Question

我有一个带有事务注释的类：

@Service
@EnableTransactionManagement(order=2000)
public class UserManagementServiceImpl implements UserManagementService {
    @Transactional
    public User addUser(User user) throws AlreadyExistException {
        // ...
    }
}

我有一个Aspect类：

@Component
@Aspect
public class PublisherAspect {
    @Around("execution(* com.toi.expresso.service.UserManagementService.addUser(..))")
    public User publishAddUserEvent(ProceedingJoinPoint jp) {
        // ...
    }
}

我的@Around注释在addUser保存数据库中的数据之前执行。请建议我在数据库中保存数据后如何执行@Around。

Answer 1

您方面的有趣部分是...，即建议机构。假设您的addUser方法确实返回User而不是void（我期望的）或其他任何方法，您可以将切入点缩小到实际拥有User的方法返回类型，以避免返回其他类型的方法的问题。

@Component
@Aspect
public class PublisherAspect {
    @Around("execution(User com.toi.expresso.service.UserManagementService.addUser(..))")
    public User publishAddUserEvent(ProceedingJoinPoint jp) {
        // Do something before method execution
        User user = jp.proceed();
        // Do something after method execution
        return user;
    }
}

如果要匹配所有返回类型，则使用更通用的解决方案：

@Component
@Aspect
public class PublisherAspect {
    @Around("execution(* com.toi.expresso.service.UserManagementService.addUser(..))")
    public Object publishAddUserEvent(ProceedingJoinPoint jp) {
        // Do something before method execution
        Object result = jp.proceed();
        // Do something after method execution
        return result;
    }
}

Answer 2

是'adduser'正在返回User对象。但是，如果我正在检查同一用户的数据库，则返回空集后，在持有用户对象之后。

@Component
@Aspect
public class PublisherAspect {
    @Around("execution(User com.toi.expresso.service.UserManagementService.addUser(..))")
    public User publishAddUserEvent(ProceedingJoinPoint jp) 
       {
          // Do something before method execution
          User user = jp.proceed();
           //checking in database(Sending message to other application but that application didn't find user in same db)
            return user;
        }
    }
}

@Around Aspect在@transaction Annotation Spring之前执行

2 个答案: