mcs/class/corlib/System.Runtime.Remoting/ObjRef.cs

   1 //
   2 // System.Runtime.Remoting.ObjRef.cs
   3 //
   4 // Author:
   5 //   Miguel de Icaza (miguel@ximian.com)
   6 //   Dietmar Maurer (dietmar@ximian.com)
   7 //   Lluis Sanchez Gual (lluis@ideary.com)
   8 //   Patrik Torstensson
   9 //
  10 // (C) Ximian, Inc.  http://www.ximian.com
  11 //
  12
  13 //
  14 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System;
  37 using System.IO;
  38 using System.Runtime.Serialization;
  39 using System.Runtime.Remoting.Channels;
  40 using System.Runtime.Remoting.Messaging;
  41 using System.Runtime.Remoting.Proxies;
  42
  43 using System.Runtime.ConstrainedExecution;
  44
  45 namespace System.Runtime.Remoting {
  46
  47         [Serializable]
  48         [System.Runtime.InteropServices.ComVisible (true)]
  49         public class ObjRef : IObjectReference, ISerializable
  50         {
  51                 IChannelInfo channel_info;
  52                 string uri;
  53                 IRemotingTypeInfo typeInfo;
  54                 IEnvoyInfo envoyInfo;
  55                 int flags;
  56                 Type _serverType;
  57
  58                 static int MarshalledObjectRef = 1;
  59                 static int WellKnowObjectRef = 2;
  60
  61                 public ObjRef ()
  62                 {
  63                         // no idea why this needs to be public
  64
  65                         UpdateChannelInfo();
  66                 }
  67
  68                 internal ObjRef (string uri, IChannelInfo cinfo)
  69                 {
  70                         this.uri = uri;
  71                         this.channel_info = cinfo;
  72                 }
  73
  74                 internal ObjRef DeserializeInTheCurrentDomain (int domainId, byte[] tInfo)
  75                 {
  76                                 string local_uri = string.Copy (this.uri);
  77                                 ChannelInfo cinfo = new ChannelInfo (new CrossAppDomainData (domainId));
  78                                 ObjRef res = new ObjRef (local_uri, cinfo);
  79                                 IRemotingTypeInfo typeInfo = (IRemotingTypeInfo)CADSerializer.DeserializeObjectSafe (tInfo);
  80                                 res.typeInfo = typeInfo;
  81                                 return res;
  82                 }
  83
  84                 internal byte[] SerializeType ()
  85                 {
  86                         // FIXME: Assert self and typeinfo in same domain
  87                         if (typeInfo == null)
  88                                 throw new Exception ("Attempt to serialize a null TypeInfo.");
  89
  90                         MemoryStream stm = CADSerializer.SerializeObject (typeInfo);
  91                         return stm.GetBuffer ();
  92                 }
  93
  94                 internal ObjRef (ObjRef o, bool unmarshalAsProxy)
  95                 {
  96                         channel_info = o.channel_info;
  97                         uri = o.uri;
  98
  99                         typeInfo = o.typeInfo;
 100                         envoyInfo = o.envoyInfo;
 101                         flags = o.flags;
 102                         if (unmarshalAsProxy) flags |= MarshalledObjectRef;
 103                 }
 104
 105                 public ObjRef (MarshalByRefObject o, Type requestedType)
 106                 {
 107                         if (o == null)
 108                                 throw new ArgumentNullException ("o");
 109
 110                         if (requestedType == null)
 111                                 throw new ArgumentNullException ("requestedType");
 112
 113                         // The ObjRef can only be constructed if the given o
 114                         // has already been marshalled using RemotingServices.Marshall
 115
 116                         uri = RemotingServices.GetObjectUri (o);
 117                         typeInfo = new TypeInfo (requestedType);
 118
 119                         if (!requestedType.IsInstanceOfType (o))
 120                                 throw new RemotingException ("The server object type cannot be cast to the requested type " + requestedType.FullName);
 121
 122                         UpdateChannelInfo();
 123                 }
 124
 125                 internal ObjRef (Type type, string url, object remoteChannelData)
 126                 {
 127                         uri = url;
 128                         typeInfo = new TypeInfo(type);
 129
 130                         if (remoteChannelData != null)
 131                                 channel_info = new ChannelInfo (remoteChannelData);
 132
 133                         flags |= WellKnowObjectRef;
 134                 }
 135
 136                 protected ObjRef (SerializationInfo info, StreamingContext context)
 137                 {
 138                         SerializationInfoEnumerator en = info.GetEnumerator();
 139                         // Info to serialize: uri, objrefFlags, typeInfo, envoyInfo, channelInfo
 140
 141                         bool marshalledValue = true;
 142
 143                         while (en.MoveNext ()) {
 144                                 switch (en.Name) {
 145                                 case "uri":
 146                                         uri = (string)en.Value;
 147                                         break;
 148                                 case "typeInfo":
 149                                         typeInfo = (IRemotingTypeInfo)en.Value;
 150                                         break;
 151                                 case "channelInfo":
 152                                         channel_info = (IChannelInfo)en.Value;
 153                                         break;
 154                                 case "envoyInfo":
 155                                         envoyInfo = (IEnvoyInfo)en.Value;
