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使用 VB.NET 2010 - 我对此有点陌生,正在尝试构建负载测试器。这是我到目前为止所拥有的(它正在工作,但不是异步发布。我正在遍历我在数组中的帖子(500 左右)。这是从服务器异步返回信息。我如何设置它在循环时同步推送 2 个或更多文件?
Imports System.Data
Imports System.IO
Imports System.Net
Imports System.Text
Imports System.Threading
Public Class Form1
Private Sub btnStart_Click(sender As System.Object, e As System.EventArgs) Handles btnStart.Click
lblError.Text = ""
lblStatusMsg.Text = "Send Status..."
lblConnectionStatus.Text = "Connection Status..."
getData("test_post_data_1000.csv")
End Sub
Private strQuery As New StringBuilder
Private path As String
Private myPosts(999) As String ' an array of the parsed csv which is ready to be posted
Private csvDS As New DataSet
Private loopCount As Integer ' keeps track of the number of csv rows parsed
Private connectionLimit As String
Private currentConnections As String
Private postsSent As Integer ' keeps track of the number of posts sent in the loop
Public Sub SendAsynchRequest()
Dim request As HttpWebRequest
Dim thePost As String
Dim hashcode As Integer = 0
Try
Dim myURI As New Uri("http://myImportSite.aspx")
' For x = 0 To myPosts.Length - 1
For x = 0 To 9
' Create the request
request = CType(WebRequest.Create(myURI), HttpWebRequest)
request.Method = "POST"
request.ContentType = "application/x-www-form-urlencoded"
Dim currentServicePoint As ServicePoint = request.ServicePoint
' Display new service point properties.
Dim currentHashCode As Integer = currentServicePoint.GetHashCode()
lblConnectionStatus.Text = "New service point hashcode: " + currentHashCode.ToString() & vbCr
lblConnectionStatus.Text = lblConnectionStatus.Text & "New service point max idle time: " + currentServicePoint.MaxIdleTime.ToString() & vbCr
' Check that a new ServicePoint instance has been created.
If hashcode = currentHashCode Then
lblConnectionStatus.Text = lblConnectionStatus.Text & "Service point reused. Count = " & request.ServicePoint.CurrentConnections
Else
lblConnectionStatus.Text = lblConnectionStatus.Text & "Service Point - Current Connections = " & request.ServicePoint.CurrentConnections
End If
Me.Refresh()
request.ServicePoint.ConnectionLimit = 10 ' default is 2 and will only allow 2 posts
request.ServicePoint.MaxIdleTime = 2000 'sets the maximum idle time to 2 seconds
thePost = myPosts(x)
' Convert the string into a byte array
Dim bytes As Byte()
bytes = System.Text.Encoding.UTF8.GetBytes(thePost)
' Assign the content length
request.ContentLength = bytes.Length ' byle length should be about 378 for first record
' Write the postData bytes to request stream
request.GetRequestStream.Write(bytes, 0, bytes.Length)
postsSent = x + 1
Dim result As IAsyncResult
Dim state As WebRequestState
Dim timeout As Integer
' Create the state object used to access the web request
state = New WebRequestState(request)
' Begin the async request
connectionLimit = request.ServicePoint.ConnectionLimit
currentConnections = request.ServicePoint.CurrentConnections
result = request.BeginGetResponse(New AsyncCallback(AddressOf RequestComplete), state)
' Set timeout at 30 seconds
timeout = 1000 * 60
' Register a timeout for the async request
ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, New WaitOrTimerCallback(AddressOf TimeoutCallback), state, timeout, True)
Next
Catch e As Exception
lblError.Text = "Source : " + e.Source & vbCr & _
"Message : " + e.Message
Finally
'If Not (request Is Nothing) Then
' request.close()
'End If
End Try
End Sub
' Method called when a request times out
Private Sub TimeoutCallback(ByVal state As Object, ByVal timeOut As Boolean)
If (timeOut) Then
lblError.Text = "Your request timed out!"
' Abort the request
CType(state, WebRequestState).Request.Abort()
End If
End Sub
' Method called when the request completes
Private Sub RequestComplete(ByVal result As IAsyncResult)
' Get the request
Dim request As WebRequest
request = DirectCast(result.AsyncState, WebRequestState).Request
lblStatusMsg.Text = "Your request is processing..." & vbCr & "Looping through .CSV = " & loopCount & vbCr & vbCr & "Connection Limit = " & connectionLimit & _
vbCr & vbCr & "Posts sent = " & postsSent & vbCr & "Current Connections = " & currentConnections
If postsSent = 39 Then
btnStart.Text = "DONE!"
btnStart.BackColor = Color.Fuchsia
End If
Me.Refresh()
Me.Focus()
End Sub
' Stores web request for access during async processing
Private Class WebRequestState
' Holds the request object
Public Request As WebRequest
Public Sub New(ByVal newRequest As WebRequest)
Request = newRequest
End Sub
End Class
End Class
最佳答案
线程池或一般的线程是您所需要的。
ThreadPool 方式对后台工作任务进行排队的示例。
Public Sub Queue1000WorkTasks()
Threading.ThreadPool.SetMaxThreads(1000, 1000)
For iQ As Integer = 1 To 1000
Threading.ThreadPool.QueueUserWorkItem(New Threading.WaitCallback(AddressOf DoWork_Async), Nothing)
Next
End Sub
Public Sub DoWork_Async(notUsed As Object)
'process something here...
End Sub
与普通线程相同...
Public Sub Queue1000WorkTasks()
For iQ As Integer = 1 To 1000
Dim th As New Threading.Thread(AddressOf DoWork_Async, Nothing)
th.Start()
Next
End Sub
Public Sub DoWork_Async(notUsed As Object)
'process something here...
End Sub
以前从未像这样同时排队 1000 个项目,所以不知道您可以从系统中得到什么。可能先尝试较小的数字。
关于vb.net - vb 2010 - 我需要异步发布 1000 个 http 帖子。,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13606974/
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