多线程技术-CountDownLatch在业务中实践

//多线程查询
long startTime2 = System.currentTimeMillis();
CountDownLatch cdl = new CountDownLatch(dates.size());
for(Map<Integer, String> data:dates){
    Future<?> submit = executor.submit(new Runnable() {
        @Override
        public void run() {
            try {
                Detail Detail = buildTransDetail(data);
                Detail detail = detailService.queryByChannelAndTransOrderId2(Detail.getChannel(), Detail.getId());
                if (null == detail){
                    DetailContext.getUnSave().add(Detail);
                } else {
                    Detail.setUpdateTime(new Date());
                    DetailContext.getUnUpdate().add(Detail);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                cdl.countDown();
            }
        }
    });
}

try {
    //保证线程池中的所有的线程任务都完成后，主线程才会继续向下执行；
    cdl.await();
} catch (InterruptedException e) {
    e.printStackTrace();
}