import java.util.concurrent.ThreadPoolExecutor; //导入方法依赖的package包/类
public void testPurge() throws InterruptedException {
final CountDownLatch threadStarted = new CountDownLatch(1);
final CountDownLatch done = new CountDownLatch(1);
final BlockingQueue q = new ArrayBlockingQueue<>(10);
final ThreadPoolExecutor p =
new ThreadPoolExecutor(1, 1,
LONG_DELAY_MS, MILLISECONDS,
q);
try (PoolCleaner cleaner = cleaner(p, done)) {
FutureTask[] tasks = new FutureTask[5];
for (int i = 0; i < tasks.length; i++) {
Callable task = new CheckedCallable() {
public Boolean realCall() throws InterruptedException {
threadStarted.countDown();
await(done);
return Boolean.TRUE;
}};
tasks[i] = new FutureTask(task);
p.execute(tasks[i]);
}
await(threadStarted);
assertEquals(tasks.length, p.getTaskCount());
assertEquals(tasks.length - 1, q.size());
assertEquals(1L, p.getActiveCount());
assertEquals(0L, p.getCompletedTaskCount());
tasks[4].cancel(true);
tasks[3].cancel(false);
p.purge();
assertEquals(tasks.length - 3, q.size());
assertEquals(tasks.length - 2, p.getTaskCount());
p.purge(); // Nothing to do
assertEquals(tasks.length - 3, q.size());
assertEquals(tasks.length - 2, p.getTaskCount());
}
}