mcs/class/System.Web/System.Web/HttpApplicationFactory.cs

   1 //
   2 // System.Web.HttpApplicationFactory
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (c) 2002,2003 Ximian, Inc. (http://www.ximian.com)
   8 // (c) Copyright 2004-2009 Novell, Inc. (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29 using System;
  30 using System.Collections;
  31 using System.Globalization;
  32 using System.IO;
  33 using System.Reflection;
  34 using System.Web.UI;
  35 using System.Web.SessionState;
  36 using System.Web.Configuration;
  37 using System.Threading;
  38 using System.Web.Util;
  39
  40 using System.Web.Compilation;
  41 #if TARGET_J2EE
  42 using vmw.common;
  43 #else
  44 using System.CodeDom.Compiler;
  45 #endif
  46
  47 namespace System.Web
  48 {
  49         sealed class HttpApplicationFactory
  50         {
  51                 object this_lock = new object ();
  52
  53                 // Initialized in InitType
  54 #if TARGET_J2EE
  55                 static HttpApplicationFactory theFactory {
  56                         get
  57                         {
  58                                 HttpApplicationFactory factory = (HttpApplicationFactory)AppDomain.CurrentDomain.GetData("HttpApplicationFactory");
  59                                 if (factory == null) {
  60                                         lock(typeof(HttpApplicationFactory)) {
  61                                                 factory = (HttpApplicationFactory)AppDomain.CurrentDomain.GetData("HttpApplicationFactory");
  62                                                 if (factory == null) {
  63                                                         factory = new HttpApplicationFactory();
  64                                                         System.Threading.Thread.Sleep(1);
  65                                                         AppDomain.CurrentDomain.SetData("HttpApplicationFactory", factory);
  66                                                 }
  67                                         }
  68                                 }
  69                                 return factory;
  70                         }
  71                 }
  72 #else
  73                 static HttpApplicationFactory theFactory = new HttpApplicationFactory();
  74 #endif
  75                 object session_end; // This is a MethodInfo
  76                 bool needs_init = true;
  77                 bool app_start_needed = true;
  78                 bool have_app_events;
  79                 Type app_type;
  80                 HttpApplicationState app_state;
  81                 Hashtable app_event_handlers;
  82                 static ArrayList watchers = new ArrayList();
  83                 static object watchers_lock = new object();
  84                 static bool app_shutdown = false;
  85                 static bool app_disabled = false;
  86                 static string[] app_browsers_files = new string[0];
  87                 static string[] default_machine_browsers_files = new string[0];
  88                 static string[] app_mono_machine_browsers_files = new string[0];
  89                 Stack available = new Stack ();
  90                 object next_free;
  91                 Stack available_for_end = new Stack ();
  92
  93                 bool IsEventHandler (MethodInfo m)
  94                 {
  95                         int pos = m.Name.IndexOf ('_');
  96                         if (pos == -1 || (m.Name.Length - 1) <= pos)
  97                                 return false;
  98
  99                         if (m.ReturnType != typeof (void))
 100                                 return false;
 101
 102                         ParameterInfo [] pi = m.GetParameters ();
 103                         int length = pi.Length;
 104                         if (length == 0)
 105                                 return true;
 106
 107                         if (length != 2)
 108                                 return false;
 109
 110                         if (pi [0].ParameterType != typeof (object) ||
 111                             !typeof (EventArgs).IsAssignableFrom (pi [1].ParameterType))
 112                                 return false;
 113
 114                         return true;
 115                 }
 116
 117                 void AddEvent (MethodInfo method, Hashtable appTypeEventHandlers)
 118                 {
 119                         string name = method.Name.Replace ("_On", "_");
 120                         if (appTypeEventHandlers [name] == null) {
 121                                 appTypeEventHandlers [name] = method;
 122                                 return;
 123                         }
 124
 125                         MethodInfo old_method = appTypeEventHandlers [name] as MethodInfo;
 126                         ArrayList list;
 127                         if (old_method != null){
 128                                 list = new ArrayList (4);
 129                                 list.Add (old_method);
 130                                 appTypeEventHandlers [name] = list;
 131                         } else
 132                                 list = appTypeEventHandlers [name] as ArrayList;
