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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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A matching sender application that can send notifications to multiple receivers could, for example, look like this: using using using using System; System.Text; System.Collections; System.Messaging;
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class Sender { static void Main(string[] args) { Console.Write("Enter String to broadcast:"); String str = Console.ReadLine(); ArrayList clients = new ArrayList(); clients.Add("localhost"); clients.Add("client1"); clients.Add("client2"); String formatName = BuildFormatName(clients); MessageQueue que = new MessageQueue(formatName); Message msg = new Message(); msg.Formatter = new BinaryMessageFormatter(); msg.Body = str; que.Send(msg); Console.ReadLine(); } static string BuildFormatName(ArrayList clients) { if (clients.Count == 0) throw new ArgumentException("List of clients empty.", "clients"); StringBuilder bld = new StringBuilder(); bld.Append("FormatName:"); foreach (String cli in clients) { bld.Append("direct=os:"); bld.Append(cli); bld.Append("\\private$\\NOTIFICATIONS"); bld.Append(","); } bld.Remove(bld.Length-1,1); return bld.ToString(); } }
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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In this example, the method BuildFormatName() takes a list of clients that should receive the notification and builds a destination name containing all the individual queues. If you don t want to hard code the queue names on the client side (for example, if multiple instances of your application can be started on one host), it is advisable to create a new queue upon application startup, giving it a random or GUID-based name. You would then contact the server (by either using MSMQ or maybe also using .NET Remoting) to have it add the newly created queue to its list of subscribers. You would then also have to include mechanisms for unsubscribing, deleting the dynamically created queues, and detecting stale entries in the list of subscribers.
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Delivering notifications to a large number of clients is a very complex topic for which a number of additional strategies have been developed depending on the usage scenario. An approach not discussed previously is, for example, the use of TCP connections that have been created by a client solely for the purpose of allowing a server to use it for notifications. Point-to-point UDP connections and HTTP-based polling are other approaches that might be necessary depending on the number and kinds of clients your application should support.
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Whenever people have approached me in the previous years to ask for my opinion on SoapSuds, I have been recommending using interfaces to access remote objects instead. My exact words might even have been close to I d generally recommend avoiding SoapSuds whenever possible. The idea behind SoapSuds is to run it on an existing assembly to extract the metadata for all MarshalByRefObjects so that you don t need to deploy the complete implementation assembly to your clients. This goal is pretty ambitious, and in fact, I truly believe that it just can t work. As soon as you have [Serializable] or ISerializable classes in your assembly, you are pretty much on your own because SoapSuds will only extract the metadata (i.e., the fields) but not the implementation. Even if it would extract the implementation, this might also not match your expectation because it might contain source code that should only run on the server side. Just imagine that you have a class like this: [Serializable] public class Foo { private String _bar; public String Bar { get { return _bar; } set { if (value.Length > 30) { throw new ApplicationException( "Bar might not be longer than 30 chars");
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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} _bar = value; } } } When running SoapSuds here, it will extract only the metadata, which basically leaves you with the following class, which is quite a bit different: [Serializable] public class Foo { public String Bar; } But even if you can work around this issue (by including your [Serializable] classes in a different assembly that is shared between server and client), you might still run into some issues. As soon as your application increases in complexity, you encounter one or more of the following problems, depending on the version of the .NET Framework and its service packs: Typed DataSets are not supported by SoapSuds. If you use System.ComponentModel.Component (and some others), SoapSuds will simply throw an exception instead of generating anything. Various conditions trigger the generation of non-compilable code (duplicate using statements in a file, and so on). Async calls via Delegate.BeginInvoke() won t work. One of the reasons for using SoapSuds is the ability to register these metadata-only classes at the client side so that you can basically use the new operator to instantiate remote references. But at the end of the day, location transparency as it is implied in this case might even turn out to be dangerous for an application s stability. It can affect your application s performance in negative ways (for example, when using way too chatty interfaces). Normally, you should know exactly which method will be executed remotely and which class will run in a remote context therefore my conclusion: Use explicitly defined remote interfaces. Use a helper class like the one shown here if you want to go with configuration files. Use factory SAOs instead of CAOs ( activated types don t work with interfaces, therefore, factory). Or even better: avoid CAOs if possible, especially if your application should support transparent failover on a cluster. Let me give you one more reason why I definitely advocate the use of explicit interfaces to access remote objects. Just imagine that you inherit client-side code written by someone else and you see code like the following. private double CalculateSum(Order o) { double sum = 0; foreach (OrderDetail od in o.Details)
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