class/corlib/System.Runtime.Remoting.Channels/CrossAppDomainChannel.cs

   1 //
   2 // System.Runtime.Remoting.Channels.CrossAppDomainChannel.cs
   3 //
   4 // Author: Patrik Torstensson (totte_mono@yahoo.com)
   5 //         Lluis Sanchez Gual (lluis@ximian.com)
   6 //
   7 // 2003 (C) Copyright, Ximian, Inc.
   8 //
   9
  10 //
  11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Collections;
  34 using System.IO;
  35 using System.Threading;
  36 using System.Runtime.Remoting;
  37 using System.Runtime.Remoting.Messaging;
  38 using System.Runtime.Remoting.Channels;
  39 using System.Runtime.Remoting.Contexts;
  40 using System.Runtime.Serialization;
  41 using System.Runtime.Serialization.Formatters.Binary;
  42 using System.Reflection;
  43
  44 namespace System.Runtime.Remoting.Channels
  45 {
  46
  47         // Holds the cross appdomain channel data (used to get/create the correct sink)
  48         [Serializable]
  49         internal class CrossAppDomainData
  50         {
  51                 // TODO: Add context support
  52                 // Required for .NET compatibility
  53 #pragma warning disable 0414
  54                 private object _ContextID;
  55 #pragma warning restore
  56                 private int _DomainID;
  57                 private string _processGuid;
  58
  59                 internal CrossAppDomainData(int domainId)
  60                 {
  61                         _ContextID = (int) 0;
  62                         _DomainID = domainId;
  63                         _processGuid = RemotingConfiguration.ProcessId;
  64                 }
  65
  66                 internal int DomainID
  67                 {
  68                         get { return _DomainID; }
  69                 }
  70
  71                 internal string ProcessID
  72                 {
  73                         get { return _processGuid; }
  74                 }
  75         }
  76
  77         // Responsible for marshalling objects between appdomains
  78         [Serializable]
  79         internal class CrossAppDomainChannel : IChannel, IChannelSender, IChannelReceiver
  80         {
  81                 private const String _strName = "MONOCAD";
  82
  83                 private static Object s_lock = new Object();
  84
  85                 internal static void RegisterCrossAppDomainChannel()
  86                 {
  87                         lock (s_lock)
  88                         {
  89                                 // todo: make singleton
  90                                 CrossAppDomainChannel monocad = new CrossAppDomainChannel();
  91                                 ChannelServices.RegisterChannel ((IChannel) monocad);
  92                         }
  93                 }
  94
  95                 // IChannel implementation
  96                 public virtual String ChannelName
  97                 {
  98                         get { return _strName; }
  99                 }
 100
 101                 public virtual int ChannelPriority
 102                 {
 103                         get { return 100; }
 104                 }
 105
 106                 public String Parse(String url, out String objectURI)
 107                 {
 108                         objectURI = url;
 109                         return null;
 110                 }
 111
 112                 // IChannelReceiver
 113                 public virtual Object ChannelData
 114                 {
 115                         get { return new CrossAppDomainData(Thread.GetDomainID()); }
 116                 }
 117
 118                 public virtual String[] GetUrlsForUri(String objectURI)
 119                 {
 120                         throw new NotSupportedException("CrossAppdomain channel dont support UrlsForUri");
 121                 }
 122
 123                 // Dummies
 124                 public virtual void StartListening(Object data) {}
 125                 public virtual void StopListening(Object data) {}
 126
 127                 // IChannelSender
 128                 public virtual IMessageSink CreateMessageSink(String url, Object data, out String uri)
 129                 {
 130                         uri = null;
 131
 132                         if (data != null)
 133                         {
 134                                 // Get the data and then get the sink
 135                                 CrossAppDomainData cadData = data as CrossAppDomainData;
 136                                 if (cadData != null && cadData.ProcessID == RemotingConfiguration.ProcessId)
 137                                         // GetSink creates a new sink if we don't have any (use contexts here later)
 138                                         return CrossAppDomainSink.GetSink(cadData.DomainID);
 139                         }
 140                         if (url != null && url.StartsWith(_strName))
 141                                 throw new NotSupportedException("Can't create a named channel via crossappdomain");
 142
 143                         return null;
 144                 }
 145         }
 146
 147         [MonoTODO("Handle domain unloading?")]
