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