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
  50 #if NET_2_0
  51 using System.Runtime.ConstrainedExecution;
  52 using System.Runtime.Serialization.Formatters;
  53 #endif
  54
  55 namespace System.Runtime.Remoting
  56 {
  57 #if NET_2_0
  58         [System.Runtime.InteropServices.ComVisible (true)]
  59 #endif
  60         public sealed 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                 internal static string app_id;
  69                 static int next_id = 1;
  70                 static readonly BindingFlags methodBindings = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
  71                 static readonly MethodInfo FieldSetterMethod;
  72                 static readonly MethodInfo FieldGetterMethod;
  73
  74                 // Holds information in xdomain calls. Names are short to minimize serialized size.
  75                 [Serializable]
  76                 class CACD {
  77                         public object d;        /* call data */
  78                         public object c;        /* call context */
  79                 }
  80
  81                 static RemotingServices ()
  82                 {
  83                         RemotingSurrogateSelector surrogateSelector = new RemotingSurrogateSelector ();
  84                         StreamingContext context = new StreamingContext (StreamingContextStates.Remoting, null);
  85                         _serializationFormatter = new BinaryFormatter (surrogateSelector, context);
  86                         _deserializationFormatter = new BinaryFormatter (null, context);
  87 #if NET_2_0
  88                         _serializationFormatter.AssemblyFormat = FormatterAssemblyStyle.Full;
  89                         _deserializationFormatter.AssemblyFormat = FormatterAssemblyStyle.Full;
  90 #endif
  91
  92                         RegisterInternalChannels ();
  93                         app_id = Guid.NewGuid().ToString().Replace('-', '_') + "/";
  94                         CreateWellKnownServerIdentity (typeof(RemoteActivator), "RemoteActivationService.rem", WellKnownObjectMode.Singleton);
  95
  96                         FieldSetterMethod = typeof(object).GetMethod ("FieldSetter", BindingFlags.NonPublic|BindingFlags.Instance);
  97                         FieldGetterMethod = typeof(object).GetMethod ("FieldGetter", BindingFlags.NonPublic|BindingFlags.Instance);
  98                 }
  99
 100                 private RemotingServices () {}
 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 NET_2_0
 111                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 112 #endif
 113                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 114                 public extern static bool IsTransparentProxy (object proxy);
 115
 116                 internal static IMethodReturnMessage InternalExecuteMessage (
 117                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 118                 {
 119                         ReturnMessage result;
 120
 121                         Type tt = target.GetType ();
 122                         MethodBase method;
 123                         if (reqMsg.MethodBase.DeclaringType == tt ||
 124                             reqMsg.MethodBase == FieldSetterMethod ||
 125                             reqMsg.MethodBase == FieldGetterMethod) {
 126                                 method = reqMsg.MethodBase;
 127                         } else {
 128                                 method = GetVirtualMethod (tt, reqMsg.MethodBase);
 129
 130                                 if (method == null)
 131                                         throw new RemotingException (
 132                                                 String.Format ("Cannot resolve method {0}:{1}", tt, reqMsg.MethodName));
 133                         }
 134
 135 #if NET_2_0
 136                         if (reqMsg.MethodBase.IsGenericMethod) {
 137                                 Type[] genericArguments = reqMsg.MethodBase.GetGenericArguments ();
 138                                 method = ((MethodInfo)method).MakeGenericMethod (genericArguments);
 139                         }
 140 #endif
 141
 142                         object oldContext = CallContext.SetCurrentCallContext (reqMsg.LogicalCallContext);
 143
 144                         try
 145                         {
 146                                 object [] out_args;
 147                                 object rval = InternalExecute (method, target, reqMsg.Args, out out_args);
 148
 149                                 // Collect parameters with Out flag from the request message
 150                                 // FIXME: This can be done in the unmanaged side and will be
 151                                 // more efficient
 152
 153                                 ParameterInfo[] parameters = method.GetParameters();
 154                                 object[] returnArgs = new object [parameters.Length];
 155
 156                                 int n = 0;
 157                                 int noa = 0;
