Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / xsp / System / Web / UI / PageAsyncTask.cs / 1 / PageAsyncTask.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.Collections; using System.Security; using System.Security.Permissions; using System.Threading; using System.Web; using System.Web.UI; using System.Web.Util; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class PageAsyncTask { private BeginEventHandler _beginHandler; private EndEventHandler _endHandler; private EndEventHandler _timeoutHandler; private Object _state; private bool _executeInParallel; private PageAsyncTaskManager _taskManager; private int _completionMethodLock; private bool _started; private bool _completed; private bool _completedSynchronously; private AsyncCallback _completionCallback; private IAsyncResult _asyncResult; private Exception _error; public PageAsyncTask(BeginEventHandler beginHandler, EndEventHandler endHandler, EndEventHandler timeoutHandler, Object state) : this(beginHandler, endHandler, timeoutHandler, state, false) { } public PageAsyncTask(BeginEventHandler beginHandler, EndEventHandler endHandler, EndEventHandler timeoutHandler, Object state, bool executeInParallel) { if (beginHandler == null) { throw new ArgumentNullException("beginHandler"); } if (endHandler == null) { throw new ArgumentNullException("endHandler"); } _beginHandler = beginHandler; _endHandler = endHandler; _timeoutHandler = timeoutHandler; _state = state; _executeInParallel = executeInParallel; } public BeginEventHandler BeginHandler { get { return _beginHandler; } } public EndEventHandler EndHandler { get { return _endHandler; } } public EndEventHandler TimeoutHandler { get { return _timeoutHandler; } } public Object State { get { return _state; } } public bool ExecuteInParallel { get { return _executeInParallel; } } internal bool Started { get { return _started; } } internal bool CompletedSynchronously { get { return _completedSynchronously; } } internal bool Completed { get { return _completed; } } internal IAsyncResult AsyncResult { get { return _asyncResult; } } internal Exception Error { get { return _error; } } internal void Start(PageAsyncTaskManager manager, Object source, EventArgs args) { Debug.Assert(!_started); _taskManager = manager; _completionCallback = new AsyncCallback(this.OnAsyncTaskCompletion); _started = true; Debug.Trace("Async", "Start task"); try { IAsyncResult ar = _beginHandler(source, args, _completionCallback, _state); if (ar == null) { throw new InvalidOperationException(SR.GetString(SR.Async_null_asyncresult)); } if (_asyncResult == null) { // _asyncResult could be not null if already completed _asyncResult = ar; } } catch (Exception e) { Debug.Trace("Async", "Task failed to start"); _error = e; _completed = true; _completedSynchronously = true; _taskManager.TaskCompleted(true /*onCallerThread*/); // notify TaskManager // it is ok to say false (onCallerThread) above because this kind of // error completion will never be the last in ResumeTasks() } } private void OnAsyncTaskCompletion(IAsyncResult ar) { Debug.Trace("Async", "Task completed, CompletedSynchronously=" + ar.CompletedSynchronously); if (_asyncResult == null) { // _asyncResult could be null if the code not yet returned from begin method _asyncResult = ar; } CompleteTask(false /*timedOut*/); } internal void ForceTimeout(bool syncCaller) { Debug.Trace("Async", "Task timed out"); CompleteTask(true /*timedOut*/, syncCaller /*syncTimeoutCaller*/); } private void CompleteTask(bool timedOut) { CompleteTask(timedOut, false /*syncTimeoutCaller*/); } private void CompleteTask(bool timedOut, bool syncTimeoutCaller) { if (Interlocked.Exchange(ref _completionMethodLock, 1) != 0) { return; } bool needSetupThreadContext; bool responseEnded = false; if (timedOut) { needSetupThreadContext = !syncTimeoutCaller; } else { _completedSynchronously = _asyncResult.CompletedSynchronously; needSetupThreadContext = !