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}return Instance;/// /// Makes a (possibly remote) Directory Facilitator availableon this computer./// This method is required because C# does not support staticinitialization/// blocks./// There is no need to call this method explicitly if theplatform on the/// main host is started first./// public static void Install(){if (Instance != null) return; // Already installedif (Middleware.ProcessIsMainHost())InstallServer();elseInstallClient();}host./// /// Current process is not main host: get proxy to DF on main/// private static void InstallClient(){string uri = "http://" + Middleware.GetMainHostName() +":"+ Middleware.SERVER_PORT + "/" + FUNCTION;// e.g.: http://samson.csse.monash.edu.au:1989/DFtry{Instance = (DirectoryFacilitator)Activator.GetObject(typeof (DirectoryFacilitator),uri);Console.WriteLine("DF - Available remotely");}catch(System.Net.WebException e){// Cannot get proxystring msg = "Cannot find Directory Facilitator onmain host: "+ uri + "\\n" + e.Message;throw new Exception(msg);}}/// /// Current process is main host: create DF and make itaccessible remotely./// private static void InstallServer(){Instance = new DirectoryFacilitator();RemotingServices.Marshal(Instance, FUNCTION);Console.WriteLine("DF - Available locally");}MSc EMOOSE Thesis – http://www.emn.fr/EMOOSE 76