 158                                 foreach (ParameterInfo par in parameters)
 159                                 {
 160                                         if (par.IsOut && !par.ParameterType.IsByRef)
 161                                                 returnArgs [n++] = reqMsg.GetArg (par.Position);
 162                                         else if (par.ParameterType.IsByRef)
 163                                                 returnArgs [n++] = out_args [noa++];
 164                                         else
 165                                                 returnArgs [n++] = null;
 166                                 }
 167
 168                                 result = new ReturnMessage (rval, returnArgs, n, CallContext.CreateLogicalCallContext (true), reqMsg);
 169                         }
 170                         catch (Exception e)
 171                         {
 172                                 result = new ReturnMessage (e, reqMsg);
 173                         }
 174
 175                         CallContext.RestoreCallContext (oldContext);
 176                         return result;
 177                 }
 178
 179                 public static IMethodReturnMessage ExecuteMessage (
 180                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 181                 {
 182                         if (IsTransparentProxy(target))
 183                         {
 184                                 // Message must go through all chain of sinks
 185                                 RealProxy rp = GetRealProxy (target);
 186                                 return (IMethodReturnMessage) rp.Invoke (reqMsg);
 187                         }
 188                         else    // Direct call
 189                                 return InternalExecuteMessage (target, reqMsg);
 190                 }
 191
 192 #if NET_2_0
 193                 [System.Runtime.InteropServices.ComVisible (true)]
 194 #endif
 195                 public static object Connect (Type classToProxy, string url)
 196                 {
 197                         ObjRef objRef = new ObjRef (classToProxy, url, null);
 198                         return GetRemoteObject (objRef, classToProxy);
 199                 }
 200
 201 #if NET_2_0
 202                 [System.Runtime.InteropServices.ComVisible (true)]
 203 #endif
 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                         int n = Interlocked.Increment (ref next_id);
 361                         return app_id + Environment.TickCount.ToString("x") + "_" + n + ".rem";
 362                 }
 363
 364 #if NET_2_0
 365                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 366 #endif
 367                 public static RealProxy GetRealProxy (object proxy)
 368                 {
 369                         if (!IsTransparentProxy(proxy)) throw new RemotingException("Cannot get the real proxy from an object that is not a transparent proxy.");
 370                         return (RealProxy)((TransparentProxy)proxy)._rp;
 371                 }
 372
 373                 public static MethodBase GetMethodBaseFromMethodMessage(IMethodMessage msg)
 374                 {
 375                         Type type = Type.GetType (msg.TypeName);
 376                         if (type == null)
 377                                 throw new RemotingException ("Type '" + msg.TypeName + "' not found.");
 378
 379                         return GetMethodBaseFromName (type, msg.MethodName, (Type[]) msg.MethodSignature);
 380                 }
 381
 382                 internal static MethodBase GetMethodBaseFromName (Type type, string methodName, Type[] signature)
 383                 {
 384                         if (type.IsInterface) {
 385                                 return FindInterfaceMethod (type, methodName, signature);
 386                         }
 387                         else {
 388                                 MethodBase method = null;
 389                                 if (signature == null)
 390                                         method = type.GetMethod (methodName, methodBindings);
 391                                 else
 392                                         method = type.GetMethod (methodName, methodBindings, null, (Type[]) signature, null);
 393
 394                                 if (method != null)
 395                                         return method;
 396
 397                                 if (methodName == "FieldSetter")
 398                                         return FieldSetterMethod;
 399
 400                                 if (methodName == "FieldGetter")
 401                                         return FieldGetterMethod;
 402
 403                                 if (signature == null)
 404                                         return type.GetConstructor (methodBindings, null, Type.EmptyTypes, null);
 405                                 else
 406                                         return type.GetConstructor (methodBindings, null, signature, null);
 407                         }
 408                 }
 409
