mcs/class/System.Web/System.Web.Configuration_2.0/WebConfigurationManager.cs

   1 //
   2 // System.Web.Configuration.WebConfigurationManager.cs
   3 //
   4 // Authors:
   5 //      Lluis Sanchez Gual (lluis@novell.com)
   6 //      Chris Toshok (toshok@ximian.com)
   7 //      Marek Habersack <mhabersack@novell.com>
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 // Copyright (C) 2005-2009 Novell, Inc (http://www.novell.com)
  29 //
  30
  31
  32 using System;
  33 using System.IO;
  34 using System.Collections;
  35 using System.Collections.Generic;
  36 using System.Collections.Specialized;
  37 using System.Reflection;
  38 using Mono.Web.Util;
  39 using System.Xml;
  40 using System.Configuration;
  41 using System.Configuration.Internal;
  42 using _Configuration = System.Configuration.Configuration;
  43 using System.Web.Util;
  44 using System.Threading;
  45 using System.Web.Hosting;
  46
  47 namespace System.Web.Configuration {
  48
  49         public static class WebConfigurationManager
  50         {
  51                 sealed class ConfigPath
  52                 {
  53                         public string Path;
  54                         public bool InAnotherApp;
  55
  56                         public ConfigPath (string path, bool inAnotherApp)
  57                         {
  58                                 this.Path = path;
  59                                 this.InAnotherApp = inAnotherApp;
  60                         }
  61                 }
  62
  63                 const int SAVE_LOCATIONS_CHECK_INTERVAL = 6000; // milliseconds
  64                 const int SECTION_CACHE_LOCK_TIMEOUT = 200; // milliseconds
  65
  66                 static readonly char[] pathTrimChars = { '/' };
  67                 static readonly object suppressAppReloadLock = new object ();
  68                 static readonly object saveLocationsCacheLock = new object ();
  69                 static readonly object getSectionLock = new object ();
  70
  71                 // See comment for the cacheLock field at top of System.Web.Caching/Cache.cs
  72                 static readonly ReaderWriterLockSlim sectionCacheLock;
  73
  74                 static IInternalConfigConfigurationFactory configFactory;
  75                 static Hashtable configurations = Hashtable.Synchronized (new Hashtable ());
  76                 static Hashtable configPaths = Hashtable.Synchronized (new Hashtable ());
  77                 static bool suppressAppReload;
  78                 static Dictionary <string, DateTime> saveLocationsCache;
  79                 static Timer saveLocationsTimer;
  80
  81                 static ArrayList extra_assemblies = null;
  82                 static internal ArrayList ExtraAssemblies {
  83                         get {
  84                                 if (extra_assemblies == null)
  85                                         extra_assemblies = new ArrayList();
  86                                 return extra_assemblies;
  87                         }
  88                 }
  89
  90                 const int DEFAULT_SECTION_CACHE_SIZE = 100;
  91                 const string CACHE_SIZE_OVERRIDING_KEY = "MONO_ASPNET_WEBCONFIG_CACHESIZE";
  92                 static LruCache<int, object> sectionCache;
  93
  94                 static WebConfigurationManager ()
  95                 {
  96                         var section_cache_size = DEFAULT_SECTION_CACHE_SIZE;
  97                         int section_cache_size_override;
  98                         bool size_overriden = false;
  99                         if (int.TryParse (Environment.GetEnvironmentVariable (CACHE_SIZE_OVERRIDING_KEY), out section_cache_size_override)) {
 100                                 section_cache_size = section_cache_size_override;
 101                                 size_overriden = true;
 102                                 Console.WriteLine ("WebConfigurationManager's LRUcache Size overriden to: {0} (via {1})", section_cache_size_override, CACHE_SIZE_OVERRIDING_KEY);
 103                         }
 104                         sectionCache = new LruCache<int, object> (section_cache_size);
 105                         string eviction_warning = "WebConfigurationManager's LRUcache evictions count reached its max size";
 106                         if (!size_overriden)
 107                                 eviction_warning += String.Format ("{0}Cache Size: {1} (overridable via {2})",
 108                                                                    Environment.NewLine, section_cache_size, CACHE_SIZE_OVERRIDING_KEY);
 109                         sectionCache.EvictionWarning = eviction_warning;
 110
 111                         configFactory = ConfigurationManager.ConfigurationFactory;
 112                         _Configuration.SaveStart += ConfigurationSaveHandler;
 113                         _Configuration.SaveEnd += ConfigurationSaveHandler;
 114
 115                         // Part of fix for bug #491531
 116                         Type type = Type.GetType ("System.Configuration.CustomizableFileSettingsProvider, System", false);
 117                         if (type != null) {
