应用LoadingCache缓存每天数据库第一条数据并保留

 private LoadingCache<String, Integer> minId = CacheBuilder.newBuilder().expireAfterWrite(1L, TimeUnit.DAYS).build(new CacheLoader<String, Integer>() {    @Override    public Integer load(String mixdate) throws Exception {      Date date = LocalDate.parse(StringUtils.substringAfter(s, "@")).toDate();      // 在本地没有缓存的时候会调用该办法进行加载,将获取的值进行缓存并返回后果      if (ACTIVE_COUNTER.startsWith(mixdate)) {        LoginLog loginLog = loginLogRepository.getTopByLoginTimeBeforeOrderByIdDesc(date);        if (loginLog != null) {          return loginLog.getId();        }      } else if (PLAYED_COUNTER.startsWith(mixdate)) {        ViewHistory viewHistory = viewHistoryRepository.getTopByViewtimeBeforeOrderByIdDesc(date);        if (viewHistory != null) {          return viewHistory.getId();        }      } else if (ADCLICK_COUNTER.startsWith(mixdate)) {        AdvClickHistory advClickHistory = advClickHistoryRepository.getTopByCreateTimeBeforeOrderByIdDesc(date);        if (advClickHistory != null) {          return advClickHistory.getId();        }      }      return 0;    }  });
minId.getUnchecked(StringUtils.join(type, "@", date));

在这里取出当天的数据key,因为每天date都不一样,所以会获取当天的第一条数据,并缓存起来!