| | | 1 | | // Licensed to the .NET Foundation under one or more agreements. |
| | | 2 | | // The .NET Foundation licenses this file to you under the MIT license. |
| | | 3 | | |
| | | 4 | | using System; |
| | | 5 | | using System.Collections; |
| | | 6 | | using System.Collections.Generic; |
| | | 7 | | using System.Globalization; |
| | | 8 | | using System.Linq; |
| | | 9 | | using CoreWCF.Runtime; |
| | | 10 | | using CoreWCF.Runtime.Collections; |
| | | 11 | | |
| | | 12 | | namespace CoreWCF.Channels |
| | | 13 | | { |
| | | 14 | | internal sealed class UriPrefixTable<TItem> : IEnumerable<KeyValuePair<BaseUriWithWildcard, TItem>> |
| | | 15 | | where TItem : class |
| | | 16 | | { |
| | | 17 | | private const int HopperSize = 128; |
| | | 18 | | private volatile HopperCache _lookupCache; // cache matches, for lookup speed |
| | | 19 | | private readonly SegmentHierarchyNode<TItem> _root; |
| | | 20 | | private readonly bool _useWeakReferences; |
| | | 21 | | private readonly bool _includePortInComparison; |
| | | 22 | | |
| | | 23 | | public UriPrefixTable() |
| | | 24 | | : this(false) |
| | | 25 | | { |
| | | 26 | | } |
| | | 27 | | |
| | | 28 | | public UriPrefixTable(bool includePortInComparison) |
| | | 29 | | : this(includePortInComparison, false) |
| | | 30 | | { |
| | | 31 | | } |
| | | 32 | | |
| | | 33 | | public UriPrefixTable(bool includePortInComparison, bool useWeakReferences) |
| | | 34 | | { |
| | | 35 | | _includePortInComparison = includePortInComparison; |
| | | 36 | | _useWeakReferences = useWeakReferences; |
| | | 37 | | _root = new SegmentHierarchyNode<TItem>(null, useWeakReferences); |
| | | 38 | | _lookupCache = new HopperCache(HopperSize, useWeakReferences); |
| | | 39 | | } |
| | | 40 | | |
| | | 41 | | internal UriPrefixTable(UriPrefixTable<TItem> objectToClone) |
| | | 42 | | : this(objectToClone._includePortInComparison, objectToClone._useWeakReferences) |
| | | 43 | | { |
| | | 44 | | if (objectToClone.Count > 0) |
| | | 45 | | { |
| | | 46 | | foreach (KeyValuePair<BaseUriWithWildcard, TItem> current in objectToClone.GetAll()) |
| | | 47 | | { |
| | | 48 | | RegisterUri(current.Key.BaseAddress, current.Key.HostNameComparisonMode, current.Value); |
| | | 49 | | } |
| | | 50 | | } |
| | | 51 | | } |
| | | 52 | | |
| | | 53 | | private object ThisLock |
| | | 54 | | { |
| | | 55 | | get |
| | | 56 | | { |
| | | 57 | | // The UriPrefixTable instance itself is used as a |
| | | 58 | | // synchronization primitive in the TransportManagers and the |
| | | 59 | | // TransportManagerContainers so we return 'this' to keep them in sync. |
| | | 60 | | return this; |
| | | 61 | | } |
| | | 62 | | } |
| | | 63 | | |
| | | 64 | | public int Count { get; private set; } |
| | | 65 | | |
| | | 66 | | public AsyncLock AsyncLock { get; } = new AsyncLock(); |
| | | 67 | | |
| | | 68 | | public bool IsRegistered(BaseUriWithWildcard key) |
| | | 69 | | { |
| | | 70 | | Uri uri = key.BaseAddress; |
| | | 71 | | |
| | | 72 | | // don't need to normalize path since SegmentHierarchyNode is |
| | | 73 | | // already OrdinalIgnoreCase |
| | | 74 | | string[] paths = UriSegmenter.ToPath(uri, key.HostNameComparisonMode, _includePortInComparison); |
| | | 75 | | bool exactMatch; |
| | | 76 | | SegmentHierarchyNode<TItem> node; |
| | | 77 | | using (AsyncLock.TakeLock()) |
