public Subscription(BehaviorSubject <T> parent, IObserver <T> unsubscribeTarget)
{
this.parent = parent;
this.unsubscribeTarget = unsubscribeTarget;
}
public IDisposable Subscribe(IObserver <T> observer)
{
if (observer == null)
{
throw new ArgumentNullException("observer");
}
Exception ex = null;
T value = default(T);
BehaviorSubject <T> .Subscription subscription = null;
object obj = this.observerLock;
lock (obj)
{
this.ThrowIfDisposed();
if (!this.isStopped)
{
ListObserver <T> listObserver = this.outObserver as ListObserver <T>;
if (listObserver != null)
{
this.outObserver = listObserver.Add(observer);
}
else
{
IObserver <T> observer2 = this.outObserver;
if (observer2 is EmptyObserver <T> )
{
this.outObserver = observer;
}
else
{
this.outObserver = new ListObserver <T>(new ImmutableList <IObserver <T> >(new IObserver <T>[]
{
observer2,
observer
}));
}
}
value = this.lastValue;
subscription = new BehaviorSubject <T> .Subscription(this, observer);
}
else
{
ex = this.lastError;
}
}
if (subscription != null)
{
observer.OnNext(value);
return(subscription);
}
if (ex != null)
{
observer.OnError(ex);
}
else
{
observer.OnCompleted();
}
return(Disposable.Empty);
}