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package com.sun.appserv.web.taglibs.cache;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import com.sun.appserv.util.cache.Cache;
import com.sun.appserv.web.cache.CacheManager;
/**
* CacheContextListener implements the ServletContextListener interface
* in order to be notified when the context is created and destroyed.
* It is used to create the cache and add it as a context attribute.
*/
public class CacheContextListener implements ServletContextListener
{
/**
* Public constructor taking no arguments according to servlet spec
*/
public CacheContextListener() {}
/**
* This is called when the context is created.
*/
public void contextInitialized(ServletContextEvent sce) {
ServletContext context = sce.getServletContext();
// see if a cache manager is already created and set in the context
CacheManager cm = (CacheManager)context.getAttribute(CacheManager.CACHE_MANAGER_ATTR_NAME);
// create a new cachemanager if one is not present and use it
// to create a new cache
if (cm == null)
cm = new CacheManager();
Cache cache = null;
try {
cache = cm.createCache();
} catch (Exception ex) {}
// set the cache as a context attribute
if (cache != null)
context.setAttribute(Constants.JSPTAG_CACHE_KEY, cache);
}
/**
* This is called when the context is shutdown.
*/
public void contextDestroyed(ServletContextEvent sce) {
ServletContext context = sce.getServletContext();
// Remove the cache from context and clear the cache
Cache cache = (Cache)context.getAttribute(Constants.JSPTAG_CACHE_KEY);
if (cache != null) {
context.removeAttribute(Constants.JSPTAG_CACHE_KEY);
cache.clear();
}
}
}