| | | 78 | | { |
| | | 79 | | node = FindDataNode(paths, out exactMatch); |
| | | 80 | | } |
| | | 81 | | return exactMatch && node != null && node.Data != null; |
| | | 82 | | } |
| | | 83 | | |
| | | 84 | | public IEnumerable<KeyValuePair<BaseUriWithWildcard, TItem>> GetAll() |
| | | 85 | | { |
| | | 86 | | using (AsyncLock.TakeLock()) |
| | | 87 | | { |
| | | 88 | | List<KeyValuePair<BaseUriWithWildcard, TItem>> result = new List<KeyValuePair<BaseUriWithWildcard, TItem |
| | | 89 | | _root.Collect(result); |
| | | 90 | | return result; |
| | | 91 | | } |
| | | 92 | | } |
| | | 93 | | |
| | | 94 | | private bool TryCacheLookup(BaseUriWithWildcard key, out TItem item) |
| | | 95 | | { |
| | | 96 | | object value = _lookupCache.GetValue(ThisLock, key); |
| | | 97 | | |
| | | 98 | | // We might return null and true in the case of DBNull (cached negative result). |
| | | 99 | | // When TItem is object, the cast isn't sufficient to weed out DBNulls, so we need an explicit check. |
| | | 100 | | item = value == DBNull.Value ? null : (TItem)value; |
| | | 101 | | return value != null; |
| | | 102 | | } |
| | | 103 | | |
| | | 104 | | private void AddToCache(BaseUriWithWildcard key, TItem item) |
| | | 105 | | { |
| | | 106 | | // Don't allow explicitly adding DBNulls. |
| | | 107 | | Fx.Assert(item != DBNull.Value, "Can't add DBNull to UriPrefixTable."); |
| | | 108 | | |
| | | 109 | | // HopperCache uses null as 'doesn't exist', so use DBNull as a stand-in for null. |
| | | 110 | | _lookupCache.Add(key, item ?? (object)DBNull.Value); |
| | | 111 | | } |
| | | 112 | | |
| | | 113 | | private void ClearCache() |
| | | 114 | | { |
| | | 115 | | _lookupCache = new HopperCache(HopperSize, _useWeakReferences); |
| | | 116 | | } |
| | | 117 | | |
| | | 118 | | public bool TryLookupUri(Uri uri, HostNameComparisonMode hostNameComparisonMode, out TItem item) |
| | | 119 | | { |
| | | 120 | | BaseUriWithWildcard key = new BaseUriWithWildcard(uri, hostNameComparisonMode); |
| | | 121 | | if (TryCacheLookup(key, out item)) |
| | | 122 | | { |
| | | 123 | | return item != null; |
| | | 124 | | } |
| | | 125 | | |
| | | 126 | | using (AsyncLock.TakeLock()) |
| | | 127 | | { |
| | | 128 | | // exact match failed, perform the full lookup (which will also |
| | | 129 | | // catch case-insensitive variations that aren't yet in our cache) |
| | | 130 | | SegmentHierarchyNode<TItem> node = FindDataNode( |
| | | 131 | | UriSegmenter.ToPath(key.BaseAddress, hostNameComparisonMode, _includePortInComparison), out bool dum |
| | | 132 | | if (node != null) |
| | | 133 | | { |
| | | 134 | | item = node.Data; |
| | | 135 | | } |
| | | 136 | | // We want to cache both positive AND negative results |
| | | 137 | | AddToCache(key, item); |
| | | 138 | | return (item != null); |
| | | 139 | | } |
| | | 140 | | } |
| | | 141 | | |
| | | 142 | | public void RegisterUri(Uri uri, HostNameComparisonMode hostNameComparisonMode, TItem item) |
| | | 143 | | { |
| | | 144 | | Fx.Assert(HostNameComparisonModeHelper.IsDefined(hostNameComparisonMode), "RegisterUri: Invalid HostNameComp |
| | | 145 | | |
| | | 146 | | using (AsyncLock.TakeLock()) |
| | | 147 | | { |
| | | 148 | | // Since every newly registered Uri could alter what Prefixes should have matched, we |
