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使用CountLatch实现异步等待

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10.async-wait-with-latch

利用CountLatch异步等待

摘自JavaFx源码

com.sun.javafx.application.LauncherImpl#launchApplication(java.lang.Class<? extends javafx.application.Application>, java.lang.Class<? extends javafx.application.Preloader>, java.lang.String[])

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// 接收异常
private static volatile RuntimeException launchException = null;


final CountDownLatch launchLatch = new CountDownLatch(1);
Thread launcherThread = new Thread(() -> {
    try {
        launchApplication1(appClass, preloaderClass, args);
    } catch (RuntimeException rte) {
        launchException = rte;
    } catch (Exception ex) {
        launchException =
            new RuntimeException("Application launch exception", ex);
    } catch (Error err) {
        launchException =
            new RuntimeException("Application launch error", err);
    } finally {
    // countDown
        launchLatch.countDown();
    }
});
launcherThread.setName("JavaFX-Launcher");
launcherThread.start();
// 异步线程启动

// Wait for FX launcher thread to finish before returning to user
try {
    launchLatch.await();
} catch (InterruptedException ex) {
    throw new RuntimeException("Unexpected exception: ", ex);
}

if (launchException != null) {
    throw launchException;
}