go有没有间隔时间更新内存缓存的库？

缓存元素少用它还无所谓, O(n) 的过期检查

func (c *cache) DeleteExpired() {
    var evictedItems []keyAndValue
    now := time.Now().UnixNano()
    c.mu.Lock()
    for k, v := range c.items {
        // "Inlining" of expired
        if v.Expiration > 0 && now > v.Expiration {
            ov, evicted := c.delete(k)
            if evicted {
                evictedItems = append(evictedItems, keyAndValue{k, ov})
            }
        }
    }
    c.mu.Unlock()
    for _, v := range evictedItems {
        c.onEvicted(v.key, v.value)
    }
}