Yazılım Mimarisi - Hexagonal Architecture İle Repository

Giriş

Domain sadece bir arayüzü yani portu biliyor.

Örnek

Elimizde şöyle bir arayüz olsun

public interface StudentRepository {

    Student save(Student student);
    Optional<Student> retrieveStudentWithEmail(ContactInfo contactInfo);
    Publisher<Student> saveReactive(Student student);

}

Bu arayüz için domain tarafında test yazalım

public class StudentRepositoryTest {

  StudentRepository studentRepository;

  @Test
  public void shouldCreateStudent() {
    Student expected = ...;
    Student actual = studentRepository.save(expected);
    ...
  }

  @Test
  public void shouldUpdateExistingStudent() {
    Student expected = randomExistingStudent();
    Student actual = studentRepository.save(expected);
    ...
  }
}

Şimdi bellekte repository gerçekleştirimi yani adapter için test yazalım

public class StudentRepositoryInMemoryIT extends StudentRepositoryTest {

  @BeforeEach
  public void setup() {
    super.studentRepository = new StudentRepositoryInMemory();
  }
}

Şimdi de gerçek veri tabanı gerçekleştirimi yani adapter için test yazalım. Burada SpringBoot kullanılıyor

@Testcontainers
@ContextConfiguration(classes = {PersistenceConfig.class})
@DataJpaTest
@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
public class StudentRepositoryJpaIT extends StudentRepositoryTest {

  @Autowired
  public StudentRepository studentRepository;

  @Container
  public static PostgreSQLContainer container = new PostgreSQLContainer("postgres:latest")
    .withDatabaseName("students_db")
    .withUsername("sa")
    .withPassword("sa");


  @DynamicPropertySource
  public static void overrideProperties(DynamicPropertyRegistry registry){
    registry.add("spring.datasource.url", container::getJdbcUrl);
    registry.add("spring.datasource.username", container::getUsername);
    registry.add("spring.datasource.password", container::getPassword);
    registry.add("spring.datasource.driver-class-name", container::getDriverClassName);
  }

  @BeforeEach
  public void setup() {
    super.studentRepository = studentRepository;
  }
}