 133
 134                         list.Add (method);
 135                 }
 136
 137                 ArrayList GetMethodsDeep (Type type)
 138                 {
 139                         ArrayList al = new ArrayList ();
 140                         MethodInfo[] methods = type.GetMethods (BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance  | BindingFlags.Static | BindingFlags.FlattenHierarchy);
 141                         al.AddRange (methods);
 142
 143                         Type t = type.BaseType;
 144                         while (t != null) {
 145                                 methods = t.GetMethods (BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
 146                                 al.AddRange (methods);
 147                                 t = t.BaseType;
 148                         }
 149
 150                         return al;
 151                 }
 152
 153                 Hashtable GetApplicationTypeEvents (Type type)
 154                 {
 155                         if (have_app_events)
 156                                 return app_event_handlers;
 157
 158                         lock (this_lock) {
 159                                 if (app_event_handlers != null)
 160                                         return app_event_handlers;
 161
 162                                 app_event_handlers = new Hashtable ();
 163                                 ArrayList methods = GetMethodsDeep (type);
 164                                 Hashtable used = null;
 165                                 MethodInfo m;
 166                                 string mname;
 167
 168                                 foreach (object o in methods) {
 169                                         m = o as MethodInfo;
 170                                         if (m.DeclaringType != typeof (HttpApplication) && IsEventHandler (m)) {
 171                                                 mname = m.ToString ();
 172                                                 if (used == null)
 173                                                         used = new Hashtable ();
 174                                                 else if (used.ContainsKey (mname))
 175                                                         continue;
 176                                                 used.Add (mname, m);
 177                                                 AddEvent (m, app_event_handlers);
 178                                         }
 179                                 }
 180                                 used = null;
 181                                 have_app_events = true;
 182                         }
 183
 184                         return app_event_handlers;
 185                 }
 186
 187                 Hashtable GetApplicationTypeEvents (HttpApplication app)
 188                 {
 189                         if (have_app_events)
 190                                 return app_event_handlers;
 191
 192                         return GetApplicationTypeEvents (app.GetType ());
 193                 }
 194
 195                 bool FireEvent (string method_name, object target, object [] args)
 196                 {
 197                         Hashtable possibleEvents = GetApplicationTypeEvents ((HttpApplication) target);
 198                         MethodInfo method = possibleEvents [method_name] as MethodInfo;
 199                         if (method == null)
 200                                 return false;
 201
 202                         if (method.GetParameters ().Length == 0)
 203                                 args = null;
 204
 205                         method.Invoke (target, args);
 206
 207                         return true;
 208                 }
 209
 210                 HttpApplication FireOnAppStart (HttpContext context)
 211                 {
 212                         HttpApplication app = (HttpApplication) Activator.CreateInstance (app_type, true);
 213                         context.ApplicationInstance = app;
 214                         app.SetContext (context);
 215                         object [] args = new object [] {app, EventArgs.Empty};
 216                         app.InApplicationStart = true;
 217                         FireEvent ("Application_Start", app, args);
 218                         app.InApplicationStart = false;
 219                         return app;
 220                 }
 221
 222                 void FireOnAppEnd ()
 223                 {
 224                         if (app_type == null)
 225                                 return; // we didn't even get an application
 226
 227                         HttpApplication app = (HttpApplication) Activator.CreateInstance (app_type, true);
 228                         FireEvent ("Application_End", app, new object [] {new object (), EventArgs.Empty});
 229                         app.DisposeInternal ();
 230                         app_type = null;
 231                 }
 232
 233                 //
 234                 // This is invoked by HttpRuntime.Dispose, when we unload an AppDomain
 235                 // To reproduce this in action, touch "global.asax" while XSP is running.
