我的实现很简单，但是没有按照预期执行。 我正在使用以下缓存库：https://github.com/ben-manes/caffeine

当我部署应用程序时：

Calls Controller Endpoint -> First time loads data to cache (works fine) -> Wait 10 seconds -> refresh data to cache -> wait 10 seconds -> ... over and over

首次加载效果很好。问题是10秒钟后，数据重新加载无法运行。

控制器

   MyData myData = MyData.getInstance();
   Map<String,List<String>> tableone = myData.cache.get("tableone");

MyData类

public LoadingCache<String,Map<String,List<String>>> cache;

public static MyData getInstance() {
    if (instance == null) {
        synchronized (MyData.class) {
            if (instance == null) {
                instance = new MyData();
            }
        }
    }
    return instance;
}

 private MyData() {
    this.cache = caffeine.newBuilder()
            .refreshAfterWrite(10,TimeUnit.SECONDS)
            .build(key -> MyData.getInstance().loadData(key));
}

private Map<String,List<String>> loadData(String key) {
       // Loads Data. This is only called once and never again!
}

任何线索为何refreshAfterWrite不会每10秒运行一次？

谢谢