mcs/class/System.Web/System.Web/HttpRuntime.cs

   1 //
   2 // System.Web.HttpRuntime.cs
   3 //
   4 // Authors:
   5 //      Miguel de Icaza (miguel@novell.com)
   6 //      Marek Habersack <mhabersack@novell.com>
   7 //
   8 //
   9 // Copyright (C) 2005-2010 Novell, Inc (http://www.novell.com)
  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 //
  32 // TODO: Call HttpRequest.CloseInputStream when we finish a request, as we are using the IntPtr stream.
  33 //
  34 using System.IO;
  35 using System.Text;
  36 using System.Globalization;
  37 using System.Collections;
  38 using System.Reflection;
  39 using System.Security;
  40 using System.Security.Permissions;
  41 using System.Web.Caching;
  42 using System.Web.Configuration;
  43 using System.Web.Management;
  44 using System.Web.UI;
  45 using System.Web.Util;
  46 #if MONOWEB_DEP
  47 using Mono.Web.Util;
  48 #endif
  49 using System.Threading;
  50 #if TARGET_J2EE
  51 using Mainsoft.Web;
  52 #else
  53 using System.CodeDom.Compiler;
  54 using System.Web.Compilation;
  55 #endif
  56
  57 namespace System.Web
  58 {
  59         // CAS - no InheritanceDemand here as the class is sealed
  60         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  61         public sealed class HttpRuntime
  62         {
  63                 static bool domainUnloading;
  64
  65 #if TARGET_J2EE
  66                 static QueueManager queue_manager { get { return _runtime._queue_manager; } }
  67                 static TraceManager trace_manager { get { return _runtime._trace_manager; } }
  68                 static Cache cache { get { return _runtime._cache; } }
  69                 static Cache internalCache { get { return _runtime._internalCache; } }
  70                 static WaitCallback do_RealProcessRequest;
  71
  72                 QueueManager _queue_manager;
  73                 TraceManager _trace_manager;
  74                 Cache _cache;
  75                 Cache _internalCache;
  76
  77                 public HttpRuntime ()
  78                 {
  79                         WebConfigurationManager.Init ();
  80                         _queue_manager = new QueueManager ();
  81                         _trace_manager = new TraceManager ();
  82                         _cache = new Cache ();
  83                         _internalCache = new Cache();
  84                         _internalCache.DependencyCache = _cache;
  85                 }
  86
  87                 static HttpRuntime _runtimeInstance {
  88                         get {
  89                                 HttpRuntime runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  90                                 if (runtime == null)
  91                                         lock (typeof (HttpRuntime)) {
  92                                                 runtime = (HttpRuntime) AppDomain.CurrentDomain.GetData ("HttpRuntime");
  93                                                 if (runtime == null) {
  94                                                         runtime = new HttpRuntime ();
  95                                                         AppDomain.CurrentDomain.SetData ("HttpRuntime", runtime);
  96                                                 }
  97                                         }
  98                                 return runtime;
  99                         }
 100                 }
 101                 static HttpRuntime _runtime
 102                 {
 103                         get
 104                         {
 105                                 if (HttpContext.Current != null)
 106                                         return HttpContext.Current.HttpRuntimeInstance;
 107                                 else
 108                                         return _runtimeInstance;
 109                         }
 110                 }
 111 #else
 112                 static QueueManager queue_manager;
 113                 static TraceManager trace_manager;
 114                 static Cache cache;
 115                 static Cache internalCache;
 116                 static WaitCallback do_RealProcessRequest;
 117                 static Exception initialException;
 118                 static bool firstRun;
 119                 static bool assemblyMappingEnabled;
 120                 static object assemblyMappingLock = new object ();
 121                 static object appOfflineLock = new object ();
 122
 123                 public HttpRuntime ()
 124                 {
 125
 126                 }
 127 #endif
 128
 129                 static HttpRuntime ()
 130                 {
 131 #if !TARGET_J2EE
 132                         firstRun = true;
 133                         try {
 134                                 WebConfigurationManager.Init ();
 135 #if MONOWEB_DEP
 136                                 SettingsMappingManager.Init ();
 137 #endif
 138                         } catch (Exception ex) {
 139                                 initialException = ex;
 140                         }
 141
 142                         // The classes in whose constructors exceptions may be thrown, should be handled the same way QueueManager
 143                         // and TraceManager are below. The constructors themselves MUST NOT throw any exceptions - we MUST be sure
 144                         // the objects are created here. The exceptions will be dealt with below, in RealProcessRequest.