 118                                 FieldInfo fi = type.GetField ("webConfigurationFileMapType", BindingFlags.Static | BindingFlags.NonPublic);
 119                                 if (fi != null && fi.FieldType == Type.GetType ("System.Type"))
 120                                         fi.SetValue (null, typeof (ApplicationSettingsConfigurationFileMap));
 121                         }
 122
 123                         sectionCacheLock = new ReaderWriterLockSlim ();
 124                 }
 125
 126                 static void ReenableWatcherOnConfigLocation (object state)
 127                 {
 128                         string path = state as string;
 129                         if (String.IsNullOrEmpty (path))
 130                                 return;
 131
 132                         DateTime lastWrite;
 133                         lock (saveLocationsCacheLock) {
 134                                 if (!saveLocationsCache.TryGetValue (path, out lastWrite))
 135                                         lastWrite = DateTime.MinValue;
 136                         }
 137
 138                         DateTime now = DateTime.Now;
 139                         if (lastWrite == DateTime.MinValue || now.Subtract (lastWrite).TotalMilliseconds >= SAVE_LOCATIONS_CHECK_INTERVAL) {
 140                                 saveLocationsTimer.Dispose ();
 141                                 saveLocationsTimer = null;
 142                                 HttpApplicationFactory.EnableWatcher (VirtualPathUtility.RemoveTrailingSlash (HttpRuntime.AppDomainAppPath), "?eb.?onfig");
 143                         } else
 144                                 saveLocationsTimer.Change (SAVE_LOCATIONS_CHECK_INTERVAL, SAVE_LOCATIONS_CHECK_INTERVAL);
 145                 }
 146
 147                 static void ConfigurationSaveHandler (_Configuration sender, ConfigurationSaveEventArgs args)
 148                 {
 149                         try {
 150                                 sectionCacheLock.EnterWriteLock ();
 151                                 sectionCache.Clear ();
 152                         } finally {
 153                                 sectionCacheLock.ExitWriteLock ();
 154                         }
 155
 156                         lock (suppressAppReloadLock) {
 157                                 string rootConfigPath = WebConfigurationHost.GetWebConfigFileName (HttpRuntime.AppDomainAppPath);
 158                                 if (String.Compare (args.StreamPath, rootConfigPath, StringComparison.OrdinalIgnoreCase) == 0) {
 159                                         SuppressAppReload (args.Start);
 160                                         if (args.Start) {
 161                                                 HttpApplicationFactory.DisableWatcher (VirtualPathUtility.RemoveTrailingSlash (HttpRuntime.AppDomainAppPath), "?eb.?onfig");
 162
 163                                                 lock (saveLocationsCacheLock) {
 164                                                         if (saveLocationsCache == null)
 165                                                                 saveLocationsCache = new Dictionary <string, DateTime> (StringComparer.Ordinal);
 166                                                         if (saveLocationsCache.ContainsKey (rootConfigPath))
 167                                                                 saveLocationsCache [rootConfigPath] = DateTime.Now;
 168                                                         else
 169                                                                 saveLocationsCache.Add (rootConfigPath, DateTime.Now);
 170
 171                                                         if (saveLocationsTimer == null)
 172                                                                 saveLocationsTimer = new Timer (ReenableWatcherOnConfigLocation,
 173                                                                                                 rootConfigPath,
 174                                                                                                 SAVE_LOCATIONS_CHECK_INTERVAL,
 175                                                                                                 SAVE_LOCATIONS_CHECK_INTERVAL);
 176                                                 }
 177                                         }
 178                                 }
 179                         }
 180                 }
 181
 182                 public static _Configuration OpenMachineConfiguration ()
 183                 {
 184                         return ConfigurationManager.OpenMachineConfiguration ();
 185                 }
 186
 187                 [MonoLimitation ("locationSubPath is not handled")]
 188                 public static _Configuration OpenMachineConfiguration (string locationSubPath)
 189                 {
 190                         return OpenMachineConfiguration ();
 191                 }
 192
 193                 [MonoLimitation("Mono does not support remote configuration")]
 194                 public static _Configuration OpenMachineConfiguration (string locationSubPath,
 195                                                                        string server)
 196                 {
 197                         if (server == null)
