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CHAPTER 4 CONFIGURATION AND DEPLOYMENT
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that you have to specify the SAO assemblies strong names in the configuration file in this case. This is normally not recommended if your server-side DLL is just used by a single application, but is needed to provide versioning services for CAOs, as you ll see in 8.
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Before being able to convert the former example to IIS-based hosting, you have to create a new directory and an IIS virtual directory called MyServer (this will be used in the URL to the remote objects) according to the description previously given. In the Internet Services Manager MMC, access the properties by right-clicking the newly created virtual directory, choosing the Directory Security tab, and clicking Edit. The window shown in Figure 4-20 will open, enabling you to set the allowed authentication methods. Make sure that Allow Anonymous Access is checked.
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Figure 4-20. Configuring authentication methods
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In the configuration file, it s important that you don t specify an application name, as this property will be automatically determined by the name of the virtual directory.
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Note When specifying channel information in a configuration file that will be used in IIS for example, to
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provide a different sink chain be sure not to include port numbers, as they will interfere with IIS s internal connection handling. When the server s load reaches a certain point, IIS may start more than one instance for handling a remote object. If you have bound to a secondary port in your configuration file, this port will already be locked by the previous instance.
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CHAPTER 4 CONFIGURATION AND DEPLOYMENT
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<configuration> <system.runtime.remoting> <application> <service> <wellknown mode="Singleton" type="Server.CustomerManager, Server" objectUri="CustomerManager.rem" /> </service> </application> </system.runtime.remoting> </configuration> After putting the configuration file in your virtual directory, you have to copy the assemblies (both the shared one and the server s implementation) into its bin subdirectory. The resulting structure should be like this:
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Directory
x:\<path_to_your_virtual_dir> x:\<path_to_your_virtual_dir>\bin
Contents
web.config Assemblies that contain your remote objects and assemblies upon which your objects depend if they are not in the GAC
The client is basically the same as in the previous examples. I use a shared interface approach and reference the assembly in which it is contained. The client itself is quite simple, as shown in Listing 4-14. Listing 4-14. An Anonymous Client using using using using System; System.Runtime.Remoting; General; // from General.DLL Server; // from server.cs
namespace Client { class Client { static void Main(string[] args) { String filename = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile; RemotingConfiguration.Configure(filename); IRemoteCustomerManager mgr = (IRemoteCustomerManager) RemotingHelper.CreateProxy(typeof(IRemoteCustomerManager)); Console.WriteLine("Client.Main(): Reference to CustomerManager " + "acquired");
CHAPTER 4 CONFIGURATION AND DEPLOYMENT
Customer cust = mgr.GetCustomer(4711); int age = cust.GetAge(); Console.WriteLine("Client.Main(): Customer {0} {1} is {2} years old.", cust.FirstName, cust.LastName, age); Console.ReadLine(); } } } In contrast to the examples earlier in this chapter, the client s configuration file needs to be changed to contain the correct URL to the newly deployed components. <configuration> <system.runtime.remoting> <application> <client> <!-- This entry only works with the RemotingHelper class --> <wellknown type="General.IRemoteCustomerManager, General" url="http://localhost/MyServer/CustomerManager.rem" /> </client> </application> </system.runtime.remoting> </configuration>
Debugging in IIS
To debug your server application in IIS, you could follow the same approach presented earlier for the Windows service. You could select Debug Processes and manually attach the debugger to the ASP .NET worker process (aspnet_wp.exe or w3wp.exe, depending on the OS). There is, however, an easier but not very obvious solution to debugging your remoting server inside of IIS. In essence, you have to trick Visual Studio .NET into attaching itself automatically to the ASP .NET worker process. To do this, you add a new ASP .NET Web Application Project to your solution. This project will host your remoting configuration information and server-side assemblies. In this project, you can add the <system.runtime.remoting> section to your web.config file as discussed previously. To add server-side implementation and interface assemblies, you just have to reference them using the Add Reference dialog box. These will be automatically deployed to the correct subdirectory. You must not delete the default WebForm1.aspx, as this will be used by Visual Studio to start the debugger. Now as soon as you hit F5, VS .NET will open an Internet Explorer window that displays this empty WebForm1.aspx. You can ignore this IE window, but you must not close it as this would stop the debugger. Instead, you can go to your server-side implementation code in VS .NET and simply set breakpoints, view variables, and so on as if you were running in a normal remoting host.
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