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法律研究我們如何在 Java 9 中實現 SubmissionPublisher 類？
從 Java 9 開始，我們可以透過引入四個核心介面來建立響應式流：Publisher、Subscriber、Subscription、Processor，以及一個具體類：SubmissionPublisher ，它實現了Publisher 介面。每個介面扮演著不同的角色，對應於響應式 流的原則。我們可以使用SubmissionPublisher 類的submit()方法向每個訂閱者釋出提供的專案。
語法
public class SubmissionPublisher<T> extends Object implements Flow.Publisher<T>, AutoCloseable
在下面的示例中，我們可以實現SubmissionPublisher類
示例
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
import java.util.concurrent.SubmissionPublisher;
class MySubscriber<T> implements Subscriber<T> {
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<String> publisher = new SubmissionPublisher<>();
MySubscriber<String> subscriber = new MySubscriber<>("Mine");
MySubscriber<String> subscriberYours = new MySubscriber<>("Yours");
MySubscriber<String> subscriberHis = new MySubscriber<>("His");
MySubscriber<String> 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();
}
}輸出
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
更新於： 09-Mar-2020
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