Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / MS / Internal / IO / Packaging / ResponseStream.cs / 1 / ResponseStream.cs
//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2001
//
// File: ResponseStream.cs
//
// Description: Exists so that the gc lifetime for the container
// and the webresponse are shared.
//
// This wrapper is returned for any PackWebResponse satisified
// with a container. It ensures that the container lives until
// the stream is closed because we are unaware of the lifetime of
// the stream and the client is unaware of the existence of the
// container.
//
// Container is never closed because it may be used by other
// responses.
//
// History: 11/17/03 - brucemac - created
// 12/11/03 - brucemac - adapted from ResponseStream
// 15/10/04 - brucemac - adapted from ContainerResponseStream
//-----------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.IO;
using System.IO.Packaging; // for PackWebResponse
using MS.Utility;
using System.Windows;
namespace MS.Internal.IO.Packaging
{
///
/// Wrap returned stream so we can release the webresponse container when the stream is closed
///
internal class ResponseStream : Stream
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
///
/// Wraps PackWebResponse to ensure correct lifetime handling and stream length functionality
///
/// stream to read from (baseStream)
/// response
/// stream under the package
/// container to hold on to
internal ResponseStream(Stream s, PackWebResponse response, Stream owningStream, Package container)
{
Debug.Assert(container != null, "Logic error: use other constructor for full package request streams");
Debug.Assert(owningStream != null, "Logic error: use other constructor for full package request streams");
Init(s, response, owningStream, container);
}
///
/// Wraps stream returned by PackWebResponse to ensure correct lifetime handlingy
///
/// stream to read from (baseStream)
/// webresponse to close when we close
internal ResponseStream(Stream s, PackWebResponse response)
{
Init(s, response, null, null);
}
///
/// Wraps PackWebResponse to ensure correct lifetime handling and stream length functionality
///
/// stream to read from (baseStream)
/// stream under the container
/// response
/// container to hold on to
private void Init(Stream s, PackWebResponse response, Stream owningStream, Package container)
{
Debug.Assert(s != null, "Logic error: base stream cannot be null");
Debug.Assert(response != null, "Logic error: response cannot be null");
_innerStream = s;
_response = response;
_owningStream = owningStream;
_container = container;
}
//------------------------------------------------------
//
// 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
///
/// Blocks until data is available.
/// The read semantics, and in particular the restoration of the position in case of an
/// exception, is implemented by the inner stream, i.e. the stream returned by PackWebResponse.
///
public override int Read(byte[] buffer, int offset, int count)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.GuidFromId(EventTraceGuidId.DRXREADSTREAMGUID), EventType.StartEvent, count);
}
CheckDisposed();
int rslt = _innerStream.Read(buffer, offset, count);
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.GuidFromId(EventTraceGuidId.DRXREADSTREAMGUID), EventType.EndEvent, rslt);
}
return rslt;
}
///
/// Seek
///
/// only zero is supported
/// only SeekOrigin.Begin is supported
/// zero
public override long Seek(long offset, SeekOrigin origin)
{
CheckDisposed();
return _innerStream.Seek(offset, origin);
}
///
/// SetLength
///
/// not supported
public override void SetLength(long newLength)
{
CheckDisposed();
_innerStream.SetLength(newLength);
}
///
/// Write
///
/// not supported
public override void Write(byte[] buf, int offset, int count)
{
CheckDisposed();
_innerStream.Write(buf, offset, count);
}
///
/// Flush
///
/// not supported
public override void Flush()
{
CheckDisposed();
_innerStream.Flush();
}
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
///
/// Is stream readable?
///
public override bool CanRead
{
get
{
return (!_closed && _innerStream.CanRead);
}
}
///
/// Is stream seekable?
///
/// We MUST support seek as this is used to implement ILockBytes.ReadAt()
public override bool CanSeek
{
get
{
return (!_closed && _innerStream.CanSeek);
}
}
///
/// Is stream writeable?
///
public override bool CanWrite
{
get
{
return (!_closed && _innerStream.CanWrite);
}
}
///
/// Logical byte position in this stream
///
public override long Position
{
get
{
CheckDisposed();
return _innerStream.Position;
}
set
{
CheckDisposed();
_innerStream.Position = value;
}
}
///
/// Length
///
public override long Length
{
get
{
CheckDisposed();
// inner stream should always know its length because it's based on a local file
// or because it's on a NetStream that can fake this
return _innerStream.Length;
}
}
//-----------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
protected override void Dispose(bool disposing)
{
try
{
if (disposing && !_closed)
{
#if DEBUG
if (PackWebRequestFactory._traceSwitch.Enabled)
System.Diagnostics.Trace.TraceInformation("ContainerResponseStream.Dispose(bool)");
#endif
_container = null;
// close the Part or NetStream
_innerStream.Close();
if (_owningStream != null)
{
// in this case, the innerStream was the part so this is the NetStream
_owningStream.Close();
}
}
}
finally
{
_innerStream = null;
_owningStream = null;
_response = null;
_closed = true;
base.Dispose(disposing);
}
}
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
private void CheckDisposed()
{
if (_closed)
throw new ObjectDisposedException("ResponseStream");
}
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
private bool _closed; // prevent recursion
private Stream _innerStream; // stream we are emulating
private Package _container; // container to release when we are closed
private Stream _owningStream; // stream under the _innerStream when opening a Part
private PackWebResponse _response; // packWebResponse we can consult for reliable length
}
}
// 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: ResponseStream.cs
//
// Description: Exists so that the gc lifetime for the container
// and the webresponse are shared.
