public static HourCache getInstance() {
        if (hourCache == null) {
            synchronized (Configuration.class) {
                if (hourCache == null) {
                    hourCache = new HourCache();
                }
            }
        }
        return hourCache;
    }
Cache Of hour ,for hour openapi
inlong-audit/audit-service/src/main/java/org/apache/inlong/audit/service/cache/HourCache.java