net.databinder.DataRequestCycle Maven / Gradle / Ivy
/*
* Databinder: a simple bridge from Wicket to Hibernate
* Copyright (C) 2006 Nathan Hamblen [email protected]
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Note: this class contains code adapted from wicket-contrib-database.
*/
package net.databinder;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import wicket.Application;
import wicket.Response;
import wicket.protocol.http.WebRequest;
import wicket.protocol.http.WebRequestCycle;
import wicket.protocol.http.WebSession;
/**
* Opens Hibernate sessions as required and closes (but does not flush) them at a request's
* end. Creates a Hibernate session factory in a static initialization block, configuring it with
* annotatied classes in a DataApplication subclass.
* @author Nathan Hamblen
*/
public class DataRequestCycle extends WebRequestCycle {
private Session hibernateSession;
private static final SessionFactory hibernateSessionFactory;
static {
try {
AnnotationConfiguration config = new AnnotationConfiguration();
DataApplication app = ((DataApplication)Application.get());
app.configureHibernate(config);
hibernateSessionFactory = config.buildSessionFactory();
} catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public DataRequestCycle(final WebSession session, final WebRequest request, final Response response) {
super(session, request, response);
}
/**
* Will open a session if one is not already open for this request.
* @return the open Hibernate session for the current request cycle.
*/
public static Session getHibernateSession() {
return ((DataRequestCycle)get()).getCycleHibernateSession();
}
/**
* Opens a session and a transaction if a session is not already associated with
* this request cycle.
* @return the open Hibernate session for this request cycle.
*/
protected Session getCycleHibernateSession() {
if(hibernateSession == null) {
hibernateSession = openSession();
hibernateSession.beginTransaction();
}
return hibernateSession;
}
/**
* @return a newly opened session
*/
private static Session openSession()
throws HibernateException {
return hibernateSessionFactory.openSession();
}
/**
* Closes the Hibernate session, if one was open for this request. Hibernate will
* try to rollback any uncommited transactions.
* @see net.databinder.components.DataForm#onSubmit()
*/
@Override
protected void onEndRequest() {
try {
if (hibernateSession != null)
hibernateSession.close();
} finally {
hibernateSession = null;
}
}
}