2016-06-10 52 views
4

我需要我的WCF服務將事件提交給客戶端。我讀過一個碰巧經過回調通道,我已經實現了它以下列方式: 服務接口:如何在通過ChannelFactory創建的WCF服務上設置回調通道?

public interface IServiceCallback 
{ 
    [OperationContract(IsOneWay = true)] 
    void OnNewAlert(Alert a); 
    [OperationContract(IsOneWay = true)] 
    void OnProductEdited(Product p); 
    [OperationContract(IsOneWay = true)] 
    void OnHighlightChanged(Dictionary<User, List<Product>> highlighted); 
    [OperationContract(IsOneWay = true)] 
    void OnCatalogUpdated(); 


    event EventHandler NewAlert; 
    event EventHandler ProductEdited; 
    event EventHandler HighlightChanged; 
    event EventHandler CatalogUpdated; 
} 
[ServiceContract(CallbackContract = typeof(IServiceCallback))] 
public interface IService : IDisposable 
{ 
    [OperationContract] 
    List<Product> GetProducts(Predicate<Product> match = null, int limit = 0, string username = null); 
    [OperationContract] 
    Product GetProduct(Predicate<Product> match, string username = null); 
    [OperationContract] 
    Product GetRandomProduct(Predicate<Product> match = null, string username = null); 
    [OperationContract] 
    int GetFlagIndex(string flagName); 
    [OperationContract] 
    void SetFlag(string pid, string flagName, bool value); 
    [OperationContract] 
    List<Alert> GetAlerts(string username); 
    [OperationContract] 
    void DismissAlert(Alert alert, String username); 
    [OperationContract] 
    void HighlightProduct(List<string> pids, string user); 
    [OperationContract] 
    void EditProduct(string pid, Dictionary<string, object> fieldValues, string username = null); 
    [OperationContract] 
    void AttachModule(IModule m); 
    [OperationContract] 
    void Ping(); 

    event EventHandler NewAlert; 
    event EventHandler ProductEdited; 
    event EventHandler HighlightChanged; 
    event EventHandler CatalogUpdated; 
} 

服務實現:

namespace Service 
{ 
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)] 
public class ServiceInstance : IService 
{ 
    List<IServiceCallback> callbackChannels = new List<IServiceCallback>(); 
    //other vars 

    public ServiceInstance() 
    { 
      //lots of stuff here 
    } 

    private User SignalUser(string username) 
    { 
     if (username == null) 
      return null; 

     IServiceCallback channel = OperationContext.Current.GetCallbackChannel<IServiceCallback>(); 
     if (!callbackChannels.Contains(channel)) //if CallbackChannels not contain current one. 
     { 
      callbackChannels.Add(channel); 
     } 

     User user = knownUsers.Find(p => p.username == username); 
     if (user == null) 
     { 
      user = new User(); 
      user.username = username; 
      user.highlighColor = Color.FromArgb(r.Next(0, 128), r.Next(0, 128), r.Next(0, 128)); 
      knownUsers.Add(user); 
      foreach (KeyValuePair<Alert, List<User>> kvp in alerts) 
      { 
       kvp.Value.Add(user); 
      } 
     } 
     user.lastOnline = DateTime.Now; 
     if(!onlineUsers.Contains(user)) 
      onlineUsers.Add(user); 

     return user; 
    } 

    //lots of other things here 
} 
} 

上的客戶端回調實現:

class ServiceEventHandler : IServiceCallback 
{ 
    public event EventHandler NewAlert; 
    public event EventHandler ProductEdited; 
    public event EventHandler HighlightChanged; 
    public event EventHandler CatalogUpdated; 

    public void OnCatalogUpdated() 
    { 
     CatalogUpdated?.BeginInvoke(null, null, null, null); 
    } 

    public void OnHighlightChanged(Dictionary<User, List<Product>> highlighted) 
    { 
     HighlightChanged?.BeginInvoke(highlighted, EventArgs.Empty, null, null); 
    } 

    public void OnNewAlert(Alert a) 
    { 
     NewAlert?.BeginInvoke(a, EventArgs.Empty, null, null); 
    } 

    public void OnProductEdited(Product p) 
    { 
     ProductEdited?.BeginInvoke(p, EventArgs.Empty, null, null); 
    } 
} 

但這是我的問題: 在客戶端,我是應該將它傳遞給這樣的服務:根據這個StackOverflow的答案

EventHandler eventHandler = new EventHandler(); 
MyServiceClient client = new MyServiceClient(new InstanceContext(eventHandler)); 

https://stackoverflow.com/a/1143777/2018696

但我不連接到我的服務就是這樣,因爲我的客戶不知道的實施的服務,它只知道兩個接口! 所以我連這樣的:

public static IService GetService(string serviceAddress) 
    { 
     Uri service_uri = new Uri(serviceAddress); 
     var endpoint = new EndpointAddress(service_uri, new[] { AddressHeader.CreateAddressHeader(settings["username"], "", "") }); 
     IService service = ChannelFactory<IService>.CreateChannel(new BasicHttpBinding(), endpoint); 
     return service; 
    } 

那麼,如何讓回調的工作?

UPDATE:

好,從而提出一個意見,我更換的ChannelFactory與DuplexChannelFactory和basicHttpBinding的與WsDualHTTPBinding,我沒有得到來自服務器的響應。如果我抓取回調處理程序,我會得到BasicHTTPBinding的響應。所以基本上:

[ServiceContract] 
BasicHttpBinding(); 
ChannelFactory<IService>.CreateChannel(binding, endpoint); 

^這個作品

[ServiceContract(CallbackContract = typeof(IServiceCallback))] 
WSDualHttpBinding(WSDualHttpSecurityMode.None); 
DuplexChannelFactory<IService>.CreateChannel(new InstanceContext(handler), binding, endpoint); 

^這個沒有。

它適用於localhost,但不適用於LAN或Internet。防火牆在服務器和客戶端都處於關閉狀態。當我嘗試聯繫服務器時,我收到了60秒的超時時間。

+3

請查看[DuplexChannelFactory類](https://msdn.microsoft.com/en-us/library/ms576164(v = vs.110).aspx),它應該指向您繼續的方向。 – carlosfigueira

+0

@carlosfigueira謝謝,我做了一些修改,但是現在我沒有得到服務的迴應,請在操作中查看「更新」。謝謝! – Daniel

回答

0

我發現我的連接問題是由於在客戶端的路徑上沒有設置端口轉發。由於我無法確保正確的端口訪問客戶端,我已恢復爲非回調模式,並將使用來自客戶端的常規請求來接收來自服務的累積事件數據。可能效率不高,但似乎迄今爲止工作的一種萬無一失的方法。謝謝大家的關注。

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