CountDownLatch CompletableFuture

CountDownLatch和CompletableFuture是Java中的两个多线程编程工具。CountDownLatch是一个计数器，它允许一个或多个线程等待其他线程执行完毕后再继续执行。CountDownLatch的主要方法有：await()、await(long timeout, TimeUnit unit)和countDown()。调用await()方法的线程会被挂起，直到计数值为0才会继续执行。await(long timeout, TimeUnit unit)方法允许等待一定的时间后继续执行，适用于允许丢失部分数据的场景。countDown()方法将计数值减1。CountDownLatch通常用于主线程等待其他子线程任务都执行完毕后再执行，例如在多模块数据加速加载、治理大批量数据下游接口超时等场景中使用。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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