 410                 static MethodBase FindInterfaceMethod (Type type, string methodName, Type[] signature)
 411                 {
 412                         MethodBase method = null;
 413
 414                         if (signature == null)
 415                                 method = type.GetMethod (methodName, methodBindings);
 416                         else
 417                                 method = type.GetMethod (methodName, methodBindings, null, signature, null);
 418
 419                         if (method != null) return method;
 420
 421                         foreach (Type t in type.GetInterfaces ()) {
 422                                 method = FindInterfaceMethod (t, methodName, signature);
 423                                 if (method != null) return method;
 424                         }
 425
 426                         return null;
 427                 }
 428
 429                 public static void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
 430                 {
 431                         if (obj == null) throw new ArgumentNullException ("obj");
 432
 433                         ObjRef oref = Marshal ((MarshalByRefObject)obj);
 434                         oref.GetObjectData (info, context);
 435                 }
 436
 437                 public static ObjRef GetObjRefForProxy(MarshalByRefObject obj)
 438                 {
 439                         Identity ident = GetObjectIdentity(obj);
 440                         if (ident == null) return null;
 441                         else return ident.CreateObjRef(null);
 442                 }
 443
 444                 public static object GetLifetimeService (MarshalByRefObject obj)
 445                 {
 446                         if (obj == null) return null;
 447                         return obj.GetLifetimeService ();
 448                 }
 449
 450                 public static IMessageSink GetEnvoyChainForProxy (MarshalByRefObject obj)
 451                 {
 452                         if (IsTransparentProxy(obj))
 453                                 return ((ClientIdentity)GetRealProxy (obj).ObjectIdentity).EnvoySink;
 454                         else
 455                                 throw new ArgumentException ("obj must be a proxy.","obj");
 456                 }
 457
 458                 [MonoTODO]
 459                 [Conditional ("REMOTING_PERF")]
 460 #if NET_2_0
 461                 [Obsolete ("It existed for only internal use in .NET and unimplemented in mono")]
 462 #endif
 463                 public static void LogRemotingStage (int stage)
 464                 {
 465                         throw new NotImplementedException ();
 466                 }
 467
 468                 public static string GetSessionIdForMethodMessage(IMethodMessage msg)
 469                 {
 470                         // It seems that this it what MS returns.
 471                         return msg.Uri;
 472                 }
 473
 474                 public static bool IsMethodOverloaded(IMethodMessage msg)
 475                 {
 476                         const BindingFlags bfinst = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance;
 477                         MonoType type = (MonoType) msg.MethodBase.DeclaringType;
 478                         return type.GetMethodsByName (msg.MethodName, bfinst, false, type).Length > 1;
 479                 }
 480
 481                 public static bool IsObjectOutOfAppDomain(object tp)
 482                 {
 483                         MarshalByRefObject mbr = tp as MarshalByRefObject;
 484
 485                         if (mbr == null)
 486                                 return false;
 487
 488                         // TODO: use internal call for better performance
 489                         Identity ident = GetObjectIdentity (mbr);
 490                         return ident is ClientIdentity;
 491                 }
 492
 493                 public static bool IsObjectOutOfContext(object tp)
 494                 {
 495                         MarshalByRefObject mbr = tp as MarshalByRefObject;
 496
 497                         if (mbr == null)
 498                                 return false;
 499
 500                         // TODO: use internal call for better performance
 501                         Identity ident = GetObjectIdentity (mbr);
 502                         if (ident == null) return false;
 503
 504                         ServerIdentity sident = ident as ServerIdentity;
 505                         if (sident != null) return sident.Context != System.Threading.Thread.CurrentContext;
 506                         else return true;
 507                 }
 508
 509                 public static bool IsOneWay(MethodBase method)
 510                 {
 511                         return method.IsDefined (typeof (OneWayAttribute), false);
 512                 }
 513
 514                 internal static bool IsAsyncMessage(IMessage msg)
 515                 {
 516                         if (! (msg is MonoMethodMessage)) return false;
 517                         else if (((MonoMethodMessage)msg).IsAsync) return true;