 198                                 return OpenMachineConfiguration (locationSubPath);
 199
 200                         throw new NotSupportedException ("Mono doesn't support remote configuration");
 201                 }
 202
 203                 [MonoLimitation("Mono does not support remote configuration")]
 204                 public static _Configuration OpenMachineConfiguration (string locationSubPath,
 205                                                                        string server,
 206                                                                        IntPtr userToken)
 207                 {
 208                         if (server == null)
 209                                 return OpenMachineConfiguration (locationSubPath);
 210                         throw new NotSupportedException ("Mono doesn't support remote configuration");
 211                 }
 212
 213                 [MonoLimitation("Mono does not support remote configuration")]
 214                 public static _Configuration OpenMachineConfiguration (string locationSubPath,
 215                                                                        string server,
 216                                                                        string userName,
 217                                                                        string password)
 218                 {
 219                         if (server == null)
 220                                 return OpenMachineConfiguration (locationSubPath);
 221                         throw new NotSupportedException ("Mono doesn't support remote configuration");
 222                 }
 223
 224                 public static _Configuration OpenWebConfiguration (string path)
 225                 {
 226                         return OpenWebConfiguration (path, null, null, null, null, null);
 227                 }
 228
 229                 public static _Configuration OpenWebConfiguration (string path, string site)
 230                 {
 231                         return OpenWebConfiguration (path, site, null, null, null, null);
 232                 }
 233
 234                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath)
 235                 {
 236                         return OpenWebConfiguration (path, site, locationSubPath, null, null, null);
 237                 }
 238
 239                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server)
 240                 {
 241                         return OpenWebConfiguration (path, site, locationSubPath, server, null, null);
 242                 }
 243
 244                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server, IntPtr userToken)
 245                 {
 246                         return OpenWebConfiguration (path, site, locationSubPath, server, null, null);
 247                 }
 248
 249                 public static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server, string userName, string password)
 250                 {
 251                         return OpenWebConfiguration (path, site, locationSubPath, server, null, null, false);
 252                 }
 253
 254                 static _Configuration OpenWebConfiguration (string path, string site, string locationSubPath, string server, string userName, string password, bool fweb)
 255                 {
 256                         if (String.IsNullOrEmpty (path))
 257                                 path = "/";
 258
 259                         bool inAnotherApp = false;
 260                         if (!fweb && !String.IsNullOrEmpty (path))
 261                                 path = FindWebConfig (path, out inAnotherApp);
 262
 263                         string confKey = path + site + locationSubPath + server + userName + password;
 264                         _Configuration conf = null;
 265                         conf = (_Configuration) configurations [confKey];
 266                         if (conf == null) {
 267                                 conf = ConfigurationFactory.Create (typeof (WebConfigurationHost), null, path, site, locationSubPath, server, userName, password, inAnotherApp);
 268                                 configurations [confKey] = conf;
 269                         }
 270                         return conf;
 271                 }
 272
 273                 public static _Configuration OpenMappedWebConfiguration (WebConfigurationFileMap fileMap, string path)
 274                 {
 275                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap, path);
 276                 }
 277
 278                 public static _Configuration OpenMappedWebConfiguration (WebConfigurationFileMap fileMap, string path, string site)
 279                 {
 280                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap, path, site);
 281                 }
 282
 283                 public static _Configuration OpenMappedWebConfiguration (WebConfigurationFileMap fileMap, string path, string site, string locationSubPath)
 284                 {
 285                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap, path, site, locationSubPath);
 286                 }
 287
