有没有更好的方法在android中用rxjava实现单一的真理源？

public class RxBus {
    private static final PublishSubject<Object> bus = PublishSubject.create();

    public static void post(Object event) {
        bus.onNext(event);
    }

    public static Observable<Object> toObservable() {
        return bus;
    }
}

RxBus.toObservable()
    .subscribe(new Consumer<Object>() {
        @Override
        public void accept(Object event) throws Exception {
            // 处理接收到的事件
        }
    });

RxBus.post(new Event());