mcs/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                 string _url;
  44                 int _port;
  45
  46                 public TcpClientTransportSink (string url)
  47                 {
  48                         string objectUri;
  49                         _host = TcpChannel.ParseTcpURL (url, out objectUri, out _port);
  50                         _url = url;
  51                 }
  52
  53                 public IDictionary Properties
  54                 {
  55                         get
  56                         {
  57                                 return null;
  58                         }
  59                 }
  60
  61                 public IClientChannelSink NextChannelSink
  62                 {
  63                         get
  64                         {
  65                                 // we are the last one
  66                                 return null;
  67                         }
  68                 }
  69
  70                 public void AsyncProcessRequest (IClientChannelSinkStack sinkStack, IMessage msg,
  71                         ITransportHeaders headers, Stream requestStream)
  72                 {
  73                         TcpConnection connection = null;
  74                         bool isOneWay = RemotingServices.IsOneWay (((IMethodMessage)msg).MethodBase);
  75
  76                         try
  77                         {
  78                                 if (headers == null) headers = new TransportHeaders();
  79                                 headers [CommonTransportKeys.RequestUri] = ((IMethodMessage)msg).Uri;
  80
  81                                 // Sends the stream using a connection from the pool
  82                                 // and creates a WorkItem that will wait for the
  83                                 // response of the server
  84
  85                                 connection = TcpConnectionPool.GetConnection (_host, _port);
  86                                 TcpMessageIO.SendMessageStream (connection.Stream, requestStream, headers, connection.Buffer);
  87
  88                                 if (!isOneWay)
  89                                 {
  90                                         sinkStack.Push (this, connection);
  91                                         ThreadPool.QueueUserWorkItem (new WaitCallback(ReadAsyncTcpMessage), sinkStack);
  92                                 }
  93                                 else
  94                                         connection.Release();
  95                         }
  96                         catch
  97                         {
  98                                 if (connection != null) connection.Release();
  99                                 if (!isOneWay) throw;
 100                         }
 101                 }
 102
 103                 private void ReadAsyncTcpMessage(object data)
 104                 {
 105                         // This method is called by a new thread to asynchronously
 106                         // read the response to a request
 107
 108                         // The stack was provided as state data in QueueUserWorkItem
 109                         IClientChannelSinkStack stack = (IClientChannelSinkStack)data;
 110
 111                         // The first sink in the stack is this sink. Pop it and
 112                         // get the status data, which is the TcpConnection used to send
 113                         // the request
 114                         TcpConnection connection = (TcpConnection)stack.Pop(this);
 115
 116                         try
 117                         {
 118                                 ITransportHeaders responseHeaders;
 119
 120                                 // Read the response, blocking if necessary
 121                                 MessageStatus status = TcpMessageIO.ReceiveMessageStatus (connection.Stream);
 122
 123                                 if (status != MessageStatus.MethodMessage)
 124                                         throw new RemotingException ("Unknown response message from server");
 125
 126                                 Stream responseStream = TcpMessageIO.ReceiveMessageStream (connection.Stream, out responseHeaders, connection.Buffer);
 127
 128                                 // Free the connection, so it can be reused
 129                                 connection.Release();
 130                                 connection = null;
 131
 132                                 // Ok, proceed with the other sinks
 133                                 stack.AsyncProcessResponse (responseHeaders, responseStream);
 134                         }
 135                         catch
 136                         {
 137                                 if (connection != null) connection.Release();
 138                                 throw;
 139                         }
 140                 }
 141
 142                 public void AsyncProcessResponse (IClientResponseChannelSinkStack sinkStack,
 143                         object state, ITransportHeaders headers,
 144                         Stream stream)
 145                 {
 146                         // Should never be called
 147                         throw new NotSupportedException();
 148                 }
 149
 150                 public Stream GetRequestStream (IMessage msg, ITransportHeaders headers)
 151                 {
 152                         return null;
 153                 }
 154
 155                 public void ProcessMessage (IMessage msg,
 156                         ITransportHeaders requestHeaders,
 157                         Stream requestStream,
 158                         out ITransportHeaders responseHeaders,
 159                         out Stream responseStream)
 160                 {
 161                         TcpConnection connection = null;
 162                         try
 163                         {
 164                                 if (requestHeaders == null) requestHeaders = new TransportHeaders();
 165                                 requestHeaders [CommonTransportKeys.RequestUri] = ((IMethodMessage)msg).Uri;
 166
 167                                 // Sends the message
 168                                 connection = TcpConnectionPool.GetConnection (_host, _port);
 169                                 TcpMessageIO.SendMessageStream (connection.Stream, requestStream, requestHeaders, connection.Buffer);
 170
 171                                 // Reads the response
 172                                 MessageStatus status = TcpMessageIO.ReceiveMessageStatus (connection.Stream);
 173
 174                                 if (status != MessageStatus.MethodMessage)
 175                                         throw new RemotingException ("Unknown response message from server");
 176
 177                                 responseStream = TcpMessageIO.ReceiveMessageStream (connection.Stream, out responseHeaders, connection.Buffer);
 178                         }
 179                         finally
 180                         {
 181                                 if (connection != null)
 182                                         connection.Release();
 183                         }
 184                 }
 185
 186         }
 187
 188
 189 }