mcs/class/corlib/System.Runtime.Remoting/RemotingServices.cs

   1 //
   2 // System.Runtime.Remoting.RemotingServices.cs
   3 //
   4 // Authors:
   5 //   Dietmar Maurer (dietmar@ximian.com)
   6 //   Lluis Sanchez Gual (lluis@ideary.com)
   7 //   Patrik Torstensson
   8 //
   9 // (C) 2001 Ximian, Inc.  http://www.ximian.com
  10 // Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Diagnostics;
  33 using System.Text;
  34 using System.Reflection;
  35 using System.Threading;
  36 using System.Collections;
  37 using System.Runtime.Remoting.Messaging;
  38 using System.Runtime.Remoting.Proxies;
  39 using System.Runtime.Remoting.Channels;
  40 using System.Runtime.Remoting.Contexts;
  41 using System.Runtime.Remoting.Activation;
  42 using System.Runtime.Remoting.Lifetime;
  43 using System.Runtime.CompilerServices;
  44 using System.Runtime.Serialization;
  45 using System.Runtime.Serialization.Formatters.Binary;
  46 using System.IO;
  47 using System.Runtime.Remoting.Services;
  48 using System.Security.Permissions;
  49 using System.Runtime.ConstrainedExecution;
  50 using System.Runtime.Serialization.Formatters;
  51
  52 namespace System.Runtime.Remoting
  53 {
  54         [System.Runtime.InteropServices.ComVisible (true)]
  55 #if NET_4_0
  56         static
  57 #else
  58         sealed
  59 #endif
  60         public class RemotingServices
  61         {
  62                 // Holds the identities of the objects, using uri as index
  63                 static Hashtable uri_hash = new Hashtable ();
  64
  65                 static BinaryFormatter _serializationFormatter;
  66                 static BinaryFormatter _deserializationFormatter;
  67
  68                 static string app_id;
  69                 static readonly object app_id_lock = new object ();
  70
  71                 static int next_id = 1;
  72                 const BindingFlags methodBindings = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
  73                 static readonly MethodInfo FieldSetterMethod;
  74                 static readonly MethodInfo FieldGetterMethod;
  75
  76                 // Holds information in xdomain calls. Names are short to minimize serialized size.
  77                 [Serializable]
  78                 class CACD {
  79                         public object d;        /* call data */
  80                         public object c;        /* call context */
  81                 }
  82
  83                 static RemotingServices ()
  84                 {
  85                         RemotingSurrogateSelector surrogateSelector = new RemotingSurrogateSelector ();
  86                         StreamingContext context = new StreamingContext (StreamingContextStates.Remoting, null);
  87                         _serializationFormatter = new BinaryFormatter (surrogateSelector, context);
  88                         _deserializationFormatter = new BinaryFormatter (null, context);
  89                         _serializationFormatter.AssemblyFormat = FormatterAssemblyStyle.Full;
  90                         _deserializationFormatter.AssemblyFormat = FormatterAssemblyStyle.Full;
  91
  92                         RegisterInternalChannels ();
  93                         CreateWellKnownServerIdentity (typeof(RemoteActivator), "RemoteActivationService.rem", WellKnownObjectMode.Singleton);
  94
  95                         FieldSetterMethod = typeof(object).GetMethod ("FieldSetter", BindingFlags.NonPublic|BindingFlags.Instance);
  96                         FieldGetterMethod = typeof(object).GetMethod ("FieldGetter", BindingFlags.NonPublic|BindingFlags.Instance);
  97                 }
  98 #if !NET_4_0
  99                 private RemotingServices () {}
 100 #endif
 101
 102                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 103                 internal extern static object InternalExecute (MethodBase method, Object obj,
 104                                                                Object[] parameters, out object [] out_args);
 105
 106                 // Returns the actual implementation of @method in @type.
