Java 11 - 响应式流和反应式编程

1、订阅者

package com.lfsun.java11study.juc;

import java.util.concurrent.Flow;

/**
 * 代表了一个订阅者，用于接收发布者发出的数据项
 * @param <T>
 */
class SimpleSubscriber<T> implements Flow.Subscriber<T> {
    
    
    private Flow.Subscription subscription;

    @Override
    public void onSubscribe(Flow.Subscription subscription) {
    
    
        this.subscription = subscription;
        subscription.request(1); // 请求一个数据项
    }

    @Override
    public void onNext(T item) {
    
    
        System.out.println("Received: " + item);
        subscription.request(1); // 继续请求下一个数据项
    }

    @Override
    public void onError(Throwable throwable) {
    
    
        throwable.printStackTrace();
    }

    @Override
    public void onComplete() {
    
    
        System.out.println("Completed");
    }
}

2、发布者

package com.lfsun.java11study.juc;

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

/**
 * 用于发布数据项
 */
public class ReactiveStreamsDemo {
    
    
    public static void main(String[] args) {
    
    
        // 创建一个 SubmissionPublisher 对象
        SubmissionPublisher<String> publisher = new SubmissionPublisher<>();

        // 创建一个订阅者
        Flow.Subscriber<String> subscriber = new SimpleSubscriber<>();

        // 订阅订阅者
        publisher.subscribe(subscriber);

        // 发布数据项
        publisher.submit("Hello");
        publisher.submit("Reactive");
        publisher.submit("Streams");

        // 添加一个延迟以保持程序运行并处理数据项
        try {
    
    
            Thread.sleep(1000);
        } catch (InterruptedException e) {
    
    
            e.printStackTrace();
        }

        // 完成发布
        publisher.close();
    }
}