001    /**
002     * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.servlet;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.kernel.portlet.PortletClassLoaderUtil;
020    import com.liferay.portal.kernel.util.PortalClassLoaderUtil;
021    import com.liferay.portal.kernel.util.PortalInitable;
022    import com.liferay.portal.kernel.util.PortalInitableUtil;
023    
024    import javax.servlet.ServletContext;
025    import javax.servlet.ServletContextEvent;
026    import javax.servlet.ServletContextListener;
027    
028    /**
029     * @author Brian Wing Shun Chan
030     * @author Sandeep Soni
031     */
032    public abstract class PortalClassLoaderServletContextListener
033            implements PortalInitable, ServletContextListener {
034    
035            public PortalClassLoaderServletContextListener() {
036            }
037    
038            public void contextDestroyed(ServletContextEvent event) {
039                    PortletClassLoaderUtil.setClassLoader(_portletClassLoader);
040                    PortletClassLoaderUtil.setServletContextName(_servletContextName);
041    
042                    Thread currentThread = Thread.currentThread();
043    
044                    ClassLoader contextClassLoader = currentThread.getContextClassLoader();
045    
046                    try {
047                            currentThread.setContextClassLoader(
048                                    PortalClassLoaderUtil.getClassLoader());
049    
050                            _servletContextListener.contextDestroyed(event);
051                    }
052                    finally {
053                            currentThread.setContextClassLoader(contextClassLoader);
054                    }
055            }
056    
057            public void contextInitialized(ServletContextEvent event) {
058                    _event = event;
059    
060                    ServletContext servletContext = event.getServletContext();
061    
062                    _servletContextName = servletContext.getServletContextName();
063    
064                    Thread currentThread = Thread.currentThread();
065    
066                    _portletClassLoader = currentThread.getContextClassLoader();
067    
068                    PortalInitableUtil.init(this);
069            }
070    
071            public void portalInit() {
072                    PortletClassLoaderUtil.setClassLoader(_portletClassLoader);
073                    PortletClassLoaderUtil.setServletContextName(_servletContextName);
074    
075                    Thread currentThread = Thread.currentThread();
076    
077                    ClassLoader contextClassLoader = currentThread.getContextClassLoader();
078    
079                    try {
080                            currentThread.setContextClassLoader(
081                                    PortalClassLoaderUtil.getClassLoader());
082    
083                            _servletContextListener = getInstance();
084    
085                            _servletContextListener.contextInitialized(_event);
086                    }
087                    catch (Exception e) {
088                            _log.error(e, e);
089                    }
090                    finally {
091                            currentThread.setContextClassLoader(contextClassLoader);
092                    }
093            }
094    
095            protected abstract ServletContextListener getInstance() throws Exception;
096    
097            private static Log _log = LogFactoryUtil.getLog(
098                    PortalClassLoaderServletContextListener.class);
099    
100            private ServletContextEvent _event;
101            private ServletContextListener _servletContextListener;
102            private ClassLoader _portletClassLoader;
103            private String _servletContextName;
104    
105    }