 107                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 108                 internal extern static MethodBase GetVirtualMethod (Type type, MethodBase method);
 109
 110 #if DISABLE_REMOTING
 111                 public static bool IsTransparentProxy (object proxy)
 112                 {
 113                         throw new NotSupportedException ();
 114                 }
 115 #else
 116                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 117                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 118                 public extern static bool IsTransparentProxy (object proxy);
 119 #endif
 120
 121                 internal static IMethodReturnMessage InternalExecuteMessage (
 122                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 123                 {
 124                         ReturnMessage result;
 125
 126                         Type tt = target.GetType ();
 127                         MethodBase method;
 128                         if (reqMsg.MethodBase.DeclaringType == tt ||
 129                             reqMsg.MethodBase == FieldSetterMethod ||
 130                             reqMsg.MethodBase == FieldGetterMethod) {
 131                                 method = reqMsg.MethodBase;
 132                         } else {
 133                                 method = GetVirtualMethod (tt, reqMsg.MethodBase);
 134
 135                                 if (method == null)
 136                                         throw new RemotingException (
 137                                                 String.Format ("Cannot resolve method {0}:{1}", tt, reqMsg.MethodName));
 138                         }
 139
 140                         if (reqMsg.MethodBase.IsGenericMethod) {
 141                                 Type[] genericArguments = reqMsg.MethodBase.GetGenericArguments ();
 142                                 MethodInfo gmd = ((MethodInfo)method).GetGenericMethodDefinition ();
 143                                 method = gmd.MakeGenericMethod (genericArguments);
 144                         }
 145
 146                         object oldContext = CallContext.SetCurrentCallContext (reqMsg.LogicalCallContext);
 147
 148                         try
 149                         {
 150                                 object [] out_args;
 151                                 object rval = InternalExecute (method, target, reqMsg.Args, out out_args);
 152
 153                                 // Collect parameters with Out flag from the request message
 154                                 // FIXME: This can be done in the unmanaged side and will be
 155                                 // more efficient
 156
 157                                 ParameterInfo[] parameters = method.GetParameters();
 158                                 object[] returnArgs = new object [parameters.Length];
 159
 160                                 int n = 0;
 161                                 int noa = 0;
 162                                 foreach (ParameterInfo par in parameters)
 163                                 {
 164                                         if (par.IsOut && !par.ParameterType.IsByRef)
 165                                                 returnArgs [n++] = reqMsg.GetArg (par.Position);
 166                                         else if (par.ParameterType.IsByRef)
 167                                                 returnArgs [n++] = out_args [noa++];
 168                                         else
 169                                                 returnArgs [n++] = null;
 170                                 }
 171
 172                                 result = new ReturnMessage (rval, returnArgs, n, CallContext.CreateLogicalCallContext (true), reqMsg);
 173                         }
 174                         catch (Exception e)
 175                         {
 176                                 result = new ReturnMessage (e, reqMsg);
 177                         }
 178
 179                         CallContext.RestoreCallContext (oldContext);
 180                         return result;
 181                 }
 182
 183                 public static IMethodReturnMessage ExecuteMessage (
 184                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 185                 {
 186                         if (IsTransparentProxy(target))
 187                         {
 188                                 // Message must go through all chain of sinks
 189                                 RealProxy rp = GetRealProxy (target);
 190                                 return (IMethodReturnMessage) rp.Invoke (reqMsg);
 191                         }
 192                         else    // Direct call
 193                                 return InternalExecuteMessage (target, reqMsg);
 194                 }
 195
 196                 [System.Runtime.InteropServices.ComVisible (true)]
 197                 public static object Connect (Type classToProxy, string url)
 198                 {
 199                         ObjRef objRef = new ObjRef (classToProxy, url, null);
 200                         return GetRemoteObject (objRef, classToProxy);
 201                 }
 202
 203                 [System.Runtime.InteropServices.ComVisible (true)]
 204                 public static object Connect (Type classToProxy, string url, object data)
 205                 {
 206                         ObjRef objRef = new ObjRef (classToProxy, url, data);
 207                         return GetRemoteObject (objRef, classToProxy);
 208                 }
 209
 210                 public static bool Disconnect (MarshalByRefObject obj)
 211                 {
 212                         if (obj == null) throw new ArgumentNullException ("obj");
 213
 214                         ServerIdentity identity;
 215
 216                         if (IsTransparentProxy (obj))
 217                         {
 218                                 // CBOs are always accessed through a proxy, even in the server, so
 219                                 // for server CBOs it is ok to disconnect a proxy
 220
 221                                 RealProxy proxy = GetRealProxy(obj);
 222                                 if (proxy.GetProxiedType().IsContextful && (proxy.ObjectIdentity is ServerIdentity))
 223                                         identity = proxy.ObjectIdentity as ServerIdentity;
 224                                 else
 225                                         throw new ArgumentException ("The obj parameter is a proxy.");
 226                         }
 227                         else {
