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

   1 //
   2 // System.Runtime.Remoting.Messaging.CallContext.cs
   3 //
   4 // Authors: Jaime Anguiano Olarra (jaime@gnome.org)
   5 //         Lluis Sanchez Gual (lluis@ximian.com)
   6 //          Marek Safar (marek.safar@gmail.com)
   7 //
   8 // (c) 2002, Jaime Anguiano Olarra
   9 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  10 // Copyright (C) 2014 Xamarin Inc (http://www.xamarin.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Threading;
  34 using System.Collections;
  35 using System.Collections.Generic;
  36
  37 namespace System.Runtime.Remoting.Messaging
  38 {
  39         [Serializable]
  40         [System.Runtime.InteropServices.ComVisible (true)]
  41         public sealed class CallContext
  42         {
  43                 [ThreadStatic] static Header [] Headers;
  44                 [ThreadStatic] static object hostContext;
  45
  46                 private CallContext ()
  47                 {
  48                 }
  49
  50                 public static object HostContext {
  51                         get { return hostContext; }
  52                         set { hostContext = value; }
  53                 }
  54
  55                 public static void FreeNamedDataSlot (string name)
  56                 {
  57                         ExecutionContext.FreeNamedDataSlot (name);
  58                 }
  59
  60                 public static object GetData (string name)
  61                 {
  62                         var value = LogicalGetData (name);
  63                         if (value == null)
  64                                 Datastore.TryGetValue (name, out value);
  65
  66                         return value;
  67                 }
  68
  69                 public static void SetData (string name, object data)
  70                 {
  71                         if (data is ILogicalThreadAffinative) {
  72                                 LogicalSetData (name, data);
  73                         } else {
  74                                 var ec = ExecutionContext.GetCurrentWritable ();
  75                                 ec.LogicalCallContext.FreeNamedDataSlot (name);
  76                                 ec.DataStore [name] = data;
  77                         }
  78                 }
  79
  80                 public static object LogicalGetData (string name)
  81                 {
  82                         return LogicalContext.GetData (name);
  83                 }
  84
  85                 public static void LogicalSetData (string name, object data)
  86                 {
  87                         var ec = ExecutionContext.GetCurrentWritable ();
  88                         ec.DataStore.Remove (name);
  89                         ec.LogicalCallContext.SetData (name, data);
  90                 }
  91
  92                 public static Header[] GetHeaders ()
  93                 {
  94                         return Headers;
  95                 }
  96
  97                 public static void SetHeaders (Header[] headers)
  98                 {
  99                         Headers = headers;
 100                 }
 101
 102                 internal static object SetCurrentCallContext (LogicalCallContext ctx)
 103                 {
 104                         object oldData = new object[] { Datastore, LogicalContext.Datastore };
 105
 106                         Hashtable logicalDatastore;
 107                         if (ctx != null && ctx.HasInfo)
 108                                 logicalDatastore = (Hashtable) ctx.Datastore.Clone ();
 109                         else
 110                                 logicalDatastore = null;
 111
 112                         LogicalContext.Datastore = logicalDatastore;
 113                         return oldData;
 114                 }
 115
 116                 internal static void UpdateCurrentLogicalCallContext (LogicalCallContext ctx)
 117                 {
 118                         Hashtable data = ctx.Datastore;
 119                         if (data == null)
 120                                 return;
 121
 122                         foreach (DictionaryEntry entry in data)
 123                                 LogicalSetData ((string)entry.Key, entry.Value);
 124                 }
 125
 126                 internal static void RestoreCallContext (object oldContext)
 127                 {
 128                         object[] contextArray = (object[])oldContext;
 129                         ExecutionContext.DataStore = (Dictionary<string, object>)contextArray [0];
 130                         LogicalContext.Datastore = (Hashtable)contextArray [1];
 131                 }
 132
 133                 static Dictionary<string, object> Datastore {
 134                         get {
 135                                 return ExecutionContext.DataStore;
 136                         }
 137                 }
 138
 139                 static LogicalCallContext LogicalContext {
 140                         get {
 141                                 return ExecutionContext.LogicalCallContext;
 142                         }
 143                 }
 144
 145                 static ExecutionContext ExecutionContext {
 146                         get {
 147                                 return ExecutionContext.Current;
 148                         }
 149                 }
 150         }
 151
 152         [System.Runtime.InteropServices.ComVisible (true)]
 153         public interface ILogicalThreadAffinative
 154         {
 155         }
 156 }