为什么80%的码农都做不了架构师?>>>
定义共享数据封装
package com.xqi.p_c;/*** 请求数据封装(以不变模式定义)* * @author mike
* 2015年7月24日*/
public final class PCData {private final int intData;public PCData(int d) {intData = d;}public PCData(String d) {intData = Integer.valueOf(d);}public int getData(){return this.intData;}@Overridepublic String toString() {return "data:" + intData;}}
2. 定义生产者
package com.xqi.p_c;import java.util.Random;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;/*** 定义生产者* * @author mike
* 2015年7月24日*/
public class Produer implements Runnable {/* 用volatile来修饰的变量,表示随时都可能被其他的线程来改变,并使其他的线程直接访问此变量,而不保存其他的备份! */private volatile boolean isRunning = true;/* 定义内存缓冲区,来存放生产者提交的请求与数据, PCData就是数据的封装 */private BlockingQueue queue;/* 总数,原子操作 ,AtomicInteger提供线程安全的加减操作接口 */private static AtomicInteger count = new AtomicInteger();/* 休眠时间 */private static final int SLEEPTIME = 1000;/*** 构造方法,注入缓冲队列* * @param queue*/public Produer(BlockingQueue queue) {this.queue = queue;}public void run() {PCData data = null;Random r = new Random();System.out.println("start produer id = " + Thread.currentThread().getId());try {while (isRunning) {Thread.sleep(r.nextInt(SLEEPTIME)); // 使用随机产生时间差(消费者中一样)data = new PCData(count.incrementAndGet());// incrementAndGet表示+1System.out.println(data + " is put into queue!");if (!queue.offer(data, 2, TimeUnit.SECONDS)) {// 设定等待的时间为2秒,如果在指定的时间内,还不能往队列中加入,则返回失败。System.err.println("failed to put data : " + data);}}} catch (InterruptedException e) {// 如果发生了异常就中断这个线程e.printStackTrace();Thread.currentThread().interrupt();}}//public void stop() {isRunning = false;}
}
3. 定义消费者
package com.xqi.p_c;import java.text.MessageFormat;
import java.util.Random;
import java.util.concurrent.BlockingQueue;/*** 消费者* * @author mike
* 2015年7月24日*/
public class Consumer implements Runnable {private BlockingQueue queue;private static final int SLEEPTIME = 1000;public Consumer(BlockingQueue queue) {this.queue = queue;}public void run() {System.out.println("start consumer id = " + Thread.currentThread().getId());Random r = new Random();try {while (true) {PCData data = queue.take();// 取走BlockingQueue里排在首位的对象,若BlockingQueue为空,阻断进入等待状态直到Blocking有新的对象被加入为止if (null != data) {int re = data.getData() * data.getData();System.out.println(MessageFormat.format("{0}*{1}={2}", data.getData(), data.getData(), re));Thread.sleep(r.nextInt(SLEEPTIME));}}} catch (InterruptedException e) {e.printStackTrace();Thread.currentThread().interrupt();}}}
4. 测试主类
package com.xqi.p_c;import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;/*** 测试主类* * @author mike
* 2015年7月24日*/
public class PCTest {public static void main(String[] args) throws InterruptedException {BlockingQueue queue = new LinkedBlockingQueue(10);// 创建生产者Produer p1 = new Produer(queue);Produer p2 = new Produer(queue);Produer p3 = new Produer(queue);// 创建消费者Consumer c1 = new Consumer(queue);Consumer c2 = new Consumer(queue);Consumer c3 = new Consumer(queue);// 创建线程池,newCachedThreadPool 定义了短期可重用的线程池ExecutorService service = Executors.newCachedThreadPool();// 运行生产者和消费者service.execute(p1);service.execute(p2);service.execute(p3);service.execute(c1);service.execute(c2);service.execute(c3);Thread.sleep(10 * 1000);// 终止线程中的whilep1.stop();p2.stop();p3.stop();Thread.sleep(3000);// shutdown() This method does not wait for previously submitted tasks to complete execution.// shutdown() 这个方法不会等待任务执行完成。(有说:不再接受新的任务,如果有等待的任务,就执行完成)service.shutdown();// Attempts to stop all actively executing tasks, halts the// processing of waiting tasks, and returns a list of the tasks// that were awaiting execution. These tasks are drained (removed)// from the task queue upon return from this method.// 立即变为shutdown状态,如果有正在执行的任务,尝试停止,并返回未完成的任务列表,然后移除// List taskList = service.shutdownNow();System.out.println("程序结束!");}}
Ps:感觉shutdown了以后,线程还是没有终止,也进行不了操作??????不知道为什么!