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 //
  11
  12 //
  13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System;
  36 using System.Diagnostics;
  37 using System.Text;
  38 using System.Reflection;
  39 using System.Threading;
  40 using System.Collections;
  41 using System.Runtime.Remoting.Messaging;
  42 using System.Runtime.Remoting.Proxies;
  43 using System.Runtime.Remoting.Channels;
  44 using System.Runtime.Remoting.Contexts;
  45 using System.Runtime.Remoting.Activation;
  46 using System.Runtime.Remoting.Lifetime;
  47 using System.Runtime.CompilerServices;
  48 using System.Runtime.Serialization;
  49 using System.IO;
  50
  51 namespace System.Runtime.Remoting
  52 {
  53         public sealed class RemotingServices
  54         {
  55                 // Holds the identities of the objects, using uri as index
  56                 static Hashtable uri_hash = new Hashtable ();
  57
  58                 internal static string app_id;
  59                 static int next_id = 1;
  60
  61                 static RemotingServices ()
  62                 {
  63                         RegisterInternalChannels ();
  64                         app_id = Guid.NewGuid().ToString().Replace('-', '_') + "/";
  65                         CreateWellKnownServerIdentity (typeof(RemoteActivator), "RemoteActivationService.rem", WellKnownObjectMode.Singleton);
  66                 }
  67
  68                 private RemotingServices () {}
  69
  70                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  71                 internal extern static object InternalExecute (MonoMethod method, Object obj,
  72                                                                Object[] parameters, out object [] out_args);
  73
  74                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  75                 public extern static bool IsTransparentProxy (object proxy);
  76
  77                 internal static IMethodReturnMessage InternalExecuteMessage (
  78                         MarshalByRefObject target, IMethodCallMessage reqMsg)
  79                 {
  80                         ReturnMessage result;
  81
  82                         MonoMethod method = (MonoMethod) target.GetType().GetMethod(reqMsg.MethodName, BindingFlags.Public|BindingFlags.NonPublic|BindingFlags.Instance, null, (Type[]) reqMsg.MethodSignature, null);
  83                         object oldContext = CallContext.SetCurrentCallContext (reqMsg.LogicalCallContext);
  84
  85                         try
  86                         {
  87                                 object [] out_args;
  88                                 object rval = InternalExecute (method, target, reqMsg.Args, out out_args);
  89
  90                                 // Collect parameters with Out flag from the request message
  91                                 // FIXME: This can be done in the unmanaged side and will be
  92                                 // more efficient
  93
  94                                 ParameterInfo[] parameters = method.GetParameters();
  95                                 object[] returnArgs = new object [parameters.Length];
  96
  97                                 int n = 0;
  98                                 int noa = 0;
  99                                 foreach (ParameterInfo par in parameters)
 100                                 {
 101                                         if (par.IsOut && !par.ParameterType.IsByRef)
 102                                                 returnArgs [n++] = reqMsg.GetArg (par.Position);
 103                                         else if (par.ParameterType.IsByRef)
 104                                                 returnArgs [n++] = out_args [noa++];
 105                                         else
 106                                                 returnArgs [n++] = null;
 107                                 }
 108
 109                                 result = new ReturnMessage (rval, returnArgs, n, CallContext.CreateLogicalCallContext(), reqMsg);
 110                         }
 111                         catch (Exception e)
 112                         {
 113                                 result = new ReturnMessage (e, reqMsg);
 114                         }
 115
 116                         CallContext.RestoreCallContext (oldContext);
 117                         return result;
 118                 }
 119
 120                 public static IMethodReturnMessage ExecuteMessage (
 121                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 122                 {
 123                         if (IsTransparentProxy(target))
 124                         {
 125                                 // Message must go through all chain of sinks
 126                                 RealProxy rp = GetRealProxy (target);
 127                                 return (IMethodReturnMessage) rp.Invoke (reqMsg);
 128                         }
 129                         else    // Direct call
 130                                 return InternalExecuteMessage (target, reqMsg);
 131                 }
 132
 133                 public static object Connect (Type classToProxy, string url)
 134                 {
 135                         ObjRef objRef = new ObjRef (classToProxy, url, null);
