WCF实现消息推送（单向操作/观察者模式）

1.协议

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ServiceModel;namespace WCFHub.IService{    [ServiceContract(CallbackContract=typeof(IEventCallback))]    public interface IEventService    {        [OperationContract(IsOneWay = true)]        void Subscribe(SubscribeArg a);        [OperationContract(IsOneWay = true)]        void Unsubscribe(ArgumentBase<String> a);        [OperationContract]        DateTime Ping();    }    public interface IEventCallback    {         [OperationContract(IsOneWay = true)]        void OnMessageReceived(ArgumentBase<String> a);    }}

 

2.实现

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Collections.Concurrent;using System.ServiceModel;using System.ServiceModel.Channels;namespace WCFHub.IService{    public class EventServiceImpl:IEventService    {        public static readonly ConcurrentDictionary<String, SubscribeContext> _Subscribers = new ConcurrentDictionary<String, SubscribeContext>();        public string ClientIpAndPort()        {            OperationContext context = OperationContext.Current;            MessageProperties properties = context.IncomingMessageProperties;            RemoteEndpointMessageProperty endpoint = properties[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;            return endpoint.Address + ":" + endpoint.Port.ToString();        }        public void Subscribe(SubscribeArg a)        {            Console.WriteLine(ClientIpAndPort());           var callback  = OperationContext.Current.GetCallbackChannel<IEventCallback>();            a.Username=a.Username.ToLower();           _Subscribers[a.Username]=new SubscribeContext(){Arg=a,Callback=callback};           #region 事件处理           ICommunicationObject obj = (ICommunicationObject)callback;           obj.Closed += (s,e) =>           {                              Console.WriteLine("Closed");           };           obj.Faulted += (s, e) => {               Console.WriteLine("Faulted");           };           obj.Closing += (s,e) =>            {               Console.WriteLine("Closeing" + OperationContext.Current);               var callback2=(IEventCallback)s;               _Subscribers.ToList().ForEach(ent => {                   if (ent.Value.Callback == callback2)                   {                       RemoveSubscriber(ent.Value.Arg.Username);                   }               });           };           #endregion        }        public void Unsubscribe(ArgumentBase<string> a)        {            RemoveSubscriber(a.Model);           }        private static void RemoveSubscriber(string username)        {            username = username.ToLower();            if (_Subscribers.ContainsKey(username))            {                SubscribeContext outObj = null;                _Subscribers.TryRemove(username, out outObj);            }        }        public static void PostData(ArgumentBase<string> a)        {            Console.WriteLine("收到待发消息:" + a.Model);            _Subscribers.ToList().ForEach(subscriber =>            {                ICommunicationObject callback = (ICommunicationObject)subscriber.Value.Callback;                if (((ICommunicationObject)callback).State == CommunicationState.Opened)                {                    try                    {                        //此处需要加上权限判断、订阅判断等                       subscriber.Value.Callback.OnMessageReceived(a);                    }                    catch (Exception ex)                    {                        RemoveSubscriber(subscriber.Value.Arg.Username);                        Console.WriteLine("PostData:" + ex.Message);                    }                }                else                {                    RemoveSubscriber(subscriber.Value.Arg.Username);                    Console.WriteLine("PostData,用户链接已经关闭");                }                                                });        }        #region IEventService 成员        public DateTime Ping()        {            Console.WriteLine("Ping:" + ClientIpAndPort() +"," +DateTime.Now);            return DateTime.Now;        }        #endregion    }    public class SubscribeContext    {        public SubscribeArg Arg { get; set; }        public IEventCallback Callback { get; set; }    }}

 

3.实体类

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace WCFHub.IService{    [Serializable]    public class ArgumentBase<T>    {        private int code;        private string msg;        private T model;        public int Code        {            get { return code; }            set { code = value; }        }        public string Msg        {            get { return msg; }            set { msg = value; }        }        public T Model        {            get { return model; }            set { model = value; }        }    }    public class SubscribeArg : ArgumentBase<int>    {        public String Username { get; set; }        public List<int> Alarms { get; set; }        public SubscribeArg()        {            Alarms = new List<int>();        }    }}

 

4.服务托管

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.ServiceModel;using WCFHub.IService;namespace WCFHub.Win{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private ServiceHost _Host = new ServiceHost(typeof(EventServiceImpl));        private void Form1_Load(object sender, EventArgs e)        {            _Host.AddServiceEndpoint(typeof(IEventService), new NetTcpBinding(SecurityMode.None),                                     "net.tcp://192.168.30.30:9999/EventService"                                      );            _Host.Open();            Console.WriteLine("服务开启...");        }        protected override void OnClosed(EventArgs e)        {            _Host.Close();            base.OnClosed(e);            Console.WriteLine("服务关闭!");        }        private void button1_Click(object sender, EventArgs e)        {            var data = new ArgumentBase<string>() { Model = textBox1.Text + "," + DateTime.Now.ToString() };            EventServiceImpl.PostData(data);        }    }}