 288                 public static _Configuration OpenMappedMachineConfiguration (ConfigurationFileMap fileMap)
 289                 {
 290                         return ConfigurationFactory.Create (typeof(WebConfigurationHost), fileMap);
 291                 }
 292
 293                 public static _Configuration OpenMappedMachineConfiguration (ConfigurationFileMap fileMap,
 294                                                                              string locationSubPath)
 295                 {
 296                         return OpenMappedMachineConfiguration (fileMap);
 297                 }
 298
 299                 internal static object SafeGetSection (string sectionName, Type configSectionType)
 300                 {
 301                         try {
 302                                 return GetSection (sectionName);
 303                         } catch (Exception) {
 304                                 if (configSectionType != null)
 305                                         return Activator.CreateInstance (configSectionType);
 306                                 return null;
 307                         }
 308                 }
 309
 310                 internal static object SafeGetSection (string sectionName, string path, Type configSectionType)
 311                 {
 312                         try {
 313                                 return GetSection (sectionName, path);
 314                         } catch (Exception) {
 315                                 if (configSectionType != null)
 316                                         return Activator.CreateInstance (configSectionType);
 317                                 return null;
 318                         }
 319                 }
 320
 321                 public static object GetSection (string sectionName)
 322                 {
 323                         HttpContext context = HttpContext.Current;
 324                         return GetSection (sectionName, GetCurrentPath (context), context);
 325                 }
 326
 327                 public static object GetSection (string sectionName, string path)
 328                 {
 329                         return GetSection (sectionName, path, HttpContext.Current);
 330                 }
 331
 332                 static bool LookUpLocation (string relativePath, ref _Configuration defaultConfiguration)
 333                 {
 334                         if (String.IsNullOrEmpty (relativePath))
 335                                 return false;
 336
 337                         _Configuration cnew = defaultConfiguration.FindLocationConfiguration (relativePath, defaultConfiguration);
 338                         if (cnew == defaultConfiguration)
 339                                 return false;
 340
 341                         defaultConfiguration = cnew;
 342                         return true;
 343                 }
 344
 345                 internal static object GetSection (string sectionName, string path, HttpContext context)
 346                 {
 347                         if (String.IsNullOrEmpty (sectionName))
 348                                 return null;
 349
 350                         _Configuration c = OpenWebConfiguration (path, null, null, null, null, null, false);
 351                         string configPath = c.ConfigPath;
 352                         int baseCacheKey = 0;
 353                         int cacheKey;
 354                         bool pathPresent = !String.IsNullOrEmpty (path);
 355                         string locationPath = null;
 356
 357                         if (pathPresent)
 358                                 locationPath = "location_" + path;
 359
 360                         baseCacheKey = sectionName.GetHashCode ();
 361                         if (configPath != null)
 362                                 baseCacheKey ^= configPath.GetHashCode ();
 363
 364                         try {
 365                                 sectionCacheLock.EnterWriteLock ();
 366
 367                                 object o;
 368                                 if (pathPresent) {
 369                                         cacheKey = baseCacheKey ^ locationPath.GetHashCode ();
 370                                         if (sectionCache.TryGetValue (cacheKey, out o))
 371                                                 return o;
 372
 373                                         cacheKey = baseCacheKey ^ path.GetHashCode ();
 374                                         if (sectionCache.TryGetValue (cacheKey, out o))
 375                                                 return o;
 376                                 }
 377
 378                                 if (sectionCache.TryGetValue (baseCacheKey, out o))
 379                                         return o;
 380                         } finally {
 381                                 sectionCacheLock.ExitWriteLock ();
 382                         }
 383
 384                         string cachePath = null;
 385                         if (pathPresent) {
 386                                 string relPath;
 387
 388                                 if (VirtualPathUtility.IsRooted (path)) {
 389                                         if (path [0] == '~')
