class MaybeCallbackObserver extends AtomicReference<Disposable> implements MaybeObserver<T>, Disposable, LambdaConsumerIntrospection {

    @Override
    public boolean hasCustomOnError() {
        return onError != Functions.ON_ERROR_MISSING;
    }

    public  MaybeCallbackObserver(Consumer<? super T> onSuccess, Consumer<? super Throwable> onError,
            Action onComplete);

}