public static HalfHourCache getInstance() {
        if (halfHourCache == null) {
            synchronized (Configuration.class) {
                if (halfHourCache == null) {
                    halfHourCache = new HalfHourCache();
                }
            }
        }
        return halfHourCache;
    }
Cache Of minute 30 ,for minute 30 openapi
inlong-audit/audit-service/src/main/java/org/apache/inlong/audit/service/cache/HalfHourCache.java