強制異步操作​​阻塞當前線程

Question

我有一個API只支持異步做一些操作，我想強制它阻止我的線程。

static void doWorkSync(Worker worker) { 
    final Condition condition = new ReentrantLock().newCondition(); 
    worker.doWorkAsync(() -> condition.signal()); 
    try { 
    condition.await(); 
    } catch (InterruptedException e) { 
    throw new AssertionError(e); 
    } 
} 

正如上面所使用的，條件是這種情況最激烈的解決方案嗎？

Answer 1

CountDownLatch是你在找什麼！

static void doWorkSync(Worker worker) { 
    final CountDownLatch latch = new CountDownLatch(1); 
    worker.doWorkAsync(() -> latch.countDown()); 
    try { 
    latch.await(); 
    } catch (InterruptedException e) { 
    throw new AssertionError(e); 
    } 
}