public IDisposable Connect(Action <IDisposable> onConnect = null)
{
for (; ;)
{
var subject = Volatile.Read(ref connection);
if (subject == null)
{
subject = new CacheSubject <T>();
if (Interlocked.CompareExchange(ref connection, subject, null) != null)
{
continue;
}
}
else
{
if (subject.HasException() || subject.HasCompleted() || subject.IsDisposed())
{
Interlocked.CompareExchange(ref connection, null, subject);
continue;
}
}
var shouldConnect = subject.Prepare();
onConnect?.Invoke(subject);
if (shouldConnect)
{
source.Subscribe(subject);
}
return(subject);
}
}
public void Dispose()
{
if (Interlocked.Exchange(ref downstream, null) != null)
{
parent.Remove(this);
parent.manager.Drain(this);
parent = null;
}
}
public void Subscribe(ISignalObserver <T> observer)
{
for (; ;)
{
var subject = Volatile.Read(ref connection);
if (subject == null)
{
subject = new CacheSubject <T>();
if (Interlocked.CompareExchange(ref connection, subject, null) != null)
{
continue;
}
}
subject.Subscribe(observer);
break;
}
}
public CacheDisposable(ISignalObserver <T> downstream, CacheSubject <T> parent)
{
this.downstream = downstream;
Volatile.Write(ref this.parent, parent);
}