Remoting 笔记.

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wx60f7f54847950 2021-08-02 10:02:55 博主文章分类：C#

从LoveCherry的Blog的Remoting之六说起.

一.这是一个客户端激活模式的例子
[原文]1.服务器端代码:

using System;
using System.Collections;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters;

namespace RemoteServer
{
    class MyServer
    {
        [STAThread]
        static void Main(string[] args)
        {
            RemotingConfiguration.ApplicationName="RemoteObject.MyObject";
            RemotingConfiguration.RegisterActivatedServiceType(typeof(RemoteObject.MyObject));
            BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
            BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
            serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
            IDictionary props = new Hashtable();
            props["port"]=8888;
            TcpChannel channel = new TcpChannel(props,clientProvider,serverProvider);
            ChannelServices.RegisterChannel(channel);
            Console.ReadLine();
        }
    }
}

[原文]2.远程对象:

using System;

namespace RemoteObject
{
    [Serializable]
    public class MyEventArgs:EventArgs
    {
        private int _rate;
        private string _ip;

        public int Rate
        {
            get
            {
                return _rate;
            }
        }

        public string IP
        {
            get
            {
                return _ip;
            }
        }

        public MyEventArgs(int rate,string ip)
        {
            this._rate=rate;
            this._ip=ip;
        }
    }

    public class MyObject:MarshalByRefObject
    {
        public delegate void MyEventHandler(object sender,MyEventArgs e);
        public event MyEventHandler MyEvent;
        public string tmp;

        public int ALongTimeMethod(int a,int b,int time,string ip)
        {
            Console.WriteLine("来自"+ip+"的异步方法开始");
            for(int i=1;i<=10;i++)
            {
                System.Threading.Thread.Sleep(time);
                Console.WriteLine("来自"+ip+"的异步方法完成了"+i*10+"%");
                OnMyEvent(new MyEventArgs(i,ip));
            }
            Console.WriteLine("来自"+ip+"的异步方法结束");
            return a+b;
        }

        protected void OnMyEvent(MyEventArgs e)
        {
            if (MyEvent!=null)
            {
                foreach(Delegate d in MyEvent.GetInvocationList())
                {
                    try
                    {
                        ((MyEventHandler)d)(this,e);
                    }
                    catch
                    {
                        MyEvent-=(MyEventHandler)d;
                    }
                }
            }
        }
    }

    public class EventClass:MarshalByRefObject
    {
        public void MyEvent(object sender,MyEventArgs e)
        {
            if(((MyObject)sender).tmp==e.IP)
                Console.WriteLine("异步方法完成了"+e.Rate*10+"%");
        }
    }
}

[原文]3.客户端代码:

using System;
using System.Net;
using System.Collections;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Runtime.Serialization.Formatters;

class MyClient
{
    private delegate int MyDelegate(int a,int b,int time,string ip);
    private static MyDelegate md;
    static RemoteObject.MyObject app;
    static RemoteObject.EventClass ec;
    static DateTime dt;

    [STAThread]
    static void Main(string[] args)
    {
        dt=DateTime.Now;
        RemotingConfiguration.RegisterActivatedClientType(typeof(RemoteObject.MyObject),"tcp://localhost:8888/RemoteObject.MyObject");
        BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
        BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
        serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
        IDictionary props=new Hashtable();
        props["port"]=0;
        TcpChannel channel = new TcpChannel(props,clientProvider,serverProvider);
        ChannelServices.RegisterChannel(channel);
        app=new RemoteObject.MyObject();
        ec=new RemoteObject.EventClass();
        app.MyEvent+=new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
        md=new MyDelegate(app.ALongTimeMethod);
        AsyncCallback ac=new AsyncCallback(MyClient.CallBack);
        IPHostEntry ipHE=Dns.GetHostByName(Dns.GetHostName());
        Random rnd=new Random(System.Environment.TickCount);
        string ip=ipHE.AddressList[0].ToString()+"("+rnd.Next(100000000).ToString()+")";
        app.tmp=ip;
        IAsyncResult Iar=md.BeginInvoke(1,2,500,ip,ac,null);
        Method();
        Console.WriteLine("用了"+((TimeSpan)(DateTime.Now-dt)).TotalSeconds+"秒");
        ChannelServices.UnregisterChannel(channel);
        Console.ReadLine();
    }

    public static void CallBack(IAsyncResult Iar)
    {
        if(Iar.IsCompleted)
        {
            Console.WriteLine("结果是"+md.EndInvoke(Iar));
            app.MyEvent-=new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
        }
    }

    public static void Method()
    {
        Console.WriteLine("主线程方法开始");
        System.Threading.Thread.Sleep(5000);
        Console.WriteLine("主线程方法结束");
    }
}

