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();
		}
	}
}