 156                                         break;
 157                                 case "fIsMarshalled":
 158                                         int status;
 159                                         Object o = en.Value;
 160                                         if (o is string)
 161                                                 status = ((IConvertible) o).ToInt32(null);
 162                                         else
 163                                                 status = (int) o;
 164
 165                                         if (status == 0)
 166                                                 marshalledValue = false;
 167                                         break;
 168                                 case "objrefFlags":
 169                                         flags = Convert.ToInt32 (en.Value);
 170                                         break;
 171                                 default:
 172                                         throw new NotSupportedException ();
 173                                 }
 174                         }
 175                         if (marshalledValue) flags |= MarshalledObjectRef;
 176                 }
 177
 178                 internal bool IsPossibleToCAD ()
 179                 {
 180                         // we should check if this obj ref belongs to a cross app context.
 181
 182                         // Return false. If not, serialization of this ObjRef will not work
 183                         // on the target AD.
 184                         return false;
 185                 }
 186
 187                 internal bool IsReferenceToWellKnow
 188                 {
 189                         get { return (flags & WellKnowObjectRef) > 0; }
 190                 }
 191
 192                 public virtual IChannelInfo ChannelInfo {
 193                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 194                         get {
 195                                 return channel_info;
 196                         }
 197
 198                         set {
 199                                 channel_info = value;
 200                         }
 201                 }
 202
 203                 public virtual IEnvoyInfo EnvoyInfo {
 204                         get {
 205                                 return envoyInfo;
 206                         }
 207                         set {
 208                                 envoyInfo = value;
 209                         }
 210                 }
 211
 212                 public virtual IRemotingTypeInfo TypeInfo {
 213                         get {
 214                                 return typeInfo;
 215                         }
 216                         set {
 217                                 typeInfo = value;
 218                         }
 219                 }
 220
 221                 public virtual string URI {
 222                         get {
 223                                 return uri;
 224                         }
 225                         set {
 226                                 uri = value;
 227                         }
 228                 }
 229
 230                 public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
 231                 {
 232                         info.SetType (GetType());
 233                         info.AddValue ("uri", uri);
 234                         info.AddValue ("typeInfo", typeInfo, typeof (IRemotingTypeInfo));
 235                         info.AddValue ("envoyInfo", envoyInfo, typeof (IEnvoyInfo));
 236                         info.AddValue ("channelInfo", channel_info, typeof(IChannelInfo));
 237                         info.AddValue ("objrefFlags", flags);
 238                 }
 239
 240                 public virtual object GetRealObject (StreamingContext context)
 241                 {
 242                         if ((flags & MarshalledObjectRef) > 0)
 243                                 return RemotingServices.Unmarshal (this);
 244                         else
 245                                 return this;
 246                 }
 247
 248                 public bool IsFromThisAppDomain ()
 249                 {
 250                         Identity identity = RemotingServices.GetIdentityForUri (uri);
 251                         if (identity == null) return false;             // URI not registered in this domain
 252
 253                         return identity.IsFromThisAppDomain;
 254                 }
 255
 256                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 257                 public bool IsFromThisProcess ()
 258                 {
 259                         foreach (object data in channel_info.ChannelData)
 260                         {
 261                                 if (data is CrossAppDomainData)
 262                                 {
 263                                         string refProcId = ((CrossAppDomainData)data).ProcessID;
 264                                         return (refProcId == RemotingConfiguration.ProcessId);
 265                                 }
 266                         }
 267
 268                         return true;
 269                 }
 270
 271                 internal void UpdateChannelInfo()
 272                 {
 273                         channel_info = new ChannelInfo ();
 274                 }
 275
 276                 internal Type ServerType
 277                 {
 278                         get
 279                         {
 280                                 if (_serverType == null) _serverType = Type.GetType (typeInfo.TypeName);
 281                                 return _serverType;
 282                         }
 283                 }
 284
 285                 internal void SetDomainID (int id)
 286                 {
 287                 }
 288         }
 289 }