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//----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.Runtime;
using System.ServiceModel.Dispatcher;
using System.Threading;
sealed class InternalDuplexChannelFactory : LayeredChannelFactory<IDuplexChannel>
{
static long channelCount = 0;
InputChannelDemuxer channelDemuxer;
IChannelFactory<IOutputChannel> innerChannelFactory;
IChannelListener<IInputChannel> innerChannelListener;
LocalAddressProvider localAddressProvider;
bool providesCorrelation;
internal InternalDuplexChannelFactory(InternalDuplexBindingElement bindingElement, BindingContext context,
InputChannelDemuxer channelDemuxer,
IChannelFactory<IOutputChannel> innerChannelFactory, LocalAddressProvider localAddressProvider)
: base(context.Binding, innerChannelFactory)
{
this.channelDemuxer = channelDemuxer;
this.innerChannelFactory = innerChannelFactory;
ChannelDemuxerFilter demuxFilter = new ChannelDemuxerFilter(new MatchNoneMessageFilter(), int.MinValue);
this.innerChannelListener = this.channelDemuxer.BuildChannelListener<IInputChannel>(demuxFilter);
this.localAddressProvider = localAddressProvider;
this.providesCorrelation = bindingElement.ProvidesCorrelation;
}
bool CreateUniqueLocalAddress(out EndpointAddress address, out int priority)
{
long tempChannelCount = Interlocked.Increment(ref channelCount);
if (tempChannelCount > 1)
{
AddressHeader uniqueEndpointHeader = AddressHeader.CreateAddressHeader(XD.UtilityDictionary.UniqueEndpointHeaderName,
XD.UtilityDictionary.UniqueEndpointHeaderNamespace, tempChannelCount);
address = new EndpointAddress(this.innerChannelListener.Uri, uniqueEndpointHeader);
priority = 1;
return true;
}
else
{
address = new EndpointAddress(this.innerChannelListener.Uri);
priority = 0;
return false;
}
}
protected override IDuplexChannel OnCreateChannel(EndpointAddress address, Uri via)
{
EndpointAddress localAddress;
int priority;
MessageFilter filter;
// determines whether the CompositeDuplex channels created from this factory expect the UniqueEndpoint (ChannelInstance) header in its messages
bool useUniqueHeader = false;
if (localAddressProvider != null)
{
localAddress = localAddressProvider.LocalAddress;
filter = localAddressProvider.Filter;
priority = localAddressProvider.Priority;
}
else
{
useUniqueHeader = CreateUniqueLocalAddress(out localAddress, out priority);
filter = new MatchAllMessageFilter();
}
return this.CreateChannel(address, via, localAddress, filter, priority, useUniqueHeader);
}
public IDuplexChannel CreateChannel(EndpointAddress address, Uri via, MessageFilter filter, int priority, bool usesUniqueHeader)
{
return this.CreateChannel(address, via, new EndpointAddress(this.innerChannelListener.Uri), filter, priority, usesUniqueHeader);
}
public IDuplexChannel CreateChannel(EndpointAddress remoteAddress, Uri via, EndpointAddress localAddress, MessageFilter filter, int priority, bool usesUniqueHeader)
{
ChannelDemuxerFilter demuxFilter = new ChannelDemuxerFilter(new AndMessageFilter(new EndpointAddressMessageFilter(localAddress, true), filter), priority);
IDuplexChannel newChannel = null;
IOutputChannel innerOutputChannel = null;
IChannelListener<IInputChannel> innerInputListener = null;
IInputChannel innerInputChannel = null;
try
{
innerOutputChannel = this.innerChannelFactory.CreateChannel(remoteAddress, via);
innerInputListener = this.channelDemuxer.BuildChannelListener<IInputChannel>(demuxFilter);
innerInputListener.Open();
innerInputChannel = innerInputListener.AcceptChannel();
newChannel = new ClientCompositeDuplexChannel(this, innerInputChannel, innerInputListener, localAddress, innerOutputChannel, usesUniqueHeader);
}
finally
{
if (newChannel == null) // need to cleanup
{
if (innerOutputChannel != null)
{
innerOutputChannel.Close();
}
if (innerInputListener != null)
{
innerInputListener.Close();
}
