### Question:
IoTDBThreadPoolFactory { public static ExecutorService newCachedThreadPool(String poolName) { return Executors.newCachedThreadPool(new IoTThreadFactory(poolName)); }  static ExecutorService newFixedThreadPool(int nthreads, String poolName); static ExecutorService newFixedThreadPool(int nthreads, String poolName,
      Thread.UncaughtExceptionHandler handler); static ExecutorService newSingleThreadExecutor(String poolName); static ExecutorService newSingleThreadExecutor(String poolName,
      Thread.UncaughtExceptionHandler handler); static ExecutorService newCachedThreadPool(String poolName); static ExecutorService newCachedThreadPool(String poolName,
      Thread.UncaughtExceptionHandler handler); static ScheduledExecutorService newSingleThreadScheduledExecutor(String poolName); static ScheduledExecutorService newSingleThreadScheduledExecutor(String poolName,
      Thread.UncaughtExceptionHandler handler); static ScheduledExecutorService newScheduledThreadPool(int corePoolSize, String poolName); static ScheduledExecutorService newScheduledThreadPool(int corePoolSize, String poolName,
      Thread.UncaughtExceptionHandler handler); static ExecutorService createJDBCClientThreadPool(Args args, String poolName); static ExecutorService createJDBCClientThreadPool(Args args, String poolName,
      Thread.UncaughtExceptionHandler handler);  }### Answer:
@Test public void testNewCachedThreadPool() throws InterruptedException { String reason = "NewCachedThreadPool"; Thread.UncaughtExceptionHandler handler = new TestExceptionHandler(reason); int threadCount = 10; latch = new CountDownLatch(threadCount); ExecutorService exec = IoTDBThreadPoolFactory.newCachedThreadPool(POOL_NAME, handler); for (int i = 0; i < threadCount; i++) { Runnable task = new TestThread(reason); exec.execute(task); } try { latch.await(); assertEquals(count.get(), threadCount); } catch (InterruptedException E) { fail(); } }