 148         internal class CrossAppDomainSink : IMessageSink
 149         {
 150                 private static Hashtable s_sinks = new Hashtable();
 151
 152                 private static MethodInfo processMessageMethod =
 153                         typeof (CrossAppDomainSink).GetMethod ("ProcessMessageInDomain", BindingFlags.NonPublic|BindingFlags.Static);
 154
 155
 156                 private int _domainID;
 157
 158                 internal CrossAppDomainSink(int domainID)
 159                 {
 160                         _domainID = domainID;
 161                 }
 162
 163                 internal static CrossAppDomainSink GetSink(int domainID)
 164                 {
 165                         // Check if we have a sink for the current domainID
 166                         // note, locking is not to bad here, very few class to GetSink
 167                         lock (s_sinks.SyncRoot)
 168                         {
 169                                 if (s_sinks.ContainsKey(domainID))
 170                                         return (CrossAppDomainSink) s_sinks[domainID];
 171                                 else
 172                                 {
 173                                         CrossAppDomainSink sink = new CrossAppDomainSink(domainID);
 174                                         s_sinks[domainID] = sink;
 175
 176                                         return sink;
 177                                 }
 178                         }
 179                 }
 180
 181                 internal int TargetDomainId {
 182                         get { return _domainID; }
 183                 }
 184
 185                 private struct ProcessMessageRes {
 186                         public byte[] arrResponse;
 187                         public CADMethodReturnMessage cadMrm;
 188                 }
 189
 190 #pragma warning disable 169
 191                 private static ProcessMessageRes ProcessMessageInDomain (
 192                         byte[] arrRequest,
 193                         CADMethodCallMessage cadMsg)
 194             {
 195                         ProcessMessageRes res = new ProcessMessageRes ();
 196
 197                         try
 198                         {
 199                                 AppDomain.CurrentDomain.ProcessMessageInDomain (arrRequest, cadMsg, out res.arrResponse, out res.cadMrm);
 200                         }
 201                         catch (Exception e)
 202                         {
 203                                 IMessage errorMsg = new MethodResponse (e, new ErrorMessage());
 204                                 res.arrResponse = CADSerializer.SerializeMessage (errorMsg).GetBuffer();
 205                         }
 206                         return res;
 207                 }
 208 #pragma warning restore 169
 209
 210                 public virtual IMessage SyncProcessMessage(IMessage msgRequest)
 211                 {
 212                         IMessage retMessage = null;
 213
 214                         try
 215                         {
 216                                 // Time to transit into the "our" domain
 217                                 byte [] arrResponse = null;
 218                                 byte [] arrRequest = null;
 219
 220                                 CADMethodReturnMessage cadMrm = null;
 221                                 CADMethodCallMessage cadMsg;
 222
 223                                 cadMsg = CADMethodCallMessage.Create (msgRequest);
 224                                 if (null == cadMsg) {
 225                                         // Serialize the request message
 226                                         MemoryStream reqMsgStream = CADSerializer.SerializeMessage(msgRequest);
 227                                         arrRequest = reqMsgStream.GetBuffer();
 228                                 }
 229
 230                                 Context currentContext = Thread.CurrentContext;
 231
 232                                 try {
 233                                         // InternalInvoke can't handle out arguments, this is why
 234                                         // we return the results in a structure
 235                                         ProcessMessageRes res = (ProcessMessageRes)AppDomain.InvokeInDomainByID (_domainID, processMessageMethod, null, new object [] { arrRequest, cadMsg });
 236                                         arrResponse = res.arrResponse;
 237                                         cadMrm = res.cadMrm;
 238                                 } finally {
 239                                         AppDomain.InternalSetContext (currentContext);
 240                                 }
 241
