Learning RxJava

Cold Observables

Cold Observables are much like a music CD that can be replayed to each listener, so each person can hear all the tracks at any time. In the same manner, cold Observables will replay the emissions to each Observer, ensuring that all Observers get all the data. Most data-driven Observables are cold, and this includes the Observable.just() and Observable.fromIterable() factories.

In the following example, we have two Observers subscribed to one Observable. The Observable will first play all the emissions to the first Observer and then call onComplete(). Then, it will play all the emissions again to the second Observer and call onComplete(). They both receive the same datasets by getting two separate streams each, which is typical ...