mcs/class/Mono.Posix/Mono.Remoting.Channels.Unix/UnixClientTransportSink.cs

   1 //
   2 // Mono.Remoting.Channels.Unix.UnixClientTransportSink.cs
   3 //
   4 // Author: Dietmar Maurer (dietmar@ximian.com)
   5 //         Lluis Sanchez Gual (lluis@novell.com)
   6 //
   7 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   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 using System.Runtime.Remoting;
  38
  39 namespace Mono.Remoting.Channels.Unix
  40 {
  41         internal class UnixClientTransportSink : IClientChannelSink
  42         {
  43         string _path;
  44
  45                 public UnixClientTransportSink (string url)
  46                 {
  47                         string objectUri;
  48             _path = UnixChannel.ParseUnixURL (url, out objectUri);
  49                 }
  50
  51                 public IDictionary Properties
  52                 {
  53                         get
  54                         {
  55                                 return null;
  56                         }
  57                 }
  58
  59                 public IClientChannelSink NextChannelSink
  60                 {
  61                         get
  62                         {
  63                                 // we are the last one
  64                                 return null;
  65                         }
  66                 }
  67
  68                 public void AsyncProcessRequest (IClientChannelSinkStack sinkStack, IMessage msg,
  69                         ITransportHeaders headers, Stream requestStream)
  70                 {
  71                         UnixConnection connection = null;
  72                         bool isOneWay = RemotingServices.IsOneWay (((IMethodMessage)msg).MethodBase);
  73
  74                         try
  75                         {
  76                                 if (headers == null) headers = new TransportHeaders();
  77                                 headers ["__RequestUri"] = ((IMethodMessage)msg).Uri;
  78
  79                                 // Sends the stream using a connection from the pool
  80                                 // and creates a WorkItem that will wait for the
  81                                 // response of the server
  82
  83                                 connection = UnixConnectionPool.GetConnection (_path);
  84                                 UnixMessageIO.SendMessageStream (connection.Stream, requestStream, headers, connection.Buffer);
  85                                 connection.Stream.Flush ();
  86
  87                                 if (!isOneWay)
  88                                 {
  89                                         sinkStack.Push (this, connection);
  90                                         ThreadPool.QueueUserWorkItem (new WaitCallback(data => {
  91                                                 try {
  92                                                         ReadAsyncUnixMessage (data);
  93                                                 } catch {}
  94                                                 }), sinkStack);
  95                                 }
  96                                 else
  97                                         connection.Release();
  98                         }
  99                         catch
 100                         {
 101                                 if (connection != null) connection.Release();
 102                                 if (!isOneWay) throw;
 103                         }
 104                 }
 105
 106                 private void ReadAsyncUnixMessage(object data)
 107                 {
 108                         // This method is called by a new thread to asynchronously
 109                         // read the response to a request
 110
 111                         // The stack was provided as state data in QueueUserWorkItem
 112                         IClientChannelSinkStack stack = (IClientChannelSinkStack)data;
 113
 114                         // The first sink in the stack is this sink. Pop it and
 115                         // get the status data, which is the UnixConnection used to send
 116                         // the request
 117                         UnixConnection connection = (UnixConnection)stack.Pop(this);
 118
 119                         try
 120                         {
 121                                 ITransportHeaders responseHeaders;
 122
 123                                 // Read the response, blocking if necessary
 124                                 MessageStatus status = UnixMessageIO.ReceiveMessageStatus (connection.Stream, connection.Buffer);
 125
 126                                 if (status != MessageStatus.MethodMessage)
 127                                         throw new RemotingException ("Unknown response message from server");
 128
 129                                 Stream responseStream = UnixMessageIO.ReceiveMessageStream (connection.Stream, out responseHeaders, connection.Buffer);
 130
 131                                 // Free the connection, so it can be reused
 132                                 connection.Release();
 133                                 connection = null;
 134
 135                                 // Ok, proceed with the other sinks
 136                                 stack.AsyncProcessResponse (responseHeaders, responseStream);
 137                         }
 138                         catch
 139                         {
 140                                 if (connection != null) connection.Release();
 141                                 throw;
 142                         }
 143                 }
 144
 145                 public void AsyncProcessResponse (IClientResponseChannelSinkStack sinkStack,
 146                         object state, ITransportHeaders headers,
 147                         Stream stream)
 148                 {
 149                         // Should never be called
 150                         throw new NotSupportedException();
 151                 }
 152
 153                 public Stream GetRequestStream (IMessage msg, ITransportHeaders headers)
 154                 {
 155                         return null;
 156                 }
 157
 158                 public void ProcessMessage (IMessage msg,
 159                         ITransportHeaders requestHeaders,
 160                         Stream requestStream,
 161                         out ITransportHeaders responseHeaders,
 162                         out Stream responseStream)
 163                 {
 164                         UnixConnection connection = null;
 165                         try
 166                         {
 167                                 if (requestHeaders == null) requestHeaders = new TransportHeaders();
 168                                 requestHeaders ["__RequestUri"] = ((IMethodMessage)msg).Uri;
 169
 170                                 // Sends the message
 171                                 connection = UnixConnectionPool.GetConnection (_path);
 172                                 UnixMessageIO.SendMessageStream (connection.Stream, requestStream, requestHeaders, connection.Buffer);
 173                                 connection.Stream.Flush ();
 174
 175                                 // Reads the response
 176                                 MessageStatus status = UnixMessageIO.ReceiveMessageStatus (connection.Stream, connection.Buffer);
 177
 178                                 if (status != MessageStatus.MethodMessage)
 179                                         throw new RemotingException ("Unknown response message from server");
 180
 181                                 responseStream = UnixMessageIO.ReceiveMessageStream (connection.Stream, out responseHeaders, connection.Buffer);
 182                         }
 183                         finally
 184                         {
 185                                 if (connection != null)
 186                                         connection.Release();
 187                         }
 188                 }
 189
 190         }
 191
 192
 193 }