Add the following fragment to your web.xml:
<!-- Session Counting Filter -->
<!-- Every request passing through this filter will be checked for a -->
<!-- newly-created session, which will be then counted against the -->
<!-- total sessions using this application. -->
<filter>
<filter-name>SessionCountFilter</filter-name>
<filter-class>SessionCountFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SessionCountFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
-----Original Message-----
From: David Kerber [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 09, 2006 10:56 AM
To: Tomcat Users List
Subject: Re: Logging session timeouts
I got your code in, and it compiles, but I don't understand how I configure
the url-mapping you refer to. Could you point me to some docs for that? I
looked through the web.xml files (both the server one, and the one for the
app), but couldn't find anything about url-mapping or filters that seemed to
apply to this. It may be there, but I don't know enough about it to
recognize it.
Thanks!
Dave
Tim Lucia wrote:
>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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