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