Question

我有以下代码来演示问题：

@Component
public class App {
    @Autowired S1 s1;
    @Autowired S2 s2;
    int jobs = 0;
    @Scheduled(cron = "0 * * * * ?")
    void foo() {
        System.out.println("schedule cron job: " + jobs++);
        Observable<String> observable = Observable.just("bar");
        ConnectableObservable<String> publishedObservable = observable.publish();
        publishedObservable.subscribe(s1);
        publishedObservable.subscribe(s2);
        publishedObservable.connect();
    }
}

Subscriber1的：

@Component
public class S1 extends Subscriber<String> {
    private AtomicInteger counter = new AtomicInteger(0);

    @Override
    public void onCompleted() {
    }

    @Override
    public void onError(Throwable e) {
    }

    @Override
    public void onNext(String s) {
        System.out.println("S1:::: Times called: " + counter.getAndIncrement() + ", input: " + s);

    }
}

subscriber2用户：

@Component
public class S2 extends Subscriber<String> {
    private AtomicInteger counter = new AtomicInteger(0);

    @Override
    public void onCompleted() {
    }

    @Override
    public void onError(Throwable e) {
    }

    @Override
    public void onNext(String s) {
        System.out.println("S2:::: Times called: " + counter.getAndIncrement() + ", input: " + s);
    }
}

输出将是：

schedule cron job: 0
S1:::: Times called: 0, input: bar
S2:::: Times called: 0, input: bar
schedule cron job: 1
schedule cron job: 2
schedule cron job: 3
schedule cron job: 4
......

为什么每次调用foo方法时都不调用S1和S2？如何实现？

这是因为rx有些订阅逻辑还是因为这些bean是单例？

Answer 1

为什么每次调用foo方法时都不调用S1和S2？

RxJava Subscriber是有状态的，一旦他们消耗了一个序列，他们就不再可用，并将自己报告为取消订阅。再次订阅他们没有任何效果。每次需要订阅源代码时都必须重新创建它们。

Spring + RxJava + Schedule cron job：为什么bean只能在可连接的observable上调用一次

1 个答案: