Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / SecureProtocols / _HelperAsyncResults.cs / 1 / _HelperAsyncResults.cs
/*++ Copyright (c) 2000 Microsoft Corporation Module Name: _HelperAsyncResults.cs Abstract: These are simple helpers to keep track of protocol IO requests Author: Alexei Vopilov Aug 18 2003 Revision History: --*/ namespace System.Net { using System; using System.IO; using System.Threading; // // Simply said whenever we want to wrap a user IO request we need // to preserve the original request buffer & sizes. // // Usually we would return this class as IAsyncResult to application // internal class BufferAsyncResult: LazyAsyncResult { public byte[] Buffer; public BufferOffsetSize[] Buffers; public int Offset; public int Count; public bool IsWrite; // MultipleWriteOnly // public BufferAsyncResult(object asyncObject, BufferOffsetSize[] buffers, object asyncState, AsyncCallback asyncCallback) :base (asyncObject, asyncState, asyncCallback) { Buffers = buffers; IsWrite = true; } public BufferAsyncResult(object asyncObject, byte[] buffer, int offset, int count, object asyncState, AsyncCallback asyncCallback) :this(asyncObject, buffer, offset, count, false, asyncState, asyncCallback) { } public BufferAsyncResult(object asyncObject, byte[] buffer, int offset, int count, bool isWrite, object asyncState, AsyncCallback asyncCallback) :base (asyncObject, asyncState, asyncCallback) { Buffer = buffer; Offset = offset; Count = count; IsWrite = isWrite; } } // The callback type used with below AsyncProtocolRequest class internal delegate void AsyncProtocolCallback(AsyncProtocolRequest asyncRequest); // // The class mimics LazyAsyncResult although it does not need to be thread safe nor it does need an Event. // Usually we would use this class to implement iterative protocol logic // // The beauty is that // 1) it can be reused for handshake-like or multi-IO request protocols // 2) it is proven to not block async IO since there is NO event handler exposed // // UserAsyncResult property is a link into original user IO request (could be a BufferAsyncResult). // When underlined protocol is done this guy gets completed // internal class AsyncProtocolRequest { #if DEBUG internal object _DebugAsyncChain; // Optionally used to track chains of async calls. #endif private AsyncProtocolCallback _Callback; private int _CompletionStatus; const int StatusNotStarted = 0; const int StatusCompleted = 1; const int StatusCheckedOnSyncCompletion = 2; public LazyAsyncResult UserAsyncResult; public int Result; // it's always about read bytes or alike public object AsyncState; // sometime it's needed to communicate additional info. // Note that AsyncObject is just a link to UserAsyncResult.AsyncObject public byte[] Buffer; // temp buffer reused by a protocol. public int Offset; // ditto public int Count; // ditto // // public AsyncProtocolRequest(LazyAsyncResult userAsyncResult) { GlobalLog.Assert(userAsyncResult != null, "AsyncProtocolRequest()|userAsyncResult == null"); GlobalLog.Assert(!userAsyncResult.InternalPeekCompleted, "AsyncProtocolRequest()|userAsyncResult is already completed."); UserAsyncResult = userAsyncResult; } // // public void SetNextRequest(byte[] buffer, int offset, int count, AsyncProtocolCallback callback) { if (_CompletionStatus != StatusNotStarted) throw new InternalException(); // pending op is in progress Buffer = buffer; Offset = offset; Count = count; _Callback = callback; } // // internal object AsyncObject { get { return UserAsyncResult.AsyncObject; } } // // Notify protocol so a next