async.waterfall([
                function(step) {

                  console.log('ASSSSSSSSYNC in user here' + identifier);

                  switch(identifier) {
                    case 'user':
                      //Models.CodeUsage.countByUser(identifier, step);
                      step(null, 1);
                      break;
                    case 'cim':
                      step(null, 0);
                      break;
                  }

                }
              ], function(err, identifier_uses) {
                if (err) { return callback(err); }
                if (identifier_uses >= max_identifier_uses) {
                  console.log('- ' + identifier_uses + ' > ' + max_identifier_uses);
                  return false;
                }

                console.log('- ' + identifier_uses + ' <= ' + max_identifier_uses);

                return true;
              });