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Software Architecture in Java: Design & Development

Develop the Business Service Tier

Explore the development of the business service tier focusing on many-to-many self-referencing relationships. Learn how to implement and test core operations such as finding all records, creating links, removing links, and checking the presence of relationships within Java Spring applications.

We'll cover the following...

In this lesson, we will move to the business service tier.

“Find all records” operation

First, we will review the test to find all records.

Java
@RunWith( SpringJUnit4ClassRunner.class )

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

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class WorkerWorkerServiceImplTest {



	@Autowired

	private WorkerService workerService;

	

	@Autowired

	private WorkerWorkerService workerWorkerService;

	

	@Test

	public void testFindAll() {

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

	}

}

Let’s examine how to program the related method in the business tier.

Java
@Service

@Transactional

public class WorkerWorkerServiceImpl implements WorkerWorkerService {



	@Autowired

	private WorkerDao workerDao;

	

	@Autowired

	private WorkerMapper workerMapper;

	

	@Autowired

	private WorkerWorkerDao workerWorkerDao;

	

	@Override

	public List<WorkerWorkerDto> findAll() {

		List<WorkerWorkerDto> workerWorkerDtos = new ArrayList<WorkerWorkerDto>();

		List<WorkerWorker> workerList = workerWorkerDao.getAll();

		for(WorkerWorker workerWorker : workerList) {	

			WorkerWorkerDto workerWorkerDto = new WorkerWorkerDto();	

			workerWorkerDto.setWorkerId1(workerMapper.mapEntityToDto(workerWorker.getWorker1()));

			workerWorkerDto.setWorkerId2(workerMapper.mapEntityToDto(workerWorker.getWorker2()));

			workerWorkerDto.setRelationshipType(workerWorker.getRelationshipType());

			workerWorkerDtos.add(workerWorkerDto);

		}

		return workerWorkerDtos;

	}

}
...