自定义线程池管理类

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class ThreadPoolManager {
    private static ThreadPoolManager mInstance;

    private int corePoolSize;
    /**
     * 最大线程池数量，表示当缓冲队列满的时候能继续容纳的等待任务的数量
     */
    private int maximumPoolSize;
    /**
     * 存活时间
     */
    private long keepAliveTime = 1;
    private TimeUnit unit = TimeUnit.HOURS;
    private ThreadPoolExecutor executor;

    // 缓冲队列
    private static BlockingQueue workQueue = null;


    public static ThreadPoolManager getInstance() {
        if (mInstance == null){
            synchronized (ThreadPoolManager.class){
                if (mInstance == null){
                    mInstance = new ThreadPoolManager();
                    mInstance.init();
                }
            }
        }
        return mInstance;
    }

    private void init(){
        //给corePoolSize赋值：当前设备可用处理器核心数*2 + 1,能够让cpu的效率得到最大程度执行（有研究论证的）
        corePoolSize = Runtime.getRuntime().availableProcessors() * 2 + 1;
        maximumPoolSize = corePoolSize;

        workQueue = new LinkedBlockingQueue(100);

        executor = new ThreadPoolExecutor(
                //当某个核心任务执行完毕，会依次从缓冲队列中取出等待任务
                corePoolSize,
                //5,先corePoolSize,然后new LinkedBlockingQueue(),然后maximumPoolSize,但是它的数量是包含了corePoolSize的
                maximumPoolSize,
                //表示的是maximumPoolSize当中等待任务的存活时间
                keepAliveTime,
                unit,
                //缓冲队列，用于存放等待任务，Linked的先进先出
//                new LinkedBlockingQueue(),
                workQueue,
                //创建线程的工厂
                //  Executors.defaultThreadFactory(),
                new DefaultThreadFactory(Thread.NORM_PRIORITY, "tiaoba-pool-"),
                //用来对超出maximumPoolSize的任务的处理策略
                new ThreadPoolExecutor.AbortPolicy()
        );
    }


    private static class DefaultThreadFactory implements ThreadFactory {
        /**
         * 线程池的计数
         */
        private static final AtomicInteger poolNumber = new AtomicInteger(1);

        /**
         * 线程的计数
         */
        private final AtomicInteger threadNumber = new AtomicInteger(1);

        private final ThreadGroup group;
        private final String namePrefix;
        private final int threadPriority;

        DefaultThreadFactory(int threadPriority, String threadNamePrefix) {
            this.threadPriority = threadPriority;
            //默认线程组
            this.group = Thread.currentThread().getThreadGroup();
            namePrefix = threadNamePrefix + poolNumber.getAndIncrement() + "-thread-";
        }

        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
            //isDaemon() 测试该线程是否为守护线程
            if (t.isDaemon()) {
                t.setDaemon(false);
            }
            t.setPriority(threadPriority);
            return t;
        }
    }


    public void execute(Runnable runnable) {
        if (executor == null){
            init();
        }
        if (runnable != null){
            executor.execute(runnable);
        }
    }
}