| | | 149 | | // should clear the cache of any existing results and start over |
| | | 150 | | ClearCache(); |
| | | 151 | | BaseUriWithWildcard key = new BaseUriWithWildcard(uri, hostNameComparisonMode); |
| | | 152 | | SegmentHierarchyNode<TItem> node = FindOrCreateNode(key); |
| | | 153 | | if (node.Data != null) |
| | | 154 | | { |
| | | 155 | | throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SRCommon.For |
| | | 156 | | SRCommon.DuplicateRegistration, uri))); |
| | | 157 | | } |
| | | 158 | | node.SetData(item, key); |
| | | 159 | | Count++; |
| | | 160 | | } |
| | | 161 | | } |
| | | 162 | | |
| | | 163 | | public void UnregisterUri(Uri uri, HostNameComparisonMode hostNameComparisonMode) |
| | | 164 | | { |
| | | 165 | | using (AsyncLock.TakeLock()) |
| | | 166 | | { |
| | | 167 | | // Since every removed Uri could alter what Prefixes should have matched, we |
| | | 168 | | // should clear the cache of any existing results and start over |
| | | 169 | | ClearCache(); |
| | | 170 | | string[] path = UriSegmenter.ToPath(uri, hostNameComparisonMode, _includePortInComparison); |
| | | 171 | | // Never remove the root |
| | | 172 | | if (path.Length == 0) |
| | | 173 | | { |
| | | 174 | | _root.RemoveData(); |
| | | 175 | | } |
| | | 176 | | else |
| | | 177 | | { |
| | | 178 | | _root.RemovePath(path, 0); |
| | | 179 | | } |
| | | 180 | | Count--; |
| | | 181 | | } |
| | | 182 | | } |
| | | 183 | | |
| | | 184 | | private SegmentHierarchyNode<TItem> FindDataNode(string[] path, out bool exactMatch) |
| | | 185 | | { |
| | | 186 | | Fx.Assert(path != null, "FindDataNode: path is null"); |
| | | 187 | | |
| | | 188 | | exactMatch = false; |
| | | 189 | | SegmentHierarchyNode<TItem> current = _root; |
| | | 190 | | SegmentHierarchyNode<TItem> result = null; |
| | | 191 | | for (int i = 0; i < path.Length; ++i) |
| | | 192 | | { |
| | | 193 | | if (!current.TryGetChild(path[i], out SegmentHierarchyNode<TItem> next)) |
| | | 194 | | { |
| | | 195 | | break; |
| | | 196 | | } |
| | | 197 | | else if (next.Data != null) |
| | | 198 | | { |
| | | 199 | | result = next; |
| | | 200 | | exactMatch = (i == path.Length - 1); |
| | | 201 | | } |
| | | 202 | | current = next; |
| | | 203 | | } |
| | | 204 | | return result; |
| | | 205 | | } |
| | | 206 | | |
| | | 207 | | private SegmentHierarchyNode<TItem> FindOrCreateNode(BaseUriWithWildcard baseUri) |
| | | 208 | | { |
| | | 209 | | Fx.Assert(baseUri != null, "FindOrCreateNode: baseUri is null"); |
| | | 210 | | |
| | | 211 | | string[] path = UriSegmenter.ToPath(baseUri.BaseAddress, baseUri.HostNameComparisonMode, _includePortInCompa |
| | | 212 | | SegmentHierarchyNode<TItem> current = _root; |
| | | 213 | | for (int i = 0; i < path.Length; ++i) |
| | | 214 | | { |
| | | 215 | | if (!current.TryGetChild(path[i], out SegmentHierarchyNode<TItem> next)) |
| | | 216 | | { |
| | | 217 | | next = new SegmentHierarchyNode<TItem>(path[i], _useWeakReferences); |
| | | 218 | | current.SetChildNode(path[i], next); |
| | | 219 | | } |
| | | 220 | | current = next; |
| | | 221 | | } |
| | | 222 | | return current; |
| | | 223 | | } |
| | | 224 | | |
| | | 225 | | public IEnumerator<KeyValuePair<BaseUriWithWildcard, TItem>> GetEnumerator() => GetAll().GetEnumerator(); |
| | | 226 | | IEnumerator IEnumerable.GetEnumerator() => GetAll().GetEnumerator(); |
