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SessionFactoryUtil.java
import javax.naming.InitialContext;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
public class SessionFactoryUtil
{
private SessionFactoryUtil()
{
}
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
/**
* The single instance of hibernate configuration
*/
private static final Configuration cfg = new Configuration();
/**
* The single instance of hibernate SessionFactory
*/
private static org.hibernate.SessionFactory sessionFactory;
/**
* initialises the configuration if not yet done and returns the current
* instance
* @return
*/
public static SessionFactory getInstance()
{
if (sessionFactory == null) initSessionFactory();
return sessionFactory;
}
/**
* Returns the ThreadLocal Session instance. Lazy initialize the
* <code>SessionFactory</code> if needed. @return Session @throws
* HibernateException
*/
public Session openSession()
{
return sessionFactory.getCurrentSession();
}
/**
* The behaviour of this method depends on the session context you have
* configured. This factory is intended to be used with a hibernate.cfg.xml
* including the following property <property name="current_session_context_class">thread</property>
* This would return the current open session or if this does not exist,
* will create a new session
* @return
*/
public Session getCurrentSession()
{
return sessionFactory.getCurrentSession();
}
/**
* initializes the sessionfactory in a safe way even if more than one thread
* tries to build a sessionFactory
*/
private static synchronized void initSessionFactory()
{
if (sessionFactory == null)
{
try
{
cfg.configure(CONFIG_FILE_LOCATION);
String sessionFactoryJndiName =
cfg.getProperty(Environment.SESSION_FACTORY_NAME);
if (sessionFactoryJndiName != null)
{
cfg.buildSessionFactory();
sessionFactory = (SessionFactory)(new InitialContext()).lookup(sessionFactoryJndiName);
}
else
{
sessionFactory = cfg.buildSessionFactory();
}
}
catch(Exception e)
{
throw new HibernateException("Could not initialize the Hibernate configuration", e);
}
catch(Throwable t){
throw new HibernateException("Could not initialize the Hibernate configuration", t);
}
}
}
public static void close()
{
if (sessionFactory != null) sessionFactory.close();
sessionFactory = null;
}
}
Narendra Kumar Dantala
A J2EE Developer
Having a masters degree in Computational Science, working in Java, developed applications on different domains such as Finanical Services, B2B, Banking, Utility...