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.Runtime.Serialization;
  38 using System.Runtime.Remoting.Channels;
  39 using System.Runtime.Remoting.Messaging;
  40 using System.Runtime.Remoting.Proxies;
  41
  42 #if NET_2_0
  43 using System.Runtime.ConstrainedExecution;
  44 #endif
  45
  46 namespace System.Runtime.Remoting {
  47
  48         [Serializable]
  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 typeName, string uri, IChannelInfo cinfo)
  69                 {
  70                         this.uri = uri;
  71                         channel_info = cinfo;
  72                         typeInfo = new TypeInfo (Type.GetType (typeName));
  73                 }
  74
  75                 internal ObjRef (ObjRef o, bool unmarshalAsProxy) {
  76                         channel_info = o.channel_info;
  77                         uri = o.uri;
  78
  79                         typeInfo = o.typeInfo;
  80                         envoyInfo = o.envoyInfo;
  81                         flags = o.flags;
  82                         if (unmarshalAsProxy) flags |= MarshalledObjectRef;
  83                 }
  84
  85                 public ObjRef (MarshalByRefObject mbr, Type type)
  86                 {
  87                         if (mbr == null)
  88                                 throw new ArgumentNullException ("mbr");
  89
  90                         if (type == null)
  91                                 throw new ArgumentNullException ("type");
  92
  93                         // The ObjRef can only be constructed if the given mbr
  94                         // has already been marshalled using RemotingServices.Marshall
  95
  96                         uri = RemotingServices.GetObjectUri(mbr);
  97                         typeInfo = new TypeInfo(type);
  98
  99                         if (!type.IsInstanceOfType (mbr))
 100                                 throw new RemotingException ("The server object type cannot be cast to the requested type " + type.FullName + ".");
 101
 102                         UpdateChannelInfo();
 103                 }
 104
 105                 internal ObjRef (Type type, string url, object remoteChannelData)
 106                 {
 107                         uri = url;
 108                         typeInfo = new TypeInfo(type);
 109
 110                         if (remoteChannelData != null)
 111                                 channel_info = new ChannelInfo (remoteChannelData);
 112
 113                         flags |= WellKnowObjectRef;
 114                 }
 115
 116                 protected ObjRef (SerializationInfo si, StreamingContext sc)
 117                 {
 118                         SerializationInfoEnumerator en = si.GetEnumerator();
 119                         // Info to serialize: uri, objrefFlags, typeInfo, envoyInfo, channelInfo
 120
 121                         bool marshalledValue = true;
 122
 123                         while (en.MoveNext ()) {
 124                                 switch (en.Name) {
 125                                 case "uri":
 126                                         uri = (string)en.Value;
 127                                         break;
 128                                 case "typeInfo":
 129                                         typeInfo = (IRemotingTypeInfo)en.Value;
 130                                         break;
 131                                 case "channelInfo":
 132                                         channel_info = (IChannelInfo)en.Value;
 133                                         break;
 134                                 case "envoyInfo":
 135                                         envoyInfo = (IEnvoyInfo)en.Value;
 136                                         break;
 137                                 case "fIsMarshalled":
 138                                         int status;
 139                                         Object o = en.Value;
 140                                         if (o is string)
 141                                                 status = ((IConvertible) o).ToInt32(null);
 142                                         else
 143                                                 status = (int) o;
 144
 145                                         if (status == 0)
 146                                                 marshalledValue = false;
 147                                         break;
 148                                 case "objrefFlags":
 149                                         flags = Convert.ToInt32 (en.Value);
 150                                         break;
 151                                 default:
 152                                         throw new NotSupportedException ();
 153                                 }
 154                         }
 155                         if (marshalledValue) flags |= MarshalledObjectRef;
 156                 }
 157
 158                 internal bool IsPossibleToCAD ()
 159                 {
 160                         // we should check if this obj ref belongs to a cross app context.
 161
 162                         // Return false. If not, serialization of this ObjRef will not work
 163                         // on the target AD.
 164                         return false;
 165                 }
 166
 167                 internal bool IsReferenceToWellKnow
 168                 {
 169                         get { return (flags & WellKnowObjectRef) > 0; }
 170                 }
 171
 172                 public virtual IChannelInfo ChannelInfo {
 173 #if NET_2_0
 174                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 175 #endif
 176                         get {
 177                                 return channel_info;
 178                         }
 179
 180                         set {
 181                                 channel_info = value;
 182                         }
 183                 }
 184
 185                 public virtual IEnvoyInfo EnvoyInfo {
 186                         get {
 187                                 return envoyInfo;
 188                         }
 189                         set {
 190                                 envoyInfo = value;
 191                         }
 192                 }
 193
 194                 public virtual IRemotingTypeInfo TypeInfo {
 195                         get {
 196                                 return typeInfo;
 197                         }
 198                         set {
 199                                 typeInfo = value;
 200                         }
 201                 }
 202
 203                 public virtual string URI {
 204                         get {
 205                                 return uri;
 206                         }
 207                         set {
 208                                 uri = value;
 209                         }
 210                 }
 211
 212                 public virtual void GetObjectData (SerializationInfo si, StreamingContext sc)
 213                 {
 214                         si.SetType (GetType());
 215                         si.AddValue ("uri", uri);
 216                         si.AddValue ("typeInfo", typeInfo, typeof (IRemotingTypeInfo));
 217                         si.AddValue ("envoyInfo", envoyInfo, typeof (IEnvoyInfo));
 218                         si.AddValue ("channelInfo", channel_info, typeof(IChannelInfo));
 219                         si.AddValue ("objrefFlags", flags);
 220                 }
 221
 222                 public virtual object GetRealObject (StreamingContext sc)
 223                 {
 224                         if ((flags & MarshalledObjectRef) > 0)
 225                                 return RemotingServices.Unmarshal (this);
 226                         else
 227                                 return this;
 228                 }
 229
 230                 public bool IsFromThisAppDomain ()
 231                 {
 232                         Identity identity = RemotingServices.GetIdentityForUri (uri);
 233                         if (identity == null) return false;             // URI not registered in this domain
 234
 235                         return identity.IsFromThisAppDomain;
 236                 }
 237
 238 #if NET_2_0
 239                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 240 #endif
 241                 public bool IsFromThisProcess ()
 242                 {
 243                         foreach (object data in channel_info.ChannelData)
 244                         {
 245                                 if (data is CrossAppDomainData)
 246                                 {
 247                                         string refProcId = ((CrossAppDomainData)data).ProcessID;
 248                                         return (refProcId == RemotingConfiguration.ProcessId);
 249                                 }
 250                         }
 251
 252                         return true;
 253                 }
 254
 255                 internal void UpdateChannelInfo()
 256                 {
 257                         channel_info = new ChannelInfo ();
 258                 }
 259
 260                 internal Type ServerType
 261                 {
 262                         get
 263                         {
 264                                 if (_serverType == null) _serverType = Type.GetType (typeInfo.TypeName);
 265                                 return _serverType;
 266                         }
 267                 }
 268         }
 269 }