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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.ServiceModel.Routing
{
using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime;
using System.ServiceModel;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Channels;
using System.Collections.Generic;
using System.Threading;
abstract class RoutingChannelExtension : IExtension<IContextChannel>
{
static AsyncCallback closeChannelsCallback = Fx.ThunkCallback(CloseChannelsCallback);
static AsyncCallback shutdownCallback = Fx.ThunkCallback(ShutdownCallback);
IContextChannel channel;
bool hasSession;
RoutingBehavior.RoutingEndpointBehavior endpointBehavior;
RoutingService sessionService;
volatile SessionChannels sessionChannels;
[Fx.Tag.SynchronizationObject]
object thisLock;
public RoutingChannelExtension(RoutingBehavior.RoutingEndpointBehavior endpointBehavior)
{
this.ActivityID = Guid.NewGuid();
this.endpointBehavior = endpointBehavior;
this.thisLock = new object();
}
internal Guid ActivityID
{
get;
private set;
}
public string EndpointName
{
get { return this.endpointBehavior.EndpointName; }
}
public bool HasSession
{
get { return this.hasSession; }
}
public bool ImpersonationRequired
{
get { return this.endpointBehavior.ImpersonationRequired; }
}
public TimeSpan OperationTimeout
{
get;
private set;
}
public bool ReceiveContextEnabled
{
get { return this.endpointBehavior.ReceiveContextEnabled; }
}
[SuppressMessage(FxCop.Category.Performance, FxCop.Rule.AvoidUncalledPrivateCode, Justification = "get_SessionChannels is called by RoutingService..ctor")]
public SessionChannels SessionChannels
{
get
{
if (this.sessionChannels == null)
{
lock (this.thisLock)
{
if (this.sessionChannels == null)
{
Fx.AssertAndThrow(!(this.ImpersonationRequired && !this.HasSession), "Shouldn't allocate SessionChannels if session-less and impersonating");
this.sessionChannels = new SessionChannels(this.ActivityID);
}
}
}
return this.sessionChannels;
}
}
public bool TransactedReceiveEnabled
{
get { return this.endpointBehavior.TransactedReceiveEnabled; }
}
[SuppressMessage(FxCop.Category.Performance, FxCop.Rule.AvoidUncalledPrivateCode, Justification = "AttachService is called by RoutingService..ctor")]
public void AttachService(RoutingService service)
{
SessionChannels channelsToClose = null;
lock (this.thisLock)
{
if (!this.hasSession)
{
RoutingConfiguration oldConfig = null;
if (this.sessionService != null)
{
oldConfig = this.sessionService.RoutingConfig;
}
if (oldConfig != null && !object.ReferenceEquals(service.RoutingConfig, oldConfig))
{
//The RoutingConfiguration has changed. We need to release any old channels that are cached.
channelsToClose = this.sessionChannels;
this.sessionChannels = null;
}
}
else
{
Fx.Assert(this.sessionService == null, "There must only be one RoutingService created for a sessionful channel");
}
this.sessionService = service;
}
if (channelsToClose != null)
{
channelsToClose.BeginClose(this.channel.OperationTimeout, closeChannelsCallback, channelsToClose);
}
}
public abstract IAsyncResult BeginShutdown(RoutingService service, TimeSpan timeout, AsyncCallback callback, object state);
static void CloseChannelsCallback(IAsyncResult asyncResult)
{
SessionChannels channelsToClose = (SessionChannels)asyncResult.AsyncState;
Exception exception = null;
try
{
channelsToClose.EndClose(asyncResult);
}
catch (CommunicationException communicationException)
{
exception = communicationException;
}
catch (TimeoutException timeoutException)
{
exception = timeoutException;
}
if (exception != null && TD.RoutingServiceHandledExceptionIsEnabled())
{
TD.RoutingServiceHandledException(null, exception);
}
}
static void ShutdownCallback(IAsyncResult result)
{
if (result.CompletedSynchronously)
{
return;
}
RoutingChannelExtension thisPtr = (RoutingChannelExtension)result.AsyncState;
try
{
thisPtr.ShutdownComplete(result);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
thisPtr.Fault(exception);
}
}
void ShutdownComplete(IAsyncResult result)
{
this.EndShutdown(result);
this.channel.Close();
}
public static RoutingChannelExtension Create(RoutingBehavior.RoutingEndpointBehavior endpointBehavior)
{
Type contractType = endpointBehavior.Endpoint.Contract.ContractType;
if (contractType == typeof(IDuplexSessionRouter))
{
return new RoutingChannelExtension<IDuplexSessionRouter>(endpointBehavior);
}
else if (contractType == typeof(ISimplexDatagramRouter))
{
return new RoutingChannelExtension<ISimplexDatagramRouter>(endpointBehavior);
}
else if (contractType == typeof(IRequestReplyRouter))
{
return new RoutingChannelExtension<IRequestReplyRouter>(endpointBehavior);
}
else
{
Fx.Assert(contractType == typeof(ISimplexSessionRouter), "Was a new contract added?");
return new RoutingChannelExtension<ISimplexSessionRouter>(endpointBehavior);
}
}
public void DoneReceiving(TimeSpan closeTimeout)
{
FxTrace.Trace.SetAndTraceTransfer(this.ActivityID, true);
try
{
if (this.sessionService != null)
{
IAsyncResult result = this.BeginShutdown(this.sessionService, closeTimeout, shutdownCallback, this);
if (result.CompletedSynchronously)
{
this.ShutdownComplete(result);
}
}
else
{
this.channel.Close();
}
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
this.Fault(exception);
}
}
public abstract void EndShutdown(IAsyncResult result);
public void Fault(Exception exception)
{
FxTrace.Trace.SetAndTraceTransfer(this.ActivityID, true);
//Notify the error handlers that a problem occurred
foreach (IErrorHandler errorHandler in this.endpointBehavior.ChannelDispatcher.ErrorHandlers)
{
if (errorHandler.HandleError(exception))
{
break;
}
}
SessionChannels channelsToAbort;
lock (this.thisLock)
{
channelsToAbort = this.sessionChannels;
this.sessionChannels = null;
}
if (channelsToAbort != null)
{
channelsToAbort.AbortAll();
}
RoutingUtilities.Abort(this.channel, this.channel.LocalAddress);
}
void IExtension<IContextChannel>.Attach(IContextChannel owner)
{
this.channel = owner;
this.hasSession = (owner.InputSession != null);
this.OperationTimeout = owner.OperationTimeout;
}
void IExtension<IContextChannel>.Detach(IContextChannel owner)
{
}
}
sealed class RoutingChannelExtension<T> : RoutingChannelExtension
{
public RoutingChannelExtension(RoutingBehavior.RoutingEndpointBehavior endpointBehavior)
: base(endpointBehavior)
{
}
public override IAsyncResult BeginShutdown(RoutingService service, TimeSpan timeout, AsyncCallback callback, object state)
{
return new ProcessMessagesAsyncResult<T>(null, service, timeout, callback, state);
}
public override void EndShutdown(IAsyncResult result)
{
ProcessMessagesAsyncResult<T>.End(result);
}
}
}
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