 390                                                 relPath = path.Length > 1 ? path.Substring (2) : String.Empty;
 391                                         else if (path [0] == '/')
 392                                                 relPath = path.Substring (1);
 393                                         else
 394                                                 relPath = path;
 395                                 } else
 396                                         relPath = path;
 397
 398                                 HttpRequest req = context != null ? context.Request : null;
 399                                 if (req != null) {
 400                                         string vdir = VirtualPathUtility.GetDirectory (req.PathNoValidation);
 401                                         if (vdir != null) {
 402                                                 vdir = vdir.TrimEnd (pathTrimChars);
 403                                                 if (String.Compare (c.ConfigPath, vdir, StringComparison.Ordinal) != 0 && LookUpLocation (vdir.Trim (pathTrimChars), ref c))
 404                                                         cachePath = path;
 405                                         }
 406                                 }
 407
 408                                 if (LookUpLocation (relPath, ref c))
 409                                         cachePath = locationPath;
 410                                 else
 411                                         cachePath = path;
 412                         }
 413
 414                         ConfigurationSection section;
 415                         lock (getSectionLock) {
 416                                 section = c.GetSection (sectionName);
 417                         }
 418                         if (section == null)
 419                                 return null;
 420
 421                         object value = SettingsMappingManager.MapSection (section.GetRuntimeObject ());
 422                         if (cachePath != null)
 423                                 cacheKey = baseCacheKey ^ cachePath.GetHashCode ();
 424                         else
 425                                 cacheKey = baseCacheKey;
 426
 427                         AddSectionToCache (cacheKey, value);
 428                         return value;
 429                 }
 430
 431                 static string MapPath (HttpRequest req, string virtualPath)
 432                 {
 433                         if (req != null)
 434                                 return req.MapPath (virtualPath);
 435
 436                         string appRoot = HttpRuntime.AppDomainAppVirtualPath;
 437                         if (!String.IsNullOrEmpty (appRoot) && virtualPath.StartsWith (appRoot, StringComparison.Ordinal)) {
 438                                 if (String.Compare (virtualPath, appRoot, StringComparison.Ordinal) == 0)
 439                                         return HttpRuntime.AppDomainAppPath;
 440                                 return UrlUtils.Combine (HttpRuntime.AppDomainAppPath, virtualPath.Substring (appRoot.Length));
 441                         }
 442
 443                         return null;
 444                 }
 445
 446                 static string GetParentDir (string rootPath, string curPath)
 447                 {
 448                         int len = curPath.Length - 1;
 449                         if (len > 0 && curPath [len] == '/')
 450                                 curPath = curPath.Substring (0, len);
 451
 452                         if (String.Compare (curPath, rootPath, StringComparison.Ordinal) == 0)
 453                                 return null;
 454
 455                         int idx = curPath.LastIndexOf ('/');
 456                         if (idx == -1)
 457                                 return curPath;
 458
 459                         if (idx == 0)
 460                                 return "/";
 461
 462                         return curPath.Substring (0, idx);
 463                 }
 464
 465                 internal static string FindWebConfig (string path)
 466                 {
 467                         bool dummy;
 468
 469                         return FindWebConfig (path, out dummy);
 470                 }
 471
 472                 internal static string FindWebConfig (string path, out bool inAnotherApp)
 473                 {
 474                         inAnotherApp = false;
 475
 476                         if (String.IsNullOrEmpty (path))
 477                                 return path;
 478
 479                         if (HostingEnvironment.VirtualPathProvider != null) {
 480                                 if (HostingEnvironment.VirtualPathProvider.DirectoryExists (path))
 481                                         path = VirtualPathUtility.AppendTrailingSlash (path);
 482                         }
 483
 484
 485                         string rootPath = HttpRuntime.AppDomainAppVirtualPath;
 486                         ConfigPath curPath;
 487                         curPath = configPaths [path] as ConfigPath;
 488                         if (curPath != null) {
 489                                 inAnotherApp = curPath.InAnotherApp;
