public IObservable <IDeliveryArgs> GetResponses(DispatchArgs args)
{
if (args == null)
{
throw new ArgumentNullException(nameof(args));
}
if (false == args.HasCorrelationId)
{
throw new ArgumentException($"{nameof(args)}.{nameof(args.CorrelationId)} is missing.");
}
if (0 == Interlocked.CompareExchange(ref _privateResponsesConnected, 1, 0))
{
_privateResponses.Connect();
}
return(Observable
.Create <IDeliveryArgs>(Subscribe)
.SubscribeOn(_privateEventLoopScheduler)
.Do(InspectAndLog)
.Where(IsIntentPermitted)
.ObserveOn(_privateEventLoopScheduler));
IDisposable Subscribe(IObserver <IDeliveryArgs> observer)
{
observer = observer.NotifyOn(TaskPoolScheduler.Default);
var subscription = Disposable.Create(() =>
_privateResponseObserversByCorrelationId.Remove(args.CorrelationId));
try
{
_privateResponseObserversByCorrelationId.TryAdd(args.CorrelationId, observer);
SendAsync(args);
return(subscription);
}
catch
{
subscription.Dispose();
throw;
}
}
bool IsIntentPermitted(IDeliveryArgs reply) =>
_appInfo.IsExpectedReply(AppletId, args.IntentId, reply.IntentId);
void InspectAndLog(IDeliveryArgs reply)
{
if (false == IsIntentPermitted(reply))
{
Trace.TraceError(new StringBuilder("Unexpected Fan-Out response.")
.Append($" Initiating applet: {AppletName}.")
.Append($" Fan-Out request: {_appInfo.GetIntentName(args.IntentId)}.")
.Append($" Fan-Out response: {reply.IntentName}.")
.ToString()
);
}
}
}