 228                                 identity = obj.ObjectIdentity;
 229                                 obj.ObjectIdentity = null;
 230                         }
 231
 232                         if (identity == null || !identity.IsConnected)
 233                                 return false;
 234                         else
 235                         {
 236                                 LifetimeServices.StopTrackingLifetime (identity);
 237                                 DisposeIdentity (identity);
 238                                 TrackingServices.NotifyDisconnectedObject (obj);
 239                                 return true;
 240                         }
 241                 }
 242
 243                 public static Type GetServerTypeForUri (string URI)
 244                 {
 245                         ServerIdentity ident = GetIdentityForUri (URI) as ServerIdentity;
 246                         if (ident == null) return null;
 247                         return ident.ObjectType;
 248                 }
 249
 250                 public static string GetObjectUri (MarshalByRefObject obj)
 251                 {
 252                         Identity ident = GetObjectIdentity(obj);
 253                         if (ident is ClientIdentity) return ((ClientIdentity)ident).TargetUri;
 254                         else if (ident != null) return ident.ObjectUri;
 255                         else return null;
 256                 }
 257
 258                 public static object Unmarshal (ObjRef objectRef)
 259                 {
 260                         return Unmarshal (objectRef, true);
 261                 }
 262
 263                 public static object Unmarshal (ObjRef objectRef, bool fRefine)
 264                 {
 265                         Type classToProxy = fRefine ? objectRef.ServerType : typeof (MarshalByRefObject);
 266                         if (classToProxy == null) classToProxy = typeof (MarshalByRefObject);
 267
 268                         if (objectRef.IsReferenceToWellKnow) {
 269                                 object obj = GetRemoteObject (objectRef, classToProxy);
 270                                 TrackingServices.NotifyUnmarshaledObject (obj, objectRef);
 271                                 return obj;
 272                         }
 273                         else
 274                         {
 275                                 object obj;
 276
 277                                 if (classToProxy.IsContextful) {
 278                                         // Look for a ProxyAttribute
 279                                         ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (classToProxy, typeof(ProxyAttribute), true);
 280                                         if (att != null) {
 281                                                 obj = att.CreateProxy (objectRef, classToProxy, null, null).GetTransparentProxy();
 282                                                 TrackingServices.NotifyUnmarshaledObject (obj, objectRef);
 283                                                 return obj;
 284                                         }
 285                                 }
 286                                 obj = GetProxyForRemoteObject (objectRef, classToProxy);
 287                                 TrackingServices.NotifyUnmarshaledObject (obj, objectRef);
 288                                 return obj;
 289                         }
 290                 }
 291
 292                 public static ObjRef Marshal (MarshalByRefObject Obj)
 293                 {
 294                         return Marshal (Obj, null, null);
 295                 }
 296
 297                 public static ObjRef Marshal (MarshalByRefObject Obj, string URI)
 298                 {
 299                         return Marshal (Obj, URI, null);
 300                 }
 301
 302                 public static ObjRef Marshal (MarshalByRefObject Obj, string ObjURI, Type RequestedType)
 303                 {
 304                         if (IsTransparentProxy (Obj))
 305                         {
 306                                 RealProxy proxy = RemotingServices.GetRealProxy (Obj);
 307                                 Identity identity = proxy.ObjectIdentity;
 308
 309                                 if (identity != null)
 310                                 {
 311                                         if (proxy.GetProxiedType().IsContextful && !identity.IsConnected)
 312                                         {
 313                                                 // Unregistered local contextbound object. Register now.
 314                                                 ClientActivatedIdentity cboundIdentity = (ClientActivatedIdentity)identity;
 315                                                 if (ObjURI == null) ObjURI = NewUri();
 316                                                 cboundIdentity.ObjectUri = ObjURI;
 317                                                 RegisterServerIdentity (cboundIdentity);
 318                                                 cboundIdentity.StartTrackingLifetime ((ILease)Obj.InitializeLifetimeService());
 319                                                 return cboundIdentity.CreateObjRef (RequestedType);
 320                                         }
 321                                         else if (ObjURI != null)
 322                                                 throw new RemotingException ("It is not possible marshal a proxy of a remote object.");
 323
 324                                         ObjRef or = proxy.ObjectIdentity.CreateObjRef (RequestedType);
 325                                         TrackingServices.NotifyMarshaledObject (Obj, or);
 326                                         return or;
 327                                 }
 328                         }
 329
 330                         if (RequestedType == null) RequestedType = Obj.GetType ();
 331
 332                         if (ObjURI == null)
 333                         {
 334                                 if (Obj.ObjectIdentity == null)
 335                                 {
 336                                         ObjURI = NewUri();
 337                                         CreateClientActivatedServerIdentity (Obj, RequestedType, ObjURI);
 338                                 }
 339                         }
 340                         else
 341                         {
 342                                 ClientActivatedIdentity identity = GetIdentityForUri ("/" + ObjURI) as ClientActivatedIdentity;
 343                                 if (identity == null || Obj != identity.GetServerObject())