 490                                 return curPath.Path;
 491                         }
 492
 493                         HttpContext ctx = HttpContext.Current;
 494                         HttpRequest req = ctx != null ? ctx.Request : null;
 495                         string physPath = req != null ? VirtualPathUtility.AppendTrailingSlash (MapPath (req, path)) : null;
 496                         string appDomainPath = HttpRuntime.AppDomainAppPath;
 497
 498                         if (physPath != null && appDomainPath != null && !physPath.StartsWith (appDomainPath, StringComparison.Ordinal))
 499                                 inAnotherApp = true;
 500
 501                         string dir;
 502                         if (inAnotherApp || path [path.Length - 1] == '/')
 503                                 dir = path;
 504                         else {
 505                                 dir = VirtualPathUtility.GetDirectory (path, false);
 506                                 if (dir == null)
 507                                         return path;
 508                         }
 509
 510                         curPath = configPaths [dir] as ConfigPath;
 511                         if (curPath != null) {
 512                                 inAnotherApp = curPath.InAnotherApp;
 513                                 return curPath.Path;
 514                         }
 515
 516                         if (req == null)
 517                                 return path;
 518
 519                         curPath = new ConfigPath (path, inAnotherApp);
 520                         while (String.Compare (curPath.Path, rootPath, StringComparison.Ordinal) != 0) {
 521                                 physPath = MapPath (req, curPath.Path);
 522                                 if (physPath == null) {
 523                                         curPath.Path = rootPath;
 524                                         break;
 525                                 }
 526
 527                                 if (WebConfigurationHost.GetWebConfigFileName (physPath) != null)
 528                                         break;
 529
 530                                 curPath.Path = GetParentDir (rootPath, curPath.Path);
 531                                 if (curPath.Path == null || curPath.Path == "~") {
 532                                         curPath.Path = rootPath;
 533                                         break;
 534                                 }
 535                         }
 536
 537                         if (String.Compare (curPath.Path, path, StringComparison.Ordinal) != 0)
 538                                 configPaths [path] = curPath;
 539                         else
 540                                 configPaths [dir] = curPath;
 541
 542                         return curPath.Path;
 543                 }
 544
 545                 static string GetCurrentPath (HttpContext ctx)
 546                 {
 547                         HttpRequest req = ctx != null ? ctx.Request : null;
 548                         return req != null ? req.PathNoValidation : HttpRuntime.AppDomainAppVirtualPath;
 549                 }
 550
 551                 internal static bool SuppressAppReload (bool newValue)
 552                 {
 553                         bool ret;
 554
 555                         lock (suppressAppReloadLock) {
 556                                 ret = suppressAppReload;
 557                                 suppressAppReload = newValue;
 558                         }
 559
 560                         return ret;
 561                 }
 562
 563                 internal static void RemoveConfigurationFromCache (HttpContext ctx)
 564                 {
 565                         configurations.Remove (GetCurrentPath (ctx));
 566                 }
 567
 568
 569                 public static object GetWebApplicationSection (string sectionName)
 570                 {
 571                         HttpContext ctx = HttpContext.Current;
 572                         HttpRequest req = ctx != null ? ctx.Request : null;
 573                         string applicationPath = req != null ? req.ApplicationPath : null;
 574                         return GetSection (sectionName, String.IsNullOrEmpty (applicationPath) ? String.Empty : applicationPath);
 575                 }
 576
 577                 public static NameValueCollection AppSettings {
 578                         get { return ConfigurationManager.AppSettings; }
 579                 }
 580
 581                 public static ConnectionStringSettingsCollection ConnectionStrings {
 582                         get { return ConfigurationManager.ConnectionStrings; }
 583                 }
 584
 585                 internal static IInternalConfigConfigurationFactory ConfigurationFactory {
 586                         get { return configFactory; }
 587                 }
 588
 589                 static void AddSectionToCache (int key, object section)
 590                 {
 591                         object cachedSection;
 592
 593                         bool locked = false;
 594                         try {
 595                                 if (!sectionCacheLock.TryEnterWriteLock (SECTION_CACHE_LOCK_TIMEOUT))