 145                         queue_manager = new QueueManager ();
 146                         if (queue_manager.HasException)
 147                                 initialException = queue_manager.InitialException;
 148
 149                         trace_manager = new TraceManager ();
 150                         if (trace_manager.HasException)
 151                                         initialException = trace_manager.InitialException;
 152
 153                         cache = new Cache ();
 154                         internalCache = new Cache ();
 155                         internalCache.DependencyCache = internalCache;
 156 #endif
 157                         do_RealProcessRequest = new WaitCallback (RealProcessRequest);
 158                 }
 159
 160 #region AppDomain handling
 161                 internal static bool DomainUnloading {
 162                         get { return domainUnloading; }
 163                 }
 164
 165                 //
 166                 // http://radio.weblogs.com/0105476/stories/2002/07/12/executingAspxPagesWithoutAWebServer.html
 167                 //
 168                 public static string AppDomainAppId {
 169                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.High)]
 170                         get {
 171                                 //
 172                                 // This value should not change across invocations
 173                                 //
 174                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".appId");
 175                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 176                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 177                                 }
 178                                 return dirname;
 179                         }
 180                 }
 181
 182                 // Physical directory for the application
 183                 public static string AppDomainAppPath {
 184                         get {
 185                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".appPath");
 186                                 if (SecurityManager.SecurityEnabled) {
 187                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 188                                 }
 189                                 return dirname;
 190                         }
 191                 }
 192
 193                 public static string AppDomainAppVirtualPath {
 194                         get {
 195                                 return (string) AppDomain.CurrentDomain.GetData (".appVPath");
 196                         }
 197                 }
 198
 199                 public static string AppDomainId {
 200                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.High)]
 201                         get {
 202                                 return (string) AppDomain.CurrentDomain.GetData (".domainId");
 203                         }
 204                 }
 205
 206                 public static string AspInstallDirectory {
 207                         get {
 208                                 string dirname = (string) AppDomain.CurrentDomain.GetData (".hostingInstallDir");
 209                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 210                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 211                                 }
 212                                 return dirname;
 213                         }
 214                 }
 215 #endregion
 216
 217                 static string _actual_bin_directory;
 218                 public static string BinDirectory {
 219                         get {
 220                                 if (_actual_bin_directory == null) {
 221                                         string[] parts = AppDomain.CurrentDomain.SetupInformation.PrivateBinPath.Split (';');
 222                                         string mypath = AppDomainAppPath;
 223                                         string tmp;
 224
 225                                         foreach (string p in parts) {
 226                                                 tmp = Path.Combine (mypath, p);
 227                                                 if (Directory.Exists (tmp)) {
 228                                                         _actual_bin_directory = tmp;
 229                                                         break;
 230                                                 }
 231                                         }
 232
 233                                         if (_actual_bin_directory == null)
 234                                                 _actual_bin_directory = Path.Combine (mypath, "bin");
 235
 236                                         if (_actual_bin_directory [_actual_bin_directory.Length - 1] != Path.DirectorySeparatorChar)
 237                                                 _actual_bin_directory += Path.DirectorySeparatorChar;
 238                                 }
 239
 240                                 if (SecurityManager.SecurityEnabled)
 241                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, _actual_bin_directory).Demand ();
 242
 243                                 return _actual_bin_directory;
 244                         }
 245                 }
 246
 247                 public static Cache Cache {
 248                         get {
 249                                 return cache;
 250                         }
 251                 }
 252
 253                 internal static Cache InternalCache {
 254                         get {
 255                                 return internalCache;
 256                         }
 257                 }
 258
 259                 public static string ClrInstallDirectory {
 260                         get {
 261                                 string dirname = Path.GetDirectoryName (typeof (Object).Assembly.Location);
 262                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 263                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 264                                 }
 265                                 return dirname;
 266                         }
 267                 }
 268
 269                 public static string CodegenDir {
 270                         get {
 271                                 string dirname = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 272                                 if (SecurityManager.SecurityEnabled) {
 273                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 274                                 }
 275                                 return dirname;
 276                         }
 277                 }
 278
 279                 public static bool IsOnUNCShare {
 280                         [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Low)]
 281                         get {
 282                                 return RuntimeHelpers.IsUncShare;
 283                         }
 284                 }
 285
 286                 public static string MachineConfigurationDirectory {
 287                         get {
 288                                 string dirname = Path.GetDirectoryName (ICalls.GetMachineConfigPath ());
 289                                 if ((dirname != null) && (dirname.Length > 0) && SecurityManager.SecurityEnabled) {
 290                                         new FileIOPermission (FileIOPermissionAccess.PathDiscovery, dirname).Demand ();
 291                                 }
 292                                 return dirname;
 293                         }
 294                 }
 295
 296
 297                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 298                 public static void Close ()
 299                 {
 300                         // Remove all items from cache.
