hbsessionfactory.java

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package org.whatisjava.dang.dao.hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HbSessionFactory {
	private static Configuration conf;

	private static SessionFactory factory;

	private static ThreadLocal<Session> tl = new ThreadLocal<Session>();

	public synchronized static Session getSession() {
		Session session = tl.get();
		if (session == null) {
			if (factory == null) {
				if (conf == null) {
					conf = new Configuration();
					conf.configure();
				}
				factory = conf.buildSessionFactory();
			}
			session = factory.openSession();
			tl.set(session);
		}
		return session;
	}

	public static void closeSession() {
		Session session = tl.get();
		if (session != null) {
			session.close();
			tl.set(null);
		}
	}
}