Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XmlDownloadManager.cs / 1 / XmlDownloadManager.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Xml { using System; using System.IO; using System.Net; using System.Security; using System.Xml.Schema; using System.Collections; using System.Security.Policy; // // XmlDownloadManager // internal class XmlDownloadManager { Hashtable connections; internal Stream GetStream( Uri uri, ICredentials credentials ) { if ( uri.Scheme == "file" ) { return new FileStream( uri.LocalPath, FileMode.Open, FileAccess.Read, FileShare.Read, 1 ); } else { return GetNonFileStream( uri, credentials ); } } private Stream GetNonFileStream( Uri uri, ICredentials credentials ) { WebRequest req = WebRequest.Create( uri ); if ( credentials != null ) { req.Credentials = credentials; } WebResponse resp = req.GetResponse(); HttpWebRequest webReq = req as HttpWebRequest; if ( webReq != null ) { lock ( this ) { if ( connections == null ) { connections = new Hashtable(); } OpenedHost openedHost = (OpenedHost)connections[webReq.Address.Host]; if ( openedHost == null ) { openedHost = new OpenedHost(); } if ( openedHost.nonCachedConnectionsCount < webReq.ServicePoint.ConnectionLimit - 1 ) { // we are not close to connection limit -> don't cache the stream if ( openedHost.nonCachedConnectionsCount == 0 ) { connections.Add( webReq.Address.Host, openedHost ); } openedHost.nonCachedConnectionsCount++; return new XmlRegisteredNonCachedStream( resp.GetResponseStream(), this, webReq.Address.Host ); } else { // cache the stream and save the connection for the next request return new XmlCachedStream( resp.ResponseUri, resp.GetResponseStream() ); } } } else { return resp.GetResponseStream(); } } internal void Remove( string host ) { lock ( this ) { OpenedHost openedHost = (OpenedHost)connections[host]; if ( openedHost != null ) { if ( --openedHost.nonCachedConnectionsCount == 0 ) { connections.Remove( host ); } } } } } // // OpenedHost // internal class OpenedHost { internal int nonCachedConnectionsCount; } // // XmlRegisteredNonCachedStream // internal class XmlRegisteredNonCachedStream : Stream { protected Stream stream; XmlDownloadManager downloadManager; string host; internal XmlRegisteredNonCachedStream( Stream stream, XmlDownloadManager downloadManager, string host ) { this.stream = stream; this.downloadManager = downloadManager; this.host = host; } ~XmlRegisteredNonCachedStream() { if ( downloadManager != null ) { downloadManager.Remove( host ); } stream = null; // The base class, Stream, provides its own finalizer } protected override void Dispose( bool disposing ) { try { if ( disposing && stream != null ) { if ( downloadManager != null ) { downloadManager.Remove( host ); } stream.Close(); } stream = null; GC.SuppressFinalize( this ); // do not call finalizer } finally { base.Dispose( disposing ); } } // // Stream // public override IAsyncResult BeginRead( byte[] buffer, int offset, int count, AsyncCallback callback, object state ) { return stream.BeginRead( buffer, offset, count, callback, state ); } public override IAsyncResult BeginWrite( byte[] buffer, int offset, int count, AsyncCallback callback, object state ) { return BeginWrite( buffer, offset, count, callback, state ); } public override int EndRead( IAsyncResult asyncResult ) { return stream.EndRead( asyncResult ); } public override void EndWrite( IAsyncResult asyncResult ) { stream.EndWrite( asyncResult ); } public override void Flush() { stream.Flush(); } public override int Read( byte[] buffer, int offset, int count ) { return stream.Read( buffer, offset, count ); } public override