de.berlios.jedi.data.admin.HibernateAdminDataManager.java Source code

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Here is the source code for de.berlios.jedi.data.admin.HibernateAdminDataManager.java

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/*
 * Copyright 2005-2006 Daniel Calvio Snchez
 * 
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY.
 *
 * See the COPYING file for more details.
 */

package de.berlios.jedi.data.admin;

import org.apache.commons.logging.LogFactory;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

import de.berlios.jedi.common.entity.jisp.JispPackage;
import de.berlios.jedi.common.exception.DataException;
import de.berlios.jedi.data.HibernateDataManager;
import de.berlios.jedi.data.HibernateUtil;
import de.berlios.jedi.data.JispPackagesCache;

/**
 * <p>
 * Manages all the persistent admin data operations using Hibernate.<br>
 * It provides methods to save and delete JispPackages.
 * </p>
 * <p>
 * All the Hibernate related configuration is done in a declarative way using
 * the .xml files.
 * </p>
 * <p>
 * Due to the internal use of JispPackagesCache, it can not be used with various
 * JVM simultaneously.
 * </p>
 */
public class HibernateAdminDataManager implements AdminDataManager {

    /**
     * Saves a JispPackage.<br>
     * If the JispPackage was already stored, it will be updated. The
     * JispPackage is identified by its name and version (stored in its
     * JispMetadata object).
     * 
     * @param jispPackage
     *            The JispPackage to save.
     * @throws DataException
     *             If there was a problem when saving a JispPackage.
     */
    public void saveJispPackage(JispPackage jispPackage) throws DataException {
        try {
            Session session = HibernateUtil.currentSession();
            Transaction tx = session.beginTransaction();

            session.saveOrUpdate(jispPackage);

            tx.commit();
        } catch (HibernateException e) {
            LogFactory.getLog(HibernateDataManager.class)
                    .error("Hibernate threw an exception when" + " saving a JispPackage", e);
            throw new DataException("A problem occured when saving a JispPackage", e);
        } finally {
            HibernateUtil.closeSession();
        }
    }

    /**
     * Deletes a stored JispPackage from the persistent store.<br>
     * Also removes it from the JispPackagesCache.
     * 
     * @param jispPackage
     *            The JispPackage to delete.
     * @throws DataException
     *             If there was a problem when deleting a stored JispPackage.
     */
    public void deleteJispPackage(JispPackage jispPackage) throws DataException {
        try {
            Session session = HibernateUtil.currentSession();
            Transaction tx = session.beginTransaction();

            session.delete(jispPackage);

            JispPackagesCache.getJispPackagesCache().removeCachedJispPackage(jispPackage);

            tx.commit();
        } catch (HibernateException e) {
            LogFactory.getLog(HibernateDataManager.class)
                    .error("Hibernate threw an exception when" + " deleting a stored JispPackage", e);
            throw new DataException("A problem occured when deleting a stored JispPackage", e);
        } finally {
            HibernateUtil.closeSession();
        }
    }
}