ActiveRecord/Castle.ActiveRecord/Framework/Scopes/WebThreadScopeInfo.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.ActiveRecord.Framework.Scopes
  16 {
  17         using System;
  18         using System.Collections;
  19         using System.Runtime.CompilerServices;
  20         using System.Web;
  21
  22         /// <summary>
  23         /// This <see cref="IThreadScopeInfo"/> implementation will first get the current scope from the current
  24         /// request, thus implementing a Session Per Request pattern.
  25         /// </summary>
  26         public class WebThreadScopeInfo : AbstractThreadScopeInfo, IWebThreadScopeInfo
  27         {
  28                 const string ActiveRecordCurrentStack = "activerecord.currentstack";
  29
  30                 /// <summary>
  31                 /// Gets the current stack.
  32                 /// </summary>
  33                 /// <value>The current stack.</value>
  34                 public override Stack CurrentStack
  35                 {
  36                         [MethodImpl(MethodImplOptions.Synchronized)]
  37                         get
  38                         {
  39                                 HttpContext current = HttpContext.Current;
  40
  41                                 if (current == null)
  42                                 {
  43                                         String message = "WebThreadScopeInfo: Could not access HttpContext.Current";
  44
  45                                         throw new ScopeMachineryException(message);
  46                                 }
  47
  48                                 Stack stack = (Stack)current.Items[ActiveRecordCurrentStack];
  49
  50                                 if (stack == null)
  51                                 {
  52                                         stack = new Stack();
  53
  54                                         current.Items[ActiveRecordCurrentStack] = stack;
  55                                 }
  56
  57                                 return stack;
  58                         }
  59                 }
  60         }
  61 }