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.Runtime.Serialization;
  38 using System.Runtime.Remoting.Channels;
  39 using System.Runtime.Remoting.Messaging;
  40 using System.Runtime.Remoting.Proxies;
  41
  42 using System.Runtime.ConstrainedExecution;
  43
  44 namespace System.Runtime.Remoting {
  45
  46         [Serializable]
  47         [System.Runtime.InteropServices.ComVisible (true)]
  48         public class ObjRef : IObjectReference, ISerializable
  49         {
  50                 IChannelInfo channel_info;
  51                 string uri;
  52                 IRemotingTypeInfo typeInfo;
  53                 IEnvoyInfo envoyInfo;
  54                 int flags;
  55                 Type _serverType;
  56
  57                 static int MarshalledObjectRef = 1;
  58                 static int WellKnowObjectRef = 2;
  59
  60                 public ObjRef ()
  61                 {
  62                         // no idea why this needs to be public
  63
  64                         UpdateChannelInfo();
  65                 }
  66
  67                 internal ObjRef (string typeName, string uri, IChannelInfo cinfo)
  68                 {
  69                         this.uri = uri;
  70                         channel_info = cinfo;
  71                         typeInfo = new TypeInfo (Type.GetType (typeName, true));
  72                 }
  73
  74                 internal ObjRef (ObjRef o, bool unmarshalAsProxy) {
  75                         channel_info = o.channel_info;
  76                         uri = o.uri;
  77
  78                         typeInfo = o.typeInfo;
  79                         envoyInfo = o.envoyInfo;
  80                         flags = o.flags;
  81                         if (unmarshalAsProxy) flags |= MarshalledObjectRef;
  82                 }
  83
  84                 public ObjRef (MarshalByRefObject o, Type requestedType)
  85                 {
  86                         if (o == null)
  87                                 throw new ArgumentNullException ("o");
  88
  89                         if (requestedType == null)
  90                                 throw new ArgumentNullException ("requestedType");
  91
  92                         // The ObjRef can only be constructed if the given o
  93                         // has already been marshalled using RemotingServices.Marshall
  94
  95                         uri = RemotingServices.GetObjectUri (o);
  96                         typeInfo = new TypeInfo (requestedType);
  97
  98                         if (!requestedType.IsInstanceOfType (o))
  99                                 throw new RemotingException ("The server object type cannot be cast to the requested type " + requestedType.FullName);
 100
 101                         UpdateChannelInfo();
 102                 }
 103
 104                 internal ObjRef (Type type, string url, object remoteChannelData)
 105                 {
 106                         uri = url;
 107                         typeInfo = new TypeInfo(type);
 108
 109                         if (remoteChannelData != null)
 110                                 channel_info = new ChannelInfo (remoteChannelData);
 111
 112                         flags |= WellKnowObjectRef;
 113                 }
 114
 115                 protected ObjRef (SerializationInfo info, StreamingContext context)
 116                 {
 117                         SerializationInfoEnumerator en = info.GetEnumerator();
 118                         // Info to serialize: uri, objrefFlags, typeInfo, envoyInfo, channelInfo
 119
 120                         bool marshalledValue = true;
 121
 122                         while (en.MoveNext ()) {
 123                                 switch (en.Name) {
 124                                 case "uri":
 125                                         uri = (string)en.Value;
 126                                         break;
 127                                 case "typeInfo":
 128                                         typeInfo = (IRemotingTypeInfo)en.Value;
 129                                         break;
 130                                 case "channelInfo":
 131                                         channel_info = (IChannelInfo)en.Value;
 132                                         break;
 133                                 case "envoyInfo":
 134                                         envoyInfo = (IEnvoyInfo)en.Value;
 135                                         break;
 136                                 case "fIsMarshalled":
 137                                         int status;
 138                                         Object o = en.Value;
 139                                         if (o is string)
 140                                                 status = ((IConvertible) o).ToInt32(null);
 141                                         else
 142                                                 status = (int) o;
 143
 144                                         if (status == 0)
 145                                                 marshalledValue = false;
 146                                         break;
 147                                 case "objrefFlags":
 148                                         flags = Convert.ToInt32 (en.Value);
 149                                         break;
 150                                 default:
 151                                         throw new NotSupportedException ();
 152                                 }
 153                         }
 154                         if (marshalledValue) flags |= MarshalledObjectRef;
 155                 }
 156
 157                 internal bool IsPossibleToCAD ()
 158                 {
 159                         // we should check if this obj ref belongs to a cross app context.
 160
 161                         // Return false. If not, serialization of this ObjRef will not work
 162                         // on the target AD.
 163                         return false;
 164                 }
 165
 166                 internal bool IsReferenceToWellKnow
 167                 {
 168                         get { return (flags & WellKnowObjectRef) > 0; }
 169                 }
 170
 171                 public virtual IChannelInfo ChannelInfo {
 172                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 173                         get {
 174                                 return channel_info;
 175                         }
 176
 177                         set {
 178                                 channel_info = value;
 179                         }
 180                 }
 181
 182                 public virtual IEnvoyInfo EnvoyInfo {
 183                         get {
 184                                 return envoyInfo;
 185                         }
 186                         set {
 187                                 envoyInfo = value;
 188                         }
 189                 }
 190
 191                 public virtual IRemotingTypeInfo TypeInfo {
 192                         get {
 193                                 return typeInfo;
 194                         }
 195                         set {
 196                                 typeInfo = value;
 197                         }
 198                 }
 199
 200                 public virtual string URI {
 201                         get {
 202                                 return uri;
 203                         }
 204                         set {
 205                                 uri = value;
 206                         }
 207                 }
 208
 209                 public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
 210                 {
 211                         info.SetType (GetType());
 212                         info.AddValue ("uri", uri);
 213                         info.AddValue ("typeInfo", typeInfo, typeof (IRemotingTypeInfo));
 214                         info.AddValue ("envoyInfo", envoyInfo, typeof (IEnvoyInfo));
 215                         info.AddValue ("channelInfo", channel_info, typeof(IChannelInfo));
 216                         info.AddValue ("objrefFlags", flags);
 217                 }
 218
 219                 public virtual object GetRealObject (StreamingContext context)
 220                 {
 221                         if ((flags & MarshalledObjectRef) > 0)
 222                                 return RemotingServices.Unmarshal (this);
 223                         else
 224                                 return this;
 225                 }
 226
 227                 public bool IsFromThisAppDomain ()
 228                 {
 229                         Identity identity = RemotingServices.GetIdentityForUri (uri);
 230                         if (identity == null) return false;             // URI not registered in this domain
 231
 232                         return identity.IsFromThisAppDomain;
 233                 }
 234
 235                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 236                 public bool IsFromThisProcess ()
 237                 {
 238                         foreach (object data in channel_info.ChannelData)
 239                         {
 240                                 if (data is CrossAppDomainData)
 241                                 {
 242                                         string refProcId = ((CrossAppDomainData)data).ProcessID;
 243                                         return (refProcId == RemotingConfiguration.ProcessId);
 244                                 }
 245                         }
 246
 247                         return true;
 248                 }
 249
 250                 internal void UpdateChannelInfo()
 251                 {
 252                         channel_info = new ChannelInfo ();
 253                 }
 254
 255                 internal Type ServerType
 256                 {
 257                         get
 258                         {
 259                                 if (_serverType == null) _serverType = Type.GetType (typeInfo.TypeName);
 260                                 return _serverType;
 261                         }
 262                 }
 263         }
 264 }