 596                                         return;
 597                                 locked = true;
 598
 599                                 if (sectionCache.TryGetValue (key, out cachedSection) && cachedSection != null)
 600                                         return;
 601
 602                                 sectionCache.Add (key, section);
 603                         } finally {
 604                                 if (locked) {
 605                                         sectionCacheLock.ExitWriteLock ();
 606                                 }
 607                         }
 608                 }
 609
 610 #region stuff copied from WebConfigurationSettings
 611                 static internal IConfigurationSystem oldConfig;
 612                 static Web20DefaultConfig config;
 613                 //static IInternalConfigSystem configSystem;
 614                 const BindingFlags privStatic = BindingFlags.NonPublic | BindingFlags.Static;
 615                 static readonly object lockobj = new object ();
 616
 617                 internal static void Init ()
 618                 {
 619                         lock (lockobj) {
 620                                 if (config != null)
 621                                         return;
 622
 623                                 /* deal with the ConfigurationSettings stuff */
 624                                 {
 625                                         Web20DefaultConfig settings = Web20DefaultConfig.GetInstance ();
 626                                         Type t = typeof (ConfigurationSettings);
 627                                         MethodInfo changeConfig = t.GetMethod ("ChangeConfigurationSystem",
 628                                                                                privStatic);
 629
 630                                         if (changeConfig == null)
 631                                                 throw new ConfigurationException ("Cannot find method CCS");
 632
 633                                         object [] args = new object [] {settings};
 634                                         oldConfig = (IConfigurationSystem)changeConfig.Invoke (null, args);
 635                                         config = settings;
 636
 637                                         config.Init ();
 638                                 }
 639
 640                                 /* deal with the ConfigurationManager stuff */
 641                                 {
 642                                         HttpConfigurationSystem system = new HttpConfigurationSystem ();
 643                                         Type t = typeof (ConfigurationManager);
 644                                         MethodInfo changeConfig = t.GetMethod ("ChangeConfigurationSystem",
 645                                                                                privStatic);
 646
 647                                         if (changeConfig == null)
 648                                                 throw new ConfigurationException ("Cannot find method CCS");
 649
 650                                         object [] args = new object [] {system};
 651                                         changeConfig.Invoke (null, args);
 652                                         //configSystem = system;
 653                                 }
 654                         }
 655                 }
 656         }
 657
 658         class Web20DefaultConfig : IConfigurationSystem
 659         {
 660                 static Web20DefaultConfig instance;
 661
 662                 static Web20DefaultConfig ()
 663                 {
 664                         instance = new Web20DefaultConfig ();
 665                 }
 666
 667                 public static Web20DefaultConfig GetInstance ()
 668                 {
 669                         return instance;
 670                 }
 671
 672                 public object GetConfig (string sectionName)
 673                 {
 674                         object o = WebConfigurationManager.GetWebApplicationSection (sectionName);
 675
 676                         if (o == null || o is IgnoreSection) {
 677                                 /* this can happen when the section
 678                                  * handler doesn't subclass from
 679                                  * ConfigurationSection.  let's be
 680                                  * nice and try to load it using the
 681                                  * 1.x style routines in case there's
 682                                  * a 1.x section handler registered
 683                                  * for it.
 684                                  */
 685                                 object o1 = WebConfigurationManager.oldConfig.GetConfig (sectionName);
 686                                 if (o1 != null)
 687                                         return o1;
 688                         }
 689
 690                         return o;
 691                 }
 692
 693                 public void Init ()
 694                 {
 695                         // nothing. We need a context.
 696                 }
 697         }
 698 #endregion
 699 }
 700