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Software Architecture in Java: Design & Development

Develop the Business Service Tier

Explore how to develop the business service tier by implementing key operations such as find, create, edit, and remove records using class table inheritance in Java Spring. Understand how to map data access objects to entities and integrate service methods with the data access tier for effective database management.

We'll cover the following...

“Find all records” operation

We will proceed with the test for the “find all records” operation.

Java
@RunWith( SpringJUnit4ClassRunner.class )

@ContextConfiguration( locations = { "classpath:context.xml" } )

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class EmployeeServiceImplTest {

	@Autowired

	private EmployeeService service;

	@Test

	public void testFindAll() {

		Assert.assertEquals(0L, service.findAll().size());

	} 

}

Let’s look at how to code the corresponding “find all records” method in the business service.

Java
@Service

@Transactional

public class EmployeeServiceImpl implements EmployeeService {



	@Autowired

	private EmployeeDao employeeDao;

	

	@Autowired

	private EmployeeMapper employeeMapper;



	@Override

	public List<EmployeeDto> findAll() {

		List<Employee> employees = employeeDao.getAll();

		List<EmployeeDto> employeeDtos = new ArrayList<EmployeeDto>();

		for(Employee employee : employees){

			employeeDtos.add(employeeMapper.mapEntityToDto(employee));

		}

		return employeeDtos;

	} 

}

Mappers

The mapper has two main operations which are used to convert data access ...