Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / RequestTimeoutManager.cs / 1305376 / 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 ); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- SurrogateSelector.cs
- PolicyStatement.cs
- ImportOptions.cs
- LineServicesCallbacks.cs
- CreateParams.cs
- ReverseInheritProperty.cs
- OleDbPermission.cs
- TaskResultSetter.cs
- RegisteredDisposeScript.cs
- QilReplaceVisitor.cs
- EmptyCollection.cs
- ContentElement.cs
- EDesignUtil.cs
- RegistryConfigurationProvider.cs
- FormsAuthenticationTicket.cs
- XmlArrayItemAttributes.cs
- PlainXmlSerializer.cs
- EntityContainerEntitySet.cs
- DataGridItemCollection.cs
- SuppressMessageAttribute.cs
- SingleResultAttribute.cs
- RTLAwareMessageBox.cs
- StringFormat.cs
- BufferedGraphicsContext.cs
- DependencyObject.cs
- CustomErrorsSection.cs
- XmlHelper.cs
- SafeArrayRankMismatchException.cs
- Scene3D.cs
- ToolTip.cs
- ToolStripDropDown.cs
- SizeFConverter.cs
- MsmqIntegrationSecurityMode.cs
- PolyQuadraticBezierSegment.cs
- Button.cs
- SafeHandles.cs
- SystemWebSectionGroup.cs
- ResourceDisplayNameAttribute.cs
- WebConfigurationFileMap.cs
- SafeFileMapViewHandle.cs
- TemplateContent.cs
- WebScriptClientGenerator.cs
- precedingquery.cs
- TargetPerspective.cs
- CryptoHandle.cs
- UriWriter.cs
- DynamicILGenerator.cs
- ProtocolsConfiguration.cs
- MemberInfoSerializationHolder.cs
- RadioButton.cs
- KnownTypes.cs
- DataGridRelationshipRow.cs
- CmsInterop.cs
- GridViewCellAutomationPeer.cs
- SimpleWorkerRequest.cs
- ApplicationFileParser.cs
- COM2IManagedPerPropertyBrowsingHandler.cs
- Rfc2898DeriveBytes.cs
- InfoCardRSACryptoProvider.cs
- VectorAnimationBase.cs
- SqlGenerator.cs
- messageonlyhwndwrapper.cs
- CompareValidator.cs
- PagedDataSource.cs
- DiscoveryDocumentSearchPattern.cs
- XPathEmptyIterator.cs
- TimeStampChecker.cs
- ReflectionTypeLoadException.cs
- FrameAutomationPeer.cs
- wmiprovider.cs
- ObjectReaderCompiler.cs
- WorkflowServiceHost.cs
- RangeEnumerable.cs
- IntellisenseTextBox.designer.cs
- IconHelper.cs
- DelegateBodyWriter.cs
- HebrewCalendar.cs
- RuntimeCompatibilityAttribute.cs
- XXXInfos.cs
- RootBrowserWindowProxy.cs
- Boolean.cs
- MenuItemCollectionEditorDialog.cs
- ContentIterators.cs
- Validator.cs
- XsltLibrary.cs
- ProxyWebPartConnectionCollection.cs
- _CommandStream.cs
- KeySplineConverter.cs
- ListViewEditEventArgs.cs
- UIPermission.cs
- SqlReorderer.cs
- NavigationProperty.cs
- EntityDataSourceWrapperCollection.cs
- VideoDrawing.cs
- Win32.cs
- SqlConnectionString.cs
- UIElement.cs
- Site.cs
- DataListItem.cs
- EnumerableCollectionView.cs