dropwizard SaveOrUpdateEventListener

Question

我试着在dropwizard hibernate中使用SaveOrUpdateDateListener扩展DefaultSaveOrUpdateEventListener。当我在Applicaion类的EventListenerGroup中注册时，如下所示：

@Override
public void run(DFConfiguration configuration,
                Environment environment) throws ClassNotFoundException {
    //register custom listener into EventListener
    SessionFactory sessionFactory = hibernate.getSessionFactory();
    EventListenerRegistry listenerRegistry = sessionFactory.getSessionFactoryOptions().getServiceRegistry().getService(EventListenerRegistry.class);
    EventListenerGroup<SaveOrUpdateEventListener> evlg = listenerRegistry.getEventListenerGroup(EventType.SAVE_UPDATE);
    evlg.appendListener(new SaveOrUpdateDateListener());

}

这是SaveOrUpdateDateListener类。公共类SaveOrUpdateDateListener扩展了DefaultSaveOrUpdateEventListener {

@Override
public void onSaveOrUpdate(SaveOrUpdateEvent event) {
    logger.debug("Entering onSaveOrUpdate()");

    if (event.getObject() instanceof AuditableBase) {
        AuditableBase object = (AuditableBase) event.getObject();

        // set the Updated date/time
        object.setUpdated(new Date().getTime());

        // set the Created date/time
        if (object.getCreated() == 0) {
            object.setCreated(new Date().getTime());
        }
    }
}

}

它在部署时抛出异常：

请求的未知服务org.hibernate.event.service.spi.EventListenerRegistry，堆栈跟踪: org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:126)处请求的org.hibernate.service.UnknownServiceException:未知服务org.hibernate.event.service.spi.EventListenerRegistry

有什么想法吗？谢谢!

Answer 1

我找到了解决的办法。因为我用的是createdTime和updatedTime，所以@CreationTimestamp和@UpdateTimestamp帮我解决了这个问题。所以我根本不需要任何自定义的监听器。嗯..。

 @Column(name="createdTime", nullable = false, insertable = true,updatable = false)
 @Temporal(value = TemporalType.TIMESTAMP)
 @CreationTimestamp
 private Date createdTime;

 @Column(name="updatedTime", nullable = false, insertable = true, updatable = true)
 @Temporal(value = TemporalType.TIMESTAMP)
 @UpdateTimestamp
 private Date updatedTime;