 136                         return GetRemoteObject (objRef, classToProxy);
 137                 }
 138
 139                 public static object Connect (Type classToProxy, string url, object data)
 140                 {
 141                         ObjRef objRef = new ObjRef (classToProxy, url, data);
 142                         return GetRemoteObject (objRef, classToProxy);
 143                 }
 144
 145                 public static bool Disconnect (MarshalByRefObject obj)
 146                 {
 147                         if (obj == null) throw new ArgumentNullException ("obj");
 148
 149                         ServerIdentity identity;
 150
 151                         if (IsTransparentProxy (obj))
 152                         {
 153                                 // CBOs are always accessed through a proxy, even in the server, so
 154                                 // for server CBOs it is ok to disconnect a proxy
 155
 156                                 RealProxy proxy = GetRealProxy(obj);
 157                                 if (proxy.GetProxiedType().IsContextful && (proxy.ObjectIdentity is ServerIdentity))
 158                                         identity = proxy.ObjectIdentity as ServerIdentity;
 159                                 else
 160                                         throw new ArgumentException ("The obj parameter is a proxy.");
 161                         }
 162                         else {
 163                                 identity = obj.ObjectIdentity;
 164                                 obj.ObjectIdentity = null;
 165                         }
 166
 167                         if (identity == null || !identity.IsConnected)
 168                                 return false;
 169                         else
 170                         {
 171                                 LifetimeServices.StopTrackingLifetime (identity);
 172                                 DisposeIdentity (identity);
 173                                 return true;
 174                         }
 175                 }
 176
 177                 public static Type GetServerTypeForUri (string uri)
 178                 {
 179                         ServerIdentity ident = GetIdentityForUri (uri) as ServerIdentity;
 180                         if (ident == null) return null;
 181                         return ident.ObjectType;
 182                 }
 183
 184                 public static string GetObjectUri (MarshalByRefObject obj)
 185                 {
 186                         Identity ident = GetObjectIdentity(obj);
 187                         if (ident is ClientIdentity) return ((ClientIdentity)ident).TargetUri;
 188                         else if (ident != null) return ident.ObjectUri;
 189                         else return null;
 190                 }
 191
 192                 public static object Unmarshal (ObjRef objref)
 193                 {
 194                         return Unmarshal(objref, true);
 195                 }
 196
 197                 public static object Unmarshal (ObjRef objref, bool fRefine)
 198                 {
 199                         Type classToProxy = fRefine ? objref.ServerType : typeof (MarshalByRefObject);
 200                         if (classToProxy == null) classToProxy = typeof (MarshalByRefObject);
 201
 202                         if (objref.IsReferenceToWellKnow)
 203                                 return GetRemoteObject(objref, classToProxy);
 204                         else
 205                         {
 206                                 if (classToProxy.IsContextful)
 207                                 {
 208                                         // Look for a ProxyAttribute
 209                                         ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (classToProxy, typeof(ProxyAttribute),true);
 210                                         if (att != null)
 211                                                 return att.CreateProxy (objref, classToProxy, null, null).GetTransparentProxy();
 212                                 }
 213                                 return GetProxyForRemoteObject (objref, classToProxy);
 214                         }
 215                 }
 216
 217                 public static ObjRef Marshal (MarshalByRefObject obj)
 218                 {
 219                         return Marshal (obj, null, null);
 220                 }
 221
 222                 public static ObjRef Marshal (MarshalByRefObject obj, string uri)
 223                 {
 224                         return Marshal (obj, uri, null);
 225                 }
 226
 227                 public static ObjRef Marshal (MarshalByRefObject obj, string uri, Type requested_type)
 228                 {
 229                         if (IsTransparentProxy (obj))
 230                         {
 231                                 RealProxy proxy = RemotingServices.GetRealProxy(obj);
 232                                 Identity identity = proxy.ObjectIdentity;
 233
 234                                 if (identity != null)
 235                                 {
 236                                         if (proxy.GetProxiedType().IsContextful && !identity.IsConnected)
 237                                         {
 238                                                 // Unregistered local contextbound object. Register now.