 301                 }
 302
 303                 internal static HttpWorkerRequest QueuePendingRequest (bool started_internally)
 304                 {
 305                         HttpWorkerRequest next = queue_manager.GetNextRequest (null);
 306                         if (next == null)
 307                                 return null;
 308
 309                         if (!started_internally) {
 310                                 next.StartedInternally = true;
 311                                 ThreadPool.QueueUserWorkItem (do_RealProcessRequest, next);
 312                                 return null;
 313                         }
 314                         return next;
 315                 }
 316
 317 #if !TARGET_J2EE
 318                 static readonly string[] app_offline_files = {"app_offline.htm", "App_Offline.htm", "APP_OFFLINE.HTM"};
 319                 static string app_offline_file;
 320
 321                 static bool AppIsOffline (HttpContext context)
 322                 {
 323                         if (!HttpApplicationFactory.ApplicationDisabled || app_offline_file == null)
 324                                 return false;
 325
 326                         HttpResponse response = context.Response;
 327                         response.Clear ();
 328                         response.ContentType = "text/html";
 329                         response.ExpiresAbsolute = DateTime.UtcNow;
 330                         response.StatusCode = 503;
 331                         response.TransmitFile (app_offline_file, true);
 332
 333                         context.Request.ReleaseResources ();
 334                         context.Response.ReleaseResources ();
 335                         HttpContext.Current = null;
 336                         HttpApplication.requests_total_counter.Increment ();
 337
 338                         return true;
 339                 }
 340
 341                 static void AppOfflineFileRenamed (object sender, RenamedEventArgs args)
 342                 {
 343                         AppOfflineFileChanged (sender, args);
 344                 }
 345
 346                 static void AppOfflineFileChanged (object sender, FileSystemEventArgs args)
 347                 {
 348                         lock (appOfflineLock) {
 349                                 bool offline;
 350
 351                                 switch (args.ChangeType) {
 352                                         case WatcherChangeTypes.Created:
 353                                         case WatcherChangeTypes.Changed:
 354                                                 offline = true;
 355                                                 break;
 356
 357                                         case WatcherChangeTypes.Deleted:
 358                                                 offline = false;
 359                                                 break;
 360
 361                                         case WatcherChangeTypes.Renamed:
 362                                                 RenamedEventArgs rargs = args as RenamedEventArgs;
 363
 364                                                 if (rargs != null &&
 365                                                     String.Compare (rargs.Name, "app_offline.htm", StringComparison.OrdinalIgnoreCase) == 0)
 366                                                         offline = true;
 367                                                 else
 368                                                         offline = false;
 369                                                 break;
 370
 371                                         default:
 372                                                 offline = false;
 373                                                 break;
 374                                 }
 375                                 SetOfflineMode (offline, args.FullPath);
 376                         }
 377                 }
 378
 379                 static void SetOfflineMode (bool offline, string filePath)
 380                 {
 381                         if (!offline) {
 382                                 app_offline_file = null;
 383                                 if (HttpApplicationFactory.ApplicationDisabled)
 384                                         HttpRuntime.UnloadAppDomain ();
 385                         } else {
 386                                 app_offline_file = filePath;
 387                                 HttpApplicationFactory.DisableWatchers ();
 388                                 HttpApplicationFactory.ApplicationDisabled = true;
 389                                 InternalCache.InvokePrivateCallbacks ();
 390                                 HttpApplicationFactory.Dispose ();
 391                         }
 392                 }
 393
 394                 static void SetupOfflineWatch ()
 395                 {
 396                         lock (appOfflineLock) {
 397                                 FileSystemEventHandler seh = new FileSystemEventHandler (AppOfflineFileChanged);
 398                                 RenamedEventHandler reh = new RenamedEventHandler (AppOfflineFileRenamed);
 399
 400                                 string app_dir = AppDomainAppPath;
 401                                 ArrayList watchers = new ArrayList ();
 402                                 FileSystemWatcher watcher;
 403                                 string offlineFile = null, tmp;
 404
 405                                 foreach (string f in app_offline_files) {
 406                                         watcher = new FileSystemWatcher ();
 407                                         watcher.Path = Path.GetDirectoryName (app_dir);
 408                                         watcher.Filter = Path.GetFileName (f);
