cn.guoyukun.spring.jpa.repository.hibernate.HibernateUtils.java Source code

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Here is the source code for cn.guoyukun.spring.jpa.repository.hibernate.HibernateUtils.java

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/**
 * Copyright (c) 2005-2012 https://github.com/zhangkaitao
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package cn.guoyukun.spring.jpa.repository.hibernate;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;

import org.hibernate.Cache;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.jpa.HibernateEntityManagerFactory;

/**
 * ? jpa api ?hibernateapi
 * <p>User: 
 * <p>Date: 13-5-23 ?6:24
 * <p>Version: 1.0
 */
public class HibernateUtils {

    /**
     * ?jpa EntityManager ? hibernate Session API
     *
     * @param em
     * @return
     */
    public static Session getSession(EntityManager em) {
        return (Session) em.getDelegate();
    }

    /**
     * ?jpa EntityManager ? hibernate SessionFactory API
     *
     * @param em
     * @return
     * @see #getSessionFactory(javax.persistence.EntityManagerFactory)
     */
    public static SessionFactory getSessionFactory(EntityManager em) {
        return getSessionFactory(em.getEntityManagerFactory());
    }

    /**
     * ?jpa EntityManagerFactory ? hibernate SessionFactory API
     * 
     * @param emf
     * @return
     */
    public static SessionFactory getSessionFactory(EntityManagerFactory emf) {
        //TODO: jetty?, TomcatOK
        HibernateEntityManagerFactory hef = (HibernateEntityManagerFactory) emf;
        //       org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean a;

        SessionFactory sf = hef.getSessionFactory();
        return sf;
    }

    /**
     * ? jpa EntityManager ?hibernate Cache API
     *
     * @param em
     * @return
     * @see #getCache(javax.persistence.EntityManagerFactory)
     */
    public static Cache getCache(EntityManager em) {
        return getCache(em.getEntityManagerFactory());
    }

    /**
     * ?jpa EntityManagerFactory ? hibernate Cache API
     *
     * @param emf
     * @return
     */
    public static Cache getCache(EntityManagerFactory emf) {
        return getSessionFactory(emf).getCache();
    }

    /**
     * 
     *
     * @param em
     */
    public static void evictLevel1Cache(EntityManager em) {
        em.clear();
    }

    /**
     * ?jpa EntityManager 
     *
     * @param em
     * @see #evictLevel2Cache(javax.persistence.EntityManagerFactory)
     */
    public static void evictLevel2Cache(EntityManager em) {
        evictLevel2Cache(em.getEntityManagerFactory());
    }

    /**
     * ?jpa EntityManagerFactory  
     * 1?
     * 2??
     * 3?
     * ?
     * jpa Cache api ?evict ?
     *
     * @param emf
     * @see org.hibernate.ejb.EntityManagerFactoryImpl.JPACache#evictAll()
     */
    public static void evictLevel2Cache(EntityManagerFactory emf) {
        Cache cache = HibernateUtils.getCache(emf);
        cache.evictEntityRegions();
        cache.evictCollectionRegions();
        cache.evictDefaultQueryRegion();
        cache.evictQueryRegions();
        cache.evictNaturalIdRegions();
    }
}