if (innerInputChannel != null)
{
innerInputChannel.Close();
}
}
}
return newChannel;
}
protected override void OnAbort()
{
base.OnAbort();
this.innerChannelListener.Abort();
}
protected override void OnOpen(TimeSpan timeout)
{
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
base.OnOpen(timeoutHelper.RemainingTime());
this.innerChannelListener.Open(timeoutHelper.RemainingTime());
}
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
{
return new ChainedOpenAsyncResult(timeout, callback, state, base.OnBeginOpen, base.OnEndOpen, this.innerChannelListener);
}
protected override void OnEndOpen(IAsyncResult result)
{
ChainedOpenAsyncResult.End(result);
}
protected override void OnClose(TimeSpan timeout)
{
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
base.OnClose(timeoutHelper.RemainingTime());
this.innerChannelListener.Close(timeoutHelper.RemainingTime());
}
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
{
return new ChainedCloseAsyncResult(timeout, callback, state, base.OnBeginClose, base.OnEndClose, this.innerChannelListener);
}
protected override void OnEndClose(IAsyncResult result)
{
ChainedCloseAsyncResult.End(result);
}
public override T GetProperty<T>()
{
if (typeof(T) == typeof(IChannelListener))
{
return (T)(object)innerChannelListener;
}
if (typeof(T) == typeof(ISecurityCapabilities) && !this.providesCorrelation)
{
return InternalDuplexBindingElement.GetSecurityCapabilities<T>(base.GetProperty<ISecurityCapabilities>());
}
T baseProperty = base.GetProperty<T>();
if (baseProperty != null)
{
return baseProperty;
}
IChannelListener channelListener = innerChannelListener;
if (channelListener != null)
{
return channelListener.GetProperty<T>();
}
else
{
return default(T);
}
}
class ClientCompositeDuplexChannel : LayeredDuplexChannel
{
IChannelListener<IInputChannel> innerInputListener;
bool usesUniqueHeader; // Perf optimization - don't check message headers if we know there's only one CompositeDuplexChannel created
public ClientCompositeDuplexChannel(ChannelManagerBase channelManager, IInputChannel innerInputChannel, IChannelListener<IInputChannel> innerInputListener, EndpointAddress localAddress, IOutputChannel innerOutputChannel, bool usesUniqueHeader)
: base(channelManager, innerInputChannel, localAddress, innerOutputChannel)
{
this.innerInputListener = innerInputListener;
this.usesUniqueHeader = usesUniqueHeader;
}
protected override void OnAbort()
{
base.OnAbort();
this.innerInputListener.Abort();
}
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
{
return new ChainedAsyncResult(timeout, callback, state, base.OnBeginClose, base.OnEndClose, this.innerInputListener.BeginClose, this.innerInputListener.EndClose);
}
protected override void OnClose(TimeSpan timeout)
{
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
base.OnClose(timeoutHelper.RemainingTime());
this.innerInputListener.Close(timeoutHelper.RemainingTime());
}
protected override void OnEndClose(IAsyncResult result)
{
ChainedAsyncResult.End(result);
}
protected override void OnReceive(Message message)
{
// Mark ChannelInstance header ref params as Understood on message
// MessageFilters will take care of proper routing of the message, but we need to mark it as understood here.
if (usesUniqueHeader)
{
// 3.0 allows for messages to be received with duplicate message headers; we cannot
// use MessageHeaders.FindHeader() to find the header because it will throw an exception
// if it encounters duplicate headers. We instead have to look through all headers.
for (int i = 0; i < message.Headers.Count; i++)
{
if (message.Headers[i].Name == XD.UtilityDictionary.UniqueEndpointHeaderName.Value &&
message.Headers[i].Namespace == XD.UtilityDictionary.UniqueEndpointHeaderNamespace.Value)
{
message.Headers.AddUnderstood(i);
}
}
}
}
}
}
}
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