com.mss.mirage.util.HibernateServiceLocator.java Source code

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Here is the source code for com.mss.mirage.util.HibernateServiceLocator.java

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/*******************************************************************************
 *
 * Project : Mirage V2
 *
 * Package :
 *
 * Date    :  September 19, 2007, 8:27 PM
 *
 * Author  :  RangaRao Panda<rpanda@miraclesoft.com>
 *            Rajasekhar Yenduva<ryenduva@miraclesoft.com>
 *
 * File    : HibernateServiceLocator.java
 *
 * Copyright 2007 Miracle Software Systems, Inc. All rights reserved.
 * MIRACLE SOFTWARE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 * *****************************************************************************
 */

package com.mss.mirage.util;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

/**
 *
 * @author Rajasekhar Yenduva<ryenduva@miraclesoft.com>
 * @author RangaRao Panda<rpanda@miraclesoft.com>
 *
 * This Class.... ENTER THE DESCRIPTION HERE
 */
public class HibernateServiceLocator {

    // Instance for this class
    private static HibernateServiceLocator _instance;

    // java.sql.Connection object
    private Connection connection;

    // Hibernate Session Varible
    private Session session;

    // Hibernate SessionFactory Varible
    private SessionFactory sessionFactory;

    // ThreadLocal variable with early Instantiation
    private ThreadLocal sessionThreadLocal = new ThreadLocal();

    /** Creates a new instance of HibernateServiceLocator */
    private HibernateServiceLocator() throws ServiceLocatorException {

    }

    /**
     * @return An instance of the HibernateServiceLocator class
     * @throws ServiceLocatorException
     */
    public static HibernateServiceLocator getInstance() throws ServiceLocatorException {
        try {
            if (_instance == null) {
                _instance = new HibernateServiceLocator();
            }
        } catch (Exception ex) {
            throw new ServiceLocatorException(ex);
        }
        return _instance;
    }

    /*
     * This method is used to store the session in thread
     * @return Hibernate Session instance
     */

    public Session getSession() throws ServiceLocatorException {
        try {
            if (CacheManager.getCache().containsKey(ApplicationConstants.HIBERNATE_SESSION_FACTORY_KEY)) {
                sessionFactory = (SessionFactory) CacheManager.getCache()
                        .get(ApplicationConstants.HIBERNATE_SESSION_FACTORY_KEY);
            } else {
                sessionFactory = new Configuration().configure().buildSessionFactory();
                CacheManager.getCache().put(ApplicationConstants.HIBERNATE_SESSION_FACTORY_KEY, sessionFactory);
            }
            session = sessionFactory.openSession();
        } catch (HibernateException ex) {
            throw new ServiceLocatorException(ErrorMessages.CANNOT_GET_SESSIONFACTORY + ex.getMessage(), ex);
        }
        return session;
    }

}