WCF心跳判斷服務端及客戶端是否掉線並實現重鏈接

本篇文章將經過一個實例實現對WCF中針對服務端以及客戶端是否掉線進行判斷;若掉線時服務器或客戶端又在線時將實現自動重連;將經過WCF的雙工知識以及相應的心跳包來實現此功能;服務器

首先了解一下本實例的一個分層架構圖;相信瞭解WCF對這個分層法確定都很瞭解;其中Client爲客戶端,Interface爲契約層,Service則是實現契約的服務層;架構

接下來咱們將對各層進行一個簡單的講解;方便你們理解實例的實現方式;tcp

首先咱們瞭解契約層Interface;由於咱們利用WCF中的雙工知識,因此此處咱們定義的兩個接口,其中ICallback爲回調接口;IPushMessage上面定義的回調;咱們發現回調接口上並無定義ServiceContract; 實際上是WCF當一個接口被定義成回調接口時已經默認了;學習

複製代碼
using System.ServiceModel;
namespace Interface
{
    [ServiceContract(SessionMode=SessionMode.Required,CallbackContract=typeof(ICallback))]
    public interface IPushMessage
    {
        [OperationContract(IsOneWay = true)]
        void Login(string UID);

        [OperationContract(IsOneWay = true)]
        void Update(string UID);

        [OperationContract(IsOneWay = true)]
        void Leave(string UID);
    }
}
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複製代碼
using System.ServiceModel;
namespace Interface
{
    public interface ICallback
    {
        [OperationContract(IsOneWay = true)]
        void ShowMessage(string msg);
    }
}
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接着咱們瞭解一下實現契約的服務層Service;此處包括實現接口IPushMessage的服務內容,還定義一個類WcfCleint;在PushMessageServer服務內裏咱們定義的一個靜態成員Dictionary<string,WcfCleint>用於記錄咱們客戶端上下線的操做;定義的一個lockObje用來鎖定每一個操做,在最後咱們還定義的一個定時器用來判斷客戶端用戶是否脫機了;其中方法Update()咱們就實現的雙工中的回調;ui

複製代碼
using System.ServiceModel;
using Interface;
namespace Service
{
    public class PushMessageServer:IPushMessage
    {
        static Dictionary<string, WcfCleint> dit_callback = new Dictionary<string, WcfCleint>();

        private static Object lockObje = new Object();

        public void Login(string UID)
        {
            Console.WriteLine("用戶:" + UID + "上線");
            lock (lockObje)
            {
                dit_callback.Add(UID, new WcfCleint(OperationContext.Current.GetCallbackChannel<ICallback>(), DateTime.Now));
            }
        }

        public void Update(string UID)
        {
            ICallback callback = OperationContext.Current.GetCallbackChannel<ICallback>();
            Console.WriteLine("用戶:" + UID + "心跳更新!");
            lock (lockObje)
            {
                if (dit_callback.ContainsKey(UID))
                {
                    dit_callback.Remove(UID);
                }
                dit_callback.Add(UID, new WcfCleint(OperationContext.Current.GetCallbackChannel<ICallback>(), DateTime.Now));
                callback.ShowMessage(UID);
            }
        }

        public void Leave(string UID)
        {
            Console.WriteLine("用戶:" + UID + "退出!");
            lock (lockObje)
            {
                dit_callback.Remove(UID);
            }
        }

        static System.Timers.Timer timer1;
        public static void StartListenClients()
        {
            timer1 = new System.Timers.Timer();
            timer1.Interval = 500;
            timer1.Elapsed += new System.Timers.ElapsedEventHandler(time_EventArgs);
            timer1.Start();
        }

        static void time_EventArgs(object sender, System.Timers.ElapsedEventArgs e)
        {
            lock (lockObje)
            {
                foreach (string key in new List<string>(dit_callback.Keys))
                {
                    if (dit_callback[key].NowdateTime.AddSeconds(5) < DateTime.Now)
                    {
                        dit_callback.Remove(key);
                        Console.WriteLine("脫機用戶" + key);
                    }
                }
            }
        }
    }
}
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接着咱們簡單看一下WcfCleint的代碼:this