以上用了客户端激活模式: 有以下特性:
1、客户端激活的时间是在客户端请求的时候，而服务端激活远程对象的时间是在调用对象方法的时候
2、客户端激活可以调用自定义的构造方法，而不像服务端激活只能使用默认的构造方法
3、客户端激活模式一旦获得客户端的请求，将为每一个客户端都建立一个实例引用.服务器的 SingleCall 模式是每个请求有各自的实例引用, SingleTon 模式每个类只有一个实例引用.
4. 客户端激活是有状态的.服务器的 SingleTon 是有状态的,而 SingleCall 是没有状态的.

客户端激活用法特点如下:

1.服务器端用RemotingConfiguration.ApplicationName="RemoteObject.MyObject";来注册一个服务器Uri.
作用是,注册客户端激活方式中,要用一个服务器的 Uri . 客户端用RemotingConfiguration.RegisterActivatedClientType(typeof(RemoteObject.MyObject),"tcp://localhost:8888/RemoteObject.MyObject");来远程注册对象类型.
2.注册知名类型,以便客户端在创建这些类型的时候,是从服务器端创建.
RemotingConfiguration.RegisterActivatedServiceType(typeof(RemoteObject.MyObject));
客户端有两种方式:一种是先注册再声明: 像这样:
RemotingConfiguration.RegisterActivatedClientType(typeof(RemoteObject.MyObject), "tcp://localhost:8888/RemoteServer");
app = new RemoteObject.MyObject();
还可以:
3.其中远程对象,要继承自 MarshalByRefObject

二.把程序改成服务器端激活的 SingleTon 模式.
[改SingleTon]1.服务器端代码:

        static void Main(string[] args)
        {
            RemotingConfiguration.ApplicationName = "RemoteServer";
            RemotingConfiguration.RegisterWellKnownServiceType(typeof(RemoteObject.MyObject),"MyObject",WellKnownObjectMode.Singleton);
            RemotingConfiguration.RegisterWellKnownServiceType(typeof(RemoteObject.EventClass),"EventClass",WellKnownObjectMode.Singleton);
            RemotingConfiguration.RegisterWellKnownServiceType(typeof(RemoteObject.MyObject.MyEventHandler),"MyEventHandler",WellKnownObjectMode.Singleton);
            BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
            BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
            serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
            IDictionary props = new Hashtable();
            props["port"] = 8888;
            TcpChannel channel = new TcpChannel(props, clientProvider, serverProvider);
            ChannelServices.RegisterChannel(channel);
            Console.ReadLine();
        }

[改SingleTon]2.客户端代码:

   static void Main(string[] args)
    {
        dt = DateTime.Now;
        //RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.MyObject), "tcp://localhost:8888/RemoteServer");
        //RemotingConfiguration.RegisterActivatedClientType(typeof(RemoteObject.C), "tcp://localhost:8888/RemoteServer");
        BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
        BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
        serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
        IDictionary props = new Hashtable();
        props["port"] = 0;
        TcpChannel channel = new TcpChannel(props, clientProvider, serverProvider);
        ChannelServices.RegisterChannel(channel);
        //app = new RemoteObject.MyObject();
        app = (RemoteObject.MyObject)Activator.GetObject(typeof(RemoteObject.MyObject), "tcp://localhost:8888/MyObject");
        ec = (RemoteObject.EventClass)Activator.GetObject(typeof(RemoteObject.EventClass), "tcp://localhost:8888/EventClass");//这里应该直接用 new 方法.否则.会在服务器端输出信息.为了调试说明.

        app.MyEvent += new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
        md = new MyDelegate(app.ALongTimeMethod);
        AsyncCallback ac = new AsyncCallback(MyClient.CallBack);
        IPHostEntry ipHE = Dns.GetHostByName(Dns.GetHostName());
        Random rnd = new Random(System.Environment.TickCount);
        string ip = ipHE.AddressList[0].ToString() + "(" + rnd.Next(100000000).ToString() + ")";
        app.tmp = ip;
        IAsyncResult Iar = md.BeginInvoke(1, 2, 500, ip, ac, null);
        Method();
        Console.WriteLine("用了" + ((TimeSpan)(DateTime.Now - dt)).TotalSeconds + "秒");
        ChannelServices.UnregisterChannel(channel);
        Console.ReadLine();
    }

    public static void CallBack(IAsyncResult Iar)
    {
        if (Iar.IsCompleted)
        {
            Console.WriteLine("结果是" + md.EndInvoke(Iar));
            app.MyEvent -= new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
        }
    }

    public static void Method()
    {
        Console.WriteLine("主线程方法开始");
        System.Threading.Thread.Sleep(5000);
        Console.WriteLine("主线程方法结束");
    }

