hibernateconfig.java

开源的OpenId的一个java实现

/*
 * Copyright 2005,2006 WSO2, Inc. http://www.wso2.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.wso2.solutions.identity.persistence;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.wso2.solutions.identity.IdentityProviderException;

/**
 * This loads the hibernate configuration and manages hibernate sessions.
 */
public class HibernateConfig {

    private static Log log = LogFactory.getLog(HibernateConfig.class);

    private SessionFactory sessionFactory;

    public final ThreadLocal SESSION = new ThreadLocal();

    public HibernateConfig(String fileName) throws IdentityProviderException {

        try {
            sessionFactory = new Configuration().configure(fileName)
                    .buildSessionFactory();

        } catch (Throwable e) {
            if (log.isDebugEnabled()) {
                log.debug("Initial SessionFactory creation failed.", e);
            }
            throw new IdentityProviderException("sessionFactoryCreationFailed",
                    e);
        }
    }

    /**
     * Accessor to obtain the session of the current thread.
     * 
     * @return Returns an <code>org.hibernate.Session</code> instace which is
     *         the hibernate session pertaining to this thread.
     */
    public Session getCurrentSession() {

        Session session = (Session) SESSION.get();
        if (session == null) {
            session = sessionFactory.openSession();
            SESSION.set(session);
        }
        return session;

    }

    /**
     * Closes the hibernate session of the current thread.
     */
    public void closeSession() {
        Session session = (Session) SESSION.get();
        if (session != null) {
            session.close();
        }
        SESSION.set(null);
    }

}