@Override
 public Boolean call() throws Exception {
   return SNAAServiceHelper.getSNAAService(wsEndpointUrl)
       .isAuthorized(secretAuthenticationKeys, action);
 }
 @Override
 public List<SecretAuthenticationKey> call() throws Exception {
   SNAA federatorSNAA = SNAAServiceHelper.getSNAAService(wsEndpointUrl);
   List<SecretAuthenticationKey> saks = federatorSNAA.authenticate(authenticationTriples);
   return saks;
 }