Could we use a static variable to solve the problem?
----- Original Message -----
From: "Rick Reumann" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <user@struts.apache.org>
Sent: Tuesday, July 26, 2005 6:06 PM
Subject: probably a cleaner way... testing for just one user
I have an odd requirement where this internal application should only be
used by one valid user(one session) at a time. (The data being worked with
in the application would require so many locks that's it just easier to
restrict it to one user). Currently I'm achieving this in the following
manner and wondering if there is a better way to do it...
1) A SessionListener ...
in sesionCreated(..)...
HttpSession session = event.getSession();
ServletContext context = session.getServletContext();
synchronized( context ) {
if ( context.getAttribute(Constants.APPLICATION_IN_USE) == null ) {
//mark it now in use for application scope for any new sessions to see
it's in use
context.setAttribute(Constants.APPLICATION_IN_USE, Boolean.TRUE );
//but mark in not in use for this session
session.setAttribute(Constants.APPLICATION_IN_USE, Boolean.FALSE);
} else {
//is in use so mark it in use so Session in filter can see it's being
used already
session.setAttribute(Constants.APPLICATION_IN_USE, Boolean.TRUE);
}
}
sessionDestroyed clears out context APPPLICATION_IN_USE flag.
2) In my servlet filter that filters all requests...
if ( path.indexOf("/appinuse.jsp") == -1 ) {
if ( session.getAttribute(Constants.APPLICATION_IN_USE) != null &&
((Boolean)session.getAttribute(Constants.APPLICATION_IN_USE)).booleanValue()
) {
log.debug("Application already in use!!!");
response.sendRedirect(contextPath+"/appinuse.jsp");
return;
}
}
Does the above seem to be an ok way to handle this? It's working but not
sure if there is a cleaner way?
--
Rick
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