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

   1 // Copyright 2004-2007 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
  23
  24         /// <summary>
  25         /// This <see cref="IThreadScopeInfo"/> implementation will first get the current scope from the current
  26         /// request, thus implementing a Session Per Request pattern.
  27         /// </summary>
  28         public class WebThreadScopeInfo : AbstractThreadScopeInfo
  29         {
  30         const string ActiveRecordCurrentStack = "activerecord.currentstack";
  31
  32                 /// <summary>
  33                 /// Gets the current stack.
  34                 /// </summary>
  35                 /// <value>The current stack.</value>
  36                 public override Stack CurrentStack
  37                 {
  38                         [MethodImpl(MethodImplOptions.Synchronized)]
  39                         get
  40                         {
  41                                 HttpContext current = HttpContext.Current;
  42
  43                                 if (current == null)
  44                                 {
  45                                         String message = "WebThreadScopeInfo: Could not access HttpContext.Current";
  46
  47                                         throw new ScopeMachineryException(message);
  48                                 }
  49
  50                             Stack stack = (Stack) current.Items[ActiveRecordCurrentStack];
  51
  52                                 if (stack == null)
  53                                 {
  54                                         stack = new Stack();
  55
  56                                         current.Items[ActiveRecordCurrentStack] = stack;
  57                                 }
  58
  59                                 return stack;
  60                         }
  61                 }
  62         }
  63 }