具有匿名线程的 Reactor Scheduler

Question

我正在测试 reactor 的工作原理，创建的代码与 reactor 文档中的代码非常相似。

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();
  }
}

我做不到运行，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尝试一下。

Answer 1

你的测试程序什么都不打印的原因是它退出得太早了。它应该等到订阅者的方法被调用：

@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();
}

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