 239                                                 ClientActivatedIdentity cboundIdentity = (ClientActivatedIdentity)identity;
 240                                                 if (uri == null) uri = NewUri();
 241                                                 cboundIdentity.ObjectUri = uri;
 242                                                 RegisterServerIdentity (cboundIdentity);
 243                                                 cboundIdentity.StartTrackingLifetime ((ILease)obj.InitializeLifetimeService());
 244                                                 return cboundIdentity.CreateObjRef(requested_type);
 245                                         }
 246                                         else if (uri != null)
 247                                                 throw new RemotingException ("It is not possible marshal a proxy of a remote object.");
 248
 249                                         return proxy.ObjectIdentity.CreateObjRef(requested_type);
 250                                 }
 251                         }
 252
 253                         if (requested_type == null) requested_type = obj.GetType();
 254
 255                         if (uri == null)
 256                         {
 257                                 if (obj.ObjectIdentity == null)
 258                                 {
 259                                         uri = NewUri();
 260                                         CreateClientActivatedServerIdentity (obj, requested_type, uri);
 261                                 }
 262                         }
 263                         else
 264                         {
 265                                 ClientActivatedIdentity identity = GetIdentityForUri ("/" + uri) as ClientActivatedIdentity;
 266                                 if (identity == null || obj != identity.GetServerObject())
 267                                         CreateClientActivatedServerIdentity (obj, requested_type, uri);
 268                         }
 269
 270                         if (IsTransparentProxy (obj))
 271                                 return RemotingServices.GetRealProxy(obj).ObjectIdentity.CreateObjRef (requested_type);
 272                         else
 273                                 return obj.CreateObjRef(requested_type);
 274                 }
 275
 276                 static string NewUri ()
 277                 {
 278                         int n = Interlocked.Increment (ref next_id);
 279                         return app_id + Environment.TickCount + "_" + n + ".rem";
 280                 }
 281
 282                 public static RealProxy GetRealProxy (object proxy)
 283                 {
 284                         if (!IsTransparentProxy(proxy)) throw new RemotingException("Cannot get the real proxy from an object that is not a transparent proxy.");
 285                         return (RealProxy)((TransparentProxy)proxy)._rp;
 286                 }
 287
 288                 public static MethodBase GetMethodBaseFromMethodMessage(IMethodMessage msg)
 289                 {
 290                         Type type = Type.GetType (msg.TypeName);
 291                         if (type == null)
 292                                 throw new RemotingException ("Type '" + msg.TypeName + "' not found.");
 293
 294                         BindingFlags bflags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
 295
 296                         MethodBase method;
 297                         if (msg.MethodSignature == null)
 298                                 method = type.GetMethod (msg.MethodName, bflags);
 299                         else
 300                                 method = type.GetMethod (msg.MethodName, bflags, null, (Type[]) msg.MethodSignature, null);
 301
 302                         if (method != null)
 303                                 return method;
 304
 305                         if (msg.MethodSignature == null)
 306                                 return type.GetConstructor (bflags, null, Type.EmptyTypes, null);
 307                         else
 308                                 return type.GetConstructor (bflags, null, (Type[]) msg.MethodSignature, null);
 309                 }
 310
 311                 public static void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
 312                 {
 313                         if (obj == null) throw new ArgumentNullException ("obj");
 314
 315                         ObjRef oref = Marshal ((MarshalByRefObject)obj);
 316                         oref.GetObjectData (info, context);
 317                 }
 318
 319                 public static ObjRef GetObjRefForProxy(MarshalByRefObject obj)
 320                 {
 321                         Identity ident = GetObjectIdentity(obj);
 322                         if (ident == null) return null;
 323                         else return ident.CreateObjRef(null);
 324                 }
 325
 326                 public static object GetLifetimeService (MarshalByRefObject obj)
 327                 {
 328                         if (obj == null) return null;
 329                         return obj.GetLifetimeService ();
 330                 }
 331
 332                 public static IMessageSink GetEnvoyChainForProxy (MarshalByRefObject obj)
 333                 {
 334                         if (IsTransparentProxy(obj))
 335                                 return ((ClientIdentity)GetRealProxy (obj).ObjectIdentity).EnvoySink;
 336                         else
 337                                 throw new ArgumentException ("obj must be a proxy.","obj");
 338                 }
 339
 340                 [MonoTODO]
 341                 [Conditional ("REMOTING_PERF")]
 342                 public static void LogRemotingStage (int stage)
 343                 {
 344                         throw new NotImplementedException ();
 345                 }
 346
 347                 public static string GetSessionIdForMethodMessage(IMethodMessage msg)
 348                 {
 349                         // It seems that this it what MS returns.