 344                                         CreateClientActivatedServerIdentity (Obj, RequestedType, ObjURI);
 345                         }
 346
 347                         ObjRef oref;
 348
 349                         if (IsTransparentProxy (Obj))
 350                                 oref = RemotingServices.GetRealProxy (Obj).ObjectIdentity.CreateObjRef (RequestedType);
 351                         else
 352                                 oref = Obj.CreateObjRef (RequestedType);
 353
 354                         TrackingServices.NotifyMarshaledObject (Obj, oref);
 355                         return oref;
 356                 }
 357
 358                 static string NewUri ()
 359                 {
 360                         if (app_id == null) {
 361                                 lock (app_id_lock) {
 362                                         if (app_id == null)
 363                                                 app_id = Guid.NewGuid().ToString().Replace('-', '_') + "/";
 364                                 }
 365                         }
 366
 367                         int n = Interlocked.Increment (ref next_id);
 368                         return app_id + Environment.TickCount.ToString("x") + "_" + n + ".rem";
 369                 }
 370
 371                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 372                 public static RealProxy GetRealProxy (object proxy)
 373                 {
 374                         if (!IsTransparentProxy(proxy)) throw new RemotingException("Cannot get the real proxy from an object that is not a transparent proxy.");
 375                         return (RealProxy)((TransparentProxy)proxy)._rp;
 376                 }
 377
 378                 public static MethodBase GetMethodBaseFromMethodMessage(IMethodMessage msg)
 379                 {
 380                         Type type = Type.GetType (msg.TypeName);
 381                         if (type == null)
 382                                 throw new RemotingException ("Type '" + msg.TypeName + "' not found.");
 383
 384                         return GetMethodBaseFromName (type, msg.MethodName, (Type[]) msg.MethodSignature);
 385                 }
 386
 387                 internal static MethodBase GetMethodBaseFromName (Type type, string methodName, Type[] signature)
 388                 {
 389                         if (type.IsInterface) {
 390                                 return FindInterfaceMethod (type, methodName, signature);
 391                         }
 392                         else {
 393                                 MethodBase method = null;
 394                                 if (signature == null)
 395                                         method = type.GetMethod (methodName, methodBindings);
 396                                 else
 397                                         method = type.GetMethod (methodName, methodBindings, null, (Type[]) signature, null);
 398
 399                                 if (method != null)
 400                                         return method;
 401
 402                                 if (methodName == "FieldSetter")
 403                                         return FieldSetterMethod;
 404
 405                                 if (methodName == "FieldGetter")
 406                                         return FieldGetterMethod;
 407
 408                                 if (signature == null)
 409                                         return type.GetConstructor (methodBindings, null, Type.EmptyTypes, null);
 410                                 else
 411                                         return type.GetConstructor (methodBindings, null, signature, null);
 412                         }
 413                 }
 414
 415                 static MethodBase FindInterfaceMethod (Type type, string methodName, Type[] signature)
 416                 {
 417                         MethodBase method = null;
 418
 419                         if (signature == null)
 420                                 method = type.GetMethod (methodName, methodBindings);
 421                         else
 422                                 method = type.GetMethod (methodName, methodBindings, null, signature, null);
 423
 424                         if (method != null) return method;
 425
 426                         foreach (Type t in type.GetInterfaces ()) {
 427                                 method = FindInterfaceMethod (t, methodName, signature);
 428                                 if (method != null) return method;
 429                         }
 430
 431                         return null;
 432                 }
 433
 434                 public static void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
 435                 {
 436                         if (obj == null) throw new ArgumentNullException ("obj");
 437
 438                         ObjRef oref = Marshal ((MarshalByRefObject)obj);
 439                         oref.GetObjectData (info, context);
 440                 }
 441
 442                 public static ObjRef GetObjRefForProxy(MarshalByRefObject obj)
 443                 {
 444                         Identity ident = GetObjectIdentity(obj);
 445                         if (ident == null) return null;
 446                         else return ident.CreateObjRef(null);
 447                 }
 448
 449                 public static object GetLifetimeService (MarshalByRefObject obj)
 450                 {
 451                         if (obj == null) return null;
 452                         return obj.GetLifetimeService ();
 453                 }
 454
 455                 public static IMessageSink GetEnvoyChainForProxy (MarshalByRefObject obj)
 456                 {
 457                         if (IsTransparentProxy(obj))
 458                                 return ((ClientIdentity)GetRealProxy (obj).ObjectIdentity).EnvoySink;
 459                         else
 460                                 throw new ArgumentException ("obj must be a proxy.","obj");
 461                 }
 462
 463                 [MonoTODO]
 464                 [Conditional ("REMOTING_PERF")]
 465                 [Obsolete ("It existed for only internal use in .NET and unimplemented in mono")]
 466                 public static void LogRemotingStage (int stage)
 467                 {
 468                         throw new NotImplementedException ();
 469                 }
 470
 471                 public static string GetSessionIdForMethodMessage(IMethodMessage msg)
 472                 {
 473                         // It seems that this it what MS returns.
