线程池的使用

public class ThreadPoolExecutorUtils {

    private static final int CORE_POOL_SIZE = 10;
    private static final int MAX_POOL_SIZE = 20;
    private static final long KEEP_ALIVE_TIME = 30;
    private static final int QUEUE_SIZE = 20;
    private static final String THREAD_POOL_NAME = "thread-pool";
    private static volatile ExecutorService pool = null;

    private ThreadPoolExecutorUtils(){

    }
    public static ExecutorService getPool() {
        // 使用双重校验锁保证只有一个pool实例
        if (pool == null) {
            synchronized (ThreadPoolExecutorUtils.class) {
                if (pool == null) {
                    ThreadFactory namedThreadFactory = new ThreadFactoryBuilder().setNameFormat(THREAD_POOL_NAME + "-%d").build();
                    pool = new ThreadPoolExecutor(CORE_POOL_SIZE, MAX_POOL_SIZE, KEEP_ALIVE_TIME, TimeUnit.SECONDS,
                            new LinkedBlockingQueue<>(QUEUE_SIZE), namedThreadFactory,
                            new ThreadPoolExecutor.AbortPolicy());
                }
            }
        }
        return pool;
    }
}