Method subscribeActual

src/main/java/io/reactivex/rxjava3/core/Maybe.java:5395–5395

Implement this method in subclasses to handle the incoming MaybeObservers. There is no need to call any of the plugin hooks on the current Maybe instance or the MaybeObserver; all hooks and basic safeguards have been applied by #subscribe(MaybeObserver) before this

(@NonNull MaybeObserver<? super T> observer)

     * @param observer the {@code MaybeObserver} to handle, not {@code null}
     */
    protected abstract void subscribeActual(@NonNull MaybeObserver<? super T> observer);

    /**
     * Asynchronously subscribes subscribers to this {@code Maybe} on the specified {@link Scheduler}.