java – 如何处理将依赖项注入富域模型？

Person person = new Person(firstname,lastname);
// weird
peopleService.save(person);
// good (save is @Transactional)
person.save();

Mail mail = new Mail(to,subject,body);
// weird
mailService.send(mail);
// good (send is @Transactional)
mail.send();

我们还没有做过任何性能比较.到目前为止,我们根本没有觉得有必要这样做.

编辑：这是人类的样子：

@Configurable("person")
public class Person {
    private IPersonDAO _personDAO;
    private String _firstname;
    private String _lastname;

    // SNIP: some constructors,getters and setters

    @Transactional(rollbackFor = DataAccessException.class)
    public void save() {
        _personDAO.save(this);
    }

    @Transactional(readOnly = true)
    public List<Role> searchRoles(Company company) void{
        return _personDAO.searchRoles(this,company);
    }

    // it's getting more interesting for more complex methods
    @Transactional(rollbackFor = DataAccessException.class)
    public void resignAllRoles(Company company) {
        for (Role role : searchRoles(company)) {
            role.resign();
        }
    }
}

// the implementation now looks like this
personService.getPerson(id).resignAllRoles(company);

// instead of this
roleService.resignAll(personService.searchRoles(personService.getPerson(id),company));

这就是Spring配置：

<context:spring-configured />
<bean id="person" class="org.example.model.Person" lazy-init="true">
  <property name="personDAO" ref="personDAO" />
</bean>

注意：如您所见,周围仍有服务,例如：搜索对象(personService.getPerson(id))但是对传递的对象(例如人)进行操作的所有方法都将移动到该类本身(即person.save()而不是personService.save(person)).该方法本身保持不变,适用于任何底层数据访问层(纯JDBC,Hibernate,JPA,……).它只是移动到它所属的地方.