Java tutorial
package org.red5.server.war; /* * RED5 Open Source Flash Server - http://www.osflash.org/red5 * * Copyright (c) 2006-2007 by respective authors (see below). All rights reserved. * * This library is free software; you can redistribute it and/or modify it under the * terms of the GNU Lesser General Public License as published by the Free Software * Foundation; either version 2.1 of the License, or (at your option) any later * version. * * This library is distributed in the hope that it will be useful, but WITHOUT ANY * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License along * with this library; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ import java.beans.Introspector; import java.io.File; import java.io.FileInputStream; import java.sql.Driver; import java.sql.DriverManager; import java.util.Enumeration; import java.util.Properties; import javax.servlet.ServletContext; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.http.HttpServlet; import org.apache.commons.lang.StringUtils; import org.red5.server.jmx.JMXAgent; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.config.ConfigurableBeanFactory; import org.springframework.web.context.ConfigurableWebApplicationContext; import org.springframework.web.context.ContextLoader; import org.springframework.web.context.WebApplicationContext; /** * Entry point from which the server config file is loaded while running within * a J2EE application container. * * This listener should be registered after Log4jConfigListener in web.xml, if * the latter is used. * * @author The Red5 Project (red5@osflash.org) * @author Paul Gregoire (mondain@gmail.com) */ public class MainServlet extends HttpServlet implements ServletContextListener { private final static long serialVersionUID = 41919712006L; // Initialize Logging public static Logger logger = LoggerFactory.getLogger(MainServlet.class); protected static String red5Config = "/WEB-INF/applicationContext.xml"; private static ServletContext servletContext; /** * Main entry point for the Red5 Server as a war */ // Notification that the web application is ready to process requests public void contextInitialized(ServletContextEvent sce) { System.setProperty("red5.deployment.type", "war"); if (null != servletContext) { return; } servletContext = sce.getServletContext(); String prefix = servletContext.getRealPath("/"); long time = System.currentTimeMillis(); logger.info("RED5 Server (http://www.osflash.org/red5)"); logger.info("Loading red5 global context from: " + red5Config); logger.info("Path: " + prefix); try { // Detect root of Red5 configuration and set as system property String root; String classpath = System.getProperty("java.class.path"); File fp = new File(prefix + red5Config); fp = fp.getCanonicalFile(); if (!fp.isFile()) { // Given file does not exist, search it on the classpath String[] paths = classpath.split(System.getProperty("path.separator")); for (String element : paths) { fp = new File(element + "/" + red5Config); fp = fp.getCanonicalFile(); if (fp.isFile()) { break; } } } if (!fp.isFile()) { throw new Exception( "could not find configuration file " + red5Config + " on your classpath " + classpath); } root = fp.getAbsolutePath(); root = root.replace('\\', '/'); int idx = root.lastIndexOf('/'); root = root.substring(0, idx); // update classpath System.setProperty("java.class.path", classpath + File.pathSeparatorChar + root + File.pathSeparatorChar + root + "/classes"); logger.debug("New classpath: " + System.getProperty("java.class.path")); // set configuration root System.setProperty("red5.config_root", root); logger.info("Setting configuation root to " + root); // Setup system properties so they can be evaluated Properties props = new Properties(); props.load(new FileInputStream(root + "/red5.properties")); for (Object o : props.keySet()) { String key = (String) o; if (StringUtils.isNotBlank(key)) { System.setProperty(key, props.getProperty(key)); } } // Store root directory of Red5 idx = root.lastIndexOf('/'); root = root.substring(0, idx); if (System.getProperty("file.separator").equals("/")) { // Workaround for linux systems root = "/" + root; } System.setProperty("red5.root", root); logger.info("Setting Red5 root to " + root); Class contextClass = org.springframework.web.context.support.XmlWebApplicationContext.class; ConfigurableWebApplicationContext applicationContext = (ConfigurableWebApplicationContext) BeanUtils .instantiateClass(contextClass); String[] strArray = servletContext.getInitParameter(ContextLoader.CONFIG_LOCATION_PARAM) .split("[,\\s]"); logger.info("Config location files: " + strArray.length); applicationContext.setConfigLocations(strArray); applicationContext.setServletContext(servletContext); applicationContext.refresh(); // set web application context as an attribute of the servlet // context so that it may be located via Springs // WebApplicationContextUtils servletContext.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, applicationContext); ConfigurableBeanFactory factory = applicationContext.getBeanFactory(); // register default // add the context to the parent factory.registerSingleton("default.context", applicationContext); } catch (Throwable e) { logger.error("", e); } long startupIn = System.currentTimeMillis() - time; logger.info("Startup done in: " + startupIn + " ms"); } /** * Clearing the in-memory configuration parameters, we will receive * notification that the servlet context is about to be shut down */ public void contextDestroyed(ServletContextEvent sce) { logger.info("Webapp shutdown"); // XXX Paul: grabbed this from // http://opensource.atlassian.com/confluence/spring/display/DISC/Memory+leak+-+classloader+won%27t+let+go // in hopes that we can clear all the issues with J2EE containers during // shutdown try { // prepare spring for shutdown Introspector.flushCaches(); // dereg any drivers for (Enumeration e = DriverManager.getDrivers(); e.hasMoreElements();) { Driver driver = (Driver) e.nextElement(); if (driver.getClass().getClassLoader() == getClass().getClassLoader()) { DriverManager.deregisterDriver(driver); } } // shutdown jmx JMXAgent.shutdown(); // shutdown spring // get web application context from the servlet context ConfigurableWebApplicationContext applicationContext = (ConfigurableWebApplicationContext) servletContext .getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); ConfigurableBeanFactory factory = applicationContext.getBeanFactory(); if (factory.containsSingleton("default.context")) { for (String scope : factory.getRegisteredScopeNames()) { logger.debug("Registered scope: " + scope); } for (String singleton : factory.getSingletonNames()) { logger.debug("Registered singleton: " + singleton); // factory.destroyScopedBean(singleton); } factory.destroySingletons(); } servletContext.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); applicationContext.close(); // http://jakarta.apache.org/commons/logging/guide.html#Classloader_and_Memory_Management // http://wiki.apache.org/jakarta-commons/Logging/UndeployMemoryLeak?action=print // LogFactory.release(Thread.currentThread().getContextClassLoader()); } catch (Throwable e) { // may get a java.lang.StackOverflowError when shutting appcontext // down in jboss e.printStackTrace(); } } }