Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Shared / MS / Internal / IO / SynchronizingStream.cs / 1 / SynchronizingStream.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2001 // // File: SynchronizingStream.cs // // Description: Stream that locks on given syncRoot before entering any public API's. // // History: 01/20/06 - brucemac - created //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.IO; using System.Windows; namespace MS.Internal.IO.Packaging { ////// Wrap returned stream to protect non-thread-safe API's from race conditions /// internal class SynchronizingStream : Stream { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- ////// Serializes access by locking on the given object /// /// stream to read from (baseStream) /// object to lock on internal SynchronizingStream(Stream stream, Object syncRoot) { if (stream == null) throw new ArgumentNullException("stream"); if (syncRoot == null) throw new ArgumentNullException("syncRoot"); _baseStream = stream; _syncRoot = syncRoot; } //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- ////// Return the bytes requested /// /// destination buffer /// offset to write into that buffer /// how many bytes requested ///how many bytes were written into buffer public override int Read(byte[] buffer, int offset, int count) { lock (_syncRoot) { CheckDisposed(); return (_baseStream.Read(buffer, offset, count)); } } ////// Read a single byte /// ///The unsigned byte cast to an Int32, or -1 if at the end of the stream. public override int ReadByte() { lock (_syncRoot) { CheckDisposed(); return (_baseStream.ReadByte()); } } ////// Write a single byte /// /// byte to write public override void WriteByte(byte b) { lock (_syncRoot) { CheckDisposed(); _baseStream.WriteByte(b); } } ////// Seek /// /// only zero is supported /// only SeekOrigin.Begin is supported ///zero public override long Seek(long offset, SeekOrigin origin) { lock (_syncRoot) { CheckDisposed(); return _baseStream.Seek(offset, origin); } } ////// SetLength /// ///not supported public override void SetLength(long newLength) { lock (_syncRoot) { CheckDisposed(); _baseStream.SetLength(newLength); } } ////// Write /// ///not supported public override void Write(byte[] buf, int offset, int count) { lock (_syncRoot) { CheckDisposed(); _baseStream.Write(buf, offset, count); } } ////// Flush /// ///not supported public override void Flush() { lock (_syncRoot) { CheckDisposed(); _baseStream.Flush(); } } //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ ////// Is stream readable? /// public override bool CanRead { get { lock (_syncRoot) { return ((_baseStream != null) && _baseStream.CanRead); } } } ////// Is stream seekable? /// ///We MUST support seek as this is used to implement ILockBytes.ReadAt() public override bool CanSeek { get { lock (_syncRoot) { return ((_baseStream != null) && _baseStream.CanSeek); } } } ////// Is stream writeable? /// public override bool CanWrite { get { lock (_syncRoot) { return ((_baseStream != null) && _baseStream.CanWrite); } } } ////// Logical byte position in this stream /// public override long Position { get { lock (_syncRoot) { CheckDisposed(); return _baseStream.Position; } } set { lock (_syncRoot) { CheckDisposed(); _baseStream.Position = value; } } } ////// Length /// public override long Length { get { lock (_syncRoot) { CheckDisposed(); return _baseStream.Length; } } } //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ protected override void Dispose(bool disposing) { lock (_syncRoot) { try { if (disposing && (_baseStream != null)) { // close the underlying Stream _baseStream.Close(); // NOTE: We cannot set _syncRoot to null because it is used // on entry to every public method and property. } } finally { base.Dispose(disposing); _baseStream = null; } } } //----------------------------------------------------- // // Private Methods // //----------------------------------------------------- ////// CheckDisposed /// ///Pre-condition that lock has been acquired. private void CheckDisposed() { if (_baseStream == null) throw new ObjectDisposedException("Stream"); } //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ private Stream _baseStream; // stream we are wrapping private Object _syncRoot; // object to lock on } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2001 // // File: SynchronizingStream.cs // // Description: Stream that locks on given syncRoot before entering any public API's. // // History: 01/20/06 - brucemac - created //----------------------------------------------------------------------------- using System; using System.Diagnostics; using System.IO; using System.Windows; namespace MS.Internal.IO.Packaging { ////// Wrap returned stream to protect non-thread-safe API's from race conditions /// internal class SynchronizingStream : Stream { //----------------------------------------------------- // // Constructors // //----------------------------------------------------- ////// Serializes access by locking on the given object /// /// stream to read from (baseStream) /// object to lock on internal SynchronizingStream(Stream stream, Object syncRoot) { if (stream == null) throw new ArgumentNullException("stream"); if (syncRoot == null) throw new ArgumentNullException("syncRoot"); _baseStream = stream; _syncRoot = syncRoot; } //------------------------------------------------------ // // Public Methods // //----------------------------------------------------- ////// Return the bytes requested /// /// destination buffer /// offset to write into that buffer /// how many bytes requested ///how many bytes were written