databasefilter.java

来自「开源项目CRM之OpenCustomer」· Java 代码 · 共 121 行

/*******************************************************************************
 * ***** BEGIN LICENSE BLOCK Version: MPL 1.1
 * 
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is the OpenCustomer CRM.
 * 
 * The Initial Developer of the Original Code is Thomas Bader (Bader & Jene
 * Software-Ingenieurb黵o). Portions created by the Initial Developer are
 * Copyright (C) 2005 the Initial Developer. All Rights Reserved.
 * 
 * Contributor(s): Thomas Bader <[e-mail]>
 * 
 * ***** END LICENSE BLOCK *****
 */

package org.opencustomer.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.opencustomer.db.Database;

/**
 * Filter which manages a ThreadLocal hibernate session. Obtain the session by
 * calling Persistance.getSession( ).
 */
public final class DatabaseFilter extends Database implements Filter
{
    private final static Logger log = Logger.getLogger(DatabaseFilter.class);

    public void init(FilterConfig filterConfig) throws ServletException
    {
        // Initialize hibernate
        try
        {
            if (log.isInfoEnabled())
                log.info("initialize hibernate");

            doInit();
        }
        catch (HibernateException e)
        {
            log.error("could not initialize hibernate", e);
            throw new ServletException(e);
        }
    }

    /**
     * 
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
    {
        if (hibernateHolder.get() != null)
        {
            System.err.println("A session is already associated with this thread! Someone must have called getSession( ) outside of the context of a servlet request.");
            // throw new IllegalStateException("A session is already associated
            // with this thread! Someone must have called getSession( ) outside
            // of the context of a servlet request.");
        }

        try
        {
            chain.doFilter(request, response);
        }
        catch (Exception e)
        {
            log.error("could not execute database filter", e);
        }
        finally
        {
            Session sess = hibernateHolder.get();
            if (sess != null)
            {
                hibernateHolder.set(null);

                try
                {
                    if (log.isDebugEnabled())
                        log.debug("close hibernate session");
                    sess.close();
                }
                catch (HibernateException e)
                {
                    log.error("could not close hibernate session", e);
                    throw new ServletException(e);
                }
            }
        }
    }

    /**
     * @return the hibernate session factory
     */
    public static SessionFactory getSessionFactory()
    {
        return factory;
    }

    public void destroy()
    {
        // Nothing necessary
    }
}