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如何将订阅者与reactor.core.publisher.Flux连接?

project-reactor java

deamon · 技术社区 · 9 年前

我想用反应堆通量连接用户。然而,我的小示例没有产生任何输出:

public static void main(String[] args) throws InterruptedException {
    Flux.just("a", "b", "c")
            .subscribe(new BaseSubscriber<String>() {
                @Override
                protected void hookOnSubscribe(Subscription ignored) {
                }

                @Override
                protected void hookOnNext(String value) {
                    System.out.print(value);
                }
            });
    Thread.sleep(1000);
}

org.reactivestreams.Subscriber :

    Flux.just("a", "b", "c")
            .subscribe(new Subscriber<String>() {
                @Override
                public void onSubscribe(Subscription s) {
                }

                @Override
                public void onNext(String s) {
                    System.out.println(s);
                }

                @Override
                public void onError(Throwable t) {
                }

                @Override
                public void onComplete() {
                }
            });

但同样,没有输出。

Flux.just("a", "b", "c").subscribe(System.out::println);

…它产生预期输出:

a
b
c

我如何使用订阅者从流量中接收值?

1 回复 | 直到 9 年前

deamon 9 年前

关键是 request n源中的更多值。在那次通话之前什么都不会发生。

示例 BaseSubscriber

Flux<String> source = Flux.just("a", "b", "c");
source.subscribe(new BaseSubscriber<String>() {
            @Override
            protected void hookOnSubscribe(Subscription subscription) {
                request(1); // <-- here
            }

            @Override
            protected void hookOnNext(String value) {
                request(1); // <-- here
                System.out.println(value);
            }
        });

标准也是如此 Subscriber

Flux<String> source = Flux.just("a", "b", "c");
source.subscribe(new Subscriber<String>() {
    private Subscription subscription;

    @Override
    public void onSubscribe(Subscription subscription) {
        this.subscription = subscription;
        subscription.request(1); // <-- here
    }

    @Override
    public void onNext(String s) {
        subscription.request(1); // <-- here
        System.out.println(s);
    }

    @Override
    public void onError(Throwable t) {
    }

    @Override
    public void onComplete() {
    }
});

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