into buffer public override int Read(byte[] buffer, int offset, int count) { lock (_syncRoot) { CheckDisposed(); return (_baseStream.Read(buffer, offset, count)); } } ////// Read a single byte /// ///The unsigned byte cast to an Int32, or -1 if at the end of the stream. public override int ReadByte() { lock (_syncRoot) { CheckDisposed(); return (_baseStream.ReadByte()); } } ////// Write a single byte /// /// byte to write public override void WriteByte(byte b) { lock (_syncRoot) { CheckDisposed(); _baseStream.WriteByte(b); } } ////// Seek /// /// only zero is supported /// only SeekOrigin.Begin is supported ///zero public override long Seek(long offset, SeekOrigin origin) { lock (_syncRoot) { CheckDisposed(); return _baseStream.Seek(offset, origin); } } ////// SetLength /// ///not supported public override void SetLength(long newLength) { lock (_syncRoot) { CheckDisposed(); _baseStream.SetLength(newLength); } } ////// Write /// ///not supported public override void Write(byte[] buf, int offset, int count) { lock (_syncRoot) { CheckDisposed(); _baseStream.Write(buf, offset, count); } } ////// Flush /// ///not supported public override void Flush() { lock (_syncRoot) { CheckDisposed(); _baseStream.Flush(); } } //------------------------------------------------------ // // Public Properties // //------------------------------------------------------ ////// Is stream readable? /// public override bool CanRead { get { lock (_syncRoot) { return ((_baseStream != null) && _baseStream.CanRead); } } } ////// Is stream seekable? /// ///We MUST support seek as this is used to implement ILockBytes.ReadAt() public override bool CanSeek { get { lock (_syncRoot) { return ((_baseStream != null) && _baseStream.CanSeek); } } } ////// Is stream writeable? /// public override bool CanWrite { get { lock (_syncRoot) { return ((_baseStream != null) && _baseStream.CanWrite); } } } ////// Logical byte position in this stream /// public override long Position { get { lock (_syncRoot) { CheckDisposed(); return _baseStream.Position; } } set { lock (_syncRoot) { CheckDisposed(); _baseStream.Position = value; } } } ////// Length /// public override long Length { get { lock (_syncRoot) { CheckDisposed(); return _baseStream.Length; } } } //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ protected override void Dispose(bool disposing) { lock (_syncRoot) { try { if (disposing && (_baseStream != null)) { // close the underlying Stream _baseStream.Close(); // NOTE: We cannot set _syncRoot to null because it is used // on entry to every public method and property. } } finally { base.Dispose(disposing); _baseStream = null; } } } //----------------------------------------------------- // // Private Methods // //----------------------------------------------------- ////// CheckDisposed /// ///Pre-condition that lock has been acquired. private void CheckDisposed() { if (_baseStream == null) throw new ObjectDisposedException("Stream"); } //----------------------------------------------------- // // Private Fields // //------------------------------------------------------ private Stream _baseStream; // stream we are wrapping private Object _syncRoot; // object to lock on } } // 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
- ActivityBindForm.Designer.cs
- WinFormsSpinner.cs
- TaiwanCalendar.cs
- FileSystemInfo.cs
- ListBase.cs
- StateItem.cs
- NamedPipeProcessProtocolHandler.cs
- MarkupProperty.cs
- DocumentAutomationPeer.cs
- EdmValidator.cs
- FacetValueContainer.cs
- JavaScriptSerializer.cs
- VersionedStream.cs
- OdbcConnectionStringbuilder.cs
- SoapServerMethod.cs
- StringBlob.cs
- coordinatorscratchpad.cs
- Point3DAnimation.cs
- IconHelper.cs
- CodeBlockBuilder.cs
- SvcMapFileLoader.cs
- UshortList2.cs
- StructuredTypeInfo.cs
- EntityEntry.cs
- SplayTreeNode.cs
- ObjectViewListener.cs
- DrawingCollection.cs
- SyndicationFeed.cs
- FileUpload.cs
- DependencyObjectPropertyDescriptor.cs
- MarshalDirectiveException.cs
- IteratorFilter.cs
- HttpClientCertificate.cs
- IResourceProvider.cs
- ListViewItem.cs
- MenuAdapter.cs
- TreeView.cs
- InstanceCreationEditor.cs
- TracingConnectionInitiator.cs
- ToolStripDropTargetManager.cs
- JsonReader.cs
- DataGridItemEventArgs.cs
- ToolStripPanelRow.cs
- DataGridViewRowHeaderCell.cs
- Registry.cs
- SizeAnimationClockResource.cs
- BackStopAuthenticationModule.cs
- OracleBFile.cs
- FrameworkElement.cs
- UnknownBitmapEncoder.cs
- Events.cs
- ComplusEndpointConfigContainer.cs
- DataSourceProvider.cs
- DataTableClearEvent.cs
- SrgsSubset.cs
- SqlWriter.cs
- PersonalizationProviderHelper.cs
- JsonWriter.cs
- XmlSchemaSimpleTypeRestriction.cs
- XamlWrappingReader.cs
- TextModifier.cs
- PropagationProtocolsTracing.cs
- StatusBarItemAutomationPeer.cs
- WebPartChrome.cs
- CommonObjectSecurity.cs
- PenThread.cs
- SchemaCollectionCompiler.cs
- Renderer.cs
- XPathNavigator.cs
- RegistryDataKey.cs
- SafeRegistryKey.cs
- ComPlusServiceLoader.cs
- LongTypeConverter.cs
- BasicDesignerLoader.cs
- SqlDuplicator.cs
- WindowsFormsHostAutomationPeer.cs
- Viewport2DVisual3D.cs
- ImageField.cs
- FontStretchConverter.cs
- WebPartConnectVerb.cs
- DataGridViewAdvancedBorderStyle.cs
- URLString.cs
- ReadWriteSpinLock.cs
- LazyInitializer.cs
- MinimizableAttributeTypeConverter.cs
- BamlBinaryWriter.cs
- SqlDataReaderSmi.cs
- Listbox.cs
- XmlAnyAttributeAttribute.cs
- FusionWrap.cs
- AsyncStreamReader.cs
- HwndSource.cs
- ObfuscateAssemblyAttribute.cs
- HandleCollector.cs
- CachedTypeface.cs
- SafeEventLogReadHandle.cs
- DbConnectionStringBuilder.cs
- DataGridTable.cs
- DbException.cs
- NegotiationTokenAuthenticatorState.cs