src/main/java/io/reactivex/internal/operators/observable/ObservableReplay.java
public static <T> ConnectableObservable<T> create(ObservableSource<T> source,
            long maxAge, TimeUnit unit, Scheduler scheduler) {
        return create(source, maxAge, unit, scheduler, Integer.MAX_VALUE);
    }
public static <T> ConnectableObservable<T> create(ObservableSource<T> source,
            long maxAge, TimeUnit unit, Scheduler scheduler) {
        return create(source, maxAge, unit, scheduler, Integer.MAX_VALUE);
    }
Creates a replaying ConnectableObservable with a time bound buffer.
@param <T> the value type
@param source the source ObservableSource to use
@param maxAge the maximum age of entries
@param unit the unit of measure of the age amount
@param scheduler the target scheduler providing the current time
@return the new ConnectableObservable instance