d05635716f9a001b157984413e4af818

来自「用jsf实现cd商店的程序」· 代码 · 共 108 行

package com.tangjun.data.hibernate;

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

public class HibernateSessionFactory
{

	private static String						CONFIG_FILE_LOCATION	= "/hibernate.cfg.xml";

	private static final ThreadLocal<Session>	threadLocal				= new ThreadLocal<Session>();

	private static Configuration				configuration			= new Configuration();

	private static org.hibernate.SessionFactory	sessionFactory;

	private static String						configFile				= CONFIG_FILE_LOCATION;

	private HibernateSessionFactory()
	{
	}

	/**
	 * Returns the ThreadLocal Session instance. Lazy initialize the <code>SessionFactory</code>
	 * if needed.
	 * @return Session
	 * @throws HibernateException
	 */
	public static Session getSession() throws HibernateException
	{
		Session session = (Session)threadLocal.get();

		if(session == null || !session.isOpen())
		{
			if(sessionFactory == null)
			{
				rebuildSessionFactory();
			}
			session = (sessionFactory != null) ? sessionFactory.openSession() : null;
			threadLocal.set(session);
		}

		return session;
	}

	/**
	 * Rebuild hibernate session factory
	 */
	public static void rebuildSessionFactory()
	{
		try
		{
			configuration.configure(configFile);
			sessionFactory = configuration.buildSessionFactory();
		}
		catch(Exception e)
		{
			System.err.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
	}

	/**
	 * Close the single hibernate session instance.
	 * @throws HibernateException
	 */
	public static void closeSession() throws HibernateException
	{
		Session session = (Session)threadLocal.get();
		threadLocal.set(null);

		if(session != null)
		{
			session.close();
		}
	}

	/**
	 * return session factory
	 */
	public static org.hibernate.SessionFactory getSessionFactory()
	{
		if(sessionFactory == null)
		{
			rebuildSessionFactory();
		}
		return sessionFactory;
	}

	/**
	 * return session factory session factory will be rebuilded in the next call
	 */
	public static void setConfigFile(String configFile)
	{
		HibernateSessionFactory.configFile = configFile;
		sessionFactory = null;
	}

	/**
	 * return hibernate configuration
	 */
	public static Configuration getConfiguration()
	{
		return configuration;
	}

}