//
// This wrapper is returned for any PackWebResponse satisified
// with a container. It ensures that the container lives until
// the stream is closed because we are unaware of the lifetime of
// the stream and the client is unaware of the existence of the
// container.
//
// Container is never closed because it may be used by other
// responses.
//
// History: 11/17/03 - brucemac - created
// 12/11/03 - brucemac - adapted from ResponseStream
// 15/10/04 - brucemac - adapted from ContainerResponseStream
//-----------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.IO;
using System.IO.Packaging; // for PackWebResponse
using MS.Utility;
using System.Windows;
namespace MS.Internal.IO.Packaging
{
///
/// Wrap returned stream so we can release the webresponse container when the stream is closed
///
internal class ResponseStream : Stream
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
///
/// Wraps PackWebResponse to ensure correct lifetime handling and stream length functionality
///
/// stream to read from (baseStream)
/// response
/// stream under the package
/// container to hold on to
internal ResponseStream(Stream s, PackWebResponse response, Stream owningStream, Package container)
{
Debug.Assert(container != null, "Logic error: use other constructor for full package request streams");
Debug.Assert(owningStream != null, "Logic error: use other constructor for full package request streams");
Init(s, response, owningStream, container);
}
///
/// Wraps stream returned by PackWebResponse to ensure correct lifetime handlingy
///
/// stream to read from (baseStream)
/// webresponse to close when we close
internal ResponseStream(Stream s, PackWebResponse response)
{
Init(s, response, null, null);
}
///
/// Wraps PackWebResponse to ensure correct lifetime handling and stream length functionality
///
/// stream to read from (baseStream)
/// stream under the container
/// response
/// container to hold on to
private void Init(Stream s, PackWebResponse response, Stream owningStream, Package container)
{
Debug.Assert(s != null, "Logic error: base stream cannot be null");
Debug.Assert(response != null, "Logic error: response cannot be null");
_innerStream = s;
_response = response;
_owningStream = owningStream;
_container = container;
}
//------------------------------------------------------
//
// 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
///
/// Blocks until data is available.
/// The read semantics, and in particular the restoration of the position in case of an
/// exception, is implemented by the inner stream, i.e. the stream returned by PackWebResponse.
///
public override int Read(byte[] buffer, int offset, int count)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.GuidFromId(EventTraceGuidId.DRXREADSTREAMGUID), EventType.StartEvent, count);
}
CheckDisposed();
int rslt = _innerStream.Read(buffer, offset, count);
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.GuidFromId(EventTraceGuidId.DRXREADSTREAMGUID), EventType.EndEvent, rslt);
}
return rslt;
}
///
/// Seek
///
/// only zero is supported
/// only SeekOrigin.Begin is supported
/// zero
public override long Seek(long offset, SeekOrigin origin)
{
CheckDisposed();
return _innerStream.Seek(offset, origin);
}
///
/// SetLength
///
/// not supported
public override void SetLength(long newLength)
{
CheckDisposed();
_innerStream.SetLength(newLength);
}
///
/// Write
///
/// not supported
public override void Write(byte[] buf, int offset, int count)
{
CheckDisposed();
_innerStream.Write(buf, offset, count);
}
///
/// Flush
///
/// not supported
public override void Flush()
{
CheckDisposed();
_innerStream.Flush();
}
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
///
/// Is stream readable?
///
public override bool CanRead
{
get
{
return (!_closed && _innerStream.CanRead);
}
}
///
/// Is stream seekable?
///
/// We MUST support seek as this is used to implement ILockBytes.ReadAt()
public override bool CanSeek
{
get
{
return (!_closed && _innerStream.CanSeek);
}
}
///
/// Is stream writeable?
///
public override bool CanWrite
{
get
{
return (!_closed && _innerStream.CanWrite);
}
}
///
/// Logical byte position in this stream
///
public override long Position
{
get
{
CheckDisposed();
return _innerStream.Position;
}
set
{
CheckDisposed();
_innerStream.Position = value;
}
}
///
/// Length
///
public override long Length
{
get
{
CheckDisposed();
// inner stream should always know its length because it's based on a local file
// or because it's on a NetStream that can fake this
return _innerStream.Length;
}
}
//-----------------------------------------------------
//
// Protected Methods
//
//------------------------------------------------------
protected override void Dispose(bool disposing)
{
try
{
if (disposing && !_closed)
{
#if DEBUG
if (PackWebRequestFactory._traceSwitch.Enabled)
System.Diagnostics.Trace.TraceInformation("ContainerResponseStream.Dispose(bool)");
#endif
_container = null;
// close the Part or NetStream
_innerStream.Close();
if (_owningStream != null)
{
// in this case, the innerStream was the part so this is the NetStream
_owningStream.Close();
}
}
}
finally
{
_innerStream = null;
_owningStream = null;
_response = null;
_closed = true;
base.Dispose(disposing);
}
}
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
private void CheckDisposed()
{
if (_closed)
throw new ObjectDisposedException("ResponseStream");
}
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
private bool _closed; // prevent recursion
private Stream _innerStream; // stream we are emulating
private Package _container; // container to release when we are closed
private Stream _owningStream; // stream under the _innerStream when opening a Part
private PackWebResponse _response; // packWebResponse we can consult for reliable length
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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