com.itk.chaabouni.dao.SessionService.java Source code

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Here is the source code for com.itk.chaabouni.dao.SessionService.java

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package com.itk.chaabouni.dao;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

/**
 * Singelton design pattern, lazy initialization with double checked-lock
 * https://en.wikipedia.org/wiki/Singleton_pattern
 * @author mchaabouni
 */
public class SessionService {
    private static SessionFactory sessionFactory = null;

    private SessionService() {

    }

    public static SessionFactory getSessionFactory() {
        if (sessionFactory == null) {
            synchronized (SessionService.class) {
                if (sessionFactory == null) {
                    Configuration configuration = new Configuration();
                    configuration.configure();
                    ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                            .applySettings(configuration.getProperties()).build();
                    sessionFactory = configuration.buildSessionFactory(serviceRegistry);
                }
            }
        }
        return sessionFactory;
    }
}