hibernate - 如何使用 spring boot 1.5.x 配置 "hibernate.integrator_provider"

Question

我正在使用 springboot 1.5.x 并尝试在 this 之后实现事件监听器教程。

我遇到的阻碍是SpringBoot 1.5.x无法设置hibernate integrator。 我试过在properties.yml中配置integrator像下面的代码，但它抛出一个异常，不能将字符串转换为 Integrator:

spring:
  jpa:
    properties:
      hibernate.integrator_provider: com.xxxxx.RootAwareEventListenerIntegrator

Here是一个相关的问题，但提供的解决方案不适用于 springBoot 1.5.x。

Answer 1

我从 here 找到了一个可用的解决方案.它不使用积分器，而是将所有事件监听器一一添加。下面是我的代码:

public class RootAwareInsertEventListener implements PersistEventListener {

    public static final RootAwareInsertEventListener INSTANCE = new RootAwareInsertEventListener();

    @Override
    public void onPersist(PersistEvent event) throws HibernateException {
        final Object entity = event.getObject();

        if (entity instanceof RootAware) {
            RootAware rootAware = (RootAware) entity;
            Object root = rootAware.getRoot();
            event.getSession().lock(root, LockMode.OPTIMISTIC_FORCE_INCREMENT);

            log.info("Incrementing {} entity version because a {} child entity has been inserted",
                    root, entity);
        }
    }

    @Override
    public void onPersist(PersistEvent event, Map createdAlready)
            throws HibernateException {
        onPersist(event);
    }
}

@Component
public class HibernateListenerConfigurer {

    @PersistenceUnit
    private EntityManagerFactory emf;

    @PostConstruct
    protected void init() {
        SessionFactoryImpl sessionFactory = emf.unwrap(SessionFactoryImpl.class);
        EventListenerRegistry registry = sessionFactory.getServiceRegistry().getService(EventListenerRegistry.class);
        registry.getEventListenerGroup(EventType.PERSIST).appendListener(RootAwareInsertEventListener.INSTANCE);
        registry.getEventListenerGroup(EventType.FLUSH_ENTITY).appendListener(RootAwareUpdateAndDeleteEventListener.INSTANCE);

    }
}