private static Uri GetObserverUri <T>(IReliableQbserver <T> observer)
{
if (!TryGetUriFromKnownResource(observer, out var uri))
{
throw new InvalidOperationException("Cannot notify an observer without a known URI-based identity. Did you get the observer through GetObserver? Did you use DefineObserver to define the observer prior to usage?");
}
return(uri);
}
protected override IReliableReactiveObserver <T> GetObserverCore <T>(IReliableQbserver <T> observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
var observerUri = GetObserverUri(observer);
return(_provider.GetObserver <T>(observerUri));
}
protected override IReliableQubscription SubscribeCore(IReliableQbserver <TOutput> observer, Uri subscriptionUri, object state) => ((ReliableQueryProviderBase)Provider).Subscribe(this, observer, subscriptionUri, state);
protected abstract IReliableReactiveObserver <T> GetObserverCore <T>(IReliableQbserver <T> observer);
internal IReliableReactiveObserver <T> GetObserver <T>(IReliableQbserver <T> observer) => GetObserverCore(observer);
internal IReliableQubscription Subscribe <T>(IReliableQbservable <T> observable, IReliableQbserver <T> observer, Uri subscriptionUri, object state)
{
var subscribe = Expression.Parameter(typeof(Func <IReliableQbservable <T>, IReliableQbserver <T>, IReliableQubscription>), Constants.SubscribeUri);
var expression = Expression.Invoke(subscribe, observable.Expression, observer.Expression);
var normalized = _expressionServices.Normalize(expression);
var subscription = new KnownReliableQubscription(normalized, subscriptionUri, this);
CreateSubscription(subscription, state);
return(subscription);
}