 474                         return msg.Uri;
 475                 }
 476
 477                 public static bool IsMethodOverloaded(IMethodMessage msg)
 478                 {
 479                         const BindingFlags bfinst = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance;
 480                         MonoType type = (MonoType) msg.MethodBase.DeclaringType;
 481                         return type.GetMethodsByName (msg.MethodName, bfinst, false, type).Length > 1;
 482                 }
 483
 484                 public static bool IsObjectOutOfAppDomain(object tp)
 485                 {
 486                         MarshalByRefObject mbr = tp as MarshalByRefObject;
 487
 488                         if (mbr == null)
 489                                 return false;
 490
 491                         // TODO: use internal call for better performance
 492                         Identity ident = GetObjectIdentity (mbr);
 493                         return ident is ClientIdentity;
 494                 }
 495
 496                 public static bool IsObjectOutOfContext(object tp)
 497                 {
 498                         MarshalByRefObject mbr = tp as MarshalByRefObject;
 499
 500                         if (mbr == null)
 501                                 return false;
 502
 503                         // TODO: use internal call for better performance
 504                         Identity ident = GetObjectIdentity (mbr);
 505                         if (ident == null) return false;
 506
 507                         ServerIdentity sident = ident as ServerIdentity;
 508                         if (sident != null) return sident.Context != System.Threading.Thread.CurrentContext;
 509                         else return true;
 510                 }
 511
 512                 public static bool IsOneWay(MethodBase method)
 513                 {
 514                         return method.IsDefined (typeof (OneWayAttribute), false);
 515                 }
 516
 517                 internal static bool IsAsyncMessage(IMessage msg)
 518                 {
 519                         if (! (msg is MonoMethodMessage)) return false;
 520                         else if (((MonoMethodMessage)msg).IsAsync) return true;
 521                         else if (IsOneWay (((MonoMethodMessage)msg).MethodBase)) return true;
 522                         else return false;
 523                 }
 524
 525                 public static void SetObjectUriForMarshal(MarshalByRefObject obj, string uri)
 526                 {
 527                         if (IsTransparentProxy (obj)) {
 528                                 RealProxy proxy = RemotingServices.GetRealProxy(obj);
 529                                 Identity identity = proxy.ObjectIdentity;
 530
 531                                 if (identity != null && !(identity is ServerIdentity) && !proxy.GetProxiedType().IsContextful)
 532                                         throw new RemotingException ("SetObjectUriForMarshal method should only be called for MarshalByRefObjects that exist in the current AppDomain.");
 533                         }
 534
 535                         Marshal (obj, uri);
 536                 }
 537
 538                 #region Internal Methods
 539
 540                 internal static object CreateClientProxy (ActivatedClientTypeEntry entry, object[] activationAttributes)
 541                 {
 542                         if (entry.ContextAttributes != null || activationAttributes != null)
 543                         {
 544                                 ArrayList props = new ArrayList ();
 545                                 if (entry.ContextAttributes != null) props.AddRange (entry.ContextAttributes);
 546                                 if (activationAttributes != null) props.AddRange (activationAttributes);
 547                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, props.ToArray ());
 548                         }
 549                         else
 550                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, null);
 551                 }
 552
 553                 internal static object CreateClientProxy (Type objectType, string url, object[] activationAttributes)
 554                 {
 555                         string activationUrl = url;
 556                         if (!activationUrl.EndsWith ("/"))
 557                                 activationUrl += "/";
 558                         activationUrl += "RemoteActivationService.rem";
 559
 560                         string objectUri;
 561                         GetClientChannelSinkChain (activationUrl, null, out objectUri);
 562
 563                         RemotingProxy proxy = new RemotingProxy (objectType, activationUrl, activationAttributes);
 564                         return proxy.GetTransparentProxy();
 565                 }
 566
 567                 internal static object CreateClientProxy (WellKnownClientTypeEntry entry)
 568                 {
 569                         return Connect (entry.ObjectType, entry.ObjectUrl, null);
 570                 }
 571
 572                 internal static object CreateClientProxyForContextBound (Type type, object[] activationAttributes)
 573                 {
 574                         if (type.IsContextful)
 575                         {
 576                                 // Look for a ProxyAttribute
 577                                 ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (type, typeof(ProxyAttribute), true);
 578                                 if (att != null)
 579                                         return att.CreateInstance (type);
 580                         }
 581                         RemotingProxy proxy = new RemotingProxy (type, ChannelServices.CrossContextUrl, activationAttributes);
 582                         return proxy.GetTransparentProxy();
 583                 }
 584 #if !NET_2_1
 585                 internal static object CreateClientProxyForComInterop (Type type)
 586                 {
 587                         Mono.Interop.ComInteropProxy proxy = Mono.Interop.ComInteropProxy.CreateProxy (type);
 588                         return proxy.GetTransparentProxy ();
 589                 }
 590 #endif
 591                 internal static Identity GetIdentityForUri (string uri)
 592                 {
 593                         string normUri = GetNormalizedUri (uri);
 594                         lock (uri_hash)
 595                         {
 596                                 Identity i = (Identity) uri_hash [normUri];
 597
 598                                 if (i == null) {
 599                                         normUri = RemoveAppNameFromUri (uri);
 600                                         if (normUri != null)
 601                                                 i = (Identity) uri_hash [normUri];
 602                                 }
 603
 604                                 return i;
 605                         }
 606                 }
 607
 608                 //
 609                 // If the specified uri starts with the application name,
 610                 // RemoveAppNameFromUri returns the uri w/out the leading
 611                 // application name, otherwise it returns null.
