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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.Xml;
using System.Diagnostics;
using System.Runtime;
using System.Threading;
public abstract class BodyWriter
{
bool isBuffered;
bool canWrite;
object thisLock;
protected BodyWriter(bool isBuffered)
{
this.isBuffered = isBuffered;
this.canWrite = true;
if (!this.isBuffered)
{
this.thisLock = new object();
}
}
public bool IsBuffered
{
get { return this.isBuffered; }
}
internal virtual bool IsEmpty
{
get { return false; }
}
internal virtual bool IsFault
{
get { return false; }
}
public BodyWriter CreateBufferedCopy(int maxBufferSize)
{
if (maxBufferSize < 0)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("maxBufferSize", maxBufferSize,
SR.GetString(SR.ValueMustBeNonNegative)));
if (this.isBuffered)
{
return this;
}
else
{
lock (this.thisLock)
{
if (!this.canWrite)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.BodyWriterCanOnlyBeWrittenOnce)));
this.canWrite = false;
}
BodyWriter bodyWriter = OnCreateBufferedCopy(maxBufferSize);
if (!bodyWriter.IsBuffered)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.BodyWriterReturnedIsNotBuffered)));
return bodyWriter;
}
}
protected virtual BodyWriter OnCreateBufferedCopy(int maxBufferSize)
{
return OnCreateBufferedCopy(maxBufferSize, XmlDictionaryReaderQuotas.Max);
}
internal BodyWriter OnCreateBufferedCopy(int maxBufferSize, XmlDictionaryReaderQuotas quotas)
{
XmlBuffer buffer = new XmlBuffer(maxBufferSize);
using (XmlDictionaryWriter writer = buffer.OpenSection(quotas))
{
writer.WriteStartElement("a");
OnWriteBodyContents(writer);
writer.WriteEndElement();
}
buffer.CloseSection();
buffer.Close();
return new BufferedBodyWriter(buffer);
}
protected abstract void OnWriteBodyContents(XmlDictionaryWriter writer);
protected virtual IAsyncResult OnBeginWriteBodyContents(XmlDictionaryWriter writer, AsyncCallback callback, object state)
{
return new OnWriteBodyContentsAsyncResult(writer, this, callback, state);
}
protected virtual void OnEndWriteBodyContents(IAsyncResult result)
{
OnWriteBodyContentsAsyncResult.End(result);
}
void EnsureWriteBodyContentsState(XmlDictionaryWriter writer)
{
if (writer == null)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("writer"));
if (!this.isBuffered)
{
lock (this.thisLock)
{
if (!this.canWrite)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.BodyWriterCanOnlyBeWrittenOnce)));
this.canWrite = false;
}
}
}
public void WriteBodyContents(XmlDictionaryWriter writer)
{
EnsureWriteBodyContentsState(writer);
OnWriteBodyContents(writer);
}
public IAsyncResult BeginWriteBodyContents(XmlDictionaryWriter writer, AsyncCallback callback, object state)
{
EnsureWriteBodyContentsState(writer);
return OnBeginWriteBodyContents(writer, callback, state);
}
public void EndWriteBodyContents(IAsyncResult result)
{
OnEndWriteBodyContents(result);
}
class BufferedBodyWriter : BodyWriter
{
XmlBuffer buffer;
public BufferedBodyWriter(XmlBuffer buffer)
: base(true)
{
this.buffer = buffer;
}
protected override void OnWriteBodyContents(XmlDictionaryWriter writer)
{
XmlDictionaryReader reader = this.buffer.GetReader(0);
using (reader)
{
reader.ReadStartElement();
while (reader.NodeType != XmlNodeType.EndElement)
{
writer.WriteNode(reader, false);
}
reader.ReadEndElement();
}
}
}
class OnWriteBodyContentsAsyncResult : ScheduleActionItemAsyncResult
{
BodyWriter bodyWriter;
XmlDictionaryWriter writer;
public OnWriteBodyContentsAsyncResult(XmlDictionaryWriter writer, BodyWriter bodyWriter, AsyncCallback callback, object state)
: base(callback, state)
{
Fx.Assert(bodyWriter != null, "bodyWriter should never be null");
this.writer = writer;
this.bodyWriter = bodyWriter;
Schedule();
}
protected override void OnDoWork()
{
this.bodyWriter.OnWriteBodyContents(this.writer);
}
}
}
}
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