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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Channels
{
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime;
using System.ServiceModel;
using System.ServiceModel.Diagnostics.Application;
// Track channels and (optionally) associated state
class ChannelTracker<TChannel, TState> : CommunicationObject
where TChannel : IChannel
where TState : class
{
Dictionary<TChannel, TState> receivers;
EventHandler onInnerChannelClosed;
EventHandler onInnerChannelFaulted;
public ChannelTracker()
{
this.receivers = new Dictionary<TChannel, TState>();
this.onInnerChannelClosed = new EventHandler(OnInnerChannelClosed);
this.onInnerChannelFaulted = new EventHandler(OnInnerChannelFaulted);
}
public void Add(TChannel channel, TState channelReceiver)
{
bool abortChannel = false;
lock (this.receivers)
{
if (this.State != CommunicationState.Opened)
{
abortChannel = true;
}
else
{
this.receivers.Add(channel, channelReceiver);
}
}
if (abortChannel)
{
channel.Abort();
}
}
public void PrepareChannel(TChannel channel)
{
channel.Faulted += this.onInnerChannelFaulted;
channel.Closed += this.onInnerChannelClosed;
}
void OnInnerChannelFaulted(object sender, EventArgs e)
{
((TChannel)sender).Abort();
}
void OnInnerChannelClosed(object sender, EventArgs e)
{
// remove the channel from our tracking dictionary
TChannel channel = (TChannel)sender;
this.Remove(channel);
channel.Faulted -= this.onInnerChannelFaulted;
channel.Closed -= this.onInnerChannelClosed;
}
public bool Remove(TChannel channel)
{
lock (this.receivers)
{
return this.receivers.Remove(channel);
}
}
TChannel[] GetChannels()
{
lock (this.receivers)
{
TChannel[] channels = new TChannel[this.receivers.Keys.Count];
this.receivers.Keys.CopyTo(channels, 0);
this.receivers.Clear();
return channels;
}
}
protected override void OnAbort()
{
TChannel[] channels = GetChannels();
for (int i = 0; i < channels.Length; i++)
{
channels[i].Abort();
}
}
protected override void OnClose(TimeSpan timeout)
{
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
TChannel[] channels = GetChannels();
for (int i = 0; i < channels.Length; i++)
{
bool success = false;
try
{
channels[i].Close(timeoutHelper.RemainingTime());
success = true;
}
catch (CommunicationException e)
{
DiagnosticUtility.TraceHandledException(e, TraceEventType.Information);
}
catch (TimeoutException e)
{
if (TD.CloseTimeoutIsEnabled())
{
TD.CloseTimeout(e.Message);
}
DiagnosticUtility.TraceHandledException(e, TraceEventType.Information);
}
finally
{
if (!success)
{
channels[i].Abort();
}
}
}
}
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
{
TChannel[] channels = GetChannels();
List<ICommunicationObject> collection = new List<ICommunicationObject>();
for (int i = 0; i < channels.Length; i++)
{
collection.Add(channels[i]);
}
return new CloseCollectionAsyncResult(timeout, callback, state, collection);
}
protected override void OnEndClose(IAsyncResult result)
{
CloseCollectionAsyncResult.End(result);
}
protected override TimeSpan DefaultCloseTimeout
{
get { return ServiceDefaults.CloseTimeout; }
}
protected override TimeSpan DefaultOpenTimeout
{
get { return ServiceDefaults.OpenTimeout; }
}
protected override void OnOpen(TimeSpan timeout)
{
}
protected override IAsyncResult OnBeginOpen(TimeSpan timeout, AsyncCallback callback, object state)
{
return new CompletedAsyncResult(callback, state);
}
protected override void OnEndOpen(IAsyncResult result)
{
CompletedAsyncResult.End(result);
}
}
}
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