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 logicalDatastore;
  50                 [ThreadStatic] static Hashtable datastore;
  51                 [ThreadStatic] static object hostContext;
  52
  53                 private CallContext ()
  54                 {
  55                 }
  56
  57                 public static object HostContext {
  58                         get { return hostContext; }
  59                         set { hostContext = value; }
  60                 }
  61
  62                 // public methods
  63                 public static void FreeNamedDataSlot (string name)
  64                 {
  65                         Datastore.Remove (name);
  66                         LogicalDatastore.Remove (name);
  67                 }
  68
  69                 public static object GetData (string name)
  70                 {
  71                         if (LogicalDatastore.ContainsKey (name)) {
  72                                 return LogicalDatastore [name];
  73                         } else {
  74                                 return Datastore [name];
  75                         }
  76                 }
  77
  78                 public static void SetData (string name, object data)
  79                 {
  80                         if (data is ILogicalThreadAffinative) {
  81                                 LogicalSetData (name, data);
  82                         } else {
  83                                 LogicalDatastore.Remove (name);
  84                                 Datastore [name] = data;
  85                         }
  86                 }
  87
  88                 public static object LogicalGetData (string name)
  89                 {
  90                         return LogicalDatastore [name];
  91                 }
  92
  93                 public static void LogicalSetData (string name, object data)
  94                 {
  95                         Datastore.Remove (name);
  96                         LogicalDatastore [name] = data;
  97                 }
  98
  99                 public static Header[] GetHeaders ()
 100                 {
 101                         return Headers;
 102                 }
 103
 104                 public static void SetHeaders (Header[] headers)
 105                 {
 106                         Headers = headers;
 107                 }
 108
 109                 internal static LogicalCallContext CreateLogicalCallContext (bool createEmpty)
 110                 {
 111                         LogicalCallContext ctx = null;
 112                         if (logicalDatastore != null) {
 113                                 ctx = new LogicalCallContext ();
 114                                 foreach (DictionaryEntry entry in logicalDatastore) {
 115                                         ctx.SetData ((string)entry.Key, entry.Value);
 116                                 }
 117                         }
 118
 119                         if (ctx == null && createEmpty)
 120                                 return new LogicalCallContext ();
 121                         else
 122                                 return ctx;
 123                 }
 124
 125                 internal static object SetCurrentCallContext (LogicalCallContext ctx)
 126                 {
 127                         object oldData = new object[] { datastore, logicalDatastore };
 128
 129                         if (ctx != null && ctx.HasInfo)
 130                                 logicalDatastore = (Hashtable) ctx.Datastore.Clone ();
 131                         else
 132                                 logicalDatastore = null;
 133
 134                         return oldData;
 135                 }
 136
 137                 internal static void UpdateCurrentLogicalCallContext (LogicalCallContext ctx)
 138                 {
 139                         Hashtable data = ctx.Datastore;
 140                         if (data == null)
 141                                 return;
 142
 143                         foreach (DictionaryEntry entry in data)
 144                                 LogicalSetData ((string)entry.Key, entry.Value);
 145                 }
 146
 147                 internal static void RestoreCallContext (object oldContext)
 148                 {
 149                         object[] contextArray = (object[])oldContext;
 150                         datastore = (Hashtable)contextArray [0];
 151                         logicalDatastore = (Hashtable)contextArray [1];
 152                 }
 153
 154                 private static Hashtable Datastore
 155                 {
 156                         get {
 157                                 Hashtable r = datastore;
 158                                 if (r == null)
 159                                         return datastore = new Hashtable ();
 160                                 return r;
 161                         }
 162                 }
 163
 164                 private static Hashtable LogicalDatastore
 165                 {
 166                         get {
 167                                 Hashtable r = logicalDatastore;
 168                                 if (r == null)
 169                                         return logicalDatastore = new Hashtable ();
 170                                 return r;
 171                         }
 172                 }
 173         }
 174
 175         [System.Runtime.InteropServices.ComVisible (true)]
 176         public interface ILogicalThreadAffinative
 177         {
 178         }
 179 }