 236                 //
 237                 public static void Dispose ()
 238                 {
 239                         theFactory.FireOnAppEnd ();
 240                 }
 241
 242                 static FileSystemWatcher CreateWatcher (string file, FileSystemEventHandler hnd, RenamedEventHandler reh)
 243                 {
 244                         FileSystemWatcher watcher = new FileSystemWatcher ();
 245
 246                         watcher.Path = Path.GetFullPath (Path.GetDirectoryName (file));
 247                         watcher.Filter = Path.GetFileName (file);
 248
 249                         // This will enable the Modify flag for Linux/inotify
 250                         watcher.NotifyFilter |= NotifyFilters.Size;
 251
 252                         watcher.Changed += hnd;
 253                         watcher.Created += hnd;
 254                         watcher.Deleted += hnd;
 255                         watcher.Renamed += reh;
 256
 257                         watcher.EnableRaisingEvents = true;
 258
 259                         return watcher;
 260                 }
 261
 262                 internal static void AttachEvents (HttpApplication app)
 263                 {
 264                         HttpApplicationFactory factory = theFactory;
 265                         Hashtable possibleEvents = factory.GetApplicationTypeEvents (app);
 266                         foreach (string key in possibleEvents.Keys) {
 267                                 int pos = key.IndexOf ('_');
 268                                 string moduleName = key.Substring (0, pos);
 269                                 object target;
 270                                 if (moduleName == "Application") {
 271                                         target = app;
 272                                 } else {
 273                                         target = app.Modules [moduleName];
 274                                         if (target == null)
 275                                                 continue;
 276                                 }
 277
 278                                 string eventName = key.Substring (pos + 1);
 279                                 EventInfo evt = target.GetType ().GetEvent (eventName);
 280                                 if (evt == null)
 281                                         continue;
 282
 283                                 string usualName = moduleName + "_" + eventName;
 284                                 object methodData = possibleEvents [usualName];
 285                                 if (methodData == null)
 286                                         continue;
 287
 288                                 if (eventName == "End" && moduleName == "Session") {
 289                                         Interlocked.CompareExchange (ref factory.session_end, methodData, null);
 290                                         continue;
 291                                 }
 292
 293                                 if (methodData is MethodInfo) {
 294                                         factory.AddHandler (evt, target, app, (MethodInfo) methodData);
 295                                         continue;
 296                                 }
 297
 298                                 ArrayList list = (ArrayList) methodData;
 299                                 foreach (MethodInfo method in list)
 300                                         factory.AddHandler (evt, target, app, method);
 301                         }
 302                 }
 303
 304                 void AddHandler (EventInfo evt, object target, HttpApplication app, MethodInfo method)
 305                 {
 306                         int length = method.GetParameters ().Length;
 307
 308                         if (length == 0) {
 309                                 NoParamsInvoker npi = new NoParamsInvoker (app, method);
 310                                 evt.AddEventHandler (target, npi.FakeDelegate);
 311                         } else {
 312                                 if (method.IsStatic) {
 313                                         evt.AddEventHandler (target, Delegate.CreateDelegate (
 314                                                 evt.EventHandlerType, method));
 315                                 } else {
 316                                         evt.AddEventHandler (target, Delegate.CreateDelegate (
 317                                                                      evt.EventHandlerType, app,
 318                                                                      method));
 319                                 }
 320                         }
 321
 322                 }
 323
 324                 internal static void InvokeSessionEnd (object state)
 325                 {
 326                         InvokeSessionEnd (state, null, EventArgs.Empty);
 327                 }
 328
 329                 internal static void InvokeSessionEnd (object state, object source, EventArgs e)
 330                 {
 331                         HttpApplicationFactory factory = theFactory;
 332                         MethodInfo method = null;
 333                         HttpApplication app = null;
 334                         lock (factory.available_for_end) {
 335                                 method = (MethodInfo) factory.session_end;
 336                                 if (method == null)
 337                                         return;
 338
 339                                 app = GetApplicationForSessionEnd ();
 340                         }
 341
 342                         app.SetSession ((HttpSessionState) state);
 343                         try {
 344                                 method.Invoke (app, new object [] {(source == null ? app : source), e});
 345                         } catch (Exception) {
 346                                 // Ignore
 347                         }
 348                         RecycleForSessionEnd (app);
 349                 }
 350
 351                 static HttpStaticObjectsCollection MakeStaticCollection (ArrayList list)
 352                 {
 353                         if (list == null || list.Count == 0)
 354                                 return null;
 355
 356                         HttpStaticObjectsCollection coll = new HttpStaticObjectsCollection ();
 357                         foreach (ObjectTagBuilder tag in list) {
 358                                 coll.Add (tag);
 359                         }
 360
 361                         return coll;
 362                 }
 363
 364                 internal static HttpApplicationState ApplicationState {
 365 #if TARGET_J2EE
 366                         get {
 367                                 HttpApplicationFactory factory = theFactory;
 368                                 if (factory.app_state == null)
 369                                         factory.app_state = new HttpApplicationState (null, null);
 370                                 return factory.app_state;
 371                         }
 372 #else
 373                         get {
 374                                 if (theFactory.app_state == null) {
 375                                         HttpStaticObjectsCollection app = MakeStaticCollection (GlobalAsaxCompiler.ApplicationObjects);
 376                                         HttpStaticObjectsCollection ses = MakeStaticCollection (GlobalAsaxCompiler.SessionObjects);
 377
 378                                         theFactory.app_state = new HttpApplicationState (app, ses);
 379                                 }
 380                                 return theFactory.app_state;
 381                         }
 382 #endif
 383                 }
 384
 385                 internal static Type AppType {
 386                         get {
 387                                 return theFactory.app_type;
 388                         }
 389                 }
 390
 391                 void InitType (HttpContext context)
 392                 {
 393                         lock (this_lock) {
 394                                 if (!needs_init)
 395                                         return;
 396
 397                                 try {
 398                                         string physical_app_path = HttpRuntime.AppDomainAppPath;
 399                                         string app_file = null;
 400
 401                                         app_file = Path.Combine (physical_app_path, "Global.asax");
 402                                         if (!File.Exists (app_file)) {
 403                                                 app_file = Path.Combine (physical_app_path, "global.asax");
 404                                                 if (!File.Exists (app_file))
 405                                                         app_file = null;
 406                                         }
 407 #if NET_4_0
 408                                         BuildManager.CallPreStartMethods ();
 409                                         BuildManager.CompilingTopLevelAssemblies = true;
 410 #endif
 411 #if !TARGET_J2EE
 412                                         AppResourcesCompiler ac = new AppResourcesCompiler (context);
 413                                         ac.Compile ();
 414
 415 #if WEBSERVICES_DEP
 416                                         AppWebReferencesCompiler awrc = new AppWebReferencesCompiler ();
 417                                         awrc.Compile ();
 418 #endif
 419                                         // Todo: Generate profile properties assembly from Web.config here
 420
 421                                         AppCodeCompiler acc = new AppCodeCompiler ();
 422                                         acc.Compile ();
 423
 424                                         BuildManager.AllowReferencedAssembliesCaching = true;
 425
 426                                         // Get the default machine *.browser files.
 427                                         string default_machine_browsers_path = Path.Combine (HttpRuntime.MachineConfigurationDirectory, "Browsers");
 428                                         default_machine_browsers_files = new string[0];
 429                                         if (Directory.Exists (default_machine_browsers_path)) {
 430                                                 default_machine_browsers_files
 431                                                         = Directory.GetFiles (default_machine_browsers_path, "*.browser");
 432                                         }
 433
 434                                         // Note whether there are any App_Data/Mono_Machine_Browsers/*.browser files.  If there
 435                                         // are we will be using them instead of the default machine *.browser files.
 436                                         string app_mono_machine_browsers_path = Path.Combine (Path.Combine (physical_app_path, "App_Data"), "Mono_Machine_Browsers");
 437                                         app_mono_machine_browsers_files = new string[0];
 438                                         if (Directory.Exists (app_mono_machine_browsers_path)) {
 439                                                 app_mono_machine_browsers_files
 440                                                         = Directory.GetFiles (app_mono_machine_browsers_path, "*.browser");
 441                                         }
 442
 443                                         // Note whether there are any App_Browsers/*.browser files.  If there
 444                                         // are we will be using *.browser files for sniffing in addition to browscap.ini
 445                                         string app_browsers_path = Path.Combine (physical_app_path, "App_Browsers");
 446                                         app_browsers_files = new string[0];
 447                                         if (Directory.Exists (app_browsers_path)) {
 448                                                 app_browsers_files = Directory.GetFiles (app_browsers_path, "*.browser");
 449                                         }
 450 #endif
 451 #if NET_4_0
 452                                         BuildManager.CompilingTopLevelAssemblies = false;
 453 #endif
 454                                         app_type = BuildManager.GetPrecompiledApplicationType ();
 455                                         if (app_type == null && app_file != null) {
 456 #if TARGET_J2EE
 457                                                 app_file = System.Web.Util.UrlUtils.ResolveVirtualPathFromAppAbsolute("~/" + Path.GetFileName(app_file));
 458                                                 app_type = System.Web.J2EE.PageMapper.GetObjectType(context, app_file);
 459 #else
 460                                                 app_type = BuildManager.GetCompiledType ("~/" + Path.GetFileName (app_file));
 461 #endif
 462                                                 if (app_type == null) {
 463                                                         string msg = String.Format ("Error compiling application file ({0}).", app_file);
 464                                                         throw new ApplicationException (msg);
 465                                                 }
 466                                         } else if (app_type == null) {
 467                                                 app_type = typeof (System.Web.HttpApplication);
 468                                                 app_state = new HttpApplicationState ();
 469                                         }
 470
 471                                         WatchLocationForRestart ("?lobal.asax");
 472 #if CODE_DISABLED_UNTIL_SYSTEM_CONFIGURATION_IS_FIXED
 473                                         // This is the correct behavior, but until
 474                                         // System.Configuration is fixed to properly reload
 475                                         // configuration when it is modified on disk, we need to use
 476                                         // the recursive watchers below.