 409                                         watcher.NotifyFilter |= NotifyFilters.Size;
 410                                         watcher.Deleted += seh;
 411                                         watcher.Changed += seh;
 412                                         watcher.Created += seh;
 413                                         watcher.Renamed += reh;
 414                                         watcher.EnableRaisingEvents = true;
 415
 416                                         watchers.Add (watcher);
 417
 418                                         tmp = Path.Combine (app_dir, f);
 419                                         if (File.Exists (tmp))
 420                                                 offlineFile = tmp;
 421                                 }
 422
 423                                 if (offlineFile != null)
 424                                         SetOfflineMode (true, offlineFile);
 425                         }
 426                 }
 427 #endif
 428
 429                 static void RealProcessRequest (object o)
 430                 {
 431                         HttpWorkerRequest req = (HttpWorkerRequest) o;
 432                         bool started_internally = req.StartedInternally;
 433                         do {
 434                                 Process (req);
 435                                 req = QueuePendingRequest (started_internally);
 436                         } while (started_internally && req != null);
 437                 }
 438
 439                 static void Process (HttpWorkerRequest req)
 440                 {
 441 #if TARGET_J2EE
 442                         HttpContext context = HttpContext.Current;
 443                         if (context == null)
 444                                 context = new HttpContext (req);
 445                         else
 446                                 context.SetWorkerRequest (req);
 447 #else
 448                         HttpContext context = new HttpContext (req);
 449 #endif
 450                         HttpContext.Current = context;
 451                         bool error = false;
 452 #if !TARGET_J2EE
 453                         if (firstRun) {
 454                                 SetupOfflineWatch ();
 455                                 firstRun = false;
 456                                 if (initialException != null) {
 457                                         FinishWithException (req, HttpException.NewWithCode ("Initial exception", initialException, WebEventCodes.RuntimeErrorRequestAbort));
 458                                         error = true;
 459                                 }
 460                         }
 461
 462                         if (AppIsOffline (context))
 463                                 return;
 464 #endif
 465
 466                         //
 467                         // Get application instance (create or reuse an instance of the correct class)
 468                         //
 469                         HttpApplication app = null;
 470                         if (!error) {
 471                                 try {
 472                                         app = HttpApplicationFactory.GetApplication (context);
 473                                 } catch (Exception e) {
 474                                         FinishWithException (req, HttpException.NewWithCode (String.Empty, e, WebEventCodes.RuntimeErrorRequestAbort));
 475                                         error = true;
 476                                 }
 477                         }
 478
 479                         if (error) {
 480                                 context.Request.ReleaseResources ();
 481                                 context.Response.ReleaseResources ();
 482                                 HttpContext.Current = null;
 483                         } else {
 484                                 context.ApplicationInstance = app;
 485
 486                                 //
 487                                 // Ask application to service the request
 488                                 //
 489
 490 #if TARGET_J2EE
 491                                 IHttpAsyncHandler ihah = app;
 492                                 if (context.Handler == null)
 493                                         ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 494                                 else
 495                                         app.Tick ();
 496                                 //ihh.ProcessRequest (context);
 497                                 IHttpExtendedHandler extHandler = context.Handler as IHttpExtendedHandler;
 498                                 if (extHandler != null && !extHandler.IsCompleted)
 499                                         return;
 500                                 if (context.Error is UnifyRequestException)
 501                                         return;
 502
 503                                 ihah.EndProcessRequest (null);
 504 #else
 505                                 IHttpHandler ihh = app;
 506 //                              IAsyncResult appiar = ihah.BeginProcessRequest (context, new AsyncCallback (request_processed), context);
 507 //                              ihah.EndProcessRequest (appiar);
 508                                 ihh.ProcessRequest (context);
 509 #endif
 510
 511                                 HttpApplicationFactory.Recycle (app);
 512                         }
 513                 }
 514
 515                 //
 516                 // ProcessRequest method is executed in the AppDomain of the application
 517                 //
 518                 // Observations:
 519                 //    ProcessRequest does not guarantee that `wr' will be processed synchronously,
 520                 //    the request can be queued and processed later.