int ReadByte() { return stream.ReadByte(); } public override long Seek( long offset, SeekOrigin origin ) { return stream.Seek( offset, origin ); } public override void SetLength( long value ) { stream.SetLength( value ); } public override void Write( byte[] buffer, int offset, int count ) { stream.Write( buffer, offset, count ); } public override void WriteByte( byte value ) { stream.WriteByte( value ); } public override Boolean CanRead { get { return stream.CanRead; } } public override Boolean CanSeek { get { return stream.CanSeek; } } public override Boolean CanWrite { get { return stream.CanWrite; } } public override long Length { get { return stream.Length; } } public override long Position { get { return stream.Position; } set { stream.Position = value; } } } // // XmlCachedStream // internal class XmlCachedStream : MemoryStream { private const int MoveBufferSize = 4096; private Uri uri; internal XmlCachedStream( Uri uri, Stream stream ) : base() { this.uri = uri; try { byte[] bytes = new byte[MoveBufferSize]; int read = 0; while ( ( read = stream.Read( bytes, 0, MoveBufferSize ) ) > 0 ) { this.Write( bytes, 0, read ); } base.Position = 0; } finally { stream.Close(); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- BezierSegment.cs
- TransformCollection.cs
- WebPartConnectVerb.cs
- EventLogPermission.cs
- MatrixAnimationUsingPath.cs
- XmlBoundElement.cs
- ForEachAction.cs
- SHA512.cs
- CategoryState.cs
- TextParaLineResult.cs
- SHA256CryptoServiceProvider.cs
- ThousandthOfEmRealDoubles.cs
- FilterElement.cs
- XmlHierarchyData.cs
- VariableAction.cs
- ApplicationFileParser.cs
- TextServicesCompartment.cs
- httpstaticobjectscollection.cs
- SamlSecurityToken.cs
- SortDescription.cs
- SqlUDTStorage.cs
- OleAutBinder.cs
- LinkedResource.cs
- HttpConfigurationContext.cs
- DebugView.cs
- Vector3DCollection.cs
- FixedDocumentSequencePaginator.cs
- TracePayload.cs
- ColorPalette.cs
- UpDownBase.cs
- SmiRequestExecutor.cs
- WinEventWrap.cs
- TextSimpleMarkerProperties.cs
- VirtualizedCellInfoCollection.cs
- URLString.cs
- LinqDataSourceInsertEventArgs.cs
- TrueReadOnlyCollection.cs
- DecoderBestFitFallback.cs
- ProfilePropertySettings.cs
- TypeListConverter.cs
- TextSimpleMarkerProperties.cs
- SpeechDetectedEventArgs.cs
- BitConverter.cs
- RegexParser.cs
- UIAgentAsyncParams.cs
- SqlIdentifier.cs
- UnsettableComboBox.cs
- FormViewPagerRow.cs
- OdbcConnection.cs
- ExpressionBindingCollection.cs
- RevocationPoint.cs
- Cursors.cs
- JapaneseCalendar.cs
- CompositeClientFormatter.cs
- MutexSecurity.cs
- MetadataPropertyAttribute.cs
- WindowClosedEventArgs.cs
- StateDesigner.TransitionInfo.cs
- ASCIIEncoding.cs
- DataBoundControlAdapter.cs
- ControlBindingsCollection.cs
- SqlIdentifier.cs
- MenuItem.cs
- CompositionTarget.cs
- Int16KeyFrameCollection.cs
- SimpleHandlerFactory.cs
- ElementHostAutomationPeer.cs
- ConfigXmlCDataSection.cs
- SR.cs
- InputLanguageCollection.cs
- ScriptRef.cs
- SqlMethodAttribute.cs
- ExpressionBuilderCollection.cs
- PreProcessor.cs
- RetrieveVirtualItemEventArgs.cs
- TextPenaltyModule.cs
- VisualBrush.cs
- EnumConverter.cs
- CodeIdentifier.cs
- ExecutionEngineException.cs
- WeakReferenceList.cs
- HtmlEmptyTagControlBuilder.cs
- EntityStoreSchemaFilterEntry.cs
- MouseEvent.cs
- ProxyWebPartManagerDesigner.cs
- _NtlmClient.cs
- WebPageTraceListener.cs
- PointCollection.cs
- TheQuery.cs
- Marshal.cs
- ButtonFieldBase.cs
- URLMembershipCondition.cs
- KeyToListMap.cs
- DataKeyCollection.cs
- XmlSerializationReader.cs
- JapaneseCalendar.cs
- Debug.cs
- ValidationErrorCollection.cs
- TreeViewItemAutomationPeer.cs
- XmlSchemaInferenceException.cs