 518                         else if (IsOneWay (((MonoMethodMessage)msg).MethodBase)) return true;
 519                         else return false;
 520                 }
 521
 522                 public static void SetObjectUriForMarshal(MarshalByRefObject obj, string uri)
 523                 {
 524                         if (IsTransparentProxy (obj)) {
 525                                 RealProxy proxy = RemotingServices.GetRealProxy(obj);
 526                                 Identity identity = proxy.ObjectIdentity;
 527
 528                                 if (identity != null && !(identity is ServerIdentity) && !proxy.GetProxiedType().IsContextful)
 529                                         throw new RemotingException ("SetObjectUriForMarshal method should only be called for MarshalByRefObjects that exist in the current AppDomain.");
 530                         }
 531
 532                         Marshal (obj, uri);
 533                 }
 534
 535                 #region Internal Methods
 536
 537                 internal static object CreateClientProxy (ActivatedClientTypeEntry entry, object[] activationAttributes)
 538                 {
 539                         if (entry.ContextAttributes != null || activationAttributes != null)
 540                         {
 541                                 ArrayList props = new ArrayList ();
 542                                 if (entry.ContextAttributes != null) props.AddRange (entry.ContextAttributes);
 543                                 if (activationAttributes != null) props.AddRange (activationAttributes);
 544                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, props.ToArray ());
 545                         }
 546                         else
 547                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, null);
 548                 }
 549
 550                 internal static object CreateClientProxy (Type objectType, string url, object[] activationAttributes)
 551                 {
 552                         string activationUrl = url;
 553                         if (!activationUrl.EndsWith ("/"))
 554                                 activationUrl += "/";
 555                         activationUrl += "RemoteActivationService.rem";
 556
 557                         string objectUri;
 558                         GetClientChannelSinkChain (activationUrl, null, out objectUri);
 559
 560                         RemotingProxy proxy = new RemotingProxy (objectType, activationUrl, activationAttributes);
 561                         return proxy.GetTransparentProxy();
 562                 }
 563
 564                 internal static object CreateClientProxy (WellKnownClientTypeEntry entry)
 565                 {
 566                         return Connect (entry.ObjectType, entry.ObjectUrl, null);
 567                 }
 568
 569                 internal static object CreateClientProxyForContextBound (Type type, object[] activationAttributes)
 570                 {
 571                         if (type.IsContextful)
 572                         {
 573                                 // Look for a ProxyAttribute
 574                                 ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (type, typeof(ProxyAttribute), true);
 575                                 if (att != null)
 576                                         return att.CreateInstance (type);
 577                         }
 578                         RemotingProxy proxy = new RemotingProxy (type, ChannelServices.CrossContextUrl, activationAttributes);
 579                         return proxy.GetTransparentProxy();
 580                 }
 581
 582                 internal static object CreateClientProxyForComInterop (Type type)
 583                 {
 584                         Mono.Interop.ComInteropProxy proxy = new Mono.Interop.ComInteropProxy (type);
 585                         return proxy.GetTransparentProxy ();
 586                 }
 587
 588                 internal static Identity GetIdentityForUri (string uri)
 589                 {
 590                         string normUri = GetNormalizedUri (uri);
 591                         lock (uri_hash)
 592                         {
 593                                 Identity i = (Identity) uri_hash [normUri];
 594
 595                                 if (i == null) {
 596                                         normUri = RemoveAppNameFromUri (uri);
 597                                         if (normUri != null)
 598                                                 i = (Identity) uri_hash [normUri];
 599                                 }
 600
 601                                 return i;
 602                         }
 603                 }
 604
 605                 //
 606                 // If the specified uri starts with the application name,
 607                 // RemoveAppNameFromUri returns the uri w/out the leading
 608                 // application name, otherwise it returns null.
 609                 //
 610                 // Assumes that the uri is not normalized.
