class CachingHiveMetastore implements HiveMetastore {

    @Override
    public Set<String> listRoles()
    {
        return get(rolesCache, "");
    }

    protected  CachingHiveMetastore(HiveMetastore delegate, Executor executor, OptionalLong expiresAfterWriteMillis, OptionalLong refreshMills, long maximumSize, StatsRecording statsRecording);

}