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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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// get the semaphore for the blocked request thread ThreadSemaphore semaphore = blockedRequests.Get(response.SequenceNumber); if (semaphore == null) throw new Exception("No pending request found for response"); // save the response in the semaphore semaphore.response = response.Body; // unblock the request thread waiting for this response semaphore.Signal(); } private void ConnectHandler(Socket theSocket) { receiver = new Receiver(theSocket); receiver.OnIdle += new HttpService.Receiver.IdleHandler(ReceiverIdle); receiver.OnResponse += new HttpService.Receiver.ResponseHandler(HandleResponse); receiverThread = new Thread(new ThreadStart(receiver.Run)); receiverThread.Name = "Receiver"; receiverThread.IsBackground = true; receiverThread.Start(); } private void DisconnectHandler() { receiver.Stop(); receiverThread.Join(); // wait for thread to stop receiver = null; } void ReceiverIdle() { Thread.Sleep(10); } } Listing 12-6. The VB .NET Implementation of CoordinatorConnection Public Class CoordinatorConnection Private blockedRequests As RequestQueue ' blocked request threads Private receiver As Receiver ' listens for incoming traffic Private connection As Connection ' handles requests and responses Private rxTimeout As TimeSpan ' time to wait for a response Private receiverThread As Thread ' background receiver thread Public ReadOnly Property IsIdle() As Boolean Get Return _connection.IsIdle End Get End Property
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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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Public Sub New(ByVal theHostAddress As String, _rxTimeout = theRxTimeout _blockedRequests = New RequestQueue
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ByVal theRxTimeout As TimeSpan)
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_connection = New Connection(theHostAddress) AddHandler _connection.OnConnected, AddressOf ConnectHandler AddHandler _connection.OnDisconnected, AddressOf DisconnectHandler End Sub ' returns the response Public Function Send(ByVal theLocalPath As String, _ ByVal theSequenceNumber As Integer, _ ByVal theMessage As String) As String Dim semaphore As ThreadSemaphore = Nothing SyncLock (Me) ' we use a lock here, to prevent concurrent requests ' from getting mixed together on their way out _connection.Connect() _connection.LastActivity = DateTime.Now Dim request As New HttpRequest(_connection.Socket) request.Post(theLocalPath, theSequenceNumber, theMessage) semaphore = _blockedRequests.Add(theSequenceNumber, theMessage) End SyncLock ' block until the response arrives, or a timeout occurs If Not semaphore.Wait(_rxTimeout) Then Throw New Exception("No response received") End If ' get the response from the semaphore Dim response As Byte() = semaphore.response _blockedRequests.Remove(theSequenceNumber) Return Encoding.UTF8.GetString(response) End Function Public Sub Disconnect() _connection.Disconnect() End Sub Sub HandleResponse(ByVal theSocket As Socket) ' read the response Dim response As New HttpResponse(theSocket) response.Get() ' get the semaphore for the blocked request thread Dim semaphore As ThreadSemaphore = _blockedRequests.Get(response.SequenceNumber) If semaphore Is Nothing Then Throw New Exception("No pending request found for response") End If ' save the response in the semaphore semaphore.response = response.Body
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' unblock the request thread waiting for this response semaphore.Signal() End Sub Private Sub ConnectHandler(ByVal theSocket As Socket) _receiver = New Receiver(theSocket) AddHandler _receiver.OnIdle, AddressOf ReceiverIdle AddHandler _receiver.OnResponse, AddressOf HandleResponse _receiverThread = New Thread(AddressOf _receiver.Run) _receiverThread.Name = "Receiver" _receiverThread.IsBackground = True _receiverThread.Start() End Sub Private Sub DisconnectHandler() _receiver.Stop() _receiverThread.Join() ' wait for thread to stop _receiver = Nothing End Sub Sub ReceiverIdle() Thread.Sleep(10) End Sub End Class Let s look at the salient Worker objects in the connection Coordinator team, starting with Connection. This class just handles the opening and closing of TCP socket connections. It fires an event when a connection is opened or closed. Listing 12-7 and Listing 12-8 show C# and VB .NET implementations. Listing 12-7. The C# Implementation of the Connection Class public class Connection { Socket socket; public Socket Socket { get {return socket;} } string hostAddress; public string HostAddress { get {return hostAddress;} set {hostAddress = value;} } public bool Connected { get {return socket != null;} }
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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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DateTime lastActivity = DateTime.Now; public DateTime LastActivity { get {return lastActivity;} set {lastActivity = value;} } // theHostAddress can be an IP or a DNS Address public Connection(string theHostAddress) { hostAddress = theHostAddress; } TimeSpan TwentyMinutes = new TimeSpan(0, 20, 0); public bool IsIdle { get {return (DateTime.Now - LastActivity) > TwentyMinutes;} } public void Connect() { if (Connected) return; socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPHostEntry hostEntry = Dns.GetHostByName(hostAddress); IPEndPoint endPoint = new IPEndPoint(hostEntry.AddressList[0], 8020); socket.Connect(endPoint); FireConnected(socket); } public void Disconnect() { if (socket == null) return; socket.Close(); socket = null; FireDisconnected(); } public delegate void ConnectedHandler(Socket theSocket); public event ConnectedHandler OnConnected; void FireConnected(Socket theSocket) { if (OnConnected != null) OnConnected(theSocket); }
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