[spring transaction]，service实现类中非事务方法直接调用自身事务方法致使事务无效的缘由

时间 2019-11-20

标签 spring transaction service 实现中非事务方法直接调用自身致使无效缘由栏目 Spring 繁體版

原文原文链接

首先，准备service接口，两个spring

public interface AccountService {

    public void createAccount(Account account, int throwExpFlag) throws Exception;

    public void createAccountShell(Account account, int i) throws Exception;

}

public interface RoleService {
    
    public void createAccountShell(Account account, int i) throws Exception;

}

相关implide

@Service
public class AccountServiceImpl implements AccountService {

    @Resource
    private AccountDAO accountDAO;
    
    @Override
    @Transactional
    public void createAccount(Account account, int throwExpFlag) throws Exception {
        accountDAO.save(account);
        RoleServiceImpl.throwExp(throwExpFlag);
    }

    @Override
    public void createAccountShell(Account account, int i) throws Exception {
        this.createAccount(account, i);
    }

}

@Service
public class RoleServiceImpl implements RoleService {

    @Autowired
    AccountService accountService;
    
    public static void throwExp(int throwExpFlag) throws Exception {
        if (throwExpFlag == 0) {
            throw new RuntimeException("<< rollback transaction >>");
        } else if (throwExpFlag != 1) {
            throw new Exception("<< do not rollback transaction >>");
        }
    }

    @Override
    public void createAccountShell(Account account, int i) throws Exception {
        accountService.createAccount(account, i);        
    }

}

测试类单元测试

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"classpath:spring/spring-dao.xml", "classpath:spring/spring-service.xml"})
public class ServiceTransactionTest extends TestCase {

        public static Account account;

        static {
                account = new Account();
        account.setId(779);
        account.setUsername("779 USER");
        account.setPassword("0123456");
        }

    @Autowired
    AccountService accountService;
    
    @Autowired
    RoleService roleService;
    
    @Test
    public void test_1() throws Exception {
        this.accountService.createAccount(account, 0);
    }

        @Test
    public void test_2() throws Exception {
        this.accountService.createAccountShell(account, 0);
    }

        @Test
    public void test_3() throws Exception {
        roleService.createAccountShell(account, 0);
    }

}

（一）对测试类的test_1方法进行单元测试时，因为AccountServiceImpl.createAccount方法显示配置了事务(@Transactional)，因此spring正常接管事务。测试

（二）对测试类的test_2方法进行单元测试时，AccountServiceImpl.createAccountShell方法并无显示配置事务，但其却调用了AccountServiceImpl.createAccount方法(已配事务)。然并卵，当抛出RuntimeException时，没有rollback，说明spring没有接管事务。（猜想缘由：AccountServiceImpl.createAccountShell 被显示调用时，spring是知道的，但因为AccountServiceImpl.createAccountShell没有显示配置事务，spring并无对此进行事务的管理，在AccountServiceImpl.createAccountShell内部虽然调用了配置了事务的createAccount方法，但spring并不知道或没法肯定事务上下文，因此结果是并无由于抛出的运行时异常而进行rollback）。this

（三）测试test_3，虽然RoleServiceImpl.createAccountShell一样没有配置事务，但抛出RuntimeException时，spring接管了事务并rollback。（猜想缘由：虽然RoleServiceImpl.createAccountShell没有配置事务，但其内部调用另外一个service实例的方法，即AccountService.createAccount时，spring对此是获知的，又由于AccountServiceImpl.createAccount显示配置了事务，因此spring接管了事务）。spa

（四）若是在AccountServiceImpl.createAccountShell配置了事务，那么在执行test_2时，spring是能够接管事务的。code