Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / RequestTimeoutManager.cs / 3 / RequestTimeoutManager.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * Request timeout manager -- implements the request timeout mechanism */ namespace System.Web { using System.Threading; using System.Collections; using System.Web.Util; internal class RequestTimeoutManager { private int _requestCount; private DoubleLinkList[] _lists; // partitioned to avoid contention private int _currentList; private int _inProgressLock; // only 1 thread can be cancelling private readonly TimeSpan _timerPeriod = new TimeSpan(0, 0, 15); // 15 second init precision private Timer _timer; internal RequestTimeoutManager() { // initialize request lists _requestCount = 0; _lists = new DoubleLinkList[13]; for (int i = 0; i < _lists.Length; i++) _lists[i] = new DoubleLinkList(); _currentList = 0; // init lock _inProgressLock = 0; // create the timer #if DBG if (!Debug.IsTagPresent("Timer") || Debug.IsTagEnabled("Timer")) #endif { _timer = new Timer(new TimerCallback(this.TimerCompletionCallback), null, _timerPeriod, _timerPeriod); } } internal void Stop() { // stop the timer if (_timer != null) { ((IDisposable)_timer).Dispose(); _timer = null; } while (_inProgressLock != 0) Thread.Sleep(100); // cancel all cancelable requests if (_requestCount > 0) CancelTimedOutRequests(DateTime.UtcNow.AddYears(1)); // future date } private void TimerCompletionCallback(Object state) { if (_requestCount > 0) CancelTimedOutRequests(DateTime.UtcNow); } private void CancelTimedOutRequests(DateTime now) { // only one thread can be doing it if (Interlocked.CompareExchange(ref _inProgressLock, 1, 0) != 0) return; // collect them all into a separate list with minimal locking ArrayList entries = new ArrayList(_requestCount); // size can change DoubleLinkListEnumerator en; for (int i = 0; i < _lists.Length; i++) { lock (_lists[i]) { en = _lists[i].GetEnumerator(); while (en.MoveNext()) entries.Add(en.GetDoubleLink()); en = null; } } // walk through the collected list to timeout what's needed int n = entries.Count; for (int i = 0; i < n; i++) ((RequestTimeoutEntry)entries[i]).TimeoutIfNeeded(now); // this thread is done -- unlock Interlocked.Exchange(ref _inProgressLock, 0); } internal void Add(HttpContext context) { if (context.TimeoutLink != null) { ((RequestTimeoutEntry)context.TimeoutLink).IncrementCount(); return; } // create new entry RequestTimeoutEntry entry = new RequestTimeoutEntry(context); // add it to the list int i = _currentList++; if (i >= _lists.Length) { i = 0; _currentList = 0; } entry.AddToList(_lists[i]); Interlocked.Increment(ref _requestCount); // update HttpContext context.TimeoutLink = entry; } internal void Remove(HttpContext context) { RequestTimeoutEntry entry = (RequestTimeoutEntry)context.TimeoutLink; // remove from the list if (entry != null) { if( entry.DecrementCount() == 0 ) { entry.RemoveFromList(); Interlocked.Decrement(ref _requestCount); } else { return; } } // update HttpContext context.TimeoutLink = null; } private class RequestTimeoutEntry : DoubleLink { private HttpContext _context; // the request private DoubleLinkList _list; private int _count; internal RequestTimeoutEntry(HttpContext context) { _context = context; _count = 1; } internal void AddToList(DoubleLinkList list) { lock(list) { list.InsertTail(this); _list = list; } } internal void RemoveFromList() { if (_list != null) { lock(_list) { Remove(); _list = null; } } } internal void TimeoutIfNeeded(DateTime now) { Thread thread = _context.MustTimeout(now); if (thread != null) { RemoveFromList(); thread.Abort(new HttpApplication.CancelModuleException(true)); } } internal void IncrementCount() { Interlocked.Increment( ref _count ); } internal int DecrementCount() { return Interlocked.Decrement( ref _count ); } } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- GridViewRowEventArgs.cs
- WebPartConnectVerb.cs
- AndAlso.cs
- COM2ExtendedBrowsingHandler.cs
- SerializationObjectManager.cs
- SchemaRegistration.cs
- XappLauncher.cs
- TextDecorationCollectionConverter.cs
- ZipIOCentralDirectoryBlock.cs
- MappingSource.cs
- PeerCollaboration.cs
- StyleTypedPropertyAttribute.cs
- FileLevelControlBuilderAttribute.cs
- ListViewDeleteEventArgs.cs
- ExpandableObjectConverter.cs
- SerializableAttribute.cs
- HtmlInputText.cs
- NegotiateStream.cs
- RequiredArgumentAttribute.cs
- Object.cs
- EmptyEnumerator.cs
- Light.cs
- OracleDataAdapter.cs
- WebPartConnectionsEventArgs.cs
- TextTreeFixupNode.cs
- DispatcherExceptionFilterEventArgs.cs
- CircleHotSpot.cs
- EmptyWithCancelationCheckWorkItem.cs
- NullableDecimalMinMaxAggregationOperator.cs
- BamlLocalizableResource.cs
- MatchingStyle.cs
- ObjectDisposedException.cs
- ResourceDisplayNameAttribute.cs
- GridViewRow.cs
- UnsafeNativeMethodsTablet.cs
- ComboBoxAutomationPeer.cs
- LogicalMethodInfo.cs
- XPathDescendantIterator.cs
- SetIterators.cs
- CompilerInfo.cs
- MDIClient.cs
- DocumentReference.cs
- Vector3D.cs
- ResourceSetExpression.cs
- GeneralTransform.cs
- NodeFunctions.cs
- JournalNavigationScope.cs
- ContainerVisual.cs
- QueryStringParameter.cs
- FilteredAttributeCollection.cs
- TextElementEditingBehaviorAttribute.cs
- wmiprovider.cs
- TextBox.cs
- ProfileSettings.cs
- Rect.cs
- AQNBuilder.cs
- AttributeData.cs
- PersonalizationDictionary.cs
- ProtocolsConfigurationEntry.cs
- ExecutedRoutedEventArgs.cs
- ToolStripSettings.cs
- updatecommandorderer.cs
- SafeProcessHandle.cs
- CatalogPartDesigner.cs
- SslStream.cs
- CodeDOMUtility.cs
- CodeSpit.cs
- ProcessInputEventArgs.cs
- WebBrowserBase.cs
- ExpanderAutomationPeer.cs
- ButtonColumn.cs
- WebConvert.cs
- SeekStoryboard.cs
- QilInvokeEarlyBound.cs
- ReadOnlyAttribute.cs
- FieldInfo.cs
- TagMapCollection.cs
- DataErrorValidationRule.cs
- Application.cs
- MenuAdapter.cs
- ReachPrintTicketSerializer.cs
- XmlStringTable.cs
- SqlFileStream.cs
- DateTimeValueSerializer.cs
- Section.cs
- ThumbButtonInfo.cs
- MailDefinition.cs
- LocalBuilder.cs
- CharUnicodeInfo.cs
- assemblycache.cs
- FilteredReadOnlyMetadataCollection.cs
- PasswordBoxAutomationPeer.cs
- LassoSelectionBehavior.cs
- ArgumentReference.cs
- TrackingServices.cs
- RegistryConfigurationProvider.cs
- GridEntryCollection.cs
- TcpStreams.cs
- XmlAttribute.cs
- PartialCachingAttribute.cs