 242
 243                                 if (null != arrResponse) {
 244                                         // Time to deserialize the message
 245                                         MemoryStream respMsgStream = new MemoryStream(arrResponse);
 246
 247                                         // Deserialize the response message
 248                                         retMessage = CADSerializer.DeserializeMessage(respMsgStream, msgRequest as IMethodCallMessage);
 249                                 } else
 250                                         retMessage = new MethodResponse (msgRequest as IMethodCallMessage, cadMrm);
 251                         }
 252                         catch (Exception e)
 253                         {
 254                                 try
 255                                 {
 256                                         retMessage = new ReturnMessage (e, msgRequest as IMethodCallMessage);
 257                                 }
 258                                 catch (Exception)
 259                                 {
 260                                         // this is just to be sure
 261                                 }
 262                         }
 263
 264                 return retMessage;
 265                 }
 266
 267                 public virtual IMessageCtrl AsyncProcessMessage (IMessage reqMsg, IMessageSink replySink)
 268                 {
 269                         AsyncRequest req = new AsyncRequest (reqMsg, replySink);
 270                         ThreadPool.QueueUserWorkItem (new WaitCallback (SendAsyncMessage), req);
 271                         return null;
 272                 }
 273
 274                 public void SendAsyncMessage (object data)
 275                 {
 276                         AsyncRequest req = (AsyncRequest)data;
 277                         IMessage response = SyncProcessMessage (req.MsgRequest);
 278                         req.ReplySink.SyncProcessMessage (response);
 279                 }
 280
 281                 public IMessageSink NextSink { get { return null; } }
 282         }
 283
 284         internal class CADSerializer
 285         {
 286                 internal static IMessage DeserializeMessage(MemoryStream mem, IMethodCallMessage msg)
 287                 {
 288                         BinaryFormatter serializer = new BinaryFormatter();
 289
 290                         serializer.SurrogateSelector = null;
 291                         mem.Position = 0;
 292
 293                         if (msg == null)
 294                                 return (IMessage) serializer.Deserialize(mem, null);
 295                         else
 296                                 return (IMessage) serializer.DeserializeMethodResponse(mem, null, msg);
 297                 }
 298
 299                 internal static MemoryStream SerializeMessage(IMessage msg)
 300                 {
 301                         MemoryStream mem = new MemoryStream ();
 302                         BinaryFormatter serializer = new BinaryFormatter ();
 303
 304                         serializer.SurrogateSelector = new RemotingSurrogateSelector ();
 305                         serializer.Serialize (mem, msg);
 306
 307                         mem.Position = 0;
 308
 309                         return mem;
 310                 }
 311
 312                 internal static MemoryStream SerializeObject(object obj)
 313                 {
 314                         MemoryStream mem = new MemoryStream ();
 315                         BinaryFormatter serializer = new BinaryFormatter ();
 316
 317                         serializer.SurrogateSelector = new RemotingSurrogateSelector ();
 318                         serializer.Serialize (mem, obj);
 319
 320                         mem.Position = 0;
 321
 322                         return mem;
 323                 }
 324
 325                 internal static object DeserializeObject(MemoryStream mem)
 326                 {
 327                         BinaryFormatter serializer = new BinaryFormatter();
 328
 329                         serializer.SurrogateSelector = null;
 330                         mem.Position = 0;
 331
 332                         return serializer.Deserialize (mem);
 333                 }
 334         }
 335
 336         internal class AsyncRequest
 337         {
 338                 internal IMessageSink ReplySink;
 339                 internal IMessage MsgRequest;
 340
 341                 public AsyncRequest (IMessage msgRequest, IMessageSink replySink)
 342                 {
 343                         ReplySink = replySink;
 344                         MsgRequest = msgRequest;
 345                 }
 346         }
 347
 348 }