java - Java ThreadFactory 的问题

Question

在我的应用程序中，我使用带有自定义 ThreadFactory 的线程池。

我的代码如下:

pool = Executors.newScheduledThreadPool(10, new TF());

class TF implements ThreadFactory {
    AtomicInteger count = new AtomicInteger(1);
    public synchronized Thread newThread(Runnable r) {
        Thread t = new Thread(r) ;
        t.setName("ThreadPool Thread[" + count.getAndIncrement() + "]");
        t.setUncaughtExceptionHandler(new UEHLogger());
        return t;
    }
}

但是，在将各种 Runnable 提交到线程池之后，如果我转储当前线程(来自 IDE，Intellij IDEA)，我得到:

"ThreadPool Thread[1]" daemon prio=6 tid=0x0334e000 nid=0x1130 waiting on condition [0x0377f000..0x0377fc94]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x22fa7838> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1925)
    at java.util.concurrent.DelayQueue.take(DelayQueue.java:160)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
    at java.lang.Thread.run(Thread.java:619)

"ThreadPool Thread[1]" daemon prio=6 tid=0x0333e400 nid=0x128 waiting on condition [0x0372f000..0x0372fd14]
   java.lang.Thread.State: TIMED_WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x22edb9e0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
    at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:583)
    at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:576)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
    at java.lang.Thread.run(Thread.java:619)

(以及线程 2-9 的类似堆栈跟踪)

所以基本上不是获取线程编号 1,2,3,4,5,6,7,8,9,10，而是获取线程编号 1,1,2,3,4,5,6,7,8 ,9

一切似乎都正常，但显然令人不安。

Answer 1

您不会无意中创建了两个线程池(或两个 ThreadFactories)，对吗？

通过让每个线程输出其线程工厂的 ID 及其自己的 ID 来确认这一点可能是一个想法。