java - 永远不会调用 onFlushDirty Hibernate Interceptor 方法

Question

问题: 为什么从未调用 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;
  }
}

我的拦截器:

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像我的方式]

每次更改 Folder 实体中的某些内容时，我都希望更新 modified 时间戳，folderPosition 除外。同时 folderPosition 应该是持久的而不是暂时的(意味着导致实体变脏)。

由于我使用 Spring Transactional 和 Hibernate 模板，所以有一些细微差别:

1) 我无法在每个 setter 的末尾更新修改后的时间戳，例如:

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) 我不能手动调用 setModified，因为它有大约 25 个字段，每个字段的 setXXX 分散在整个应用程序中。而且我无权进行重构。

@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

您需要扩展findDirty 方法而不是onFlushDirty。检查this tutorial引用 GitHub 工作示例的详细说明。