 477                                         WatchLocationForRestart ("?eb.?onfig");
 478 #else
 479                                         // This is to avoid startup delays. Inotify/FAM code looks
 480                                         // recursively for all subdirectories and adds them to the
 481                                         // watch set. This can take a lot of time for deep directory
 482                                         // trees (see bug #490497)
 483                                         ThreadPool.QueueUserWorkItem (delegate {
 484                                                 try {
 485                                                         WatchLocationForRestart (String.Empty, "?eb.?onfig", true);
 486                                                 } catch (Exception e) {
 487                                                         Console.Error.WriteLine (e);
 488                                                 } }, null);
 489 #endif
 490
 491                                         needs_init = false;
 492                                 } catch (Exception) {
 493                                         if (BuildManager.CodeAssemblies != null)
 494                                                 BuildManager.CodeAssemblies.Clear ();
 495                                         if (BuildManager.TopLevelAssemblies != null)
 496                                                 BuildManager.TopLevelAssemblies.Clear ();
 497                                         if (WebConfigurationManager.ExtraAssemblies != null)
 498                                                 WebConfigurationManager.ExtraAssemblies.Clear ();
 499                                         throw;
 500                                 }
 501                         }
 502                 }
 503
 504                 //
 505                 // Multiple-threads might hit this one on startup, and we have
 506                 // to delay-initialize until we have the HttpContext
 507                 //
 508                 internal static HttpApplication GetApplication (HttpContext context)
 509                 {
 510 #if TARGET_J2EE
 511                         if (context.ApplicationInstance!=null)
 512                                 return context.ApplicationInstance;
 513 #endif
 514                         HttpApplicationFactory factory = theFactory;
 515                         HttpApplication app = null;
 516                         if (factory.app_start_needed){
 517                                 if (context == null)
 518                                         return null;
 519
 520                                 factory.InitType (context);
 521                                 lock (factory) {
 522                                         if (factory.app_start_needed) {
 523                                                 foreach (string dir in HttpApplication.BinDirs)
 524                                                         WatchLocationForRestart (dir, "*.dll");
 525                                                 // Restart if the App_* directories are created...
 526                                                 WatchLocationForRestart (".", "App_Code");
 527                                                 WatchLocationForRestart (".", "App_Browsers");
 528                                                 WatchLocationForRestart (".", "App_GlobalResources");
 529                                                 // ...or their contents is changed.
