18. Java JUC源码分析系列笔记-Executors

1. 使用

public class TestExecutors
{
    public static void main(String[] args)
    {
        Executors.newCachedThreadPool();
        Executors.newScheduledThreadPool(10, Executors.defaultThreadFactory());
        Executors.newFixedThreadPool(10);
        Executors.newSingleThreadExecutor();

    }
}

2. newCachedThreadPool

    public static ExecutorService newCachedThreadPool() {
        return new ThreadPoolExecutor(0, Integer.MAX_VALUE,//最大线程数有问题
                                      60L, TimeUnit.SECONDS,
                                      new SynchronousQueue<Runnable>());
    }

3. newScheduledThreadPool

public static ScheduledExecutorService newScheduledThreadPool(
    int corePoolSize, ThreadFactory threadFactory) {
return new ScheduledThreadPoolExecutor(corePoolSize, threadFactory);
}

public ScheduledThreadPoolExecutor(int corePoolSize,
                                   ThreadFactory threadFactory) {
   //最大线程数有问题
    super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,
          new DelayedWorkQueue(), threadFactory);
}

4. newFixedThreadPool

    public static ExecutorService newFixedThreadPool(int nThreads) {
        return new ThreadPoolExecutor(nThreads, nThreads,
                                      0L, TimeUnit.MILLISECONDS,
                                      new LinkedBlockingQueue<Runnable>());//使用的LinkedBlockingQueue无界
    }

5. newSingleThreadExecutor

public static ExecutorService newSingleThreadExecutor() {
    return new FinalizableDelegatedExecutorService
        (new ThreadPoolExecutor(1, 1,
                                0L, TimeUnit.MILLISECONDS,
                                new LinkedBlockingQueue<Runnable>()));//使用的LinkedBlockingQueue无界
}