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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 'find all,' create, remove, and isPresent operations for many-to-many bi-directional relationships between Client and Account entities. Understand how these service methods interact with data access layers and support test-driven development.

We'll cover the following...

“Find all records” operation

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

Java
@RunWith( SpringJUnit4ClassRunner.class )

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

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class ClientAccountServiceImplTest {



	@Autowired

	private ClientService clientService;

	

	@Autowired

	private AccountService accountService;

	

	@Autowired

	private ClientAccountService clientAccountService;

	

	@Test

	public void testFindAll() {

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

	}

}

Let’s review how to code this method in the business service.

Java
@Service
@Transactional
public class ClientAccountServiceImpl implements ClientAccountService {
	@Autowired
	private ClientDao clientDao;
	
	@Autowired
	private ClientMapper clientMapper;
	
	@Autowired
	private AccountDao accountDao;
	
	@Autowired
	private AccountMapper accountMapper;
	
	@Autowired
	private ClientAccountDao clientAccountDao;
	@Override
	public List<ClientAccountDto> findAll() {
		List<ClientAccountDto> clientAccountDtos = new ArrayList<ClientAccountDto>();
		List<Client> clientList = clientAccountDao.getAll();
		for(Client client : clientList) {			
			ClientDto clientDto = clientMapper.mapEntityToDto(client);			
			Set<Account> accounts = client.getAccounts();
			for(Account account : accounts) {
				ClientAccountDto clientAccountDto = new ClientAccountDto();
				clientAccountDto.setClientDto(clientDto);
				AccountDto accountDto = accountMapper.mapEntityToDto(account);
				clientAccountDto.setAccountDto(accountDto);
				clientAccountDtos.add(clientAccountDto);
			}			
		}
		return clientAccountDtos;
	}
}

Create operation

Let’s move on to the create test operation that creates one incidence of the Client ...