mcs/class/System.Web/System.Web/TimeoutManager.cs

   1 //
   2 // System.Web.TimeoutManager
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2003 Novell, Inc (http://www.novell.com)
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Collections;
  33 using System.Threading;
  34 using System.Web.Configuration;
  35
  36 namespace System.Web
  37 {
  38         class StepTimeout
  39         {
  40         }
  41
  42         class TimeoutManager
  43         {
  44                 Timer timer;
  45                 Hashtable contexts;
  46
  47                 public TimeoutManager ()
  48                 {
  49                         contexts = Hashtable.Synchronized (new Hashtable ());
  50                         timer = new Timer (new TimerCallback (CheckTimeouts), null, 0, 15000);
  51
  52                         /*
  53                          * To prevent the compiler from issuing a warning, we need to keep a
  54                          * reference to the timer so it is not disposed
  55                          */
  56                         if (timer == null)
  57                                 timer = null;
  58                 }
  59
  60                 public void Add (HttpContext context)
  61                 {
  62                         object value = contexts [context];
  63                         if (value == null) {
  64                                 value = Thread.CurrentThread;
  65                         } else if (value is Thread) {
  66                                 ArrayList list = new ArrayList ();
  67                                 list.Add (value);
  68                                 list.Add (Thread.CurrentThread);
  69                                 value = list;
  70                         } else {
  71                                 ArrayList list = (ArrayList) value;
  72                                 list.Add (Thread.CurrentThread);
  73                                 value = list;
  74                         }
  75
  76                         lock (this) {
  77                                 contexts [context] = value;
  78                         }
  79                 }
  80
  81                 public Thread Remove (HttpContext context)
  82                 {
  83                         object value = contexts [context];
  84                         if (value == null)
  85                                 return null;
  86
  87                         if (value is Thread) {
  88                                 lock (this) {
  89                                         contexts.Remove (context);
  90                                 }
  91                                 return (Thread) value;
  92                         }
  93
  94                         ArrayList list = (ArrayList) value;
  95                         Thread result = null;
  96                         if (list.Count > 0) {
  97                                 result = (Thread) list [list.Count - 1];
  98                                 list.RemoveAt (list.Count - 1);
  99                         }
 100
 101                         if (list.Count == 0) {
 102                                 lock (this) {
 103                                         contexts.Remove (context);
 104                                 }
 105                         }
 106
 107                         return result;
 108                 }
 109
 110                 void CheckTimeouts (object state)
 111                 {
 112                         if (contexts.Count == 0) {
 113                                 return;
 114                         }
 115
 116                         DateTime now = DateTime.UtcNow;
 117                         ArrayList clist = new ArrayList ();
 118
 119                         lock (this) { // The lock prevents Keys enumerator from being out of synch
 120                                 clist.AddRange (contexts.Keys);
 121                         }
 122
 123                         foreach (HttpContext context in clist) {
 124                                 if (!context.CheckIfTimeout (now))
 125                                         continue;
 126
 127                                 Thread thread = Remove (context);
 128                                 if (thread != null) // Only if context is removed right after the lock
 129                                         thread.Abort (new StepTimeout ());
 130                         }
 131                 }
 132         }
 133 }
 134