Queue like Subject in RxJava

Question

I\'m looking for a Subject (or something similar) that can:

1. Could receive items and hold them in a queue or buffer if there are no subscribers
2. Once we

Answer 1

If you only want to wait for a single subscriber, use UnicastSubject but note that if you unsubscribe in the middle, all subsequent queued items will be lost.

Edit:

Once we have a subscriber all items are consumed and never emitted again

For multiple subscribers, use ReplaySubject.