Java tutorial
/* * $Header: /home/cvs/jakarta-tomcat-catalina/webapps/admin/WEB-INF/classes/org/apache/webapp/admin/ApplicationServlet.java,v 1.4 2003/07/08 06:32:52 remm Exp $ * $Revision: 1.4 $ * $Date: 2003/07/08 06:32:52 $ * * ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 2001 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Jakarta Project", "Struts", and "Apache Software * Foundation" must not be used to endorse or promote products derived * from this software without prior written permission. For written * permission, please contact apache@apache.org. * * 5. Products derived from this software may not be called "Apache" * nor may "Apache" appear in their names without prior written * permission of the Apache Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.webapp.admin; import java.text.DateFormat; import java.util.HashSet; import java.util.Locale; import java.util.ResourceBundle; import javax.management.MBeanServer; import javax.servlet.ServletException; import javax.servlet.UnavailableException; import org.apache.commons.modeler.Registry; import org.apache.struts.action.ActionServlet; import org.apache.struts.util.MessageResources; /** * Subclass of ActionServlet that adds caching of the supported locales in the * ApplicationLocales class. * * @author Patrick Luby * @version $Revision: 1.4 $ $Date: 2003/07/08 06:32:52 $ */ public class ApplicationServlet extends ActionServlet { // ----------------------------------------------------- Manifest Constants /** * The application scope key under which we store our * <code>ApplicationLocales</code> instance. */ public static final String LOCALES_KEY = "applicationLocales"; // ----------------------------------------------------- Instance Variables /** * The managed beans Registry used to look up metadata. */ protected Registry registry = null; /** * The JMX MBeanServer we will use to look up management beans. */ protected MBeanServer server = null; // --------------------------------------------------------- Public Methods /** * Convenience method to make the managed beans Registry available. * * @exception ServletException if the Registry is not available */ public Registry getRegistry() throws ServletException { if (registry == null) initRegistry(); return (this.registry); } /** * Convenience method to make the JMX MBeanServer available. * * @exception ServletException if the MBeanServer is not available */ public MBeanServer getServer() throws ServletException { if (server == null) initServer(); return (this.server); } /** * Initialize this servlet. * * @exception ServletException if an initialization error occurs. */ public void init() throws javax.servlet.ServletException { super.init(); initApplicationLocales(); } // ---------------------------------------------------- Protected Methods /** * Create and initialize the ApplicationLocales object, and make it * available as a servlet context attribute. */ protected void initApplicationLocales() { ApplicationLocales locales = new ApplicationLocales(this); getServletContext().setAttribute(LOCALES_KEY, locales); } /** * Validate the existence of the Registry that should have been * provided to us by an instance of * <code>org.apache.catalina.mbean.ServerLifecycleListener</code> * enabled at startup time. * * @exception ServletException if we cannot find the Registry */ protected void initRegistry() throws ServletException { registry = Registry.getRegistry(); //(Registry) getServletContext().getAttribute // ("org.apache.catalina.Registry"); if (registry == null) throw new UnavailableException("Registry is not available"); } /** * Validate the existence of the MBeanServer that should have been * provided to us by an instance of * <code>org.apache.catalina.mbean.ServerLifecycleListener</code> * enabled at startup time. * * @exception ServletException if we cannot find the MBeanServer */ protected void initServer() throws ServletException { server = Registry.getRegistry().getMBeanServer(); //(MBeanServer) getServletContext().getAttribute // ("org.apache.catalina.MBeanServer"); if (server == null) throw new UnavailableException("MBeanServer is not available"); } }