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Software Architecture in Java: Design & Development

Develop the Business Service Tier

Explore how to develop the business service tier in a Java Spring and Hibernate application. Learn to implement key operations such as finding, creating, editing, and removing records with a focus on test-driven development and proper data mapping. This lesson prepares you to handle business logic and data manipulation efficiently before moving on to the presentation tier.

We'll cover the following...

“Find all records” operation

We will start with the “find all records” operation.

Java
@RunWith( SpringJUnit4ClassRunner.class )

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

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class ProtocolServiceImplTest {

	@Autowired

	private ProtocolService service;

	@Test

	public void testFindAll() {

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

	}

}

Next, let’s learn how to code the corresponding “find all records” method in the business service.

Java
@Service

@Transactional

public class ProtocolServiceImpl implements ProtocolService {

	@Autowired

	private ProtocolDao protocolDao;

	@Autowired

	private ProtocolMapper protocolMapper;

	@Override

	public List<ProtocolDto> findAll() {

		List<Protocol> protocols = protocolDao.getAll();

		List<ProtocolDto> protocolDtos = new ArrayList<ProtocolDto>();

		for(Protocol protocol : protocols){

			protocolDtos.add(protocolMapper.mapEntityToDto(protocol));

		}

		return protocolDtos;

	}

}

Mappers

The mapper typically has two operations that are used to convert data access objects to ...