CacheContextListener


1   /*
2    * Copyright (c) 2002-2003 by OpenSymphony
3    * All rights reserved.
4    */
5   package com.opensymphony.oscache.web;
6   
7   import javax.servlet.ServletContext  ;
8   import javax.servlet.ServletContextEvent  ;
9   import javax.servlet.ServletContextListener  ;
10  
11  /**
12   * Class for a clean startup and shutdown of the ServletCacheAdministrator and its application scoped cache.
13   * @author <a HREF="&#109;a&#105;&#108;&#116;&#111;:chris&#64;swebtec.&#99;&#111;&#109;">Chris Miller</a>
14   */
15  public class CacheContextListener implements ServletContextListener   {
16  
17      /**
18       * This notification occurs when the webapp is ready to process requests.<p>
19       * We use this hook to cleanly start up the {@link ServletCacheAdministrator}
20       * and create the application scope cache (which will consequentially
21       * initialize any listeners configured for it that implement <code>LifecycleAware</code>.)<p>
22       *
23       * As of Servlet 2.4, this is guaranteed to be called before any Servlet.init()
24       * methods.
25       */
26      public void contextInitialized(ServletContextEvent   servletContextEvent) {
27          ServletContext   context = servletContextEvent.getServletContext();
28          ServletCacheAdministrator.getInstance(context);
29      }
30  
31      /**
32       * This notification occurs when the servlet context is about to be shut down.
33       * We use this hook to cleanly shut down the cache.
34       */
35      public void contextDestroyed(ServletContextEvent   servletContextEvent) {
36          ServletContext   context = servletContextEvent.getServletContext();
37          ServletCacheAdministrator.destroyInstance(context);
38      }
39  
40  }

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