java-并发集合-并发队列 ConcurrentLinkedQueue 演示

java-并发集合-并发队列 ConcurrentLinkedQueue 演示


目标：模拟 5 个线程同时并发读取“并发队列”，并使用 CountDownLatch 类协助计算消费耗时。

package me.grass.demo.concuronte;import java.util.Date;/** * 同步队列 java.util.concurrent.ConcurrentLinkedQueue 使用 *  */public class ConcurrentLinkedQueueDemo {/** * 生产者快，消费者慢 * @param args * @throws InterruptedException *  @author xxj */public static void main(String[] args) throws InterruptedException {LinkedBlockingQueueDemo._lCountDownLatch.countDown();Date before=new Date();int pTotalThread =100; //最大线程数（生产者）int cTotalThread =5; //活动线程数（消费者）int pActivities=50; //最大线程数（生产者）int cActivities=5; //活动线程数（消费者）_lCountDownLatch = new CountDownLatch(pTotalThread+cTotalThread);startProducer(pActivities,pTotalThread);startConsumer(cActivities,cTotalThread);_lCountDownLatch.await();//等待所有线程完成Date after = new Date();System.out.println("队列为空："+_queue.isEmpty());System.out.println("耗时："+((after.getTime()-before.getTime())/1000));System.out.println("同步队列："+_lCountDownLatch.getCount());}static java.util.concurrent.CountDownLatch _lCountDownLatch;static java.util.concurrent.ConcurrentLinkedQueue<Integer> _queue = new ConcurrentLinkedQueue<Integer>();static void startProducer(int active,int totalThread) throws InterruptedException{java.util.concurrent.ExecutorService pool = Executors.newFixedThreadPool(active);int size =1024*1024*10;//产生 3 M 数据Thread thread ;for(int i=0;i<totalThread;i++){thread = new Thread(new producer(i,size));pool.execute(thread);}}static void startConsumer(int active,int totalThread) throws InterruptedException{java.util.concurrent.ExecutorService pool = Executors.newFixedThreadPool(active);Thread thread ;//启动x个消费者for(int i=0;i<totalThread;i++){thread = new Thread(new consumer());pool.execute(thread);}}/** * 生产者 * @author xxj  * */static class producer implements Runnable{public producer(int key,int size){_size=size;_key=key;}int _key;int _size;public void run() {ConcurrentLinkedQueueDemo._queue.add(_key);//生产System.out.println("已创建："+_key);ConcurrentLinkedQueueDemo._lCountDownLatch.countDown();//线程同步递减}}/** * 消费者 * @author xxj * */static class consumer implements Runnable{public consumer(){}public void run() {//循环消费，直到队列内容为空while(!ConcurrentLinkedQueueDemo._queue.isEmpty()){Integer nInteger = ConcurrentLinkedQueueDemo._queue.poll();//消费System.err.println("消费："+nInteger);try {Thread.sleep(200);//每次消费等一会儿} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}ConcurrentLinkedQueueDemo._lCountDownLatch.countDown();//线程同步递减}}}