| | | 227 | | |
| | | 228 | | private static class UriSegmenter |
| | | 229 | | { |
| | | 230 | | internal static string[] ToPath(Uri uriPath, HostNameComparisonMode hostNameComparisonMode, |
| | | 231 | | bool includePortInComparison) |
| | | 232 | | { |
| | | 233 | | if (null == uriPath) |
| | | 234 | | { |
| | | 235 | | return Array.Empty<string>(); |
| | | 236 | | } |
| | | 237 | | UriSegmentEnum segmentEnum = new UriSegmentEnum(uriPath); // struct |
| | | 238 | | return segmentEnum.GetSegments(hostNameComparisonMode, includePortInComparison); |
| | | 239 | | } |
| | | 240 | | |
| | | 241 | | private struct UriSegmentEnum |
| | | 242 | | { |
| | | 243 | | private string _segment; |
| | | 244 | | private int _segmentStartAt; |
| | | 245 | | private int _segmentLength; |
| | | 246 | | private UriSegmentType _type; |
| | | 247 | | private readonly Uri _uri; |
| | | 248 | | |
| | | 249 | | internal UriSegmentEnum(Uri uri) |
| | | 250 | | { |
| | | 251 | | Fx.Assert(null != uri, "UreSegmentEnum: null uri"); |
| | | 252 | | _uri = uri; |
| | | 253 | | _type = UriSegmentType.Unknown; |
| | | 254 | | _segment = null; |
| | | 255 | | _segmentStartAt = 0; |
| | | 256 | | _segmentLength = 0; |
| | | 257 | | } |
| | | 258 | | |
| | | 259 | | private void ClearSegment() |
| | | 260 | | { |
| | | 261 | | _type = UriSegmentType.None; |
| | | 262 | | _segment = string.Empty; |
| | | 263 | | _segmentStartAt = 0; |
| | | 264 | | _segmentLength = 0; |
| | | 265 | | } |
| | | 266 | | |
| | | 267 | | public string[] GetSegments(HostNameComparisonMode hostNameComparisonMode, |
| | | 268 | | bool includePortInComparison) |
| | | 269 | | { |
| | | 270 | | List<string> segments = new List<string>(); |
| | | 271 | | while (Next()) |
| | | 272 | | { |
| | | 273 | | switch (_type) |
| | | 274 | | { |
| | | 275 | | case UriSegmentType.Path: |
| | | 276 | | segments.Add(_segment.Substring(_segmentStartAt, _segmentLength)); |
| | | 277 | | break; |
| | | 278 | | |
| | | 279 | | case UriSegmentType.Host: |
| | | 280 | | if (hostNameComparisonMode == HostNameComparisonMode.StrongWildcard) |
| | | 281 | | { |
| | | 282 | | segments.Add("+"); |
| | | 283 | | } |
| | | 284 | | else if (hostNameComparisonMode == HostNameComparisonMode.Exact) |
| | | 285 | | { |
| | | 286 | | segments.Add(_segment); |
| | | 287 | | } |
| | | 288 | | else |
| | | 289 | | { |
| | | 290 | | segments.Add("*"); |
| | | 291 | | } |
| | | 292 | | break; |
| | | 293 | | |
| | | 294 | | case UriSegmentType.Port: |
| | | 295 | | if (includePortInComparison || hostNameComparisonMode == HostNameComparisonMode.Exact) |
| | | 296 | | { |
| | | 297 | | segments.Add(_segment); |
| | | 298 | | } |
| | | 299 | | break; |
| | | 300 | | |
| | | 301 | | default: |
| | | 302 | | segments.Add(_segment); |
| | | 303 | | break; |
| | | 304 | | } |
| | | 305 | | } |
| | | 306 | | return segments.ToArray(); |
| | | 307 | | } |
| | | 308 | | |
| | | 309 | | public bool Next() |
| | | 310 | | { |
| | | 311 | | while (true) |
| | | 312 | | { |
| | | 313 | | switch (_type) |
| | | 314 | | { |
| | | 315 | | case UriSegmentType.Unknown: |
| | | 316 | | _type = UriSegmentType.Scheme; |
| | | 317 | | SetSegment(_uri.Scheme); |
| | | 318 | | return true; |
| | | 319 | | |
| | | 320 | | case UriSegmentType.Scheme: |
| | | 321 | | _type = UriSegmentType.Host; |
| | | 322 | | string host = _uri.Host; |
| | | 323 | | // The userName+password also accompany... |
| | | 324 | | string userInfo = _uri.UserInfo; |
| | | 325 | | if (null != userInfo && userInfo.Length > 0) |
| | | 326 | | { |
| | | 327 | | host = userInfo + '@' + host; |
| | | 328 | | } |
| | | 329 | | SetSegment(host); |
| | | 330 | | return true; |
| | | 331 | | |
| | | 332 | | case UriSegmentType.Host: |
| | | 333 | | _type = UriSegmentType.Port; |
| | | 334 | | int port = _uri.Port; |
| | | 335 | | SetSegment(port.ToString(CultureInfo.InvariantCulture)); |
| | | 336 | | return true; |
| | | 337 | | |
| | | 338 | | case UriSegmentType.Port: |
| | | 339 | | _type = UriSegmentType.Path; |
| | | 340 | | string absPath = _uri.AbsolutePath; |
| | | 341 | | Fx.Assert(null != absPath, "Next: nill absPath"); |
| | | 342 | | if (0 == absPath.Length) |
| | | 343 | | { |
| | | 344 | | ClearSegment(); |
| | | 345 | | return false; |
| | | 346 | | } |
| | | 347 | | _segment = absPath; |
| | | 348 | | _segmentStartAt = 0; |
| | | 349 | | _segmentLength = 0; |
| | | 350 | | return NextPathSegment(); |
| | | 351 | | |
| | | 352 | | case UriSegmentType.Path: |
| | | 353 | | return NextPathSegment(); |
| | | 354 | | |
| | | 355 | | case UriSegmentType.None: |
| | | 356 | | return false; |
| | | 357 | | |
| | | 358 | | default: |
| | | 359 | | Fx.Assert("Next: unknown enum value"); |
| | | 360 | | return false; |
| | | 361 | | } |
| | | 362 | | } |
| | | 363 | | } |
| | | 364 | | |
| | | 365 | | public bool NextPathSegment() |
| | | 366 | | { |
| | | 367 | | _segmentStartAt += _segmentLength; |
| | | 368 | | while (_segmentStartAt < _segment.Length && _segment[_segmentStartAt] == '/') |
| | | 369 | | { |
| | | 370 | | _segmentStartAt++; |
| | | 371 | | } |
| | | 372 | | |
| | | 373 | | if (_segmentStartAt < _segment.Length) |
| | | 374 | | { |
| | | 375 | | int next = _segment.IndexOf('/', _segmentStartAt); |
| | | 376 | | if (-1 == next) |
| | | 377 | | { |
| | | 378 | | _segmentLength = _segment.Length - _segmentStartAt; |
| | | 379 | | } |
| | | 380 | | else |
| | | 381 | | { |
| | | 382 | | _segmentLength = next - _segmentStartAt; |
| | | 383 | | } |
| | | 384 | | return true; |
| | | 385 | | } |
| | | 386 | | ClearSegment(); |
| | | 387 | | return false; |
| | | 388 | | } |
| | | 389 | | |
| | | 390 | | private void SetSegment(string segment) |
| | | 391 | | { |
| | | 392 | | _segment = segment; |
| | | 393 | | _segmentStartAt = 0; |
| | | 394 | | _segmentLength = segment.Length; |
| | | 395 | | } |
| | | 396 | | |
| | | 397 | | private enum UriSegmentType |
| | | 398 | | { |
| | | 399 | | Unknown, |
| | | 400 | | Scheme, |
| | | 401 | | Host, |
| | | 402 | | Port, |
| | | 403 | | Path, |
| | | 404 | | None |
| | | 405 | | } |
| | | 406 | | } |
| | | 407 | | } |
| | | 408 | | } |
| | | 409 | | |
| | | 410 | | internal class SegmentHierarchyNode<TData> |
| | | 411 | | where TData : class |
| | | 412 | | { |
| | | 413 | | private BaseUriWithWildcard _path; |
| | | 414 | | private TData _data; |
| | | 415 | | private readonly string _name; |
| | | 416 | | private readonly Dictionary<string, SegmentHierarchyNode<TData>> _children; |
| | | 417 | | private WeakReference _weakData; |
| | | 418 | | private readonly bool _useWeakReferences; |
| | | 419 | | |
