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