#134 Parallel Data Aggregation from Microservices

Implement an API composition method whose theoretical execution time approaches 300ms. The method calls three external microservices. Their calls and average response times are shown below:

List<GroupDTO> GroupFeignClient.search(GroupsSearchCriteriaDTO searchDTO); // 200-350ms
UserDTO UserFeignClient.findById(String userId); // 50-160ms
ScoringDTO ScoringFeignClient.findByUserId(String userId); // 100-250ms

@Service
class SuperUserServiceImpl{
    final GroupFeignClient groupClient;
    final UserFeignClient userClient;
    ScoringFeignClient scoringClient;

    SuperUserDTO findById(String userId){
        searchDTO = GroupsSearchCriteriaDTO.builder().userId(userId).build();
        // implement an API composition method whose theoretical time approaches 300ms

        return new SuperUserDTO();
    }
}

class SuperUserDTO {
    String id;
    String name;
    String lastname;
    Float score;
    List<GroupDTO> groups;
}


class UserDTO {
    String id;
    String name;
    String lastname;
    String phone;
    String email;
}

class GroupDTO {
    String id;
    String code;
    String label;
    String division;
    String description;
    String email;
}

class ScoringDTO {
    String userId;
    Float score;
}