.NET Remoting Basic(1)-概览

      .net Remoting是一个.net体系下的分布式架构.  以Advantages of .NET Remoting 为范本来学习下.

一.定义公用接口和对象

1.接口

public interface ICustomerManager
 {
     Customer GetCustomer(int id);
 }

2.对象

注意此对象被标记为可序列化

[Serializable]
 public class Customer 
 {
 
     public String FirstName;
     public String LastName;
     public DateTime DateOfBirth;
 
     public Customer() 
     {
         Console.WriteLine("Customer.constructor: Object created");
     }
 
     public int GetAge() 
     {
         Console.WriteLine("Customer.getAge(): Calculating age of {0}, " +
             "born on {1}.", 
             FirstName, 
             DateOfBirth.ToShortDateString());
 
         TimeSpan tmp = DateTime.Today.Subtract(DateOfBirth);
         return tmp.Days / 365; // rough estimation
     }
 }

二.注册服务器端服务

1.定义可跨应用程序域边界的类型

当跨应用程序域边界使用类型时，类型必须是从 MarshalByRefObject 继承的

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;
     }
 }

2.注册服务类型

class ServerStartup
 {
     static void Main(string[] args)
     {
         Console.WriteLine ("ServerStartup.Main(): Server started");
 
         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();
     }
 }

3.客户端调用

static void Main(string[] args)
 {
     HttpChannel channel = new HttpChannel();
     ChannelServices.RegisterChannel(channel);
     
     ICustomerManager mgr = (ICustomerManager) Activator.GetObject(
         typeof(ICustomerManager),
         "http://localhost:1234/CustomerManager.soap");
     Console.WriteLine("Client.Main(): Reference to CustomerManager acquired");
 
     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();
 }