我们已在其中一个项目中创建了服务参考。
现在我们在应用程序启动时创建一个这样的实例。
此外,在应用统计信息中,我们为Service.Method1Completed
添加了一个事件处理程序,Service.Method2Completed
等。
然后,在特定事件中,我们会调用Service.Method1Async
,Service.Method2Async
等。请注意,这些调用是由不同的线程发出的。
但是在某些计算机上,事件处理程序永远不会被触发,因此我们开始检查FirstChanceExceptions
,因为当发生这种情况时会发生以下FirstChanceExceptions
。
System.Net.Sockets.SocketException提供了无效的参数 vid System.Net.Sockets.Socket.SetSocketOption(SocketOptionLevel optionLevel,SocketOptionName optionName,Int32 optionValue,Boolean 无声)
System.ObjectDisposedException无法访问已处置的对象。 对象名:System.Net.Sockets.NetworkStream。 VID System.Net.Sockets.NetworkStream.UnsafeBeginWrite(Byte [] buffer,Int32 offset,Int32 size,AsyncCallback回调,对象状态)
System.Net.WebException请求已取消 vid System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
这是否是使用服务参考的无效方式?
如果它是如何使用异步方法与事件同步我的调用(注意我在.net 4.0和VS 2010上,所以await
不在图片中。)。
ServerCode:
<ServiceContract()>
Public Interface IService1
<OperationContract()>
Function GetData(ByVal value As Integer) As String
End Interface
<ServiceBehavior(ConcurrencyMode:=ConcurrencyMode.Multiple, InstanceContextMode:=InstanceContextMode.Single, UseSynchronizationContext:=False)>
Public Class Service1
Implements IService1
Public Sub New()
End Sub
Public Function GetData(ByVal value As Integer) As String Implements IService1.GetData
Return String.Format("You entered: {0}", value)
End Function
End Class
服务器配置:
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior>
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
<serviceThrottling maxConcurrentCalls="1000" maxConcurrentSessions="1000" maxConcurrentInstances="1000" />
</behavior>
</serviceBehaviors>
</behaviors>
<bindings>
<customBinding>
<binding>
<binaryMessageEncoding>
<readerQuotas maxArrayLength="5242880" />
</binaryMessageEncoding>
<httpTransport maxBufferPoolSize="52428800" maxReceivedMessageSize="5242880" maxBufferSize="5242880" authenticationScheme="Anonymous" />
</binding>
</customBinding>
</bindings>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
</system.serviceModel>
客户代码:
Imports System.Threading
Imports System.IO
Module Module1
Dim errorQueue As New System.Collections.Concurrent.ConcurrentBag(Of String)
Dim count As Integer
Sub Main()
AddHandler AppDomain.CurrentDomain.UnhandledException, AddressOf CurrentDomain_UnhandledException
AddHandler AppDomain.CurrentDomain.FirstChanceException, AddressOf AppDomain_FirstChanceException
MultipleClientInstances()
Console.WriteLine("Calls are in progress, press any key when they are done!")
Console.ReadKey()
Thread.MemoryBarrier()
errorQueue.Add("Number of requests remaining " + count.ToString())
Dim line As String = ""
Using writer As New StreamWriter("output.log")
While (errorQueue.TryTake(line))
writer.WriteLine(line)
End While
End Using
End Sub
Private Function GetClient() As ServiceReference1.Service1Client
Dim client As New ServiceReference1.Service1Client()
AddHandler client.GetDataCompleted, AddressOf client_GetDataCompleted
client.Open()
Return client
End Function
Private Sub MultipleClientInstances()
Console.WriteLine("Making calls!")
For i As Integer = 0 To 10
Dim t As New Thread(AddressOf MakeCallsWithNewClients)
t.Start()
Next
End Sub
Private Sub MakeCallsWithNewClients()
For i As Integer = 0 To 400
Interlocked.Increment(count)
Dim client As ServiceReference1.Service1Client = GetClient()
client.GetDataAsync(i, True)
While (Thread.VolatileRead(count) > 20)
Thread.Sleep(5)
End While
Next
End Sub
Private Sub client_GetDataCompleted(sender As Object, e As ServiceReference1.GetDataCompletedEventArgs)
Dim value As Integer = Interlocked.Decrement(count)
Console.WriteLine(value)
Dim client As ServiceReference1.Service1Client = CType(sender, ServiceReference1.Service1Client)
RemoveHandler client.GetDataCompleted, AddressOf client_GetDataCompleted
client.Close()
End Sub
Private Sub CurrentDomain_UnhandledException(ByVal sender As Object, ByVal e As UnhandledExceptionEventArgs)
If (e.ExceptionObject IsNot Nothing AndAlso e.ExceptionObject.GetType().IsSubclassOf(GetType(Exception))) Then
If (e.IsTerminating) Then
Console.WriteLine("Fatal exception occurred termination application, " + CType(e.ExceptionObject, Exception).ToString())
Else
Console.WriteLine("Unhandled exception occurred, " + CType(e.ExceptionObject, Exception).ToString())
End If
Else
If (e.IsTerminating) Then
Console.WriteLine("Fatal exception occurred termination application, " & e.ExceptionObject.ToString())
Else
Console.WriteLine("Unhandled exception occurred, " & e.ExceptionObject.ToString())
End If
End If
errorQueue.Add("UnhandledException: " + e.ExceptionObject.ToString())
End Sub
Private Sub AppDomain_FirstChanceException(ByVal sender As Object, ByVal e As Runtime.ExceptionServices.FirstChanceExceptionEventArgs)
Console.WriteLine("FirstChanceException: " + e.Exception.ToString())
errorQueue.Add("FirstChanceException: " + e.Exception.ToString())
End Sub
End Module
答案 0 :(得分:2)
它们不是线程安全的(例如ClientBase
不是)。但它们创造和销毁的成本很低。每个线程创建一个,甚至每个调用一个。无需同步。
答案 1 :(得分:1)
ClientBase可能不是线程安全的*所以派生代理也不是这样,所以你不能这样使用它们。
您可以创建一个线程安全的基类并自定义生成代理类。
state
参数可用于将响应与传出请求进行匹配。您将在回调事件中的IAsyncResult.AsyncState中找到它。
有一点需要担心的是,当通过同一个频道发送多个请求时,由于某些原因,频道出现故障。
*也要看看这个问题:Is WCF ClientBase thread safe?