mcs/class/corlib/System.Runtime.Remoting.Messaging/CallContext.cs

   1 //
   2 // System.Runtime.Remoting.Messaging.CallContext.cs
   3 //
   4 // Author: Jaime Anguiano Olarra (jaime@gnome.org)
   5 //         Lluis Sanchez Gual (lluis@ximian.com)
   6 //
   7 // (c) 2002, Jaime Anguiano Olarra
   8 //
   9 ///<summary>
  10 ///Provides several properties that come with the execution code path.
  11 ///This class is sealed.
  12 ///</summary>
  13
  14 //
  15 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  16 //
  17 // Permission is hereby granted, free of charge, to any person obtaining
  18 // a copy of this software and associated documentation files (the
  19 // "Software"), to deal in the Software without restriction, including
  20 // without limitation the rights to use, copy, modify, merge, publish,
  21 // distribute, sublicense, and/or sell copies of the Software, and to
  22 // permit persons to whom the Software is furnished to do so, subject to
  23 // the following conditions:
  24 //
  25 // The above copyright notice and this permission notice shall be
  26 // included in all copies or substantial portions of the Software.
  27 //
  28 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  29 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  30 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  31 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  32 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  33 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  34 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  35 //
  36
  37 using System;
  38 using System.Threading;
  39 using System.Collections;
  40
  41 namespace System.Runtime.Remoting.Messaging
  42 {
  43
  44         [Serializable]
  45         [System.Runtime.InteropServices.ComVisible (true)]
  46         public sealed class CallContext
  47         {
  48                 [ThreadStatic] static Header [] Headers;
  49                 [ThreadStatic] static Hashtable datastore;
  50                 [ThreadStatic] static object hostContext;
  51
  52                 private CallContext ()
  53                 {
  54                 }
  55
  56                 public static object HostContext {
  57                         get { return hostContext; }
  58                         set { hostContext = value; }
  59                 }
  60
  61                 // public methods
  62                 public static void FreeNamedDataSlot (string name)
  63                 {
  64                         Datastore.Remove (name);
  65                 }
  66
  67                 public static object GetData (string name)
  68                 {
  69                         return Datastore [name];
  70                 }
  71
  72                 public static void SetData (string name, object data)
  73                 {
  74                         Datastore [name] = data;
  75                 }
  76
  77                 [MonoTODO]
  78                 public static object LogicalGetData (string name)
  79                 {
  80                         throw new NotImplementedException ();
  81                 }
  82
  83                 [MonoTODO]
  84                 public static void LogicalSetData (string name, object data)
  85                 {
  86                         throw new NotImplementedException ();
  87                 }
  88
  89                 public static Header[] GetHeaders ()
  90                 {
  91                         return Headers;
  92                 }
  93
  94                 public static void SetHeaders (Header[] headers)
  95                 {
  96                         Headers = headers;
  97                 }
  98
  99                 internal static LogicalCallContext CreateLogicalCallContext (bool createEmpty)
 100                 {
 101                         LogicalCallContext ctx = null;
 102                         if (datastore != null) {
 103                                 foreach (DictionaryEntry entry in datastore)
 104                                         if (entry.Value is ILogicalThreadAffinative) {
 105                                                 if (ctx == null) ctx = new LogicalCallContext ();
 106                                                 ctx.SetData ((string)entry.Key, entry.Value);
 107                                         }
 108                         }
 109
 110                         if (ctx == null && createEmpty)
 111                                 return new LogicalCallContext ();
 112                         else
 113                                 return ctx;
 114                 }
 115
 116                 internal static object SetCurrentCallContext (LogicalCallContext ctx)
 117                 {
 118                         object oldData = datastore;
 119
 120                         if (ctx != null && ctx.HasInfo)
 121                                 datastore = (Hashtable) ctx.Datastore.Clone ();
 122                         else
 123                                 datastore = null;
 124
 125                         return oldData;
 126                 }
 127
 128                 internal static void UpdateCurrentCallContext (LogicalCallContext ctx)
 129                 {
 130                         Hashtable data = ctx.Datastore;
 131                         foreach (DictionaryEntry entry in data)
 132                                 SetData ((string)entry.Key, entry.Value);
 133                 }
 134
 135                 internal static void RestoreCallContext (object oldContext)
 136                 {
 137                         datastore = (Hashtable) oldContext;
 138                 }
 139
 140                 private static Hashtable Datastore
 141                 {
 142                         get {
 143                                 Hashtable r = datastore;
 144                                 if (r == null)
 145                                         return datastore = new Hashtable ();
 146                                 return r;
 147                         }
 148                 }
 149         }
 150
 151         [System.Runtime.InteropServices.ComVisible (true)]
 152         public interface ILogicalThreadAffinative
 153         {
 154         }
 155 }