Validate Ticket Service Layer

In this lesson, we'll implement the validate ticket service layer.

Repository Setup

First, we need to create a repository for ticket validations. This forms the foundation for our database interactions:

@Repository
public interface TicketValidationRepository extends JpaRepository<TicketValidation, UUID> {

}

Service Interface

The service interface defines two methods for validating tickets - one using a QR code and another for manual validation:

public interface TicketValidationService {
  TicketValidation validateTicketByQrCode(UUID qrCodeId);
  TicketValidation validateTicketManually(UUID ticketId);
}

Service Implementation

The implementation handles the business logic for ticket validation:

@Service
@RequiredArgsConstructor
@Transactional
public class TicketValidationServiceImpl implements TicketValidationService {

  private final QrCodeRepository qrCodeRepository;
  private final TicketValidationRepository ticketValidationRepository;
  private final TicketRepository ticketRepository;

  @Override
  public TicketValidation validateTicketByQrCode(UUID qrCodeId) {
    QrCode qrCode = qrCodeRepository.findByIdAndStatus(qrCodeId, QrCodeStatusEnum.ACTIVE)
        .orElseThrow(() -> new QrCodeNotFoundException(
            String.format(
                "QR Code with ID %s was not found", qrCodeId
            )
        ));

    Ticket ticket = qrCode.getTicket();

    return validateTicket(ticket);
  }

  private TicketValidation validateTicket(Ticket ticket) {
    TicketValidation ticketValidation = new TicketValidation();
    ticketValidation.setTicket(ticket);
    ticketValidation.setValidationMethod(TicketValidationMethod.QR_SCAN);

    TicketValidationStatusEnum ticketValidationStatus = ticket.getValidations().stream()
        .filter(v -> TicketValidationStatusEnum.VALID.equals(v.getStatus()))
        .findFirst()
        .map(v -> TicketValidationStatusEnum.INVALID)
        .orElse(TicketValidationStatusEnum.VALID);

    ticketValidation.setStatus(ticketValidationStatus);

    return ticketValidationRepository.save(ticketValidation);
  }

  @Override
  public TicketValidation validateTicketManually(UUID ticketId) {
    Ticket ticket = ticketRepository.findById(ticketId)
        .orElseThrow(TicketNotFoundException::new);
    return validateTicket(ticket);
  }
}

The implementation includes these key features:

The validateTicketByQrCode method looks up an active QR code and validates the associated ticket.
The validateTicketManually method looks up a ticket directly by ID and validates it.
The private validateTicket method contains the shared validation logic.
Tickets can only be validated once - subsequent validations will return invalid status.

Summary

Implemented the ticket validation service layer functionality