具有匿名线程的反应器调度程序

Question

我正在测试 reactor 的工作原理，创建了与 reactor 文档中的代码非常相似的代码。import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import reactor.core.publisher.Mono;import reactor.core.scheduler.Scheduler;import reactor.core.scheduler.Schedulers;@SpringBootTest@RunWith(SpringRunner.class)public class ReactorApplicationTests {  @Test  public void publishOnThreadTest() {    Scheduler s = Schedulers.newParallel("parallel-scheduler", 4);    final Mono<String> mono = Mono.just("Publish on test: \n")            .map(msg -> msg + "before: " + Thread.currentThread() )            .publishOn(s)            .map(msg -> msg + "\nafter: " + Thread.currentThread());    new Thread(() -> mono.subscribe(System.out::println)).start();  }}我不能让它运行，我做错了什么？只需订阅它就可以工作，但我想看看使用的线程并玩一下它。

Answer 1

您的测试程序什么也不打印的原因是它退出得太早了。它应该等到调用 substriber 的方法：

@Test

public void publishOnThreadTest() throws InterruptedException {

    Scheduler s = Schedulers.newParallel("parallel-scheduler", 4);

    CountDownLatch latch = new CountDownLatch(1);

    final Mono<String> mono = Mono.just("Publish on test: \n")

            .map(msg -> msg + "before: " + Thread.currentThread() )

            .publishOn(s)

            .map(msg -> msg + "\nafter: " + Thread.currentThread());

    new Thread(() -> mono.subscribe((String str) ->{

        System.out.println(str);

        latch.countDown();

    })).start();

    latch.await();

}