 611                 //
 612                 static string RemoveAppNameFromUri (string uri)
 613                 {
 614                         string name = RemotingConfiguration.ApplicationName;
 615                         if (name == null) return null;
 616                         name = "/" + name + "/";
 617                         if (uri.StartsWith (name))
 618                                 return uri.Substring (name.Length);
 619                         else
 620                                 return null;
 621                 }
 622
 623                 internal static Identity GetObjectIdentity (MarshalByRefObject obj)
 624                 {
 625                         if (IsTransparentProxy(obj))
 626                                 return GetRealProxy (obj).ObjectIdentity;
 627                         else
 628                                 return obj.ObjectIdentity;
 629                 }
 630
 631                 internal static ClientIdentity GetOrCreateClientIdentity(ObjRef objRef, Type proxyType, out object clientProxy)
 632                 {
 633                         // This method looks for an identity for the given url.
 634                         // If an identity is not found, it creates the identity and
 635                         // assigns it a proxy to the remote object.
 636
 637                         // Creates the client sink chain for the given url or channelData.
 638                         // It will also get the object uri from the url.
 639
 640                         object channelData = objRef.ChannelInfo != null ? objRef.ChannelInfo.ChannelData : null;
 641
 642                         string objectUri;
 643                         IMessageSink sink = GetClientChannelSinkChain (objRef.URI, channelData, out objectUri);
 644
 645                         if (objectUri == null) objectUri = objRef.URI;
 646
 647                         lock (uri_hash)
 648                         {
 649                                 clientProxy = null;
 650                                 string uri = GetNormalizedUri (objRef.URI);
 651
 652                                 ClientIdentity identity = uri_hash [uri] as ClientIdentity;
 653                                 if (identity != null)
 654                                 {
 655                                         // Object already registered
 656                                         clientProxy = identity.ClientProxy;
 657                                         if (clientProxy != null) return identity;
 658
 659                                         // The proxy has just been GCed, so its identity cannot
 660                                         // be reused. Just dispose it.
 661                                         DisposeIdentity (identity);
 662                                 }
 663
 664                                 // Creates an identity and a proxy for the remote object
 665
 666                                 identity = new ClientIdentity (objectUri, objRef);
 667                                 identity.ChannelSink = sink;
 668
 669                                 // Registers the identity
 670                                 uri_hash [uri] = identity;
 671
 672                                 if (proxyType != null)
 673                                 {
 674                                         RemotingProxy proxy = new RemotingProxy (proxyType, identity);
 675                                         CrossAppDomainSink cds = sink as CrossAppDomainSink;
 676                                         if (cds != null)
 677                                                 proxy.SetTargetDomain (cds.TargetDomainId);
 678
 679                                         clientProxy = proxy.GetTransparentProxy();
 680                                         identity.ClientProxy = (MarshalByRefObject) clientProxy;
 681                                 }
 682
 683                                 return identity;
 684                         }
 685                 }
 686
 687                 static IMessageSink GetClientChannelSinkChain(string url, object channelData, out string objectUri)
 688                 {
 689                         IMessageSink sink = ChannelServices.CreateClientChannelSinkChain (url, channelData, out objectUri);
 690                         if (sink == null)
 691                         {
 692                                 if (url != null)
 693                                 {
 694                                         string msg = String.Format ("Cannot create channel sink to connect to URL {0}. An appropriate channel has probably not been registered.", url);
 695                                         throw new RemotingException (msg);
 696                                 }
 697                                 else
 698                                 {
 699                                         string msg = String.Format ("Cannot create channel sink to connect to the remote object. An appropriate channel has probably not been registered.", url);
 700                                         throw new RemotingException (msg);
 701                                 }
 702                         }
 703                         return sink;
 704                 }
 705
 706                 internal static ClientActivatedIdentity CreateContextBoundObjectIdentity(Type objectType)
 707                 {
 708                         ClientActivatedIdentity identity = new ClientActivatedIdentity (null, objectType);
 709                         identity.ChannelSink = ChannelServices.CrossContextChannel;
 710                         return identity;
 711                 }
 712
 713                 internal static ClientActivatedIdentity CreateClientActivatedServerIdentity(MarshalByRefObject realObject, Type objectType, string objectUri)
 714                 {
 715                         ClientActivatedIdentity identity = new ClientActivatedIdentity (objectUri, objectType);
 716                         identity.AttachServerObject (realObject, Context.DefaultContext);
 717                         RegisterServerIdentity (identity);
 718                         identity.StartTrackingLifetime ((ILease)realObject.InitializeLifetimeService ());
 719                         return identity;
 720                 }
 721
 722                 internal static ServerIdentity CreateWellKnownServerIdentity(Type objectType, string objectUri, WellKnownObjectMode mode)
 723                 {
 724                         ServerIdentity identity;
 725
 726                         if (mode == WellKnownObjectMode.SingleCall)
 727                                 identity = new  SingleCallIdentity(objectUri, Context.DefaultContext, objectType);
 728                         else
 729                                 identity = new  SingletonIdentity(objectUri, Context.DefaultContext, objectType);
 730
 731                         RegisterServerIdentity (identity);
 732                         return identity;
 733                 }
 734
 735                 private static void RegisterServerIdentity(ServerIdentity identity)
 736                 {
 737                         lock (uri_hash)
 738                         {
 739                                 if (uri_hash.ContainsKey (identity.ObjectUri))
 740                                         throw new RemotingException ("Uri already in use: " + identity.ObjectUri + ".");
 741
 742                                 uri_hash[identity.ObjectUri] = identity;
 743                         }
 744                 }
 745
 746                 internal static object GetProxyForRemoteObject (ObjRef objref, Type classToProxy)
 747                 {
 748                         ClientActivatedIdentity identity = GetIdentityForUri (objref.URI) as ClientActivatedIdentity;
 749                         if (identity != null) return identity.GetServerObject ();
 750                         else return GetRemoteObject (objref, classToProxy);
 751                 }
 752
 753                 internal static object GetRemoteObject(ObjRef objRef, Type proxyType)
 754                 {
 755                         object proxy;
 756                         GetOrCreateClientIdentity (objRef, proxyType, out proxy);
 757                         return proxy;
 758                 }
 759
 760                 // This method is called by the runtime
 761                 internal static object GetServerObject (string uri)
 762                 {
 763                         ClientActivatedIdentity identity = GetIdentityForUri (uri) as ClientActivatedIdentity;
 764                         if (identity == null) throw new RemotingException ("Server for uri '" + uri + "' not found");
 765                         return identity.GetServerObject ();
 766                 }
 767
 768                 // This method is called by the runtime
 769                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 770                 internal static byte[] SerializeCallData (object obj)
 771                 {
 772                         LogicalCallContext ctx = CallContext.CreateLogicalCallContext (false);
 773                         if (ctx != null) {
 774                                 CACD cad = new CACD ();
 775                                 cad.d = obj;
 776                                 cad.c = ctx;
 777                                 obj = cad;
 778                         }
 779
 780                         if (obj == null) return null;
 781                         MemoryStream ms = new MemoryStream ();
 782                         _serializationFormatter.Serialize (ms, obj);
 783                         return ms.ToArray ();
 784                 }
 785
 786                 // This method is called by the runtime
 787                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 788                 internal static object DeserializeCallData (byte[] array)
 789                 {
 790                         if (array == null) return null;
 791
 792                         MemoryStream ms = new MemoryStream (array);
 793                         object obj = _deserializationFormatter.Deserialize (ms);
 794
 795                         if (obj is CACD) {
 796                                 CACD cad = (CACD) obj;
 797                                 obj = cad.d;
 798                                 CallContext.UpdateCurrentCallContext ((LogicalCallContext) cad.c);
 799                         }
 800                         return obj;
 801                 }
 802
 803                 // This method is called by the runtime
 804                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 805                 internal static byte[] SerializeExceptionData (Exception ex)
 806                 {
 807                         try {
 808                                 int retry = 4;
 809
 810                                 do {
 811                                         try {
 812                                                 MemoryStream ms = new MemoryStream ();
 813                                                 _serializationFormatter.Serialize (ms, ex);
 814                                                 return ms.ToArray ();
 815                                         }
 816                                         catch (Exception e) {
 817                                                 if (e is ThreadAbortException) {