 350                         return msg.Uri;
 351                 }
 352
 353                 public static bool IsMethodOverloaded(IMethodMessage msg)
 354                 {
 355                         // TODO: use internal call for better performance
 356                         Type type = msg.MethodBase.DeclaringType;
 357                         MemberInfo[] members = type.GetMember (msg.MethodName, MemberTypes.Method, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
 358                         return members.Length > 1;
 359                 }
 360
 361                 public static bool IsObjectOutOfAppDomain(object tp)
 362                 {
 363                         // TODO: use internal call for better performance
 364                         Identity ident = GetObjectIdentity((MarshalByRefObject)tp);
 365                         if (ident != null) return !ident.IsFromThisAppDomain;
 366                         else return false;
 367                 }
 368
 369                 public static bool IsObjectOutOfContext(object tp)
 370                 {
 371                         // TODO: use internal call for better performance
 372                         ServerIdentity ident = GetObjectIdentity((MarshalByRefObject)tp) as ServerIdentity;
 373                         if (ident != null) return ident.Context != System.Threading.Thread.CurrentContext;
 374                         else return false;
 375                 }
 376
 377                 public static bool IsOneWay(MethodBase method)
 378                 {
 379                         // TODO: use internal call for better performance
 380                         object[] atts = method.GetCustomAttributes (typeof (OneWayAttribute), false);
 381                         return atts.Length > 0;
 382                 }
 383
 384                 internal static bool IsAsyncMessage(IMessage msg)
 385                 {
 386                         if (! (msg is MonoMethodMessage)) return false;
 387                         else if (((MonoMethodMessage)msg).IsAsync) return true;
 388                         else if (IsOneWay (((MonoMethodMessage)msg).MethodBase)) return true;
 389                         else return false;
 390                 }
 391
 392                 public static void SetObjectUriForMarshal(MarshalByRefObject obj, string uri)
 393                 {
 394                         if (IsTransparentProxy (obj)) throw new RemotingException ("SetObjectUriForMarshal method should only be called for MarshalByRefObjects that exist in the current AppDomain.");
 395                         Marshal (obj, uri);
 396                 }
 397
 398                 #region Internal Methods
 399
 400                 internal static object CreateClientProxy (ActivatedClientTypeEntry entry, object[] activationAttributes)
 401                 {
 402                         if (entry.ContextAttributes != null || activationAttributes != null)
 403                         {
 404                                 ArrayList props = new ArrayList ();
 405                                 if (entry.ContextAttributes != null) props.AddRange (entry.ContextAttributes);
 406                                 if (activationAttributes != null) props.AddRange (activationAttributes);
 407                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, props.ToArray ());
 408                         }
 409                         else
 410                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, null);
 411                 }
 412
 413                 internal static object CreateClientProxy (Type objectType, string url, object[] activationAttributes)
 414                 {
 415                         string activationUrl = url + "/RemoteActivationService.rem";
 416
 417                         string objectUri;
 418                         IMessageSink sink = GetClientChannelSinkChain (activationUrl, null, out objectUri);
 419
 420                         RemotingProxy proxy = new RemotingProxy (objectType, activationUrl, activationAttributes);
 421                         return proxy.GetTransparentProxy();
 422                 }
 423
 424                 internal static object CreateClientProxy (WellKnownClientTypeEntry entry)
 425                 {
 426                         return Connect (entry.ObjectType, entry.ObjectUrl, null);
 427                 }
 428
 429                 internal static object CreateClientProxyForContextBound (Type type, object[] activationAttributes)
 430                 {
 431                         if (type.IsContextful)
 432                         {
 433                                 // Look for a ProxyAttribute
 434                                 ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (type, typeof(ProxyAttribute), true);
 435                                 if (att != null)
 436                                         return att.CreateInstance (type);
 437                         }
 438                         RemotingProxy proxy = new RemotingProxy (type, ChannelServices.CrossContextUrl, activationAttributes);
 439                         return proxy.GetTransparentProxy();
 440                 }
 441
 442                 internal static Identity GetIdentityForUri (string uri)
 443                 {
 444                         lock (uri_hash)
 445                         {
 446                                 return (Identity)uri_hash [GetNormalizedUri(uri)];
 447                         }
 448                 }
 449
 450                 internal static Identity GetObjectIdentity (MarshalByRefObject obj)
 451                 {
 452                         if (IsTransparentProxy(obj))
 453                                 return GetRealProxy (obj).ObjectIdentity;
 454                         else
 455                                 return obj.ObjectIdentity;
 456                 }
 457
 458                 internal static ClientIdentity GetOrCreateClientIdentity(ObjRef objRef, Type proxyType, out object clientProxy)
 459                 {
 460                         // This method looks for an identity for the given url.
