package auction.persistence.audit;import org.hibernate.*;import java.sql.Connection;import auction.persistence.HibernateUtil;import auction.model.Auditable;/** * The audit log helper that logs actual events. * <p> * The <tt>logEvent()</tt> method needs a JDBC connection, it will * open a new Hibernate <tt>Session</tt> on that connection and * persist the event. The temporary <tt>Session</tt> is then closed, * transaction handling is left to the client calling this method. * * @author Christian Bauer */public class AuditLog {	public static void logEvent(		String message,		Auditable entity,		Long userId,		Connection connection) {		Session tempSession =		  HibernateUtil.getSessionFactory()                  .openSession(connection, EmptyInterceptor.INSTANCE);		try {			AuditLogRecord record =				new AuditLogRecord(message,								   entity.getId(),								   entity.getClass(),								   userId );			tempSession.save(record);			tempSession.flush();		} finally {            tempSession.close();		}	}}