| | 0 | 420 | | public SegmentHierarchyNode(string name, bool useWeakReferences) |
| | | 421 | | { |
| | 0 | 422 | | _name = name; |
| | 0 | 423 | | _useWeakReferences = useWeakReferences; |
| | 0 | 424 | | _children = new Dictionary<string, SegmentHierarchyNode<TData>>(StringComparer.OrdinalIgnoreCase); |
| | 0 | 425 | | } |
| | | 426 | | |
| | | 427 | | public TData Data |
| | | 428 | | { |
| | | 429 | | get |
| | | 430 | | { |
| | 0 | 431 | | if (_useWeakReferences) |
| | | 432 | | { |
| | 0 | 433 | | if (_weakData == null) |
| | | 434 | | { |
| | 0 | 435 | | return null; |
| | | 436 | | } |
| | | 437 | | else |
| | | 438 | | { |
| | 0 | 439 | | return _weakData.Target as TData; |
| | | 440 | | } |
| | | 441 | | } |
| | | 442 | | else |
| | | 443 | | { |
| | 0 | 444 | | return _data; |
| | | 445 | | } |
| | | 446 | | } |
| | | 447 | | } |
| | | 448 | | |
| | | 449 | | public void SetData(TData data, BaseUriWithWildcard path) |
| | | 450 | | { |
| | 0 | 451 | | _path = path; |
| | 0 | 452 | | if (_useWeakReferences) |
| | | 453 | | { |
| | 0 | 454 | | if (data == null) |
| | | 455 | | { |
| | 0 | 456 | | _weakData = null; |
| | | 457 | | } |
| | | 458 | | else |
| | | 459 | | { |
| | 0 | 460 | | _weakData = new WeakReference(data); |
| | | 461 | | } |
| | | 462 | | } |
| | | 463 | | else |
| | | 464 | | { |
| | 0 | 465 | | _data = data; |
| | | 466 | | } |
| | 0 | 467 | | } |
| | | 468 | | |
| | | 469 | | public void SetChildNode(string name, SegmentHierarchyNode<TData> node) |
| | | 470 | | { |
| | 0 | 471 | | _children[name] = node; |
| | 0 | 472 | | } |
| | | 473 | | |
| | | 474 | | public void Collect(List<KeyValuePair<BaseUriWithWildcard, TData>> result) |
| | | 475 | | { |
| | 0 | 476 | | TData localData = Data; |
| | 0 | 477 | | if (localData != null) |
| | | 478 | | { |
| | 0 | 479 | | result.Add(new KeyValuePair<BaseUriWithWildcard, TData>(_path, localData)); |
| | | 480 | | } |
| | | 481 | | |
| | 0 | 482 | | foreach (SegmentHierarchyNode<TData> child in _children.Values) |
| | | 483 | | { |
| | 0 | 484 | | child.Collect(result); |
| | | 485 | | } |
| | 0 | 486 | | } |
| | | 487 | | |
| | | 488 | | public bool TryGetChild(string segment, out SegmentHierarchyNode<TData> value) |
| | | 489 | | { |
| | 0 | 490 | | return _children.TryGetValue(segment, out value); |
| | | 491 | | } |
| | | 492 | | |
| | | 493 | | public void RemoveData() |
| | | 494 | | { |
| | 0 | 495 | | SetData(null, null); |
| | 0 | 496 | | } |
| | | 497 | | |
| | | 498 | | // bool is whether to remove this node |
| | | 499 | | public bool RemovePath(string[] path, int seg) |
| | | 500 | | { |
| | 0 | 501 | | if (seg == path.Length) |
| | | 502 | | { |
| | 0 | 503 | | RemoveData(); |
| | 0 | 504 | | return _children.Count == 0; |
| | | 505 | | } |
| | | 506 | | |
| | 0 | 507 | | if (!TryGetChild(path[seg], out SegmentHierarchyNode<TData> node)) |
| | | 508 | | { |
| | 0 | 509 | | return (_children.Count == 0 && Data == null); |
| | | 510 | | } |
| | | 511 | | |
| | 0 | 512 | | if (node.RemovePath(path, seg + 1)) |
| | | 513 | | { |
| | 0 | 514 | | _children.Remove(path[seg]); |
| | 0 | 515 | | return (_children.Count == 0 && Data == null); |
| | | 516 | | } |
| | | 517 | | else |
| | | 518 | | { |
| | 0 | 519 | | return false; |
| | | 520 | | } |
| | | 521 | | } |
| | | 522 | | } |
| | | 523 | | } |