 461                         // If an identity is not found, it creates the identity and
 462                         // assigns it a proxy to the remote object.
 463
 464                         // Creates the client sink chain for the given url or channelData.
 465                         // It will also get the object uri from the url.
 466
 467                         object channelData = objRef.ChannelInfo != null ? objRef.ChannelInfo.ChannelData : null;
 468                         string url = (channelData == null) ? objRef.URI : null;
 469
 470                         string objectUri;
 471                         IMessageSink sink = GetClientChannelSinkChain (url, channelData, out objectUri);
 472
 473                         if (objectUri == null) objectUri = objRef.URI;
 474
 475                         lock (uri_hash)
 476                         {
 477                                 clientProxy = null;
 478                                 string uri = GetNormalizedUri (objRef.URI);
 479
 480                                 ClientIdentity identity = uri_hash [uri] as ClientIdentity;
 481                                 if (identity != null)
 482                                 {
 483                                         // Object already registered
 484                                         clientProxy = identity.ClientProxy;
 485                                         if (clientProxy != null) return identity;
 486
 487                                         // The proxy has just been GCed, so its identity cannot
 488                                         // be reused. Just dispose it.
 489                                         DisposeIdentity (identity);
 490                                 }
 491
 492                                 // Creates an identity and a proxy for the remote object
 493
 494                                 identity = new ClientIdentity (objectUri, objRef);
 495                                 identity.ChannelSink = sink;
 496
 497                                 // Registers the identity
 498                                 uri_hash [uri] = identity;
 499
 500                                 if (proxyType != null)
 501                                 {
 502                                         RemotingProxy proxy = new RemotingProxy (proxyType, identity);
 503                                         clientProxy = proxy.GetTransparentProxy();
 504                                         identity.ClientProxy = (MarshalByRefObject) clientProxy;
 505                                 }
 506
 507                                 return identity;
 508                         }
 509                 }
 510
 511                 static IMessageSink GetClientChannelSinkChain(string url, object channelData, out string objectUri)
 512                 {
 513                         IMessageSink sink = ChannelServices.CreateClientChannelSinkChain (url, channelData, out objectUri);
 514                         if (sink == null)
 515                         {
 516                                 if (url != null)
 517                                 {
 518                                         string msg = String.Format ("Cannot create channel sink to connect to URL {0}. An appropriate channel has probably not been registered.", url);
 519                                         throw new RemotingException (msg);
 520                                 }
 521                                 else
 522                                 {
 523                                         string msg = String.Format ("Cannot create channel sink to connect to the remote object. An appropriate channel has probably not been registered.", url);
 524                                         throw new RemotingException (msg);
 525                                 }
 526                         }
 527                         return sink;
 528                 }
 529
 530                 internal static ClientActivatedIdentity CreateContextBoundObjectIdentity(Type objectType)
 531                 {
 532                         ClientActivatedIdentity identity = new ClientActivatedIdentity (null, objectType);
 533                         identity.ChannelSink = ChannelServices.CrossContextChannel;
 534                         return identity;
 535                 }
 536
 537                 internal static ClientActivatedIdentity CreateClientActivatedServerIdentity(MarshalByRefObject realObject, Type objectType, string objectUri)
 538                 {
 539                         ClientActivatedIdentity identity = new ClientActivatedIdentity (objectUri, objectType);
 540                         identity.AttachServerObject (realObject, Context.DefaultContext);
 541                         RegisterServerIdentity (identity);
 542                         identity.StartTrackingLifetime ((ILease)realObject.InitializeLifetimeService ());
 543                         return identity;
 544                 }
 545
 546                 internal static ServerIdentity CreateWellKnownServerIdentity(Type objectType, string objectUri, WellKnownObjectMode mode)
 547                 {
 548                         ServerIdentity identity;
 549
 550                         if (mode == WellKnownObjectMode.SingleCall)
 551                                 identity = new  SingleCallIdentity(objectUri, Context.DefaultContext, objectType);
 552                         else
 553                                 identity = new  SingletonIdentity(objectUri, Context.DefaultContext, objectType);
 554
 555                         RegisterServerIdentity (identity);
 556                         return identity;
 557                 }
 558
 559                 private static void RegisterServerIdentity(ServerIdentity identity)
 560                 {
 561                         lock (uri_hash)
 562                         {
 563                                 if (uri_hash.ContainsKey (identity.ObjectUri))
 564                                         throw new RemotingException ("Uri already in use: " + identity.ObjectUri + ".");
 565
 566                                 uri_hash[identity.ObjectUri] = identity;
 567                         }
 568                 }
 569
 570                 internal static object GetProxyForRemoteObject (ObjRef objref, Type classToProxy)
 571                 {
 572                         ClientActivatedIdentity identity = GetIdentityForUri (objref.URI) as ClientActivatedIdentity;
 573                         if (identity != null) return identity.GetServerObject ();
 574                         else return GetRemoteObject (objref, classToProxy);
 575                 }
 576
 577                 internal static object GetRemoteObject(ObjRef objRef, Type proxyType)
 578                 {
 579                         object proxy;
 580                         GetOrCreateClientIdentity (objRef, proxyType, out proxy);
 581                         return proxy;
 582                 }
 583
 584                 internal static object GetDomainProxy(AppDomain domain)
 585                 {
 586                         byte[] data = null;
 587
 588                         Context currentContext = Thread.CurrentContext;
 589
 590                         try
 591                         {
 592                                 data = (byte[])AppDomain.InvokeInDomain (domain, typeof (AppDomain).GetMethod ("GetMarshalledDomainObjRef", BindingFlags.Instance|BindingFlags.NonPublic), domain, null);
 593                         }
 594                         finally
 595                         {
 596                                 AppDomain.InternalSetContext (currentContext);
 597                         }
 598
 599                         MemoryStream stream = new MemoryStream (data);
 600                         ObjRef appref = (ObjRef) CADSerializer.DeserializeObject (stream);
 601                         return (AppDomain) RemotingServices.Unmarshal(appref);
 602                 }
 603
 604                 private static void RegisterInternalChannels()
 605                 {
 606                         CrossAppDomainChannel.RegisterCrossAppDomainChannel();
 607                 }
 608
 609                 internal static void DisposeIdentity (Identity ident)
 610                 {
 611                         lock (uri_hash)
 612                         {
 613                                 if (!ident.Disposed) {
 614                                         ClientIdentity clientId = ident as ClientIdentity;
 615                                         if (clientId != null)
 616                                                 uri_hash.Remove (GetNormalizedUri (clientId.TargetUri));
 617                                         else
 618                                                 uri_hash.Remove (ident.ObjectUri);
 619
 620                                         ident.Disposed = true;
 621                                 }
 622                         }
 623                 }
 624
 625                 internal static Identity GetMessageTargetIdentity (IMessage msg)
 626                 {
 627                         // Returns the identity where the message is sent
 628
 629                         if (msg is IInternalMessage)
 630                                 return ((IInternalMessage)msg).TargetIdentity;
 631
 632                         lock (uri_hash)
 633                         {
 634                                 string uri = GetNormalizedUri (((IMethodMessage)msg).Uri);
 635                                 return uri_hash [uri] as ServerIdentity;
 636                         }
 637                 }
 638
 639                 internal static void SetMessageTargetIdentity (IMessage msg, Identity ident)
 640                 {
 641                         if (msg is IInternalMessage)
 642                                 ((IInternalMessage)msg).TargetIdentity = ident;
 643                 }
 644
 645                 internal static bool UpdateOutArgObject (ParameterInfo pi, object local, object remote)
 646                 {
 647                         if (local is StringBuilder)
 648                         {
 649                                 StringBuilder sb = local as StringBuilder;
 650                                 sb.Remove (0, sb.Length);
 651                                 sb.Append (remote.ToString());
 652                                 return true;
 653                         }
 654                         else if (pi.ParameterType.IsArray && ((Array)local).Rank == 1)
 655                         {
 656                                 Array alocal = (Array) local;
 657                                 if (alocal.Rank == 1)
 658                                 {
 659                                         Array.Copy ((Array) remote, alocal, alocal.Length);
 660                                         return true;
 661                                 }
 662                                 else
 663                                 {
 664                                         // TODO
 665                                 }
 666                         }
 667                         return false;
 668                 }
 669
 670                 static string GetNormalizedUri (string uri)
 671                 {
 672                         if (uri.StartsWith ("/")) return uri.Substring (1);
 673                         else return uri;
 674                 }
 675
 676                 #endregion
 677         }
 678 }