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As you ll see in 9, ASP .NET will also be the hosting environment of choice for services created using Microsoft s new unified out-of-process class stack named Windows Communication Foundation (WCF). While this won t be your only choice for hosting WCF services, it will be the path of least resistance choice as WCF is being designed from the ground up to be a first-class (and well-behaved) citizen within ASP .NET.
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Windows XP and Windows Server 2003 add the option of exposing Component Services directly via SOAP This SOAP Stack is implemented as another IIS application that acts as a . dedicated listener for SOAP requests and maps them to your COM+ application. This technology is not limited to .NET. It can be used to expose your Enterprise Services (.NET types that
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CHAPTER 8 HOSTING AND COMMUNICATIONS
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inherit from ServicedComponent; see 7), but also can be used to expose Component Services written in a COM language. If your COM+ application is written with a COM language, interop assemblies are automatically generated that act as a front end for the SOAP stack. Setting this up is very easy. The Activation tab of the property page of a COM+ application is displayed in Figure 8-1.
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Figure 8-1. The Activation tab of the property page of a COM+ application Notice we ve checked the Uses SOAP check box and provided a name for a virtual directory. When you click OK, Component Services does the rest of the work. A directory is created in the System32\COM\SOAPVRoots subdirectory within the Windows installation directory. This directory is automatically configured as an IIS application. The directory has a few files, but the important one is an automatically generated copy of a web.config, where the mapping of incoming SOAP requests to the type contained in Component Services is set up. For this to work, .NET types must be installed in the Global Assembly Cache (GAC). If a COM type is exposed via this method, interop assemblies will be generated and added to the bin subdirectory of this virtual directory. WSDL can be retrieved from this directory using fully qualified type names. For example, the ESDemoSOAP application you ve just exposed contains a number of types in the ESDemo namespace. On of them is a class named Poolable. These types are exposed via a handler that responds to requests for documents with a .soap extension. The general form is: http://servername/ApplicationName/Namespace.TypeName.soap Tacking on a query string of wsdl causes the handler to generated the WSDL document. The URL for the WSDL document of the type named JITA in the ESDemo namespace would be formed as: http://localhost/ESDemoSOAP/ESDemo.JITA.soap wsdl
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So a request for this URL causes the WSDL describing the type to be generated and returned, as displayed in Figure 8-2.
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Figure 8-2. The auto-generated WSDL describing a Serviced Component Any of the types in the application can now be exposed via a Web Service proxy. Now use the Add Web Reference feature of Visual Studio .NET to generate a proxy in your console application, as shown in Figure 8-3. And now you can use this type just like any other Web Service. In the following code you use a proxy to the Just-in-Time Activation (JITA) service (from the TestApp project in the Code08 solution): static void Main(string[] args) { Proxies.JITA j = new Proxies.JITA (); for (int i = 0; i < 10; i++) { DateTime t = j.GetCreateStamp(); Console.WriteLine(t); } } Furthermore, any platform supporting Web Services can now use it, too.
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CHAPTER 8 HOSTING AND COMMUNICATIONS
Figure 8-3. Adding a Web Reference to the Serviced Component
Stored Procedure SOAP
The SQLXML add-on for SQL Server exposes very similar functionality for stored procedures. This mechanism uses its own ISAPI application and is not dependent upon the .NET Framework. The tool will interrogate the schema of a Transact-SQL (T-SQL) Stored Procedure and automatically generate the WSDL to expose the procedure directly via SOAP See the SDK docs . on SQLXML for a walk-through of this functionality.
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