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基于队列的线程池

分类: IT文章 • 2022-10-16 00:08:20

http://lavasoft.blog.51cto.com/62575/1542298

基于队列的线程池 基于队列的线程池
2014-08-20 07:22:06
标签：队列 线程池 多线程
版权声明：原创作品，如需转载，请与作者联系。否则将追究法律责任。

基于队列的线程池

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import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
 
public class TestThreadPool {
    //    public static BlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(10);
    public static ArrayBlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(10);
 
    public static void main(String[] args) {
        for (int i = 0; i < 3; i++) {
            queue.add(new TestThread("初始化"));
        }
 
        final ThreadPoolExecutor executor = new ThreadPoolExecutor(2, 3, 15, TimeUnit.SECONDS, queue);
        System.out.println("getActiveCount=" + executor.getActiveCount()
                        + ";getKeepAliveTime=" + executor.getKeepAliveTime(TimeUnit.SECONDS)
                        + ";getCompletedTaskCount=" + executor.getCompletedTaskCount()
                        + ";getCorePoolSize=" + executor.getCorePoolSize()
                        + ";getLargestPoolSize=" + executor.getLargestPoolSize()
                        + ";getMaximumPoolSize=" + executor.getMaximumPoolSize()
                        + ";getPoolSize=" + executor.getPoolSize()
                        + ";getTaskCount=" + executor.getTaskCount()
                        + ";getQueue().size()=" + executor.getQueue().size()
        );
        executor.execute(queue.poll());
        System.out.println("getActiveCount=" + executor.getActiveCount()
                        + ";getKeepAliveTime=" + executor.getKeepAliveTime(TimeUnit.SECONDS)
                        + ";getCompletedTaskCount=" + executor.getCompletedTaskCount()
                        + ";getCorePoolSize=" + executor.getCorePoolSize()
                        + ";getLargestPoolSize=" + executor.getLargestPoolSize()
                        + ";getMaximumPoolSize=" + executor.getMaximumPoolSize()
                        + ";getPoolSize=" + executor.getPoolSize()
                        + ";getTaskCount=" + executor.getTaskCount()
                        + ";getQueue().size()=" + executor.getQueue().size()
        );
 
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.println("getActiveCount=" + executor.getActiveCount()
                                    + ";getKeepAliveTime=" + executor.getKeepAliveTime(TimeUnit.SECONDS)
                                    + ";getCompletedTaskCount=" + executor.getCompletedTaskCount()
                                    + ";getCorePoolSize=" + executor.getCorePoolSize()
                                    + ";getLargestPoolSize=" + executor.getLargestPoolSize()
                                    + ";getMaximumPoolSize=" + executor.getMaximumPoolSize()
                                    + ";getPoolSize=" + executor.getPoolSize()
                                    + ";getTaskCount=" + executor.getTaskCount()
                                    + ";getQueue().size()=" + executor.getQueue().size()
                    );
                    try {
                        Thread.currentThread().sleep(1000L);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
 
        new Thread(new Runnable() {
            @Override
            public void run() {
                int i = 0;
                while (true) {
                    queue.add(new TestThread("生产者"));
                    try {
                        Thread.currentThread().sleep(500L);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    i++;
                    if (i > 10) break;
                }
            }
        }).start();
    }
}
 
class TestThread implements Runnable {
    public static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private String name;        //创建者
    private Date addDate;       //添加到队列的日期
 
    TestThread(String name) {
        this.name = name;
        this.addDate = new Date();
    }
 
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() +
                "：创建者=" + name + "，创建时间=" + sdf.format(addDate) + "，执行时间=" + sdf.format(new Date()) + ",当前队列大小=" + TestThreadPool.queue.size());
        try {
            Thread.currentThread().sleep(1000L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

执行结果：

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getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=0;getCorePoolSize=2;getLargestPoolSize=0;getMaximumPoolSize=3;getPoolSize=0;getTaskCount=3;getQueue().size()=3
getActiveCount=1;getKeepAliveTime=15;getCompletedTaskCount=0;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=3;getQueue().size()=2
pool-1-thread-1：创建者=初始化，创建时间=2014-08-20 12:08:19，执行时间=2014-08-20 12:08:19,当前队列大小=2
getActiveCount=1;getKeepAliveTime=15;getCompletedTaskCount=0;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=3;getQueue().size()=2
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=1;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=6;getQueue().size()=4
pool-1-thread-1：创建者=初始化，创建时间=2014-08-20 12:08:19，执行时间=2014-08-20 12:08:20,当前队列大小=4
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=2;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=8;getQueue().size()=5
pool-1-thread-1：创建者=初始化，创建时间=2014-08-20 12:08:19，执行时间=2014-08-20 12:08:21,当前队列大小=5
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=3;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=10;getQueue().size()=6
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:19，执行时间=2014-08-20 12:08:22,当前队列大小=6
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=4;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=12;getQueue().size()=7
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:19，执行时间=2014-08-20 12:08:23,当前队列大小=7
getActiveCount=1;getKeepAliveTime=15;getCompletedTaskCount=5;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=8
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:20，执行时间=2014-08-20 12:08:24,当前队列大小=8
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=6;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=7
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:20，执行时间=2014-08-20 12:08:25,当前队列大小=7
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=7;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=6
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:21，执行时间=2014-08-20 12:08:26,当前队列大小=6
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=8;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=5
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:21，执行时间=2014-08-20 12:08:27,当前队列大小=5
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=9;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=4
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:22，执行时间=2014-08-20 12:08:28,当前队列大小=4
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=10;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=3
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:22，执行时间=2014-08-20 12:08:29,当前队列大小=3
getActiveCount=1;getKeepAliveTime=15;getCompletedTaskCount=11;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=2
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:23，执行时间=2014-08-20 12:08:30,当前队列大小=2
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=12;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=1
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:23，执行时间=2014-08-20 12:08:31,当前队列大小=1
getActiveCount=1;getKeepAliveTime=15;getCompletedTaskCount=12;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=1
pool-1-thread-1：创建者=生产者，创建时间=2014-08-20 12:08:24，执行时间=2014-08-20 12:08:32,当前队列大小=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
getActiveCount=0;getKeepAliveTime=15;getCompletedTaskCount=14;getCorePoolSize=2;getLargestPoolSize=1;getMaximumPoolSize=3;getPoolSize=1;getTaskCount=14;getQueue().size()=0
 
