Question

问题： 为什么永远不会调用MyInterceptor#onFlushDirty？

我在{/ p>等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政策看起来不像我的方式]

每次我更改modified实体EXCEPT Folder中的内容时，我都希望更新folderPosition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，因此存在一些细微差别：

1）我不能在每个setter的末尾更新修改后的时间戳，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，每个字段的setXXX分散在整个应用中。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(); 
  }   
  ....
}

Answer 1

您需要将findDirty方法扩展为onFlushDirty。请参阅GitHub工作示例，查看this tutorial以获取详细说明。

Hibernate：永远不会调用MyInterceptor＃onFlushDirty

1 个答案: