BlockingDeque : BlockingDeque « Collections « Java Tutorial

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2. Collections
3. BlockingDeque

A blocking deque is represented by the java.util.concurrent.BlockingDeque interface.

A blocking deque is a deque that waits to become non-empty before retrieving an element and waits for space to become available before storing an element.

A blocking deque is thread-safe and does not permit null elements.

import java.util.concurrent.BlockingDeque;
import java.util.concurrent.LinkedBlockingDeque;

class Producer implements Runnable {
  private String name;

  private BlockingDeque<Integer> deque;

  public Producer(String name, BlockingDeque<Integer> deque) {
    this.name = name;
    this.deque = deque;
  }

  public synchronized void run() {

    for (int i = 0; i < 10; i++) {
      try {
        deque.putFirst(i);
        System.out.println(name + " puts " + i);
        Thread.sleep(300);

      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }

  }
}

class Consumer implements Runnable {
  private String name;

  private BlockingDeque<Integer> deque;

  public Consumer(String name, BlockingDeque<Integer> deque) {
    this.name = name;
    this.deque = deque;
  }

  public synchronized void run() {
    for (int i = 0; i < 10; i++) {
      try {
        int j = deque.takeLast();
        System.out.println(name + " takes " + j);
        Thread.sleep(3000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
}

public class BlockingDequeTester {
  public static void main(String[] args) {
    BlockingDeque<Integer> deque = new LinkedBlockingDeque<Integer>(5);
    Runnable producer = new Producer("Producer", deque);
    Runnable consumer = new Consumer("Consumer", deque);
    new Thread(producer).start();
    try {
      Thread.sleep(500);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }

    new Thread(consumer).start();
  }
}