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