Package org.red5.server.war

Source Code of org.red5.server.war.WarLoaderServlet

/*
* RED5 Open Source Flash Server - http://code.google.com/p/red5/
*
* Copyright 2006-2014 by respective authors (see below). All rights reserved.
*
* 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.red5.server.war;

import java.beans.Introspector;
import java.io.File;
import java.sql.Driver;
import java.sql.DriverManager;
import java.util.ArrayList;
import java.util.Enumeration;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;

import org.red5.io.amf.Output;
import org.red5.logging.Red5LoggerFactory;
import org.red5.server.ClientRegistry;
import org.red5.server.Context;
import org.red5.server.MappingStrategy;
import org.red5.server.Server;
import org.red5.server.api.Red5;
import org.red5.server.scope.GlobalScope;
import org.red5.server.scope.ScopeResolver;
import org.red5.server.scope.WebScope;
import org.red5.server.service.ServiceInvoker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.web.context.ConfigurableWebApplicationContext;
import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;

import ch.qos.logback.classic.LoggerContext;

/**
* 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
* @author Paul Gregoire (mondain@gmail.com)
*/
public class WarLoaderServlet extends ContextLoaderListener {

  // Initialize Logging
  public static Logger logger = Red5LoggerFactory.getLogger(WarLoaderServlet.class);

  private static ArrayList<ServletContext> registeredContexts = new ArrayList<ServletContext>(3);

  private ConfigurableWebApplicationContext applicationContext;

  private DefaultListableBeanFactory parentFactory;

  private static ServletContext servletContext;

  private ClientRegistry clientRegistry;

  private ServiceInvoker globalInvoker;

  private MappingStrategy globalStrategy;

  private ScopeResolver globalResolver;

  private GlobalScope global;

  private Server server;

  /**
   * Main entry point for the Red5 Server as a war
   */
  // Notification that the web application is ready to process requests
  @Override
  public void contextInitialized(ServletContextEvent sce) {
    if (null != servletContext) {
      return;
    }
    System.setProperty("red5.deployment.type", "war");

    servletContext = sce.getServletContext();
    String prefix = servletContext.getRealPath("/");

    if (System.getProperty("red5.webapp.root") == null) {
      File webapps = new File(prefix);
      System.setProperty("red5.webapp.root", webapps.getParent());
      webapps = null;
    }

    long time = System.currentTimeMillis();

    logger.info("{} WAR loader", Red5.VERSION);
    logger.debug("Path: {}", prefix);

    try {
      //use super to initialize
      super.contextInitialized(sce);
      //get the web context
      applicationContext = (ConfigurableWebApplicationContext) servletContext.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
      logger.debug("Root context path: {}", applicationContext.getServletContext().getContextPath());

      ConfigurableBeanFactory factory = applicationContext.getBeanFactory();

      // register default
      factory.registerSingleton("default.context", applicationContext);

      // get the main factory
      parentFactory = (DefaultListableBeanFactory) factory.getParentBeanFactory();

    } catch (Throwable t) {
      logger.error("", t);
    }

    long startupIn = System.currentTimeMillis() - time;
    logger.info("Startup done in: {} ms", startupIn);

  }

  /*
   * Registers a subcontext with red5
   */
  public void registerSubContext(String webAppKey) {
    // get the sub contexts - servlet context
    ServletContext ctx = servletContext.getContext(webAppKey);
    if (ctx == null) {
      ctx = servletContext;
    }
    ContextLoader loader = new ContextLoader();
    ConfigurableWebApplicationContext appCtx = (ConfigurableWebApplicationContext) loader.initWebApplicationContext(ctx);
    appCtx.setParent(applicationContext);
    appCtx.refresh();

    ctx.setAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE, appCtx);

    ConfigurableBeanFactory appFactory = appCtx.getBeanFactory();

    logger.debug("About to grab Webcontext bean for {}", webAppKey);
    Context webContext = (Context) appCtx.getBean("web.context");
    webContext.setCoreBeanFactory(parentFactory);
    webContext.setClientRegistry(clientRegistry);
    webContext.setServiceInvoker(globalInvoker);
    webContext.setScopeResolver(globalResolver);
    webContext.setMappingStrategy(globalStrategy);

    WebScope scope = (WebScope) appFactory.getBean("web.scope");
    scope.setServer(server);
    scope.setParent(global);
    scope.register();
    scope.start();

    // register the context so we dont try to reinitialize it
    registeredContexts.add(ctx);

  }

  /**
   * Clearing the in-memory configuration parameters, we will receive
   * notification that the servlet context is about to be shut down
   */
  @Override
  public void contextDestroyed(ServletContextEvent sce) {
    synchronized (servletContext) {
      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
      ServletContext ctx = null;
      try {
        ctx = sce.getServletContext();
        // 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);
          }
        }
        // clear the AMF output cache
        Output.destroyCache();
        // stop the logger
        try {
          ((LoggerContext) LoggerFactory.getILoggerFactory()).stop();
        } catch (Exception e) {
        }
        // shutdown spring
        Object attr = ctx.getAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
        if (attr != null) {
          // get web application context from the servlet context
          ConfigurableWebApplicationContext applicationContext = (ConfigurableWebApplicationContext) attr;
          ConfigurableBeanFactory factory = applicationContext.getBeanFactory();
          // for (String scope : factory.getRegisteredScopeNames()) {
          // logger.debug("Registered scope: " + scope);
          // }
          try {
            for (String singleton : factory.getSingletonNames()) {
              logger.debug("Registered singleton: {}", singleton);
              factory.destroyScopedBean(singleton);
            }
          } catch (RuntimeException e) {
          }
          factory.destroySingletons();
          applicationContext.close();
        }
      } catch (Throwable e) {
        logger.warn("Exception {}", e);
      } finally {
        super.contextDestroyed(sce);
        if (ctx != null) {
          ctx.removeAttribute(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
        }
      }
    }
  }

}
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