compecon.engine.util.HibernateUtil.java Source code

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Here is the source code for compecon.engine.util.HibernateUtil.java

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/*
Copyright (C) 2013 u.wol@wwu.de 
     
This file is part of ComputationalEconomy.
    
ComputationalEconomy is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
ComputationalEconomy 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 General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with ComputationalEconomy. If not, see <http://www.gnu.org/licenses/>.
 */

package compecon.engine.util;

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

public class HibernateUtil {

    private static Boolean isActive;

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static Session session;

    public static boolean isActive() {
        if (isActive == null) {
            final String dbActive = System.getProperty("dbActive");
            if (dbActive != null) {
                isActive = Boolean.parseBoolean(dbActive);
            } else {
                isActive = false;
            }
        }

        return isActive;
    }

    private static SessionFactory buildSessionFactory() {
        if (HibernateUtil.isActive()) {
            Configuration configuration = new Configuration();
            configuration.configure("hibernate.cfg.xml");
            ServiceRegistryBuilder serviceRegistryBuilder = new ServiceRegistryBuilder()
                    .applySettings(configuration.getProperties());
            SessionFactory sessionFactory = configuration
                    .buildSessionFactory(serviceRegistryBuilder.buildServiceRegistry());
            return sessionFactory;
        }
        return null;
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    /*
     * Non-transactional session
     */
    public static void openSession() {
        if (HibernateUtil.isActive()) {
            // open session independent from transaction contexts
            session = sessionFactory.openSession();
        }
    }

    public static void clearSession() {
        if (HibernateUtil.isActive()) {
            session.clear();
        }
    }

    public static void closeSession() {
        if (HibernateUtil.isActive()) {
            // close session independent from transaction contexts
            session.close();
        }
    }

    public static Session getSession() {
        return session;
    }

    public static void flushSession() {
        if (HibernateUtil.isActive()) {
            session.flush();
        }
    }

    /*
     * CurrentSession -> transactional
     */
    public static Session getCurrentSession() {
        if (HibernateUtil.isActive())
            return sessionFactory.getCurrentSession();
        return null;
    }

    public static void closeCurrentSession() {
        if (HibernateUtil.isActive()) {
            HibernateUtil.getCurrentSession().close();
        }
    }

    public static void flushCurrentSession() {
        if (HibernateUtil.isActive()) {
            HibernateUtil.getCurrentSession().flush();
        }
    }

    public static Session beginTransaction() {
        if (HibernateUtil.isActive()) {
            Session hibernateSession = HibernateUtil.getCurrentSession();
            hibernateSession.beginTransaction();
            return hibernateSession;
        }
        return null;
    }

    public static void commitTransaction() {
        if (HibernateUtil.isActive()) {
            HibernateUtil.getCurrentSession().getTransaction().commit();
        }
    }

    public static void rollbackTransaction() {
        if (HibernateUtil.isActive()) {
            HibernateUtil.getCurrentSession().getTransaction().rollback();
        }
    }
}