Process finished with exit code -1

这个是理想情况，如果生产者创建速度大于消费者速度，则会随着时间推移耗尽系统资源，这个需要通过RejectedExecutionHandler来实现。

对这个例子，做了一些改动，可以更加清楚看到执行过程：

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import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
 
public class TestThreadPool {
    //    public static BlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(10);
//    public static ArrayBlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(10);
//    public static ArrayBlockingQueue<Runnable> queue = new ArrayBlockingQueue<Runnable>(10);
    public static LinkedBlockingQueue<Runnable> queue = new LinkedBlockingQueue<Runnable>();
 
    public static void main(String[] args) {
        for (int i = 0; i < 2; i++) {
            queue.add(new TestThread("初始化"));
        }
 
        final ThreadPoolExecutor executor = new ThreadPoolExecutor(1, 3, 15, TimeUnit.SECONDS, queue);
//        System.out.println("getActiveCount=" + executor.getActiveCount()
//                        + ";getKeepAliveTime=" + executor.getKeepAliveTime(TimeUnit.SECONDS)
//                        + ";getCompletedTaskCount=" + executor.getCompletedTaskCount()
//                        + ";getCorePoolSize=" + executor.getCorePoolSize()
//                        + ";getLargestPoolSize=" + executor.getLargestPoolSize()
//                        + ";getMaximumPoolSize=" + executor.getMaximumPoolSize()
//                        + ";getPoolSize=" + executor.getPoolSize()
//                        + ";getTaskCount=" + executor.getTaskCount()
//                        + ";getQueue().size()=" + executor.getQueue().size()
//        );
//        executor.execute(new Thread());
        executor.prestartCoreThread();
//        System.out.println("getActiveCount=" + executor.getActiveCount()
//                        + ";getKeepAliveTime=" + executor.getKeepAliveTime(TimeUnit.SECONDS)
//                        + ";getCompletedTaskCount=" + executor.getCompletedTaskCount()
//                        + ";getCorePoolSize=" + executor.getCorePoolSize()
//                        + ";getLargestPoolSize=" + executor.getLargestPoolSize()
//                        + ";getMaximumPoolSize=" + executor.getMaximumPoolSize()
//                        + ";getPoolSize=" + executor.getPoolSize()
//                        + ";getTaskCount=" + executor.getTaskCount()
//                        + ";getQueue().size()=" + executor.getQueue().size()
//        );
 
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    System.out.println("getActiveCount=" + executor.getActiveCount()
                                    + ";getKeepAliveTime=" + executor.getKeepAliveTime(TimeUnit.SECONDS)
                                    + ";getCompletedTaskCount=" + executor.getCompletedTaskCount()
                                    + ";getCorePoolSize=" + executor.getCorePoolSize()
                                    + ";getLargestPoolSize=" + executor.getLargestPoolSize()
                                    + ";getMaximumPoolSize=" + executor.getMaximumPoolSize()
                                    + ";getPoolSize=" + executor.getPoolSize()
                                    + ";getTaskCount=" + executor.getTaskCount()
                                    + ";getQueue().size()=" + executor.getQueue().size()
                    );
                    try {
                        Thread.currentThread().sleep(200L);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
 
        new Thread(new Runnable() {
            @Override
            public void run() {
                int i = 0;
                while (true) {
                    queue.add(new TestThread("生产者"));
                    try {
                        Thread.currentThread().sleep(100L);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    i++;
                    if (i > 100) break;
                }
            }
        }).start();
    }
}
 
class TestThread implements Runnable {
    public static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    private String name;        //创建者
    private Date addDate;       //添加到队列的日期
 
    TestThread(String name) {
        this.name = name;
        this.addDate = new Date();
    }
 
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() +
                "：创建者=" + name + "，创建时间=" + sdf.format(addDate) + "，执行时间=" + sdf.format(new Date()) + ",当前队列大小=" + TestThreadPool.queue.size());
 
        System.out.println(TestThreadPool.queue.peek());
        try {
            Thread.currentThread().sleep(1000L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

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