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Additional resources for Advanced .NET Remoting (C# Edition)
As you can see in Listing 3-5, the activation of the remote object is done with the new operator. This is possible because you registered the Type as ActivatedClientType before. The runtime now knows that whenever your application creates an instance of this class, it instead should create a reference to a remote object running on the server. ReadLine(); } } } When this code sample is run, you will see the same behavior as when using local objects-the two instances have their own state (Figure 3-9).
Unfortunately, when your client is behind an HTTP proxy and is accessing your objects using SOAP remoting, the server will not be able to contact the client in any way. This constraint leads to a new kind of lifetime service: the lease-based object lifetime. Basically this means that each server-side object is associated with a lease upon creation. This lease will have a time-to-live counter (which starts at five minutes by default) that is decremented in certain intervals. In addition to the initial time, a defined amount (two minutes in the default configuration) is added to this time to live upon every method call a client places on the remote object.
The server's startup code is quite straightforward and works the same as in the preceding examples. It opens an HTTP channel on port 1235 and registers the well-known object. This second server is shown in Listing 3-21. SingleCall); // the server will keep running until keypress. ReadLine(); } } } Chapter 3: Remoting in Action 53 54 Chapter 3: Remoting in Action Note When running two servers on one machine, you have to give the servers different port numbers. When developing production-quality applications, you should always allow the user or system administrator to configure the port numbers in a configuration file, via the registry or using a GUI.