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 #if NET_2_0
  46         [System.Runtime.InteropServices.ComVisible (true)]
  47 #endif
  48         public sealed class CallContext
  49         {
  50                 [ThreadStatic] static Header [] Headers;
  51                 [ThreadStatic] static Hashtable datastore;
  52
  53                 private CallContext ()
  54                 {
  55                 }
  56
  57                 // public methods
  58                 public static void FreeNamedDataSlot (string name)
  59                 {
  60                         Datastore.Remove (name);
  61                 }
  62
  63                 public static object GetData (string name)
  64                 {
  65                         return Datastore [name];
  66                 }
  67
  68                 public static void SetData (string name, object data)
  69                 {
  70                         Datastore [name] = data;
  71                 }
  72
  73                 public static Header[] GetHeaders ()
  74                 {
  75                         return Headers;
  76                 }
  77
  78                 public static void SetHeaders (Header[] headers)
  79                 {
  80                         Headers = headers;
  81                 }
  82
  83                 internal static LogicalCallContext CreateLogicalCallContext (bool createEmpty)
  84                 {
  85                         LogicalCallContext ctx = null;
  86                         if (datastore != null) {
  87                                 foreach (DictionaryEntry entry in datastore)
  88                                         if (entry.Value is ILogicalThreadAffinative) {
  89                                                 if (ctx == null) ctx = new LogicalCallContext ();
  90                                                 ctx.SetData ((string)entry.Key, entry.Value);
  91                                         }
  92                         }
  93
  94                         if (ctx == null && createEmpty)
  95                                 return new LogicalCallContext ();
  96                         else
  97                                 return ctx;
  98                 }
  99
 100                 internal static object SetCurrentCallContext (LogicalCallContext ctx)
 101                 {
 102                         object oldData = datastore;
 103
 104                         if (ctx != null && ctx.HasInfo)
 105                                 datastore = (Hashtable) ctx.Datastore.Clone ();
 106                         else
 107                                 datastore = null;
 108
 109                         return oldData;
 110                 }
 111
 112                 internal static void UpdateCurrentCallContext (LogicalCallContext ctx)
 113                 {
 114                         Hashtable data = ctx.Datastore;
 115                         foreach (DictionaryEntry entry in data)
 116                                 SetData ((string)entry.Key, entry.Value);
 117                 }
 118
 119                 internal static void RestoreCallContext (object oldContext)
 120                 {
 121                         datastore = (Hashtable) oldContext;
 122                 }
 123
 124                 private static Hashtable Datastore
 125                 {
 126                         get {
 127                                 Hashtable r = datastore;
 128                                 if (r == null)
 129                                         return datastore = new Hashtable ();
 130                                 return r;
 131                         }
 132                 }
 133         }
 134
 135 #if NET_2_0
 136         [System.Runtime.InteropServices.ComVisible (true)]
 137 #endif
 138         public interface ILogicalThreadAffinative
 139         {
 140         }
 141 }