java - 如何创建通用 EJB 类

Question

我有两个名为:地址和客户端的实体。 我有一个看起来像这样的界面:

public interface IDAOEnitityFactory extends Serializable{
List<Address> findAllByClass();
}

实现如下:

 @Stateless
@Local(IDAOEnitityFactory.class)
 public class DAOEnitityFactory implements IDAOEnitityFactory {
@PersistenceContext(unitName = "MY_PU")
protected EntityManager entityManager;

@Override
public List<Address> findAllByClass() {     
    return this.getAuditReader().createQuery()
            .forRevisionsOfEntity(Address.class, true, false)
            .setMaxResults(10).getResultList();
}

所以我想做一个通用的实现，我只传递地址或客户端并 findAllByClass 返回它们。 我怎样才能做到这一点？

我有一颗 bean :

@EJB
private IDAOEnitityFactory dao;
for(Address st:dao.findAllByClass()){
                System.out.println(st.getID);               
            }

Answer 1

我认为我找到了解决方案:

public interface IDAOEnitityFactory extends Serializable{
T List<T> findAllByClass(Class c);
 }

<小时/>

@Stateless
@Local(IDAOEnitityFactory.class)
public class DAOEnitityFactory implements IDAOEnitityFactory {
@PersistenceContext(unitName = "MY_PU")
protected EntityManager entityManager;
@Override
public List<T> findAllByClass(Class c) {     
return this.getAuditReader().createQuery()
        .forRevisionsOfEntity(c, true, false)
        .setMaxResults(10).getResultList();
 }

<小时/>

@EJB
private IDAOEnitityFactory dao;
for(Object st:dao.findAllByClass(Address.class)){
            System.out.println((Address)st)st.getID);               
        }

也许还有其他解决方案。母鸡？