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