stage could be started // internal void CompleteRequest(int result) { Result = result; int status = Interlocked.Exchange(ref _CompletionStatus, StatusCompleted); if (status == StatusCompleted) throw new InternalException(); // only allow one call if (status == StatusCheckedOnSyncCompletion) { _CompletionStatus = StatusNotStarted; _Callback(this); } } // public bool MustCompleteSynchronously { get { int status = Interlocked.Exchange(ref _CompletionStatus, StatusCheckedOnSyncCompletion); if (status == StatusCheckedOnSyncCompletion) throw new InternalException(); // only allow one call if (status == StatusCompleted) { _CompletionStatus = StatusNotStarted; return true; } return false; } } // // NB: This will abandon _Callback and directly notify UserAsyncResult. // internal void CompleteWithError(Exception e) { UserAsyncResult.InvokeCallback(e); } // internal void CompleteUser() { UserAsyncResult.InvokeCallback(); } // internal void CompleteUser(object userResult) { UserAsyncResult.InvokeCallback(userResult); } // internal bool IsUserCompleted { get {return UserAsyncResult.InternalPeekCompleted;} } } }
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ValidatorCompatibilityHelper.cs
- TreeNodeStyle.cs
- StandardToolWindows.cs
- Certificate.cs
- Funcletizer.cs
- SortDescription.cs
- BackgroundWorker.cs
- VirtualPathUtility.cs
- EmptyStringExpandableObjectConverter.cs
- XmlDigitalSignatureProcessor.cs
- SharingService.cs
- AppendHelper.cs
- GeneralTransform3DTo2D.cs
- SqlTriggerContext.cs
- XmlSchemas.cs
- HttpProfileGroupBase.cs
- TargetPerspective.cs
- LogEntrySerializer.cs
- DocumentPageView.cs
- SqlDataSource.cs
- InkPresenterAutomationPeer.cs
- Int64AnimationBase.cs
- FileDataSourceCache.cs
- WebPartDescriptionCollection.cs
- DesigntimeLicenseContextSerializer.cs
- WebMessageBodyStyleHelper.cs
- IChannel.cs
- ServiceModelActivationSectionGroup.cs
- WorkflowWebService.cs
- XmlAnyAttributeAttribute.cs
- DataGrid.cs
- ResourceManager.cs
- XPathNodePointer.cs
- CroppedBitmap.cs
- TextPenaltyModule.cs
- CodeBinaryOperatorExpression.cs
- CommunicationObjectFaultedException.cs
- DataListItemCollection.cs
- DocumentSequence.cs
- PolyQuadraticBezierSegmentFigureLogic.cs
- ManualResetEvent.cs
- SectionXmlInfo.cs
- ErrorsHelper.cs
- HtmlValidationSummaryAdapter.cs
- CheckBoxPopupAdapter.cs
- DataSourceExpression.cs
- ExtendedProperty.cs
- OdbcConnection.cs
- Span.cs
- ShaderEffect.cs
- infer.cs
- MemberBinding.cs
- FormViewPagerRow.cs
- HtmlWindowCollection.cs
- XPathMultyIterator.cs
- StringReader.cs
- PriorityItem.cs
- BamlRecords.cs
- SByte.cs
- RequestDescription.cs
- HybridDictionary.cs
- EventProviderWriter.cs
- InputLanguageCollection.cs
- ExceptionWrapper.cs
- DesignerVerbCollection.cs
- StorageEntitySetMapping.cs
- CompModSwitches.cs
- XmlILConstructAnalyzer.cs
- CorePropertiesFilter.cs
- EventMappingSettings.cs
- DataGridViewCellErrorTextNeededEventArgs.cs
- CurrencyManager.cs
- ImageBrush.cs
- ThumbButtonInfo.cs
- WindowsGraphics2.cs
- Filter.cs
- RightsManagementEncryptedStream.cs
- SqlClientPermission.cs
- UniformGrid.cs
- StackSpiller.Bindings.cs
- SqlVisitor.cs
- FixedSOMSemanticBox.cs
- AnnotationComponentChooser.cs
- ArrayList.cs
- SelectionProcessor.cs
- ProfileInfo.cs
- PerformanceCounterLib.cs
- DataControlLinkButton.cs
- XmlSortKey.cs
- _SslStream.cs
- documentsequencetextview.cs
- FileClassifier.cs
- ArrowControl.xaml.cs
- ParameterRetriever.cs
- InvalidAsynchronousStateException.cs
- WebReferencesBuildProvider.cs
- XmlExtensionFunction.cs
- webbrowsersite.cs
- Messages.cs
- ObjectSet.cs