Understanding multicasting
We have used the ConnectableObservable earlier in Chapter 2, Observables and Subscribers. Remember how cold Observables, such as Observable.range(), will regenerate emissions for each Observer? Let's take a look at the following code:
import io.reactivex.Observable;
public class Launcher {
public static void main(String[] args) {
Observable<Integer> threeIntegers = Observable.range(1, 3);
threeIntegers.subscribe(i -> System.out.println("Observer One: " + i));
threeIntegers.subscribe(i -> System.out.println("Observer Two: " + i));
}
}The output is as follows:
Observer One: 1 Observer One: 2 Observer One: 3 Observer Two: 1 Observer Two: 2 Observer Two: 3
Here, Observer One received all three emissions and called onComplete(). After that, Observer Two received the three emissions (which were regenerated again) and called onComplete(). These were two separate streams of data generated for two separate subscriptions. If we...