在Java 9中，我们如何实现SubmissionPublisher类？

从 Java 9 开始，我们可以通过引入四个核心接口来创建Reactive Streams：Publisher、Subscriber、Subscription、Processor 和一个具体类：实现 Publisher 的 SubmissionPublisher界面。每个界面都扮演着不同的角色，对应于响应式流的原则。我们可以使用 SubmissionPublisher 类的 submit() 方法将提供的项目发布给每个订阅者。

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public class SubmissionPublisher extends Object implements Flow.Publisher, AutoCloseable

在下面的示例中，我们可以实现 SubmissionPublisher 类

示例

import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
import java.util.concurrent.SubmissionPublisher;

class MySubscriber implements Subscriber {
   private Subscription subscription;
   private String name;
   public MySubscriber(String name) {
      this.name = name;
   }
   @Override
   public void onComplete() {
      System.out.println(name + ": onComplete");
   }
   @Override
   public void onError(Throwable t) {
      System.out.println(name + ": onError");
      t.printStackTrace();
   }
   @Override
   public void onNext(T msg) {
      System.out.println(name + ": " + msg.toString() + " received in onNext");
      subscription.request(1);
   }
   @Override
   public void onSubscribe(Subscription subscription) {
      System.out.println(name + ": onSubscribe");
      this.subscription = subscription;
      subscription.request(1);
   }
}

// Main class
public class FlowTest {
   public static void main(String args[]) {
      SubmissionPublisher publisher = new SubmissionPublisher<>();
      MySubscriber subscriber = new MySubscriber<>("Mine");
      MySubscriber subscriberYours = new MySubscriber<>("Yours");
      MySubscriber subscriberHis = new MySubscriber<>("His");
      MySubscriber subscriberHers = new MySubscriber<>("Her");

      publisher.subscribe(subscriber);
      publisher.subscribe(subscriberYours);
      publisher.subscribe(subscriberHis);
      publisher.subscribe(subscriberHers);

      publisher.submit("One");
      publisher.submit("Two");
      publisher.submit("Three");
      publisher.submit("Four");
      publisher.submit("Five");

      try {
         Thread.sleep(1000);
      } catch(InterruptedException e) {
         e.printStackTrace();
      }
      publisher.close();
   }
}

输出

Yours: onSubscribe
His: onSubscribe
Mine: onSubscribe
His: One received in onNext
Yours: One received in onNext
Mine: One received in onNext
Yours: Two received in onNext
His: Two received in onNext
Yours: Three received in onNext
Mine: Two received in onNext
Yours: Four received in onNext
His: Three received in onNext
Yours: Five received in onNext
Mine: Three received in onNext
Her: onSubscribe
His: Four received in onNext
Her: One received in onNext
Mine: Four received in onNext
Her: Two received in onNext
His: Five received in onNext
Her: Three received in onNext
Mine: Five received in onNext
Her: Four received in onNext
Her: Five received in onNext
Yours: onComplete
His: onComplete
Mine: onComplete
Her: onComplete