_completedSynchronously; } // call the completion or timeout handler // when neeeded setup the thread context and lock // catch and remember all exceptions HttpApplication app = _taskManager.Application; try { if (needSetupThreadContext) { lock (app) { HttpApplication.ThreadContext threadContext = null; try { threadContext = app.OnThreadEnter(); if (timedOut) { if (_timeoutHandler != null) { _timeoutHandler(_asyncResult); } } else { _endHandler(_asyncResult); } } finally { if (threadContext != null) { threadContext.Leave(); } } } } else { if (timedOut) { if (_timeoutHandler != null) { _timeoutHandler(_asyncResult); } } else { _endHandler(_asyncResult); } } } catch (ThreadAbortException e) { _error = e; HttpApplication.CancelModuleException exceptionState = e.ExceptionState as HttpApplication.CancelModuleException; // Is this from Response.End() if (exceptionState != null && !exceptionState.Timeout) { // Mark the request as completed lock (app) { // Handle response end once. Skip if already initiated (previous AsyncTask) if (!app.IsRequestCompleted) { responseEnded = true; app.CompleteRequest(); } } // Clear the error for Response.End _error = null; } // ---- the exception. Async completion required (DDB 140655) Thread.ResetAbort(); } catch (Exception e) { _error = e; } // Complete the current async task _completed = true; _taskManager.TaskCompleted(_completedSynchronously /*onCallerThread*/); // notify TaskManager // Wait for pending AsyncTasks (DDB 140655) if (responseEnded) { _taskManager.CompleteAllTasksNow(false /*syncCaller*/); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI { using System; using System.Collections; using System.Security; using System.Security.Permissions; using System.Threading; using System.Web; using System.Web.UI; using System.Web.Util; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class PageAsyncTask { private BeginEventHandler _beginHandler; private EndEventHandler _endHandler; private EndEventHandler _timeoutHandler; private Object _state; private bool _executeInParallel; private PageAsyncTaskManager _taskManager; private int _completionMethodLock; private bool _started; private bool _completed; private bool _completedSynchronously; private AsyncCallback _completionCallback; private IAsyncResult _asyncResult; private Exception _error; public PageAsyncTask(BeginEventHandler beginHandler, EndEventHandler endHandler, EndEventHandler timeoutHandler, Object state) : this(beginHandler, endHandler, timeoutHandler, state, false) { } public PageAsyncTask(BeginEventHandler beginHandler, EndEventHandler endHandler, EndEventHandler timeoutHandler, Object state, bool executeInParallel) { if (beginHandler == null) { throw new ArgumentNullException("beginHandler"); } if (endHandler == null) { throw new ArgumentNullException("endHandler"); } _beginHandler = beginHandler; _endHandler = endHandler; _timeoutHandler = timeoutHandler; _state = state; _executeInParallel = executeInParallel; } public BeginEventHandler BeginHandler { get { return _beginHandler; } } public EndEventHandler EndHandler { get { return _endHandler; } } public EndEventHandler TimeoutHandler { get { return _timeoutHandler; } } public Object State { get { return _state; } } public bool ExecuteInParallel { get { return _executeInParallel; } } internal bool Started { get { return _started; } } internal bool CompletedSynchronously { get { return _completedSynchronously; } } internal bool Completed { get { return _completed; } } internal IAsyncResult AsyncResult { get { return _asyncResult; } } internal Exception Error { get { return _error; } } internal void Start(PageAsyncTaskManager manager, Object source, EventArgs args) { Debug.Assert(!_started); _taskManager = manager; _completionCallback = new AsyncCallback(this.OnAsyncTaskCompletion); _started = true; Debug.Trace("Async", "Start task"); try { IAsyncResult ar = _beginHandler(source, args, _completionCallback, _state); if (ar == null) { throw new InvalidOperationException(SR.GetString(SR.Async_null_asyncresult)); } if (_asyncResult == null) { // _asyncResult could be not null if already completed _asyncResult = ar; } } catch (Exception e) { Debug.Trace("Async", "Task failed to start"); _error = e; _completed = true; _completedSynchronously = true; _taskManager.TaskCompleted(true /*onCallerThread*/); // notify TaskManager // it is ok to say false (onCallerThread) above because this kind of // error completion will never be the last in ResumeTasks() } } private void OnAsyncTaskCompletion(IAsyncResult ar) { Debug.Trace("Async", "Task completed, CompletedSynchronously=" + ar.CompletedSynchronously); if (_asyncResult == null) { // _asyncResult could be null if the code not yet returned from begin method _asyncResult = ar; } CompleteTask(false /*timedOut*/); } internal void ForceTimeout(bool syncCaller) { Debug.Trace("Async", "Task timed out"); CompleteTask(true /*timedOut*/, syncCaller /*syncTimeoutCaller*/); } private void CompleteTask(bool timedOut) { CompleteTask(timedOut, false /*syncTimeoutCaller*/); } private void CompleteTask(bool timedOut, bool syncTimeoutCaller) { if (Interlocked.Exchange(ref _completionMethodLock, 1) != 0) { return; } bool needSetupThreadContext; bool responseEnded = false; if (timedOut) { needSetupThreadContext = !syncTimeoutCaller; } else { _completedSynchronously = _asyncResult.CompletedSynchronously; needSetupThreadContext = !