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//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.ServiceModel.Dispatcher
{
using System;
using System.Runtime;
using System.ServiceModel;
using System.ServiceModel.Activation;
using System.Threading;
class ThreadBehavior
{
SendOrPostCallback threadAffinityStartCallback;
SendOrPostCallback threadAffinityEndCallback;
static Action<object> cleanThreadCallback;
readonly SynchronizationContext context;
internal ThreadBehavior(DispatchRuntime dispatch)
{
this.context = dispatch.SynchronizationContext;
}
SendOrPostCallback ThreadAffinityStartCallbackDelegate
{
get
{
if (this.threadAffinityStartCallback == null)
{
this.threadAffinityStartCallback = new SendOrPostCallback(this.SynchronizationContextStartCallback);
}
return this.threadAffinityStartCallback;
}
}
SendOrPostCallback ThreadAffinityEndCallbackDelegate
{
get
{
if (this.threadAffinityEndCallback == null)
{
this.threadAffinityEndCallback = new SendOrPostCallback(this.SynchronizationContextEndCallback);
}
return this.threadAffinityEndCallback;
}
}
static Action<object> CleanThreadCallbackDelegate
{
get
{
if (ThreadBehavior.cleanThreadCallback == null)
{
ThreadBehavior.cleanThreadCallback = new Action<object>(ThreadBehavior.CleanThreadCallback);
}
return ThreadBehavior.cleanThreadCallback;
}
}
internal void BindThread(ref MessageRpc rpc)
{
this.BindCore(ref rpc, true);
}
internal void BindEndThread(ref MessageRpc rpc)
{
this.BindCore(ref rpc, false);
}
void BindCore(ref MessageRpc rpc, bool startOperation)
{
SynchronizationContext syncContext = GetSyncContext(rpc.InstanceContext);
if (syncContext != null)
{
IResumeMessageRpc resume = rpc.Pause();
if (startOperation)
{
syncContext.OperationStarted();
syncContext.Post(this.ThreadAffinityStartCallbackDelegate, resume);
}
else
{
syncContext.Post(this.ThreadAffinityEndCallbackDelegate, resume);
}
}
else if (rpc.SwitchedThreads)
{
IResumeMessageRpc resume = rpc.Pause();
ActionItem.Schedule(ThreadBehavior.CleanThreadCallbackDelegate, resume);
}
}
SynchronizationContext GetSyncContext(InstanceContext instanceContext)
{
Fx.Assert(instanceContext != null, "instanceContext is null !");
SynchronizationContext syncContext = instanceContext.SynchronizationContext ?? this.context;
return syncContext;
}
void SynchronizationContextStartCallback(object state)
{
ResumeProcessing((IResumeMessageRpc)state);
}
void SynchronizationContextEndCallback(object state)
{
IResumeMessageRpc resume = (IResumeMessageRpc)state;
ResumeProcessing(resume);
SynchronizationContext syncContext = GetSyncContext(resume.GetMessageInstanceContext());
Fx.Assert(syncContext != null, "syncContext is null !?");
syncContext.OperationCompleted();
}
void ResumeProcessing(IResumeMessageRpc resume)
{
bool alreadyResumedNoLock;
resume.Resume(out alreadyResumedNoLock);
if (alreadyResumedNoLock)
{
string text = SR.GetString(SR.SFxMultipleCallbackFromSynchronizationContext, context.GetType().ToString());
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(text));
}
}
static void CleanThreadCallback(object state)
{
bool alreadyResumedNoLock;
((IResumeMessageRpc)state).Resume(out alreadyResumedNoLock);
if (alreadyResumedNoLock)
{
Fx.Assert("IOThreadScheduler called back twice");
}
}
internal static SynchronizationContext GetCurrentSynchronizationContext()
{
if (AspNetEnvironment.IsApplicationDomainHosted())
{
return null;
}
return SynchronizationContext.Current;
}
}
}
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