HibernateMetrics.java 文件源码

/**
 * Get the {@code Statistics} object from the underlying {@code SessionFactory}. If it isn't hibernate that is
 * used return {@code null}.
 *
 * @param emf an {@code EntityManagerFactory}
 * @return the {@code Statistics} from the underlying {@code SessionFactory} or {@code null}.
 */
private Statistics getStatistics(EntityManagerFactory emf) {
    try {
        SessionFactory sf = emf.unwrap(SessionFactory.class);
        return sf.getStatistics();
    } catch (PersistenceException pe) {
        return null;
    }
}