 530                                                 WatchLocationForRestart ("App_Code", "*", true);
 531                                                 WatchLocationForRestart ("App_Browsers", "*");
 532                                                 WatchLocationForRestart ("App_GlobalResources", "*");
 533                                                 app = factory.FireOnAppStart (context);
 534                                                 factory.app_start_needed = false;
 535                                                 return app;
 536                                         }
 537                                 }
 538                         }
 539
 540                         app = (HttpApplication) Interlocked.Exchange (ref factory.next_free, null);
 541                         if (app != null) {
 542                                 app.RequestCompleted = false;
 543                                 return app;
 544                         }
 545
 546                         lock (factory.available) {
 547                                 if (factory.available.Count > 0) {
 548                                         app = (HttpApplication) factory.available.Pop ();
 549                                         app.RequestCompleted = false;
 550                                         return app;
 551                                 }
 552                         }
 553
 554                         return (HttpApplication) Activator.CreateInstance (factory.app_type, true);
 555                 }
 556
 557                 // The lock is in InvokeSessionEnd
 558                 static HttpApplication GetApplicationForSessionEnd ()
 559                 {
 560                         HttpApplicationFactory factory = theFactory;
 561                         if (factory.available_for_end.Count > 0)
 562                                 return (HttpApplication) factory.available_for_end.Pop ();
 563
 564                         HttpApplication app = (HttpApplication) Activator.CreateInstance (factory.app_type, true);
 565                         app.InitOnce (false);
 566
 567                         return app;
 568                 }
 569
 570                 internal static void RecycleForSessionEnd (HttpApplication app)
 571                 {
 572                         bool dispose = false;
 573                         HttpApplicationFactory factory = theFactory;
 574                         lock (factory.available_for_end) {
 575                                 if (factory.available_for_end.Count < 64)
 576                                         factory.available_for_end.Push (app);
 577                                 else
 578                                         dispose = true;
 579                         }
 580                         if (dispose)
 581                                 app.Dispose ();
 582                 }
 583
 584                 internal static void Recycle (HttpApplication app)
 585                 {
 586                         bool dispose = false;
 587                         HttpApplicationFactory factory = theFactory;
 588                         if (Interlocked.CompareExchange (ref factory.next_free, app, null) == null)
 589                                 return;
 590
 591                         lock (factory.available) {
 592                                 if (factory.available.Count < 64)
 593                                         factory.available.Push (app);
 594                                 else
 595                                         dispose = true;
 596                         }
 597                         if (dispose)
 598                                 app.Dispose ();
 599                 }
 600
 601                 internal static bool ContextAvailable {
 602                         get { return theFactory != null && !theFactory.app_start_needed; }
 603                 }
 604
 605
 606                 internal static bool WatchLocationForRestart (string filter)
 607                 {
 608                         return WatchLocationForRestart (String.Empty, filter, false);
 609                 }
 610
 611                 internal static bool WatchLocationForRestart (string virtualPath, string filter)
 612                 {
 613                         return WatchLocationForRestart (virtualPath, filter, false);
 614                 }
 615
 616                 internal static bool WatchLocationForRestart(string virtualPath, string filter, bool watchSubdirs)
 617                 {
 618                         // map the path to the physical one
 619                         string physicalPath = HttpRuntime.AppDomainAppPath;
 620                         physicalPath = Path.Combine(physicalPath, virtualPath);
 621                         bool isDir = Directory.Exists(physicalPath);
 622                         bool isFile = isDir ? false : File.Exists(physicalPath);
 623
 624                         if (isDir || isFile) {
 625                                 // create the watcher
 626                                 FileSystemEventHandler fseh = new FileSystemEventHandler(OnFileChanged);
 627                                 RenamedEventHandler reh = new RenamedEventHandler(OnFileRenamed);
 628                                 FileSystemWatcher watcher = CreateWatcher(Path.Combine(physicalPath, filter), fseh, reh);
 629                                 if (isDir)
 630                                         watcher.IncludeSubdirectories = watchSubdirs;
 631
 632                                 lock (watchers_lock) {
 633                                         watchers.Add(watcher);
 634                                 }
 635                                 return true;
 636                         } else {
 637                                 return false;
 638                         }
 639                 }
 640
 641                 internal static bool ApplicationDisabled {
 642                         get { return app_disabled; }
 643                         set { app_disabled = value; }
 644                 }
 645
 646                 internal static string[] AppBrowsersFiles {
 647                         get { return app_browsers_files; }
 648                 }
 649
 650                 static System.Web.Configuration.nBrowser.Build capabilities_processor = null;
 651                 static object capabilities_processor_lock = new object();
 652                 internal static System.Web.Configuration.ICapabilitiesProcess CapabilitiesProcessor {
