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 using System;
  14 using System.Runtime.Serialization;
  15 using System.Runtime.Remoting.Channels;
  16 using System.Runtime.Remoting.Messaging;
  17 using System.Runtime.Remoting.Proxies;
  18
  19 namespace System.Runtime.Remoting {
  20
  21         [Serializable]
  22         public class ObjRef : IObjectReference, ISerializable
  23         {
  24                 IChannelInfo channel_info;
  25                 string uri;
  26                 IRemotingTypeInfo typeInfo;
  27                 IEnvoyInfo envoyInfo;
  28                 int flags;
  29                 Type _serverType;
  30
  31                 static int MarshalledObjectRef = 1;
  32                 static int WellKnowObjectRef = 2;
  33
  34                 public ObjRef ()
  35                 {
  36                         // no idea why this needs to be public
  37
  38                         UpdateChannelInfo();
  39                 }
  40
  41                 internal ObjRef (string typeName, string uri, IChannelInfo cinfo)
  42                 {
  43                         this.uri = uri;
  44                         channel_info = cinfo;
  45                         typeInfo = new TypeInfo (Type.GetType (typeName));
  46                 }
  47
  48                 internal ObjRef (ObjRef o, bool unmarshalAsProxy) {
  49                         channel_info = o.channel_info;
  50                         uri = o.uri;
  51
  52                         typeInfo = o.typeInfo;
  53                         envoyInfo = o.envoyInfo;
  54                         flags = o.flags;
  55                         if (unmarshalAsProxy) flags |= MarshalledObjectRef;
  56                 }
  57
  58                 public ObjRef (MarshalByRefObject mbr, Type type)
  59                 {
  60                         if (mbr == null)
  61                                 throw new ArgumentNullException ("mbr");
  62
  63                         if (type == null)
  64                                 throw new ArgumentNullException ("type");
  65
  66                         // The ObjRef can only be constructed if the given mbr
  67                         // has already been marshalled using RemotingServices.Marshall
  68
  69                         uri = RemotingServices.GetObjectUri(mbr);
  70                         typeInfo = new TypeInfo(type);
  71
  72                         if (!typeInfo.CanCastTo(mbr.GetType(), mbr))
  73                                 throw new RemotingException ("The server object type cannot be cast to the requested type " + type.FullName + ".");
  74
  75                         UpdateChannelInfo();
  76                 }
  77
  78                 internal ObjRef (Type type, string url, object remoteChannelData)
  79                 {
  80                         uri = url;
  81                         typeInfo = new TypeInfo(type);
  82
  83                         if (remoteChannelData != null)
  84                                 channel_info = new ChannelInfo (remoteChannelData);
  85
  86                         flags |= WellKnowObjectRef;
  87                 }
  88
  89                 protected ObjRef (SerializationInfo si, StreamingContext sc)
  90                 {
  91                         SerializationInfoEnumerator en = si.GetEnumerator();
  92                         // Info to serialize: uri, objrefFlags, typeInfo, envoyInfo, channelInfo
  93
  94                         bool marshalledValue = true;
  95
  96                         while (en.MoveNext ()) {
  97                                 switch (en.Name) {
  98                                 case "uri":
  99                                         uri = (string)en.Value;
 100                                         break;
 101                                 case "typeInfo":
 102                                         typeInfo = (IRemotingTypeInfo)en.Value;
 103                                         break;
 104                                 case "channelInfo":
 105                                         channel_info = (IChannelInfo)en.Value;
 106                                         break;
 107                                 case "envoyInfo":
 108                                         envoyInfo = (IEnvoyInfo)en.Value;
 109                                         break;
 110                                 case "fIsMarshalled":
 111                                         int status;
 112                                         Object o = en.Value;
 113                                         if (o is string)
 114                                                 status = ((IConvertible) o).ToInt32(null);
 115                                         else
 116                                                 status = (int) o;
 117
 118                                         if (status == 0)
 119                                                 marshalledValue = false;
 120                                         break;
 121                                 case "objrefFlags":
 122                                         flags = Convert.ToInt32 (en.Value);
 123                                         break;
 124                                 default:
 125                                         throw new NotSupportedException ();
 126                                 }
 127                         }
 128                         if (marshalledValue) flags |= MarshalledObjectRef;
 129                 }
 130
 131                 internal bool IsPossibleToCAD ()
 132                 {
 133                         // we should check if this obj ref belongs to a cross app context.
 134
 135                         // Return false. If not, serialization of this ObjRef will not work
 136                         // on the target AD.
 137                         return false;
 138                 }
 139
 140                 internal bool IsReferenceToWellKnow
 141                 {
 142                         get { return (flags & WellKnowObjectRef) > 0; }
 143                 }
 144
 145                 public virtual IChannelInfo ChannelInfo {
 146
 147                         get {
 148                                 return channel_info;
 149                         }
 150
 151                         set {
 152                                 channel_info = value;
 153                         }
 154                 }
 155
 156                 public virtual IEnvoyInfo EnvoyInfo {
 157                         get {
 158                                 return envoyInfo;
 159                         }
 160                         set {
 161                                 envoyInfo = value;
 162                         }
 163                 }
 164
 165                 public virtual IRemotingTypeInfo TypeInfo {
 166                         get {
 167                                 return typeInfo;
 168                         }
 169                         set {
 170                                 typeInfo = value;
 171                         }
 172                 }
 173
 174                 public virtual string URI {
 175                         get {
 176                                 return uri;
 177                         }
 178                         set {
 179                                 uri = value;
 180                         }
 181                 }
 182
 183                 public virtual void GetObjectData (SerializationInfo si, StreamingContext sc)
 184                 {
 185                         si.SetType (GetType());
 186                         si.AddValue ("uri", uri);
 187                         si.AddValue ("typeInfo", typeInfo, typeof (IRemotingTypeInfo));
 188                         si.AddValue ("envoyInfo", envoyInfo, typeof (IEnvoyInfo));
 189                         si.AddValue ("channelInfo", channel_info, typeof(IChannelInfo));
 190                         si.AddValue ("objrefFlags", flags);
 191                 }
 192
 193                 public virtual object GetRealObject (StreamingContext sc)
 194                 {
 195                         if ((flags & MarshalledObjectRef) > 0)
 196                                 return RemotingServices.Unmarshal (this);
 197                         else
 198                                 return this;
 199                 }
 200
 201                 public bool IsFromThisAppDomain ()
 202                 {
 203                         Identity identity = RemotingServices.GetIdentityForUri (uri);
 204                         if (identity == null) return false;             // URI not registered in this domain
 205
 206                         return identity.IsFromThisAppDomain;
 207                 }
 208
 209                 public bool IsFromThisProcess ()
 210                 {
 211                         foreach (object data in channel_info.ChannelData)
 212                         {
 213                                 if (data is CrossAppDomainData)
 214                                 {
 215                                         string refProcId = ((CrossAppDomainData)data).ProcessID;
 216                                         return (refProcId == RemotingConfiguration.ProcessId);
 217                                 }
 218                         }
 219
 220                         return true;
 221                 }
 222
 223                 internal void UpdateChannelInfo()
 224                 {
 225                         channel_info = new ChannelInfo ();
 226                 }
 227
 228                 internal Type ServerType
 229                 {
 230                         get
 231                         {
 232                                 if (_serverType == null) _serverType = Type.GetType (typeInfo.TypeName);
 233                                 return _serverType;
 234                         }
 235                 }
 236         }
 237 }