Flow API is the official support for the reactive flows specification since Java 9. It is a combined pattern of Iterator and Observer. Flow API is an interop specification, not an end-user API like RxJava.
Flow API consists of four basic interfaces:
- Subscriber: Subscriber to publisher Subscribe to callbacks.
- Publisher: The publisher publishes a stream of data items to registered subscribers.
- Subscription: The link between publisher and subscriber.
- Processor: The processor sits between the publisher and the subscriber and transforms one stream into another.
In the example below, we create a basic subscriber that requests a data object, prints it and requests another data object. We can use the publisher implementation provided by Java (SubmissionPublisher) to complete our session.
Example
import java.util.concurrent.Flow; import java.util.List; import java.util.concurrent.SubmissionPublisher; class MySubscriber<T>implements <strong>Flow.Subscriber<T></strong> { private <strong>Flow.Subscription</strong> subscription; <strong>@Override</strong> public void <strong>onSubscribe</strong>(Flow.Subscription subscription) { this.subscription = subscription; this.subscription.request(1); } <strong>@Override</strong> public void <strong>onNext</strong>(T item) { System.out.println(item); subscription.request(1); } <strong>@Override</strong> public void <strong>onError</strong>(Throwable throwable) { throwable.printStackTrace(); } <strong>@Override</strong> public void <strong>onComplete</strong>() { System.out.println("Done"); } } <strong>// main class</strong> public class FlowTest { public static void main(String args[]) { <strong>List<String></strong> items = <strong>List.of</strong>("1", "2", "3", "4", "5", "6", "7", "8", "9", "10"); <strong>SubmissionPublisher<String></strong> publisher = new SubmissionPublisher<>(); publisher.<strong>subscribe</strong>(new MySubscriber<>()); items.forEach(s -> { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } publisher.<strong>submit</strong>(s); }); publisher.close(); } }
Output
<strong>1 2 3 4 5 6 7 8 9</strong> <strong>10 Done</strong>
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