如何在Java 9中实现Flow.Publisher接口？

一个Publisher接口是一个提供无限数量的有序元素的提供者，根据从其Subscriber(s)接收到的需求进行发布。响应调用Publisher.subscribe(Subscriber)，Subscriber上的方法的可能调用顺序。这意味着onSubscribe()方法，后跟无限数量的onNext()方法（根据Subscriber的要求），然后是onError()方法（如果有失败）或onComplete()方法（当没有更多元素可用时，只要Subscription未被取消）。

public interface Publisher<T> { public void subscribe(Subscriber<? super T> s); }

示例

import java.util.concurrent.*;
import java.util.*;
import java.util.stream.*;

class SimplePublisher implements Flow.Publisher<Integer> {
   private final Iterator<Integer> iterator;
   SimplePublisher(int count) {
      this.iterator = IntStream.rangeClosed(1, count).iterator();
   }
   @Override
   public void subscribe(Flow.Subscriber<? super Integer> subscriber) {
      iterator.forEachRemaining(subscriber::onNext);
      subscriber.onComplete();
   }
}

public class SimplePublisherImpltest {
   public static void main(String args[]) {
      new SimplePublisher(10).subscribe(new Flow.Subscriber<>() {
         @Override
         public void onSubscribe(Flow.Subscription subscription) {
         }
         @Override
         public void onNext(Integer item) {
            System.out.println("item = [" + item + "]");
         }
         @Override
         public void onError(Throwable throwable) {
         }
         @Override
         public void onComplete() {
            System.out.println("complete");
         }
      });
   }
}

输出

item = [1]
item = [2]
item = [3]
item = [4]
item = [5]
item = [6]
item = [7]
item = [8]
item = [9]
item = [10]
complete

以上就是如何在Java 9中实现Flow.Publisher接口？的详细内容，更多请关注编程之家其它相关文章！