运行结果,是所有显示内容,都在服务器端显示.其中,客户端的Main函数也可以写成:
[改SingleTon]3.客户端的另一种写法(先用 RegisterWellKnownClientType 注册,再用 new 的方法远程声明.)

    static void Main(string[] args)
    {
        dt = DateTime.Now;
        RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.MyObject), "tcp://localhost:8888/MyObject");
        RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.EventClass), "tcp://localhost:8888/EventClass");//这里不应该在远程注册这个对象,这里只是为了调试说明.
        BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
        BinaryClientFormatterSinkProvider clientProvider = new BinaryClientFormatterSinkProvider();
        serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
        IDictionary props = new Hashtable();
        props["port"] = 0;
        TcpChannel channel = new TcpChannel(props, clientProvider, serverProvider);
        ChannelServices.RegisterChannel(channel);
        app = new RemoteObject.MyObject();
        ec = new RemoteObject.EventClass();
        //app = (RemoteObject.MyObject)Activator.GetObject(typeof(RemoteObject.MyObject), "tcp://localhost:8888/MyObject");
        //ec = (RemoteObject.EventClass)Activator.GetObject(typeof(RemoteObject.EventClass), "tcp://localhost:8888/EventClass");

        app.MyEvent += new RemoteObject.MyObject.MyEventHandler(ec.MyEvent);
        md = new MyDelegate(app.ALongTimeMethod);
        AsyncCallback ac = new AsyncCallback(MyClient.CallBack);
        IPHostEntry ipHE = Dns.GetHostByName(Dns.GetHostName());
        Random rnd = new Random(System.Environment.TickCount);
        string ip = ipHE.AddressList[0].ToString() + "(" + rnd.Next(100000000).ToString() + ")";
        app.tmp = ip;
        IAsyncResult Iar = md.BeginInvoke(1, 2, 500, ip, ac, null);
        Method();
        Console.WriteLine("用了" + ((TimeSpan)(DateTime.Now - dt)).TotalSeconds + "秒");
        ChannelServices.UnregisterChannel(channel);
        Console.ReadLine();
    }

同样,结果都会显示在服务器端.这是因为: RemoteObject.EventClass 在[改SigleTon]中,注册成了服务器端的对象. 所以它就会再服务器端执行.[改SigleTon]2.中的

ec = (RemoteObject.EventClass)Activator.GetObject(typeof(RemoteObject.EventClass), "tcp://localhost:8888/EventClass");//这里应该直接用 new 方法.否则.会在服务器端输出信息.为了调试说明.

改为:

ec = new RemoteObject.EventClass;

即可.
或把 [改SigleTon]3. 中的

RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.EventClass), "tcp://localhost:8888/EventClass");//这里不应该在远程注册这个对象,这里只是为了调试说明.

去掉即可.

但是.如果先后开两个客户端. 会看到. 第一个客户端会显示第二个客户端的内容.结果如下:

主线程方法开始
异步方法完成了10%
异步方法完成了20%
异步方法完成了30%
异步方法完成了40%
异步方法完成了10%
异步方法完成了20%
异步方法完成了30%
异步方法完成了40%
异步方法完成了50%
主线程方法结束
用了5.1273728秒
异步方法完成了60%
结果是3

这充分说明了. SigleTon 在服务器端只有一个实例.是单件模式的. 客户端得到的,是最后一个客户所产生的进度.

二.改为服务器端激活的SigleCall模式.
把 [改SigleTon]1.服务器端代码中的 SingleTon 改为 SigleCall 即可.
运行结果服务器端显示正确. 客户端没有显示进度.
客户端不注册EventClass .客户端也不会显示进度. 在客户端注册 EventClass 如下:

RemotingConfiguration.RegisterWellKnownClientType(typeof(RemoteObject.EventClass), "tcp://localhost:8888/EventClass");

服务器端也不会显示客户端进度.
这足以说明: SigleCall 是没有状态的. 所以,客户端所创建的 RemoteObject.MyObject 是无法传递属性到服务器端的. 也不能绑定委托到客户端上.

原文为了在客户端上分别得到结果,所以用了客户端激活模式.