 521                 //
 522                 [AspNetHostingPermission (SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Medium)]
 523                 public static void ProcessRequest (HttpWorkerRequest wr)
 524                 {
 525                         if (wr == null)
 526                                 throw new ArgumentNullException ("wr");
 527                         //
 528                         // Queue our request, fetch the next available one from the queue
 529                         //
 530                         HttpWorkerRequest request = queue_manager.GetNextRequest (wr);
 531                         if (request == null)
 532                                 return;
 533
 534                         QueuePendingRequest (false);
 535                         RealProcessRequest (request);
 536                 }
 537
 538 #if TARGET_J2EE
 539                 //
 540                 // Callback to be invoked by IHttpAsyncHandler.BeginProcessRequest
 541                 //
 542                 static void request_processed (IAsyncResult iar)
 543                 {
 544                         HttpContext context = (HttpContext) iar.AsyncState;
 545
 546                         context.Request.ReleaseResources ();
 547                         context.Response.ReleaseResources ();
 548                 }
 549 #endif
 550
 551 #if TARGET_JVM
 552                 [MonoNotSupported ("UnloadAppDomain is not supported")]
 553                 public static void UnloadAppDomain ()
 554                 {
 555                         throw new NotImplementedException ("UnloadAppDomain is not supported");
 556                 }
 557 #else
 558                 //
 559                 // Called when we are shutting down or we need to reload an application
 560                 // that has been modified (touch global.asax)
 561                 //
 562                 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
 563                 public static void UnloadAppDomain ()
 564                 {
 565                         //
 566                         // TODO: call ReleaseResources
 567                         //
 568                         domainUnloading = true;
 569                         ThreadPool.QueueUserWorkItem (new WaitCallback (ShutdownAppDomain), null);
 570                 }
 571 #endif
 572                 //
 573                 // Shuts down the AppDomain
 574                 //
 575                 static void ShutdownAppDomain (object args)
 576                 {
 577                         queue_manager.Dispose ();
 578                         // This will call Session_End if needed.
 579                         InternalCache.InvokePrivateCallbacks ();
 580                         // Kill our application.
 581                         HttpApplicationFactory.Dispose ();
 582                         ThreadPool.QueueUserWorkItem (new WaitCallback (DoUnload), null);
 583                 }
 584
 585                 static void DoUnload (object state)
 586                 {
 587 #if TARGET_J2EE
 588                         // No unload support for appdomains under Grasshopper
 589 #else
 590                         AppDomain.Unload (AppDomain.CurrentDomain);
 591 #endif
 592                 }
 593
 594                 static string content503 = "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n" +
 595                         "<html><head>\n<title>503 Server Unavailable</title>\n</head><body>\n" +
 596                         "<h1>Server Unavailable</h1>\n" +
 597                         "</body></html>\n";
 598
 599                 static void FinishWithException (HttpWorkerRequest wr, HttpException e)
 600                 {
 601                         int code = e.GetHttpCode ();
 602                         wr.SendStatus (code, HttpWorkerRequest.GetStatusDescription (code));
 603                         wr.SendUnknownResponseHeader ("Connection", "close");
 604                         Encoding enc = Encoding.ASCII;
 605                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 606                         string msg = e.GetHtmlErrorMessage ();
 607                         byte [] contentBytes = enc.GetBytes (msg);
 608                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 609                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 610                         wr.FlushResponse (true);
 611                         wr.CloseConnection ();
 612                         HttpApplication.requests_total_counter.Increment ();
 613                 }
 614
 615                 //
 616                 // This is called from the QueueManager if a request
 617                 // can not be processed (load, no resources, or
 618                 // appdomain unload).
