java – Hibernate：永远不会调用MyInterceptor#onFlushDirty

我在xml配置中扩展AbstractEntityManagerFactoryBean

<bean id="myEntityManagerFactory" parent="abstractEntityManagerFactoryBean" abstract="true">
  <property name="entityInterceptor">
    <bean class="xxxx.MyInterceptor"/>
  </property>
</bean>
<bean id="abstractEntityManagerFactoryBean" class="xxxx.MyEntityManagerFactoryBean"/>

MyEntityManagerFactoryBean

public class MyEntityManagerFactoryBean extends AbstractEntityManagerFactoryBean implements LoadTimeWeaverAware {
  private Interceptor entityInterceptor;

  public Interceptor getEntityInterceptor() {
    return entityInterceptor;
  }

  public void setEntityInterceptor(Interceptor interceptor) {
    entityInterceptor = interceptor;
  }
}

MyInterceptor：

public class MyInterceptor extends EmptyInterceptor {

    public MyInterceptor() {
        System.out.println("init"); // Works well 
    }
    // PROBLEM - is never called
    @Override
    public boolean onFlushDirty(Object entity,Serializable id,Object[] currentState,Object[] previousState,String[] propertyNames,Type[] types) {

        if (entity instanceof File) {
            .....
        }
        return false;
    }
}

更新：[解释为什么自定义脏策略看起来不是我的方式]

我想在每次更改文件夹实体EXCEPT folderPosition中的内容时更新修改时间戳.同时,folderPosition应该是持久的而不是瞬态的(意味着导致实体变脏).

由于我使用的是Spring Transactional和Hibernate模板,因此有一些细微差别：

1)我无法更新每个setter末尾的修改时间戳,如：

public void setXXX(XXX xxx) {
  //PROBLEM: Hibernate templates collect object via setters,//means simple get query will cause multiple 'modified' timestamp updates
  this.xxx = xxx;
  this.modified = new Date();
}

2)我无法手动调用setModified,因为它有大约25个字段,并且每个字段的setXXX分散在整个应用程序中.我没有权力进行重构.

@Entity
public class Folder {

  /**
   * GOAL: Changing of each of these fields except 'folderPosition' should cause 
   * 'modified' timestamp update
   */
  private long id;
  private String name;
  private Date created;
  private Date modified;
  private Integer folderLocation;

  @PreUpdate
  public void preUpdate() {
     //PROBLEM : change modified even if only location field has been changed!
     //PROBLEM: need to know which fields have been updated!
     modified = new Date(); 
  }   
  ....
}