@Override
  public Page<String> listAllValidDatasets(String accountName, String containerName, String pageToken)
      throws AccountServiceException {
    return cachedAccountService.listAllValidDatasets(accountName, containerName, pageToken);
  }
call supplier to get the {@link MySqlAccountStore}
ambry-account/src/main/java/com/github/ambry/account/MySqlAccountService.java