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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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public delegate void DisconnectedHandler(); public event DisconnectedHandler OnDisconnected; void FireDisconnected() { if (OnDisconnected != null) OnDisconnected(); } } Listing 12-8. The VB .NET Implementation of the Connection Class Public Class Connection Private _socket As Socket Public ReadOnly Property Socket() As Socket Get Return _socket End Get End Property Private _hostAddress As String Public Property HostAddress() As String Get Return _hostAddress End Get Set(ByVal Value As String) _hostAddress = Value End Set End Property Public ReadOnly Property Connected() As Boolean Get Return Not Socket Is Nothing End Get End Property Private _lastActivity As DateTime = DateTime.Now Public Property LastActivity() As DateTime Get Return _lastActivity End Get Set(ByVal Value As DateTime) _lastActivity = Value End Set End Property ' theHostAddress can be an IP or a DNS Address Public Sub New(ByVal theHostAddress As String) _hostAddress = theHostAddress End Sub
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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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Private TwentyMinutes As TimeSpan = New TimeSpan(0, 20, 0) Public ReadOnly Property IsIdle() As Boolean Get Return TimeSpan.op_GreaterThan( DateTime.Now.Subtract(LastActivity), TwentyMinutes) End Get End Property Public Sub Connect() If Connected Then Return _socket = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) Dim hostEntry As IPHostEntry = Dns.GetHostByName(HostAddress) Dim endPoint As New IPEndPoint(hostEntry.AddressList(0), 8020) Socket.Connect(EndPoint) FireConnected(Socket) End Sub Public Sub Disconnect() If _socket Is Nothing Then Return _socket.Close() _socket = Nothing FireDisconnected() End Sub Public Event OnConnected(ByVal theSocket As Socket) Sub FireConnected(ByVal theSocket As Socket) RaiseEvent OnConnected(theSocket) End Sub Public Event OnDisconnected() Sub FireDisconnected() RaiseEvent OnDisconnected() End Sub End Class Once you open a connection, the Coordinator sends a request and starts a listener thread that waits for incoming messages from the server. Listing 12-9 and Listing 12-10 show C# and VB .NET implementations of HttpRequest. Listing 12-9. The C# Implementation of the HttpRequest Class public class HttpRequest { Socket socket; public HttpRequest(Socket theSocket) { socket = theSocket; }
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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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public void Post(string theLocalPath, int theSequenceNumber, string theMessage) { IPEndPoint endPoint = socket.RemoteEndPoint as IPEndPoint; string header = string.Format("POST {0} HTTP/1.1\r\n" + "Host: {1}:{2}\r\n" + "Sequence-Number: {3}\r\n" + "Connection: Keep-Alive\r\n" + "Content-Length: {4}\r\n", theLocalPath, endPoint.Address, endPoint.Port, theSequenceNumber, theMessage.Length); string message = string.Format("{0}\r\n{1}", header, theMessage); byte[] bytes = Encoding.UTF8.GetBytes(message); NetworkStream stream = new NetworkStream(socket); stream.Write(bytes, 0, bytes.Length); } } Listing 12-10. The VB .NET Implementation of the HttpRequest Class Public Class HttpRequest Private _socket As Socket Public Sub New(ByVal theSocket As Socket) _socket = theSocket End Sub Public Sub Post(ByVal theLocalPath As String, _ ByVal theSequenceNumber As Integer, _ ByVal theMessage As String) Dim endPoint As IPEndPoint = DirectCast(socket.RemoteEndPoint, IPEndPoint) Dim header As String = String.Format("POST {0} HTTP/1.1" + ControlChars.NewLine + _ "Host: {1}:{2}" + ControlChars.NewLine + _ "Sequence-Number: {3}" + ControlChars.NewLine + _ "Connection: Keep-Alive" + ControlChars.NewLine + _ "Content-Length: {4}" + ControlChars.NewLine, _ theLocalPath, endPoint.Address, _ endPoint.Port, theSequenceNumber, _ theMessage.Length) Dim message As String = String.Format("{0}{1}{2}", header, ControlChars.NewLine, theMessage) Dim bytes As Byte() = Encoding.UTF8.GetBytes(message) Dim stream As New NetworkStream(socket) stream.Write(bytes, 0, bytes.Length) End Sub End Class
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CHAPTER 12 CASE STUDY 2: A PIPELINED HTTP SERVICE
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HttpRequest creates an HTTP message by appending an HTTP header to the request to send. Note the SequenceNumber field in the header. I ll show you how to use this field later, when a response is detected, to match the response with the right request. HttpService uses a listener thread to handle responses. The code is contained in class Receiver, whose C# and VB .NET implementations are shown in Listing 12-11 and Listing 12-12. Listing 12-11. The C# Implementation of the Receiver Class public class Receiver { bool stopRequested; Socket socket; public Receiver(Socket theSocket) { socket = theSocket; } public void Stop() { stopRequested = true; } public void Run() { stopRequested = false; while (!stopRequested) CheckForIncomingTraffic(); } void CheckForIncomingTraffic() { if (socket.Available == 0) FireIdle(); else FireResponse(socket); } public delegate void ResponseHandler(Socket theSocket); public event ResponseHandler OnResponse; void FireResponse(Socket theSocket) { if (OnResponse != null) OnResponse(theSocket); } public delegate void IdleHandler(); public event IdleHandler OnIdle; void FireIdle() { if (OnIdle != null) OnIdle(); } }
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