关于ScheduledThreadPoolExecutor不执行的原因分析

public class ScheduledTask {
    private static final AtomicInteger count = new AtomicInteger(0);
    private static final ScheduledThreadPoolExecutor SCHEDULED_TASK = new ScheduledThreadPoolExecutor(
            1, new ThreadFactory() {
        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(Thread.currentThread().getThreadGroup(), r, "sc-task");
            t.setDaemon(true);
            return t;
        }
    });
    public static void main(String[] args) throws InterruptedException {
        CountDownLatch latch = new CountDownLatch(1);
        SCHEDULED_TASK.scheduleWithFixedDelay(() -> {
            System.out.println(111);
            if (count.get() == 5) {
                throw new IllegalArgumentException("my exception");
            }
            count.incrementAndGet();
        }, 0, 5, TimeUnit.SECONDS);
        latch.await();
    }
}

        public void run() {
            boolean periodic = isPeriodic();
            if (!canRunInCurrentRunState(periodic))
                cancel(false);
            else if (!periodic)
                ScheduledFutureTask.super.run();
            else if (ScheduledFutureTask.super.runAndReset()) {
                setNextRunTime();
                reExecutePeriodic(outerTask);
            }
        }

    protected boolean runAndReset() {
        if (state != NEW ||
            !UNSAFE.compareAndSwapObject(this, runnerOffset,
                                         null, Thread.currentThread()))
            return false;
        boolean ran = false;
        int s = state;
        try {
            Callable<V> c = callable;
            if (c != null && s == NEW) {
                try {
                    c.call(); // don't set result
                    ran = true;
                } catch (Throwable ex) {
                    setException(ex);
                }
            }
        } finally {
            // runner must be non-null until state is settled to
            // prevent concurrent calls to run()
            runner = null;
            // state must be re-read after nulling runner to prevent
            // leaked interrupts
            s = state;
            if (s >= INTERRUPTING)
                handlePossibleCancellationInterrupt(s);
        }
        return ran && s == NEW;
    }

ScheduledThreadPoolExecutor poolExecutor = new ScheduledThreadPoolExecutor(2);  
poolExecutor.schedule(() -> {  
    // 提交的任务
}, 5, TimeUnit.HOURS);  
poolExecutor.scheduleAtFixedRate(() -> {  
    // 提交的任务
}, 0, 5, TimeUnit.HOURS);  
poolExecutor.scheduleWithFixedDelay(() -> {  
    // 提交的任务
}, 0, 5, TimeUnit.HOURS);

ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(10);  
executor.scheduleWithFixedDelay(() -> {  
    System.out.println("测试");  
}, 0, 500, TimeUnit.MILLISECONDS);  
try {  
    executor.awaitTermination(5, TimeUnit.SECONDS);  
    executor.shutdown();  
} catch (InterruptedException e) {  
    e.printStackTrace();  
}

public ScheduledThreadPoolExecutor(int corePoolSize) {  
    super(corePoolSize, Integer.MAX_VALUE, 0, NANOSECONDS,  
          new DelayedWorkQueue());  
}

private static final int INITIAL_CAPACITY = 16;  
private RunnableScheduledFuture<?>[] queue =  
    new RunnableScheduledFuture<?>[INITIAL_CAPACITY];  
private final ReentrantLock lock = new ReentrantLock();

public boolean offer(Runnable x) {  
    if (x == null)  
        throw new NullPointerException();
    RunnableScheduledFuture<?> e = (RunnableScheduledFuture<?>)x;  
    final ReentrantLock lock = this.lock;  
    lock.lock();
    try {
        // 当队列的容量不够，会扩充 50%
        int i = size;
        if (i >= queue.length)
            grow();
        size = i + 1;
        if (i == 0) {
            queue[0] = e;
            setIndex(e, 0);
        } else {  
            siftUp(i, e);  
        }  
        if (queue[0] == e) {  
            leader = null;  
            available.signal();  
        }  
    } finally {  
        lock.unlock();  
    }  
    return true;  
}

private void delayedExecute(RunnableScheduledFuture<?> task) {
    // 如果线程池关闭了，需要执行饱和策略
    if (isShutdown())  
        reject(task);  
    else {
        // 添加到队列中
        super.getQueue().add(task);  
        if (isShutdown() &&  
            !canRunInCurrentRunState(task.isPeriodic()) &&  
            remove(task))  
            task.cancel(false);  
        else
            // 判断等待队列中是否已经满了，会使用到 ThreadPoolExecutor
            ensurePrestart();  
    }  
}
void ensurePrestart() {  
    int wc = workerCountOf(ctl.get());  
    if (wc < corePoolSize)  
        addWorker(null, true);  
    else if (wc == 0)  
        addWorker(null, false);  
}