_completedSynchronously; } // call the completion or timeout handler // when neeeded setup the thread context and lock // catch and remember all exceptions HttpApplication app = _taskManager.Application; try { if (needSetupThreadContext) { lock (app) { HttpApplication.ThreadContext threadContext = null; try { threadContext = app.OnThreadEnter(); if (timedOut) { if (_timeoutHandler != null) { _timeoutHandler(_asyncResult); } } else { _endHandler(_asyncResult); } } finally { if (threadContext != null) { threadContext.Leave(); } } } } else { if (timedOut) { if (_timeoutHandler != null) { _timeoutHandler(_asyncResult); } } else { _endHandler(_asyncResult); } } } catch (ThreadAbortException e) { _error = e; HttpApplication.CancelModuleException exceptionState = e.ExceptionState as HttpApplication.CancelModuleException; // Is this from Response.End() if (exceptionState != null && !exceptionState.Timeout) { // Mark the request as completed lock (app) { // Handle response end once. Skip if already initiated (previous AsyncTask) if (!app.IsRequestCompleted) { responseEnded = true; app.CompleteRequest(); } } // Clear the error for Response.End _error = null; } // ---- the exception. Async completion required (DDB 140655) Thread.ResetAbort(); } catch (Exception e) { _error = e; } // Complete the current async task _completed = true; _taskManager.TaskCompleted(_completedSynchronously /*onCallerThread*/); // notify TaskManager // Wait for pending AsyncTasks (DDB 140655) if (responseEnded) { _taskManager.CompleteAllTasksNow(false /*syncCaller*/); } } } } // 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
- ProviderConnectionPointCollection.cs
- SignedXml.cs
- WindowsFormsHostPropertyMap.cs
- DataFieldConverter.cs
- OptionUsage.cs
- JsonReaderWriterFactory.cs
- ToolStripContainerActionList.cs
- SystemIPv4InterfaceProperties.cs
- LockCookie.cs
- OrthographicCamera.cs
- RelationshipDetailsRow.cs
- ExclusiveTcpTransportManager.cs
- CommandLibraryHelper.cs
- UdpChannelFactory.cs
- DrawingBrush.cs
- GregorianCalendarHelper.cs
- WebPartConnectionCollection.cs
- XPathPatternBuilder.cs
- DataSourceBooleanViewSchemaConverter.cs
- SHA512Managed.cs
- CodeArrayIndexerExpression.cs
- DynamicHyperLink.cs
- HttpCacheParams.cs
- GraphicsContainer.cs
- DataGridViewCellParsingEventArgs.cs
- ResourceExpressionBuilder.cs
- DataGridViewColumnEventArgs.cs
- _NetRes.cs
- SeekStoryboard.cs
- DocumentPageView.cs
- Ops.cs
- ActiveXSite.cs
- SqlWriter.cs
- SBCSCodePageEncoding.cs
- QuaternionKeyFrameCollection.cs
- TextTreeRootNode.cs
- BulletedList.cs
- WebHttpBinding.cs
- DataGridRowAutomationPeer.cs
- ValidatingPropertiesEventArgs.cs
- ItemDragEvent.cs
- NamespaceInfo.cs
- NameValueFileSectionHandler.cs
- TemplateComponentConnector.cs
- DayRenderEvent.cs
- Rect3DValueSerializer.cs
- ObjRef.cs
- PrintPreviewDialog.cs
- CodeActivityMetadata.cs
- ContentPlaceHolder.cs
- ConfigurationManagerHelper.cs
- _ChunkParse.cs
- DocumentGridContextMenu.cs
- InfoCardRSAOAEPKeyExchangeFormatter.cs
- SqlDataSourceAdvancedOptionsForm.cs
- ListViewInsertEventArgs.cs
- SHA512Cng.cs
- RemoteWebConfigurationHost.cs
- TypefaceMetricsCache.cs
- EntityDataSourceWizardForm.cs
- EditorAttribute.cs
- VirtualDirectoryMapping.cs
- SqlDataSource.cs
- NotImplementedException.cs
- Cursors.cs
- FreezableDefaultValueFactory.cs
- WebBrowserBase.cs
- PreservationFileWriter.cs
- KernelTypeValidation.cs
- XPathParser.cs
- EncryptedReference.cs
- SqlDataSourceStatusEventArgs.cs
- AnonymousIdentificationModule.cs
- BufferedGraphicsContext.cs
- ZipIOCentralDirectoryDigitalSignature.cs
- remotingproxy.cs
- ToolStripComboBox.cs
- DistributedTransactionPermission.cs
- EmbeddedObject.cs
- SymmetricAlgorithm.cs
- LabelLiteral.cs
- TiffBitmapEncoder.cs
- ScriptResourceAttribute.cs
- ObjectStateManager.cs
- RemotingServices.cs
- InkCanvas.cs
- Point4D.cs
- OneOfTypeConst.cs
- ColumnMapProcessor.cs
- QilStrConcatenator.cs
- CheckBoxBaseAdapter.cs
- InfocardClientCredentials.cs
- FontInfo.cs
- AssemblyAssociatedContentFileAttribute.cs
- ToolStripRenderEventArgs.cs
- SystemEvents.cs
- FlowDocument.cs
- CheckBoxList.cs
- FontFamilyIdentifier.cs
- MetadataArtifactLoaderCompositeFile.cs