每天在特定时间刷新Guava LoadingCache

问题描述

我需要每天在特定时间（例如我的午夜）刷新缓存。我有办法用Guava LoadingCache做到这一点吗？
到目前为止，我只需要在一天后使用以下代码更新缓存即可。

I need that my cache be refreshed everyday at a specific time, in my case, at midnight. I have way to do this with Guava LoadingCache?So far I only got the cache be renewed after a day, with the next code:

private final LoadingCache<String, Long> cache = CacheBuilder.newBuilder()
    .refreshAfterWrite(1, TimeUnit.DAYS)
    .build(new CacheLoader<String, Long>() {
        public Long load(String key) {
            return getMyData("load", key);
        }
}

推荐答案

下面是一段代码，该代码实现了（Java 8 ）：

Here's a code snipped that implements JB Nizeth's answer (Java 8):

long millisUntilMidnight = Duration
            .between(LocalDateTime.now(), LocalDateTime.of(LocalDate.now().plusDays(1), LocalTime.MIDNIGHT))
            .toMillis();
Executors.newSingleThreadScheduledExecutor()
            .scheduleAtFixedRate(() -> cache.invalidateAll(), millisUntilMidnight,
            TimeUnit.DAYS.toMillis(1), TimeUnit.MILLISECONDS);

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