class/System.Runtime.Remoting/System.Runtime.Remoting.Channels.Tcp/TcpClientTransportSink.cs

   1 //
   2 // System.Runtime.Remoting.Channels.Tcp.TcpClientTransportSink.cs
   3 //
   4 // Author: Dietmar Maurer (dietmar@ximian.com)
   5 //         Lluis Sanchez Gual (lluis@ideary.com)
   6 //
   7 // 2002 (C) Copyright, Ximian, Inc.
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Runtime.Remoting.Channels;
  33 using System.Runtime.Remoting.Messaging;
  34 using System.Collections;
  35 using System.IO;
  36 using System.Threading;
  37
  38 namespace System.Runtime.Remoting.Channels.Tcp
  39 {
  40         internal class TcpClientTransportSink : IClientChannelSink
  41         {
  42                 string _host;
  43                 int _port;
  44
  45                 public TcpClientTransportSink (string url)
  46                 {
  47                         string objectUri;
  48                         string port;
  49
  50                         TcpChannel.ParseTcpURL (url, out _host, out port, out objectUri);
  51
  52                         try {
  53                                 if (port != null)
  54                                         _port = Convert.ToInt32 (port);
  55                                 else
  56                                         _port = 0;
  57                         } catch {
  58                                 _host = null;
  59                                 _port = -1;
  60                         }
  61                 }
  62
  63                 public IDictionary Properties
  64                 {
  65                         get
  66                         {
  67                                 return null;
  68                         }
  69                 }
  70
  71                 public IClientChannelSink NextChannelSink
  72                 {
  73                         get
  74                         {
  75                                 // we are the last one
  76                                 return null;
  77                         }
  78                 }
  79
  80                 public void AsyncProcessRequest (IClientChannelSinkStack sinkStack, IMessage msg,
  81                         ITransportHeaders headers, Stream requestStream)
  82                 {
  83                         TcpConnection connection = null;
  84                         bool isOneWay = RemotingServices.IsOneWay (((IMethodMessage)msg).MethodBase);
  85
  86                         try
  87                         {
  88                                 if (headers == null) headers = new TransportHeaders();
  89                                 headers [CommonTransportKeys.RequestUri] = ((IMethodMessage)msg).Uri;
  90
  91                                 // Sends the stream using a connection from the pool
  92                                 // and creates a WorkItem that will wait for the
  93                                 // response of the server
  94
  95                                 connection = TcpConnectionPool.GetConnection (_host, _port);
  96                                 TcpMessageIO.SendMessageStream (connection.Stream, requestStream, headers, connection.Buffer, isOneWay);
  97                                 connection.Stream.Flush ();
  98
  99                                 if (!isOneWay)
 100                                 {
 101                                         sinkStack.Push (this, connection);
 102                                         ThreadPool.QueueUserWorkItem (new WaitCallback(ReadAsyncTcpMessage), sinkStack);
 103                                 }
 104                                 else
 105                                         connection.Release();
 106                         }
 107                         catch
 108                         {
 109                                 if (connection != null) connection.Release();
 110                                 if (!isOneWay) throw;
 111                         }
 112                 }
 113
 114                 private void ReadAsyncTcpMessage(object data)
 115                 {
 116                         // This method is called by a new thread to asynchronously
 117                         // read the response to a request
 118
 119                         // The stack was provided as state data in QueueUserWorkItem
 120                         IClientChannelSinkStack stack = (IClientChannelSinkStack)data;
 121
 122                         // The first sink in the stack is this sink. Pop it and
 123                         // get the status data, which is the TcpConnection used to send
 124                         // the request
 125                         TcpConnection connection = (TcpConnection)stack.Pop(this);
 126
 127                         try
 128                         {
 129                                 ITransportHeaders responseHeaders;
 130
 131                                 // Read the response, blocking if necessary
 132                                 MessageStatus status = TcpMessageIO.ReceiveMessageStatus (connection.Stream, connection.Buffer);
 133
 134                                 if (status != MessageStatus.MethodMessage)
 135                                         throw new RemotingException ("Unknown response message from server");
 136
 137                                 Stream responseStream = TcpMessageIO.ReceiveMessageStream (connection.Stream, out responseHeaders, connection.Buffer);
 138
 139                                 // Free the connection, so it can be reused
 140                                 connection.Release();
 141                                 connection = null;
 142
 143                                 // Ok, proceed with the other sinks
 144                                 stack.AsyncProcessResponse (responseHeaders, responseStream);
 145                         }
 146                         catch
 147                         {
 148                                 if (connection != null) connection.Release();
 149                                 throw;
 150                         }
 151                 }
 152
 153                 public void AsyncProcessResponse (IClientResponseChannelSinkStack sinkStack,
 154                         object state, ITransportHeaders headers,
 155                         Stream stream)
 156                 {
 157                         // Should never be called
 158                         throw new NotSupportedException();
 159                 }
 160
 161                 public Stream GetRequestStream (IMessage msg, ITransportHeaders headers)
 162                 {
 163                         return null;
 164                 }
 165
 166                 public void ProcessMessage (IMessage msg,
 167                         ITransportHeaders requestHeaders,
 168                         Stream requestStream,
 169                         out ITransportHeaders responseHeaders,
 170                         out Stream responseStream)
 171                 {
 172                         TcpConnection connection = null;
 173                         try
 174                         {
 175                                 if (requestHeaders == null) requestHeaders = new TransportHeaders();
 176                                 requestHeaders [CommonTransportKeys.RequestUri] = ((IMethodMessage)msg).Uri;
 177
 178                                 // Sends the message
 179                                 connection = TcpConnectionPool.GetConnection (_host, _port);
 180                                 TcpMessageIO.SendMessageStream (connection.Stream, requestStream, requestHeaders, connection.Buffer);
 181                                 connection.Stream.Flush ();
 182
 183                                 // Reads the response
 184                                 MessageStatus status = TcpMessageIO.ReceiveMessageStatus (connection.Stream, connection.Buffer);
 185
 186                                 if (status != MessageStatus.MethodMessage)
 187                                         throw new RemotingException ("Unknown response message from server");
 188
 189                                 responseStream = TcpMessageIO.ReceiveMessageStream (connection.Stream, out responseHeaders, connection.Buffer);
 190                         }
 191                         finally
 192                         {
 193                                 if (connection != null)
 194                                         connection.Release();
 195                         }
 196                 }
 197
 198         }
 199
 200
 201 }