Below is a filter which keeps track of how many sessions are attached to a
web app. The key part is the HttpSessionBindingListener interface.
Tim
/**
* J2EE "Filter" to count page hits. What it counts depends on the
url-mapping
* in web.xml.
*
* @author tim.lucia
*/
public class SessionCountFilter
implements Filter, HttpSessionBindingListener, Serializable
{
private final static Log logger =
LogFactory.getLog(SessionCountFilter.class);
public static final Hashtable sessions = new Hashtable();
public static int sessionCountHighWater = 0;
/**
* Container startup notification
*/
public void init(FilterConfig arg0) throws ServletException
{
logger.debug("init(): " + arg0);
}
/**
* Container shutdown notification
*/
public void destroy()
{
logger.debug("destroy()");
}
/**
* Process the container's filter request.
* @param request - Request object
* @param response - response object
* @param chain - next filter in the chain.
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException
{
chain.doFilter(request, response);
HttpServletRequest httpRequest = (HttpServletRequest)request;
HttpSession session = httpRequest.getSession(false);
if (logger.isDebugEnabled()) {
logger.debug("Request " + httpRequest.getRequestURI() +
(session == null ? " returned no session" :
" belongs to session ID " + session.getId()));
}
// Bind to the session, if there is one, and it is new:
if (null != session && session.isNew()) {
session.setAttribute(toString(), this);
}
}
/**
* Implement HttpSessionBindingListener#valueBound
*/
public void valueBound(HttpSessionBindingEvent bindEvent)
{
HttpSession session = bindEvent.getSession();
final String sessionID = session.getId();
sessions.put(session, sessionID);
if (logger.isDebugEnabled()) {
logger.debug("[" + sessions.size() + "] CREATE: " + sessionID);
}
sessionCountHighWater =
(sessionCountHighWater < sessions.size() ? sessions.size() :
sessionCountHighWater);
}
/**
* Implement HttpSessionBindingListener#valueUnbound
*/
public void valueUnbound(HttpSessionBindingEvent bindEvent)
{
HttpSession session = bindEvent.getSession();
final String sessionID = (String)sessions.get(session);
sessions.remove(session);
if (logger.isDebugEnabled()) {
logger.debug("[" + sessions.size() + "] DESTROY: " + sessionID);
}
}
/**
* Return current count of sessions
* @return The number of sessions currently tracked
*/
public static int getSessionCount()
{
return sessions.size();
}
/**
* Return high water mark of number of sessions
* @return The high water mark of sessions tracked
*/
public static int getSessionCountHighWater()
{
return sessionCountHighWater;
}
/**
* Return string representation of this object
* @return a String representation of this object
*/
public String toString()
{
return getClass().getName() + "#" + hashCode();
}
}
-----Original Message-----
From: David Kerber [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 09, 2006 9:38 AM
To: Tomcat Users List
Subject: Logging session timeouts
Is there any way of trapping session timeouts, so I can log them? I am
logging when a user logs in and when they explicitly log out, but would like
to log when their session times out, if that is possible.
TIA!
Dave
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