Publisher and Subscriber with ExecutorService - Java Thread

Java examples for Thread:ExecutorService

  1. HOME
  2. Java
  3. Thread
  4. ExecutorService

Description

Publisher and Subscriber with ExecutorService

Demo Code



import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class PubSub {
    private List<String> queue = new ArrayList<>();

    public static void main(String[] args) throws InterruptedException {
    PubSub pubSub = new PubSub();
    ExecutorService executor = Executors.newFixedThreadPool(5);
    executor.execute(() -> pubSub.publish());
    executor.execute(() -> pubSub.subscribe());

    executor.shutdown();/*from ww  w .ja  v  a2  s.  co  m*/
}

    private void publish() {
        String message;
        for (int i = 0; i < 10; i++) {
            synchronized (this) {
                while (queue.size() == 3) {
                    // wait
                    try {
                        this.wait();
                    } catch (InterruptedException e) {
                    }
                }
                message = UUID.randomUUID().toString();
                System.out.println(Thread.currentThread().getName()
                        + ": Publish......" + message);
                queue.add(message);
                // notify sub
                this.notify();
            }
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private void subscribe() {
        for (int i = 0; i < 10; i++) {
            synchronized (this) {
                while (queue.size() == 0) {
                    // wait
                    try {
                        this.wait();
                    } catch (InterruptedException e) {
                    }
                }
                System.out.println(Thread.currentThread().getName()
                        + ": Subscribe......" + queue.remove(0));
                // notify pub
                this.notify();
            }
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

Related Tutorials