Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Internal / IO / SynchronizingStream.cs / 1305600 / 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.
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