 612                 //
 613                 // Assumes that the uri is not normalized.
 614                 //
 615                 static string RemoveAppNameFromUri (string uri)
 616                 {
 617                         string name = RemotingConfiguration.ApplicationName;
 618                         if (name == null) return null;
 619                         name = "/" + name + "/";
 620                         if (uri.StartsWith (name))
 621                                 return uri.Substring (name.Length);
 622                         else
 623                                 return null;
 624                 }
 625
 626                 internal static Identity GetObjectIdentity (MarshalByRefObject obj)
 627                 {
 628                         if (IsTransparentProxy(obj))
 629                                 return GetRealProxy (obj).ObjectIdentity;
 630                         else
 631                                 return obj.ObjectIdentity;
 632                 }
 633
 634                 internal static ClientIdentity GetOrCreateClientIdentity(ObjRef objRef, Type proxyType, out object clientProxy)
 635                 {
 636                         // This method looks for an identity for the given url.
 637                         // If an identity is not found, it creates the identity and
 638                         // assigns it a proxy to the remote object.
 639
 640                         // Creates the client sink chain for the given url or channelData.
 641                         // It will also get the object uri from the url.
 642
 643                         object channelData = objRef.ChannelInfo != null ? objRef.ChannelInfo.ChannelData : null;
 644
 645                         string objectUri;
 646                         IMessageSink sink = GetClientChannelSinkChain (objRef.URI, channelData, out objectUri);
 647
 648                         if (objectUri == null) objectUri = objRef.URI;
 649
 650                         lock (uri_hash)
 651                         {
 652                                 clientProxy = null;
 653                                 string uri = GetNormalizedUri (objRef.URI);
 654
 655                                 ClientIdentity identity = uri_hash [uri] as ClientIdentity;
 656                                 if (identity != null)
 657                                 {
 658                                         // Object already registered
 659                                         clientProxy = identity.ClientProxy;
 660                                         if (clientProxy != null) return identity;
 661
 662                                         // The proxy has just been GCed, so its identity cannot
 663                                         // be reused. Just dispose it.
 664                                         DisposeIdentity (identity);
 665                                 }
 666
 667                                 // Creates an identity and a proxy for the remote object
 668
 669                                 identity = new ClientIdentity (objectUri, objRef);
 670                                 identity.ChannelSink = sink;
 671
 672                                 // Registers the identity
 673                                 uri_hash [uri] = identity;
 674                                 if (proxyType != null)
 675                                 {
 676                                         RemotingProxy proxy = new RemotingProxy (proxyType, identity);
 677                                         CrossAppDomainSink cds = sink as CrossAppDomainSink;
 678                                         if (cds != null)
 679                                                 proxy.SetTargetDomain (cds.TargetDomainId);
 680
 681                                         clientProxy = proxy.GetTransparentProxy();
 682                                         identity.ClientProxy = (MarshalByRefObject) clientProxy;
 683                                 }
 684                                 return identity;
 685                         }
 686                 }
 687
 688                 static IMessageSink GetClientChannelSinkChain(string url, object channelData, out string objectUri)
 689                 {
 690                         IMessageSink sink = ChannelServices.CreateClientChannelSinkChain (url, channelData, out objectUri);
 691                         if (sink == null)
 692                         {
 693                                 if (url != null)
 694                                 {
 695                                         string msg = String.Format ("Cannot create channel sink to connect to URL {0}. An appropriate channel has probably not been registered.", url);
 696                                         throw new RemotingException (msg);
 697                                 }
 698                                 else
 699                                 {
 700                                         string msg = String.Format ("Cannot create channel sink to connect to the remote object. An appropriate channel has probably not been registered.", url);
 701                                         throw new RemotingException (msg);
 702                                 }
 703                         }
 704                         return sink;
 705                 }
 706
 707                 internal static ClientActivatedIdentity CreateContextBoundObjectIdentity(Type objectType)
 708                 {
 709                         ClientActivatedIdentity identity = new ClientActivatedIdentity (null, objectType);
 710                         identity.ChannelSink = ChannelServices.CrossContextChannel;
 711                         return identity;
 712                 }
 713
 714                 internal static ClientActivatedIdentity CreateClientActivatedServerIdentity(MarshalByRefObject realObject, Type objectType, string objectUri)
 715                 {
 716                         ClientActivatedIdentity identity = new ClientActivatedIdentity (objectUri, objectType);
 717                         identity.AttachServerObject (realObject, Context.DefaultContext);
 718                         RegisterServerIdentity (identity);
 719                         identity.StartTrackingLifetime ((ILease)realObject.InitializeLifetimeService ());
 720                         return identity;
 721                 }
 722
 723                 internal static ServerIdentity CreateWellKnownServerIdentity(Type objectType, string objectUri, WellKnownObjectMode mode)
 724                 {
 725                         ServerIdentity identity;
 726
 727                         if (mode == WellKnownObjectMode.SingleCall)
 728                                 identity = new  SingleCallIdentity(objectUri, Context.DefaultContext, objectType);
 729                         else
 730                                 identity = new  SingletonIdentity(objectUri, Context.DefaultContext, objectType);
 731
 732                         RegisterServerIdentity (identity);
 733                         return identity;
 734                 }
 735
 736                 private static void RegisterServerIdentity(ServerIdentity identity)
 737                 {
 738                         lock (uri_hash)
 739                         {
 740                                 if (uri_hash.ContainsKey (identity.ObjectUri))
 741                                         throw new RemotingException ("Uri already in use: " + identity.ObjectUri + ".");
 742
 743                                 uri_hash[identity.ObjectUri] = identity;
 744                         }
 745                 }
 746
 747                 internal static object GetProxyForRemoteObject (ObjRef objref, Type classToProxy)
 748                 {
 749                         ClientActivatedIdentity identity = GetIdentityForUri (objref.URI) as ClientActivatedIdentity;
 750                         if (identity != null) return identity.GetServerObject ();
 751                         else return GetRemoteObject (objref, classToProxy);
 752                 }
 753
 754                 internal static object GetRemoteObject(ObjRef objRef, Type proxyType)
 755                 {
 756                         object proxy;
 757                         GetOrCreateClientIdentity (objRef, proxyType, out proxy);
 758                         return proxy;
 759                 }
 760
 761                 // This method is called by the runtime
 762                 internal static object GetServerObject (string uri)
 763                 {
 764                         ClientActivatedIdentity identity = GetIdentityForUri (uri) as ClientActivatedIdentity;
 765                         if (identity == null) throw new RemotingException ("Server for uri '" + uri + "' not found");
 766                         return identity.GetServerObject ();
 767                 }
 768
 769                 // This method is called by the runtime
 770                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 771                 internal static byte[] SerializeCallData (object obj)
 772                 {
 773                         LogicalCallContext ctx = CallContext.CreateLogicalCallContext (false);
 774                         if (ctx != null) {
 775                                 CACD cad = new CACD ();
 776                                 cad.d = obj;
 777                                 cad.c = ctx;
 778                                 obj = cad;
 779                         }
 780
 781                         if (obj == null) return null;
 782                         MemoryStream ms = new MemoryStream ();
 783                         _serializationFormatter.Serialize (ms, obj);
 784                         return ms.ToArray ();
 785                 }
 786
 787                 // This method is called by the runtime
 788                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 789                 internal static object DeserializeCallData (byte[] array)
