/// <summary>
/// Post or send a delegate to the thread that
/// is defined as using the synContext that is passed into the Task ctor
/// in order for that the delegate event can be raised on the correct thread
/// </summary>
/// <param name="isPost">is the call a non-blocking post(true) or a blocking send(false)</param>
/// <param name="handler">event handler that will be called on the thread defined by synContext</param>
/// <param name="args">arguments for delegate call</param>
protected void PostOrSend(Boolean isPost, Delegate handler, object[] args)
{
//return if null
if (this.syncContext == null)
{
return;
}
//create eventArgs that hold information about the call
ProcessAsyncEventArgs paea = new ProcessAsyncEventArgs(this, handler, args);
if (isPost == false)
{
//throw here if trying to send to same thread
if (this.syncContext == SynchronizationContext.Current)
{
throw new InvalidOperationException("Cannot use send to same thread, use post or SyncNotify event");
}
this.syncContext.Send(this.asyncHandler, paea);
}
else
{
this.syncContext.Post(this.asyncHandler, paea);
}
}
/// <summary>
/// raise an event defined by a ProcessAsyncEventArgs.
/// The event is raised on the thread that is making the RaiseEvent() call
/// </summary>
/// <param name="paea">args that contain all the infomation about event to be raised</param>
private static void RaiseEvent(ProcessAsyncEventArgs paea)
{
//try to cast to known types of handler since those are faster than a DynamicInvoke
//in most cases the handler is either a TaskStatusEventHandler or a SendOrPostCallback
//but throw in a few extras that we know about
if (paea.Handler is FluidTrade.Reporting.TaskStatusEventHandler)
{
((TaskStatusEventHandler)paea.Handler)(paea.Sender, (TaskStatusEventArgs)paea.Args[1]);
}
else if (paea.Handler is System.Threading.SendOrPostCallback)
{
((System.Threading.SendOrPostCallback)paea.Handler)(paea.Args[0]);
}
else if (paea.Handler is EventHandler)
{
//event handler is
if ((paea.Args == null) || (paea.Args.Length < 1))
{
((EventHandler)paea.Handler)(paea.Sender, EventArgs.Empty);
}
else
{
((EventHandler)paea.Handler)(paea.Sender, (EventArgs)paea.Args[0]);
}
}
else if (paea.Handler is MethodInvoker)
{
((MethodInvoker)paea.Handler)();
}
else if (paea.Handler is WaitCallback)
{
((WaitCallback)paea.Handler)(paea.Args[0]);
}
else
{
paea.RetVal = paea.Handler.DynamicInvoke(paea.Args);
}
}