如何從JPA EntityManager中清除Hibernate緩存？

我有一個Hibernate爲我緩存的實體應用程序。除非我現在必須清除緩存（由於異步數據更改），所以效果很好。（據我可以告訴）如何從JPA EntityManager中清除Hibernate緩存？

query.setHint(QueryHints.HINT_CACHEABLE, true); 
query.setHint(QueryHints.HINT_CACHE_REGION, "CACHE_REGION_NAME");

實體具有適當的註解：查詢緩存如下

@Cacheable 
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE, region = "CACHE_REGION_NAME")

到目前爲止好。現在我需要清除緩存。我做到以下幾點：

@Override 
@Transactional(isolation = Isolation.SERIALIZABLE, propagation = Propagation.REQUIRES_NEW, value = "xProdTransaction") 
public void clearClientCache() throws CacheClearingException { 
    clearSession(); 
    clearCacheRegion(); 
} 

void clearSession() throws CacheClearingException { 
    Session session = null; 
    try { 
     session = em.unwrap(Session.class); 

     if(session==null) { 
      throw new CacheClearingException("Unable to find valid session"); 
     } else { 
      session.clear(); 
     } 
    } catch(PersistenceException pe) { 
     throw new CacheClearingException("Unable to clear session", pe); 
    } 
} 

void clearCache() throws CacheClearingException { 
    Cache cache = null; 
    try { 
     SessionFactory sessionFactory = em.unwrap(SessionFactory.class); 
     if(sessionFactory == null) { 
      throw new CacheClearingException("Unable to find valid session factory"); 
     } 

     cache = sessionFactory.getCache(); 
     if (cache == null) { 
      throw new CacheClearingException("Unable to find valid cache"); 
     } 

     cache.evictCollectionRegion("CACHE_REGION_NAME"); 
    } catch (PersistenceException pe) { 
     throw new CacheClearingException("Unable to clear cache", pe); 
    } 
}

會話高速緩存是沒有問題的，但我得到一個異常試圖從EntityManager的解開了一個SessionFactory：

com.cambia.shc.core.dao.xproduct.CacheClearingException: Unable to clear cache 
    at com.cambia.shc.core.dao.xproduct.CacheManagerImpl.clearCache(CacheManagerImpl.java:63) 
    at com.cambia.shc.core.dao.xproduct.CacheManagerImpl.clearClientCache(CacheManagerImpl.java:29) 
... 
Caused by: javax.persistence.PersistenceException: Hibernate cannot unwrap interface org.hibernate.SessionFactory 
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.unwrap(AbstractEntityManagerImpl.java:1524) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:291) 
    at com.sun.proxy.$Proxy66.unwrap(Unknown Source) 
    at  com.cambia.shc.core.dao.xproduct.CacheManagerImpl.clearCache(CacheManagerImpl.java:51) 
    ... 94 more

我JPA豆在Spring配置如下：

<bean id="jpaDialect" class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/> 

<bean id="xproductEntityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> 
    <property name="persistenceUnitName" value="xproduct"/> 
    <property name="jpaProperties"> 
     <props> 
      <prop key="hibernate.cache.use_query_cache">true</prop> 
      <prop key="hibernate.cache.use_second_level_cache">true</prop> 
      <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop> 
      <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop> 
      <prop key="hibernate.generate_statistics">true</prop> 
     </props> 
    </property> 
    <property name="jpaDialect" ref="jpaDialect" /> 
</bean> 

<bean id="xProdTransaction" class="org.springframework.orm.jpa.JpaTransactionManager"> 
    <property name="entityManagerFactory" ref="xproductEntityManagerFactory"/> 
</bean>

任何想法？

謝謝！

來源

2015-08-26 Kramer

你不能直接通過unwrap獲得每個班級。您可以先獲得Session，然後從中獲取SessionFactory：

em.unwrap(Session.class).getSessionFactory();

來源

2015-08-27 09:02:21

謝謝。這很好！ – Kramer

如何從JPA EntityManager中清除Hibernate緩存？

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