 790                 {
 791                         if (array == null) return null;
 792
 793                         MemoryStream ms = new MemoryStream (array);
 794                         object obj = _deserializationFormatter.Deserialize (ms);
 795
 796                         if (obj is CACD) {
 797                                 CACD cad = (CACD) obj;
 798                                 obj = cad.d;
 799                                 CallContext.UpdateCurrentCallContext ((LogicalCallContext) cad.c);
 800                         }
 801                         return obj;
 802                 }
 803
 804                 // This method is called by the runtime
 805                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 806                 internal static byte[] SerializeExceptionData (Exception ex)
 807                 {
 808                         try {
 809                                 int retry = 4;
 810
 811                                 do {
 812                                         try {
 813                                                 MemoryStream ms = new MemoryStream ();
 814                                                 _serializationFormatter.Serialize (ms, ex);
 815                                                 return ms.ToArray ();
 816                                         }
 817                                         catch (Exception e) {
 818                                                 if (e is ThreadAbortException) {
 819                                                         Thread.ResetAbort ();
 820                                                         retry = 5;
 821                                                         ex = e;
 822                                                 }
 823                                                 else if (retry == 2) {
 824                                                         ex = new Exception ();
 825                                                         ex.SetMessage (e.Message);
 826                                                         ex.SetStackTrace (e.StackTrace);
 827                                                 }
 828                                                 else
 829                                                         ex = e;
 830                                         }
 831                                         retry--;
 832                                 }
 833                                 while (retry > 0);
 834
 835                                 return null;
 836                         }
 837                         catch (Exception tex)
 838                         {
 839                                 byte[] data = SerializeExceptionData (tex);
 840                                 Thread.ResetAbort ();
 841                                 return data;
 842                         }
 843                 }
 844
 845                 internal static object GetDomainProxy(AppDomain domain)
 846                 {
 847                         byte[] data = null;
 848
 849                         Context currentContext = Thread.CurrentContext;
 850
 851                         try
 852                         {
 853                                 data = (byte[])AppDomain.InvokeInDomain (domain, typeof (AppDomain).GetMethod ("GetMarshalledDomainObjRef", BindingFlags.Instance|BindingFlags.NonPublic), domain, null);
 854                         }
 855                         finally
 856                         {
 857                                 AppDomain.InternalSetContext (currentContext);
 858                         }
 859
 860                         byte[] data_copy = new byte [data.Length];
 861                         data.CopyTo (data_copy, 0);
 862                         MemoryStream stream = new MemoryStream (data_copy);
 863                         ObjRef appref = (ObjRef) CADSerializer.DeserializeObject (stream);
 864                         return (AppDomain) RemotingServices.Unmarshal(appref);
 865                 }
 866
 867                 private static void RegisterInternalChannels()
 868                 {
 869                         CrossAppDomainChannel.RegisterCrossAppDomainChannel();
 870                 }
 871
 872                 internal static void DisposeIdentity (Identity ident)
 873                 {
 874                         lock (uri_hash)
 875                         {
 876                                 if (!ident.Disposed) {
 877                                         ClientIdentity clientId = ident as ClientIdentity;
 878                                         if (clientId != null)
 879                                                 uri_hash.Remove (GetNormalizedUri (clientId.TargetUri));
 880                                         else
 881                                                 uri_hash.Remove (ident.ObjectUri);
 882
 883                                         ident.Disposed = true;
 884                                 }
 885                         }
 886                 }
 887
 888                 internal static Identity GetMessageTargetIdentity (IMessage msg)
 889                 {
 890                         // Returns the identity where the message is sent
 891
 892                         if (msg is IInternalMessage)
 893                                 return ((IInternalMessage)msg).TargetIdentity;
 894
 895                         lock (uri_hash)
 896                         {
 897                                 string uri = GetNormalizedUri (((IMethodMessage)msg).Uri);
 898                                 return uri_hash [uri] as ServerIdentity;
 899                         }
 900                 }
 901
 902                 internal static void SetMessageTargetIdentity (IMessage msg, Identity ident)
 903                 {
 904                         if (msg is IInternalMessage)
 905                                 ((IInternalMessage)msg).TargetIdentity = ident;
 906                 }
 907
 908                 internal static bool UpdateOutArgObject (ParameterInfo pi, object local, object remote)
 909                 {
 910                         if (pi.ParameterType.IsArray && ((Array)local).Rank == 1)
 911                         {
 912                                 Array alocal = (Array) local;
 913                                 if (alocal.Rank == 1)
 914                                 {
 915                                         Array.Copy ((Array) remote, alocal, alocal.Length);
 916                                         return true;
 917                                 }
 918                                 else
 919                                 {
 920                                         // TODO
 921                                 }
 922                         }
 923                         return false;
 924                 }
 925
 926                 static string GetNormalizedUri (string uri)
 927                 {
 928                         if (uri.StartsWith ("/")) return uri.Substring (1);
 929                         else return uri;
 930                 }
 931
 932                 #endregion
 933         }
 934 }