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using Interface;
using System.ServiceModel;
namespace Service
{
    public class WcfCleint
    {
        public DateTime NowdateTime { get; set; }
        public ICallback callbackHandler { get; set; }

        public WcfCleint(ICallback callback, DateTime nowTime)
        {
            this.callbackHandler = callback;
            this.NowdateTime = nowTime;
        }
    }
}
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服務端的配置文件信息,此處咱們採用net.tcp方式:spa

複製代碼
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="exposeExceptionDetail">
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service name="Service.PushMessageServer"
               behaviorConfiguration="exposeExceptionDetail">
        <endpoint address="net.tcp://127.0.0.1:3721/PushMessageServer"
                  binding="netTcpBinding"
                  contract="Interface.IPushMessage"/>
      </service>
    </services>
  </system.serviceModel>
</configuration>
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服務端的運行入口代碼,經過一個線程不斷的運行:線程

複製代碼
using System.Threading;
using System.ServiceModel.Description;
namespace Service
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ServiceHost host = new ServiceHost(typeof(PushMessageServer)))
            {
                host.Open();
                Console.WriteLine("WCF心跳包實現開始監聽");
                PushMessageServer.StartListenClients();
                int i = 0;
                while (true)
                {
                    System.Threading.Thread.Sleep(2000);
                    i++;
                }
                Console.Read();
                host.Abort();
                host.Close();
            }
        }
    }
}
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接着瞭解客戶端層的狀況;首先是一個實現的回調接口的內容類;code

複製代碼
using Interface;
namespace Client
{
    public class CallServer:ICallback
    {
        public void ShowMessage(string msg)
        {
            Console.WriteLine("服務器正在工做中;" + msg);
        }
    }
}
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客戶端的配置信息以下:server

複製代碼
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <client>
      <endpoint name="pushmessageserver"
                address="net.tcp://127.0.0.1:3721/PushMessageServer"
                binding="netTcpBinding"
                contract="Interface.IPushMessage"/>
    </client>
  </system.serviceModel>
</configuration>
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客戶端的運行入口代碼以下,它會判斷服務器是否掉線,若掉線會試着重連:

複製代碼
using System.ServiceModel;
using Interface;
using System.ServiceModel.Channels;
using System.Threading;
namespace Client
{
    class Program
    {
        static void Main(string[] args)
        {
            InstanceContext callback = new InstanceContext(new CallServer());
            using (DuplexChannelFactory<IPushMessage> channelFactory = new DuplexChannelFactory<IPushMessage>(callback, "pushmessageserver"))
            {
                IPushMessage proxy = channelFactory.CreateChannel();
                using (proxy as IDisposable)
                {
                    string UID = "踏浪帥";
                    proxy.Login(UID);

                    while (true)
                    {
                        Thread.Sleep(3000);
                        try
                        {
                            proxy.Update(UID);
                        }
                        catch
                        {
                            try
                            {
                                Console.WriteLine("正在重連");
                                proxy = channelFactory.CreateChannel();
                                proxy.Login(UID);
                            }
                            catch
                            {
                                Console.WriteLine("重連異常");
                            }
                        }
                    }
                }
            }
            Console.Read();
        }
    }
}
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代碼的內容就如上,接着咱們簡單看一下運行的效果:

1:首先運行服務端,讓其處於監聽

2:接着運行客戶端,客戶端會顯示服務器正在工做中以及當前的帳號

3:當客戶端上線後,服務端就發現客戶端用戶,並顯示出來,不停的進行判斷

4:當咱們把服務端停掉之後,此時服務是不工做的,咱們能夠看到客戶端就會不停的嘗試着重連服務端;

5:當咱們從新把服務端打開之後,服務端會自運發現正在運行的客戶端信息;

6:上面咱們從新打開服務端,咱們能夠在客戶端發現它重鏈接服務端成功並顯示以下:

7:接着咱們將把客戶端關閉;咱們會在服務端發現它提示客戶端的用戶脫機了;

8:此時服務端仍是不停的監聽中,咱們再把客戶端打開,服務端將會接着顯示用戶;

 

實例爲本人學習WCF知識所寫,其中可能存在不足或錯誤,歡迎你們指正;如果本文對你有幫助別忘記點右下角幫忙推薦,畢竟有你們的支持纔是咱們寫做的動力;

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