 

5.客户端

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using WCFHub.IService;using System.ServiceModel;using System.Threading;namespace WCFHub.WinClient{    #region MessageReceive    public delegate void MessageReceivedHandle(ArgumentBase<string> a);    public class NotifyManager : IEventCallback    {        public event MessageReceivedHandle MessageReceived;        public static int C_MaxErrCount = 5;        public static int C_HeartbeatInterval = 1000 * 10;//10秒一次心跳检测        IEventService _Proxy = null;        private int ErrCounter = 0;        public bool Enabled { get; set; }        public NotifyManager()        {            Enabled = false;        }        private void Close()        {            if (_Proxy != null)            {                try                {                    var comObj = _Proxy as ICommunicationObject;                    comObj.Abort();                }                catch { }            }        }        public void Start()        {            Enabled = true;            StartInternal();            #region 心跳检测            var timer = new System.Timers.Timer();            timer.Enabled = false;            timer.Interval = C_HeartbeatInterval;            timer.Elapsed += (s, ie) =>            {                try                {                    WriteLine("心跳检测...");                    timer.Enabled = false;                    _Proxy.Ping();                    ErrCounter = 0;                }                catch (Exception ex)                {                    WriteLine(ex.Message);                    ErrCounter++;                    if (ErrCounter >= C_MaxErrCount)                    {                        Close();                        StartInternal();                    }                }                finally                {                    timer.Enabled = true;                }            };            timer.Start();            #endregion        }        private void StartInternal()        {            if (!Enabled) return;            lock (this)            {                try                {                    #region                    ErrCounter = 0;                    _Proxy = WCFHelper.Factory.CreateChannel(new InstanceContext(this));                    var comObj = _Proxy as ICommunicationObject;                    comObj.Faulted += (s, ie) =>                    {                        WriteLine("Faulted");                    };                    comObj.Closed += (s, ie) =>                    {                        WriteLine("Closed!");                    };                    comObj.Closing += (s, ie) =>                    {                        WriteLine("Closing!");                    };                    WriteLine("加载并配置完成!");                    _Proxy.Subscribe(new SubscribeArg() { Username = Guid.NewGuid().ToString("N") });                    WriteLine("注册成功!");                    #endregion                }                catch (Exception ex)                {                    WriteLine(ex.Message);                }            }        }        public void Stop()        {            Enabled = false;            Close();        }        public void WriteLine(string msg)        {            Console.WriteLine(msg + "," + DateTime.Now);        }        #region IEventCallback 成员        public void OnMessageReceived(ArgumentBase<string> a)        {            if (MessageReceived != null)            {                MessageReceived(a);            }        }        #endregion    }    #endregion    public partial class Form1 : Form    {        private SynchronizationContext SyncContext = null;        public Form1()        {            InitializeComponent();            SyncContext = SynchronizationContext.Current;        }        NotifyManager _NotifyManager = null;        private void Form1_Load(object sender, EventArgs e)        {            _NotifyManager = new NotifyManager();            _NotifyManager.MessageReceived += OnMessageReceived;            _NotifyManager.Start();        }        protected override void OnClosed(EventArgs e)        {            if (_NotifyManager != null)            {                _NotifyManager.MessageReceived -= this.OnMessageReceived;                _NotifyManager.Stop();            }            base.OnClosed(e);        }        public void OnMessageReceived(ArgumentBase<string> a)        {            Console.WriteLine("收到消息:" + a.Model +",InvokeRequired:" + this.InvokeRequired);            if (this.InvokeRequired)            {                SyncContext.Post((d) =>                {                    textBox1.Text += a.Model + Environment.NewLine;                }, null);            }            else            {                textBox1.Text += a.Model + Environment.NewLine;            }        }        private void button1_Click(object sender, EventArgs e)        {            if (_NotifyManager != null)            {                Console.WriteLine((_NotifyManager as ICommunicationObject).State);            }        }    }    public class WCFHelper    {        private static DuplexChannelFactory<IEventService> _channelFac;        public static DuplexChannelFactory<IEventService> Factory        {            get            {                if (_channelFac == null)                {                    _channelFac =                        new DuplexChannelFactory<IEventService>(typeof(NotifyManager), new NetTcpBinding(SecurityMode.None),                        EndpointStr);                }                return _channelFac;            }        }        private static string EndpointStr        {            get            {                return "net.tcp://192.168.30.30:9999/EventService";            }        }    }}

转自 http://www.cnblogs.com/wdfrog/p/3924718.html