public static void main(String[] args) throws InterruptedException {
        AtomicInteger a = new AtomicInteger();
        Observable<Object> objectObservable = Observable.create(subscriber -> {

            new Thread(() -> {
                while(true) {
                    int i = a.incrementAndGet();
                    try {
                        Thread.sleep(4 * 1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    subscriber.onNext("result" + i);
                }
            }).start();

        });

        Subscription subscribe1 = objectObservable.subscribe(r -> {
            System.out.println(r);
        }, e -> {

        });
        Thread.sleep(1000);
        Subscription subscribe2 = objectObservable.subscribe(r -> {
            System.out.println(r);
        }, e -> {

        });
    }