 619                 //
 620                 static internal void FinishUnavailable (HttpWorkerRequest wr)
 621                 {
 622                         wr.SendStatus (503, "Service unavailable");
 623                         wr.SendUnknownResponseHeader ("Connection", "close");
 624                         Encoding enc = Encoding.ASCII;
 625                         wr.SendUnknownResponseHeader ("Content-Type", "text/html; charset=" + enc.WebName);
 626                         byte [] contentBytes = enc.GetBytes (content503);
 627                         wr.SendUnknownResponseHeader ("Content-Length", contentBytes.Length.ToString ());
 628                         wr.SendResponseFromMemory (contentBytes, contentBytes.Length);
 629                         wr.FlushResponse (true);
 630                         wr.CloseConnection ();
 631                         HttpApplication.requests_total_counter.Increment ();
 632                 }
 633
 634 #if !TARGET_J2EE
 635                 static internal void WritePreservationFile (Assembly asm, string genericNameBase)
 636                 {
 637                         if (asm == null)
 638                                 throw new ArgumentNullException ("asm");
 639                         if (String.IsNullOrEmpty (genericNameBase))
 640                                 throw new ArgumentNullException ("genericNameBase");
 641
 642                         string compiled = Path.Combine (AppDomain.CurrentDomain.SetupInformation.DynamicBase,
 643                                                         genericNameBase + ".compiled");
 644                         PreservationFile pf = new PreservationFile ();
 645                         try {
 646                                 pf.VirtualPath = String.Concat ("/", genericNameBase, "/");
 647
 648                                 AssemblyName an = asm.GetName ();
 649                                 pf.Assembly = an.Name;
 650                                 pf.ResultType = BuildResultTypeCode.TopLevelAssembly;
 651                                 pf.Save (compiled);
 652                         } catch (Exception ex) {
 653                                 throw new HttpException (
 654                                         String.Format ("Failed to write preservation file {0}", genericNameBase + ".compiled"),
 655                                         ex);
 656                         }
 657                 }
 658
 659                 static Assembly ResolveAssemblyHandler(object sender, ResolveEventArgs e)
 660                 {
 661                         AssemblyName an = new AssemblyName (e.Name);
 662                         string dynamic_base = AppDomain.CurrentDomain.SetupInformation.DynamicBase;
 663                         string compiled = Path.Combine (dynamic_base, an.Name + ".compiled");
 664
 665                         if (!File.Exists (compiled))
 666                                 return null;
 667
 668                         PreservationFile pf;
 669                         try {
 670                                 pf = new PreservationFile (compiled);
 671                         } catch (Exception ex) {
 672                                 throw new HttpException (
 673                                         String.Format ("Failed to read preservation file {0}", an.Name + ".compiled"),
 674                                         ex);
 675                         }
 676
 677                         Assembly ret = null;
 678                         try {
 679                                 string asmPath = Path.Combine (dynamic_base, pf.Assembly + ".dll");
 680                                 ret = Assembly.LoadFrom (asmPath);
 681                         } catch (Exception) {
 682                                 // ignore
 683                         }
 684
 685                         return ret;
 686                 }
 687
 688                 internal static void EnableAssemblyMapping (bool enable)
 689                 {
 690                         lock (assemblyMappingLock) {
 691                                 if (assemblyMappingEnabled == enable)
 692                                         return;
 693                                 if (enable)
 694                                         AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler (ResolveAssemblyHandler);
 695                                 else
 696                                         AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler (ResolveAssemblyHandler);
 697                                 assemblyMappingEnabled = enable;
 698                         }
 699                 }
 700 #endif // #if !TARGET_J2EE
 701
 702                 internal static TraceManager TraceManager {
 703                         get {
 704                                 return trace_manager;
 705                         }
 706                 }
 707         }
 708 }