public async Task <IObservable <RealTimeMeasurement> > SubscribeHome(Guid homeId, CancellationToken cancellationToken)
{
CheckObjectNotDisposed();
int subscriptionId;
bool shouldInitialize;
HomeRealTimeMeasurementObservable observable;
lock (_homeObservables)
{
shouldInitialize = !_homeObservables.Any();
if (_homeObservables.TryGetValue(homeId, out var collection))
{
throw new InvalidOperationException($"Home '{homeId}' is already subscribed. ");
}
subscriptionId = Interlocked.Increment(ref _streamId);
_homeObservables.Add(
homeId,
collection = new HomeStreamObserverCollection {
Observable = new HomeRealTimeMeasurementObservable(this, homeId, subscriptionId)
});
observable = collection.Observable;
}
try
{
if (shouldInitialize)
{
await Initialize(cancellationToken);
StartListening();
_streamRestartTimer.Change(StreamReSubscriptionCheckPeriodMs, 5000);
}
await SubscribeStream(homeId, subscriptionId, cancellationToken);
if (!observable.IsInitialized)
{
throw new InvalidOperationException($"real-time measurement subscription initialization failed{(observable.ErrorMessage == null ? null : $": {observable.ErrorMessage}")}");
}
}
catch
{
lock (_homeObservables)
_homeObservables.Remove(homeId);
throw;
}
return(observable);
}
private void UnsubscribeObserver(HomeStreamObserverCollection collection, IObserver <RealTimeMeasurement> observer)
{
lock (_homeObservables)
collection.Observers.Remove(observer);
}
