.net qr code generator sdk Implementing the Server in VB.NET

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Implementing the Server
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On the server you need to provide an implementation of ICustomerManager that will allow you to load a customer from a fictitious database; in the current example, this implementation will only fill the Customer object with static data.
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CHAPTER 2 .NET REMOTING BASICS
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Note To create concise samples, I will present throughout the book mostly console applications that focus
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on demonstrating one single aspect of .NET Remoting at a time. Using console applications as servers, however, is not recommended in production environments, and I ll discuss the more serious hosting options (Windows services and Internet Information Server) in 4. It s important to note that you can still use all the demonstrated techniques no matter which host you choose it s just that console applications are easier to use as a tool to explain concepts.
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To implement the sample server, you create a new console application in Visual Studio .NET called Server and add a reference to the framework assembly System.Runtime.Remoting.dll and the newly compiled General.dll from the previous step (you will have to use the Browse button here, because you didn t copy the assembly to the global assembly cache [GAC]). The server will have to access the namespace General and System.Runtime.Remoting plus a remoting channel, so you have to add the following lines to the declaration: using using using using System.Runtime.Remoting; General; System.Runtime.Remoting.Channels; System.Runtime.Remoting.Channels.Http;
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As described previously, you will have to implement ICustomerManager in an object derived from MarshalByRefObject. The method GetCustomer()will just return a dummy Customer object: class CustomerManager: MarshalByRefObject, ICustomerManager { public CustomerManager() { Console.WriteLine("CustomerManager.constructor: Object created"); } public Customer GetCustomer(int id) { Console.WriteLine("CustomerManager.GetCustomer(): Called"); Customer tmp = new Customer(); tmp.FirstName = "John"; tmp.LastName = "Doe"; tmp.DateOfBirth = new DateTime(1970,7,4); Console.WriteLine("CustomerManager.GetCustomer(): Returning " + "Customer-Object"); return tmp; } } It still looks more or less the same as a conventional nonremoting class would the only difference is that the class doesn t inherit directly from System.Object, but from System.MarshalByRefObject. Now let s have a look at the server startup code. This is a very basic variant of registering a server-side object. It doesn t yet use a configuration file, but the server s parameters are hard coded in void Main().
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CHAPTER 2 .NET REMOTING BASICS
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class ServerStartup { static void Main(string[] args) { HttpChannel chnl = new HttpChannel(1234); ChannelServices.RegisterChannel(chnl); RemotingConfiguration.RegisterWellKnownServiceType( typeof(CustomerManager), "CustomerManager.soap", WellKnownObjectMode.Singleton); // the server will keep running until keypress. Console.ReadLine(); } } Now take a closer look at the startup sequence of the server: HttpChannel chnl = new HttpChannel(1234); A new HTTP channel (System.Runtime.Remoting.Channels.Http.HttpChannel) is created and configured to listen on port 1234. The default transfer format for HTTP is SOAP . ChannelServices.RegisterChannel(chnl); The channel is registered in the remoting system. This will allow incoming requests to be forwarded to the corresponding objects. RemotingConfiguration.RegisterWellKnownServiceType( typeof(CustomerManager), "CustomerManager.soap", WellKnownObjectMode.Singleton); The class CustomerManager is registered as a WellKnownServiceType, which allows the client to remotely call its methods. The URL will be CustomerManager.soap whereas this can be any string you like, the extension .soap or .rem should be used for consistency. This is absolutely necessary when hosting the components in IIS as it maps these two extensions to the .NET Remoting Framework (as shown in 4). The object s mode is set to Singleton to ensure that only one instance will exist at any given time. Console.ReadLine(); This last line is not directly a part of the startup sequence but just prevents the program from exiting while the server is running. You can now compile and start this server.
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Note If you look closely at the startup sequence, you ll notice that the registered class is not directly
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bound to the channel. In fact, you d be right in thinking that all available channels can be used to access all registered objects.
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