Question

我有一个Hibernate为我提供缓存的实体的应用程序。工作得很好，除了我现在必须清除缓存（由于异步数据更改）。查询缓存如下：

audioDemo.html:42 audio = [object HTMLAudioElement]
audioDemo.html:43 audio src = file:///C:/xampp/htdocs/enhzflep/audio/voice_welcomeback.mp3
audioDemo.html:44 audio dur = 1.68
audioDemo.html:42 audio = [object HTMLAudioElement]
audioDemo.html:43 audio src = file:///C:/xampp/htdocs/enhzflep/audio/Some%20Chords.mp3
audioDemo.html:44 audio dur = 444.186122

实体有适当的注释（据我所知）：

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

到目前为止一切顺利。现在我需要清除缓存。我做了以下事情：

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

会话缓存没问题，但是我尝试从EntityManager中解包SessionFactory时遇到异常：

@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);
    }
}

我的JPA bean在Spring中配置如下：

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

有什么想法吗？

谢谢！

如何从JPA EntityManager中清除Hibernate缓存？

0 个答案: