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