed in 2 about the ASP .NET pipeline. The big difference in the case of Web Services (see Figure 6-21) is that request processing needs to be extended on both the server (similar to ASP .NET) and on the client (no equivalent in ASP .NET). Requests for Web Forms come in from web browsers. Requests for services come in from Web Service proxies.
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Figure 6-21. Extensions to the Web Service processing pipeline This doesn t mean that the implementations provided by WSE are .NET-specific. On the contrary, they re more interoperable than any custom solution would be, as they re based on public specifications that other vendors can implement for other platforms. This means that WS-Security can be used from a .NET client to a J2EE server, or it can be used from a J2EE client and a .NET Server (see Figure 6-22).
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