beagled/WebServices/WebServer/LingeringNetworkStream.cs

   1 //
   2 // Mono.ASPNET.ApplicationServer
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) Copyright 2004 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System;
  30 using System.Net.Sockets;
  31
  32 namespace Mono.ASPNET
  33 {
  34         public class LingeringNetworkStream : NetworkStream
  35         {
  36                 const int useconds_to_linger = 2000000;
  37                 const int max_useconds_to_linger = 30000000;
  38                 bool enableLingering = true;
  39                 // We dont actually use the data from this buffer. So we cache it...
  40                 static byte [] buffer;
  41
  42                 public LingeringNetworkStream (Socket sock, bool owns) : base (sock, owns)
  43                 {
  44                 }
  45
  46                 public bool EnableLingering
  47                 {
  48                         get { return enableLingering; }
  49                         set { enableLingering = value; }
  50                 }
  51
  52                 void LingeringClose ()
  53                 {
  54                         int waited = 0;
  55
  56                         if (!Connected)
  57                                 return;
  58
  59                         Socket.Shutdown (SocketShutdown.Send);
  60                         while (waited < max_useconds_to_linger) {
  61                                 int nread = 0;
  62                                 try {
  63                                         if (!Socket.Poll (useconds_to_linger, SelectMode.SelectRead))
  64                                                 break;
  65
  66                                         if (buffer == null)
  67                                                 buffer = new byte [512];
  68
  69                                         nread = Socket.Receive (buffer, 0, buffer.Length, 0);
  70                                 } catch { }
  71
  72                                 if (nread == 0)
  73                                         break;
  74
  75                                 waited += useconds_to_linger;
  76                         }
  77                 }
  78
  79                 public override void Close ()
  80                 {
  81                         if (enableLingering) {
  82                                 try {
  83                                         LingeringClose ();
  84                                 } finally {
  85                                         base.Close ();
  86                                 }
  87                         }
  88                         else
  89                                 base.Close ();
  90                 }
  91
  92                 public bool Connected {
  93                         get { return Socket.Connected; }
  94                 }
  95         }
  96 }