 653                         get {
 654                                 lock (capabilities_processor_lock) {
 655                                         if (capabilities_processor == null) {
 656                                                 capabilities_processor = new System.Web.Configuration.nBrowser.Build();
 657                                                 string[] machine_browsers_files = app_mono_machine_browsers_files;
 658                                                 if (machine_browsers_files.Length == 0) {
 659                                                         machine_browsers_files = default_machine_browsers_files;
 660                                                 }
 661                                                 foreach (string f in machine_browsers_files) {
 662                                                         capabilities_processor.AddBrowserFile(f);
 663                                                 }
 664                                                 foreach (string f in app_browsers_files) {
 665                                                         capabilities_processor.AddBrowserFile(f);
 666                                                 }
 667                                         }
 668                                 }
 669                                 return capabilities_processor;
 670                         }
 671                 }
 672
 673                 internal static void DisableWatchers ()
 674                 {
 675                         lock (watchers_lock) {
 676                                 foreach (FileSystemWatcher watcher in watchers)
 677                                         watcher.EnableRaisingEvents = false;
 678                         }
 679                 }
 680
 681                 internal static void DisableWatcher (string virtualPath, string filter)
 682                 {
 683                         EnableWatcherEvents (virtualPath, filter, false);
 684                 }
 685
 686                 internal static void EnableWatcher (string virtualPath, string filter)
 687                 {
 688                         EnableWatcherEvents (virtualPath, filter, true);
 689                 }
 690
 691                 static void EnableWatcherEvents (string virtualPath, string filter, bool enable)
 692                 {
 693                         lock (watchers_lock) {
 694                                 foreach (FileSystemWatcher watcher in watchers) {
 695                                         if (String.Compare (watcher.Path, virtualPath, StringComparison.Ordinal) != 0 || String.Compare (watcher.Filter, filter, StringComparison.Ordinal) != 0)
 696                                                 continue;
 697
 698                                         watcher.EnableRaisingEvents = enable;
 699                                 }
 700                         }
 701                 }
 702
 703                 internal static void EnableWatchers ()
 704                 {
 705                         lock (watchers_lock) {
 706                                 foreach (FileSystemWatcher watcher in watchers)
 707                                         watcher.EnableRaisingEvents = true;
 708                         }
 709                 }
 710
 711                 static void OnFileRenamed(object sender, RenamedEventArgs args)
 712                 {
 713                         OnFileChanged(sender, args);
 714                 }
 715
 716                 static void OnFileChanged(object sender, FileSystemEventArgs args)
 717                 {
 718                         if (HttpRuntime.DomainUnloading)
 719                                 return;
 720                         string name = args.Name;
 721                         bool isConfig = false;
 722
 723                         if (StrUtils.EndsWith (name, "onfig", true)) {
 724                                 if (String.Compare (Path.GetFileName (name), "web.config", true, Helpers.InvariantCulture) != 0)
 725                                         return;
 726                                 isConfig = true;
 727                         } else if (StrUtils.EndsWith (name, "lobal.asax", true) && String.Compare (name, "global.asax", true, Helpers.InvariantCulture) != 0)
 728                                 return;
 729
 730                         Console.WriteLine ("Change: " + name);
 731
 732                         // {Inotify,FAM}Watcher will notify about events for a directory regardless
 733                         // of the filter pattern. This might be a bug in the watchers code, but
 734                         // since I couldn't find any rationale for the code in there I'd opted for
 735                         // not removing it and instead working around the issue here. Fix for bug
 736                         // #495011
 737                         FileSystemWatcher watcher = sender as FileSystemWatcher;
 738                         if (watcher != null && String.Compare (watcher.Filter, "?eb.?onfig", true, Helpers.InvariantCulture) == 0 && Directory.Exists (name))
 739                                 return;
 740
 741                         // We re-enable suppression here since WebConfigurationManager will disable
 742                         // it after save is done. WebConfigurationManager is called twice by
 743                         // Configuration - just after opening the target file and just after closing
 744                         // it. For that reason we will receive two change notifications and if we
 745                         // disabled suppression here, it would reload the application on the second
 746                         // change notification.
 747                         if (isConfig && WebConfigurationManager.SuppressAppReload (true))
 748                                 return;
 749
 750                         lock (watchers_lock) {
 751                                 if(app_shutdown)
 752                                         return;
 753                                 app_shutdown = true;
 754
 755                                 // Disable event raising to avoid concurrent restarts
 756                                 DisableWatchers ();
 757
 758                                 // Restart application
 759                                 HttpRuntime.UnloadAppDomain();
 760                         }
 761                 }
 762         }
 763 }
 764