 818                                                         Thread.ResetAbort ();
 819                                                         retry = 5;
 820                                                         ex = e;
 821                                                 }
 822                                                 else if (retry == 2) {
 823                                                         ex = new Exception ();
 824                                                         ex.SetMessage (e.Message);
 825                                                         ex.SetStackTrace (e.StackTrace);
 826                                                 }
 827                                                 else
 828                                                         ex = e;
 829                                         }
 830                                         retry--;
 831                                 }
 832                                 while (retry > 0);
 833
 834                                 return null;
 835                         }
 836                         catch (Exception tex)
 837                         {
 838                                 byte[] data = SerializeExceptionData (tex);
 839                                 Thread.ResetAbort ();
 840                                 return data;
 841                         }
 842                 }
 843
 844                 internal static object GetDomainProxy(AppDomain domain)
 845                 {
 846                         byte[] data = null;
 847
 848                         Context currentContext = Thread.CurrentContext;
 849
 850                         try
 851                         {
 852                                 data = (byte[])AppDomain.InvokeInDomain (domain, typeof (AppDomain).GetMethod ("GetMarshalledDomainObjRef", BindingFlags.Instance|BindingFlags.NonPublic), domain, null);
 853                         }
 854                         finally
 855                         {
 856                                 AppDomain.InternalSetContext (currentContext);
 857                         }
 858
 859                         byte[] data_copy = new byte [data.Length];
 860                         data.CopyTo (data_copy, 0);
 861                         MemoryStream stream = new MemoryStream (data_copy);
 862                         ObjRef appref = (ObjRef) CADSerializer.DeserializeObject (stream);
 863                         return (AppDomain) RemotingServices.Unmarshal(appref);
 864                 }
 865
 866                 private static void RegisterInternalChannels()
 867                 {
 868                         CrossAppDomainChannel.RegisterCrossAppDomainChannel();
 869                 }
 870
 871                 internal static void DisposeIdentity (Identity ident)
 872                 {
 873                         lock (uri_hash)
 874                         {
 875                                 if (!ident.Disposed) {
 876                                         ClientIdentity clientId = ident as ClientIdentity;
 877                                         if (clientId != null)
 878                                                 uri_hash.Remove (GetNormalizedUri (clientId.TargetUri));
 879                                         else
 880                                                 uri_hash.Remove (ident.ObjectUri);
 881
 882                                         ident.Disposed = true;
 883                                 }
 884                         }
 885                 }
 886
 887                 internal static Identity GetMessageTargetIdentity (IMessage msg)
 888                 {
 889                         // Returns the identity where the message is sent
 890
 891                         if (msg is IInternalMessage)
 892                                 return ((IInternalMessage)msg).TargetIdentity;
 893
 894                         lock (uri_hash)
 895                         {
 896                                 string uri = GetNormalizedUri (((IMethodMessage)msg).Uri);
 897                                 return uri_hash [uri] as ServerIdentity;
 898                         }
 899                 }
 900
 901                 internal static void SetMessageTargetIdentity (IMessage msg, Identity ident)
 902                 {
 903                         if (msg is IInternalMessage)
 904                                 ((IInternalMessage)msg).TargetIdentity = ident;
 905                 }
 906
 907                 internal static bool UpdateOutArgObject (ParameterInfo pi, object local, object remote)
 908                 {
 909                         if (pi.ParameterType.IsArray && ((Array)local).Rank == 1)
 910                         {
 911                                 Array alocal = (Array) local;
 912                                 if (alocal.Rank == 1)
 913                                 {
 914                                         Array.Copy ((Array) remote, alocal, alocal.Length);
 915                                         return true;
 916                                 }
 917                                 else
 918                                 {
 919                                         // TODO
 920                                 }
 921                         }
 922                         return false;
 923                 }
 924
 925                 static string GetNormalizedUri (string uri)
 926                 {
 927                         if (uri.StartsWith ("/")) return uri.Substring (1);
 928                         else return uri;
 929                 }
 930
 931                 #endregion
 932         }
 933 }