client.lastvisit does the same thing and is handled by CF. Anthony Petruzzi Webmaster 954-321-4703 [EMAIL PROTECTED] http://www.sheriff.org
-----Original Message----- From: Kevin Langevin [mailto:[EMAIL PROTECTED]] Sent: Tuesday, April 23, 2002 5:12 AM To: CF-Talk Subject: Keeping track of logged-in users... Hi all- Got a "best practices" question for you. I've got a client site which uses client variables to track users' sessions for auto-logout. When a user logs on, a CLIENT.lastAccess variable is set to now(). In the application.cfm, a check is run to see if CLIENT.lastAccess is defined and if it's more recent than 20 minutes. If it is, then CLIENT.lastAccess is set to now() again, and processing continues. As long as the client hits a page before the 20 minute time limit runs out, works great. To log the user out, I delete certain client variables, especially lastAccess. Now my dimlemma. The client decided that he wants to track how many users are "logged on" (how many have accessed a page in the last 20 minutes and haven't yet been logged off. The only way I can see to do this is to ALSO write now() into a lastAccess field in the member database on each hit right after writing the client variable, so that the home page, which is supposed to display the number of users logged in, can run a query on members with a lastAccess field with a time less than 20 minutes ago. This just seems like a lot of DB access (one write when setting the CLIENT variable, and another when updating the member table), but I'm wondering if anyone has experience doing something like this, and whether that one extra update on each page hit will hurt that much. Assume a few thousand members hitting the site daily, spread out, most likely, but probably surfing around a fair bit (lots of articles, and a message board). Doing the CLIENT variable update seems to impact the site not at all, but I've not tested under really heavy load. Does anyone have a more elegant way of doing this, like parsing the Client DB for the CLIENT.lastAccess variable and getting a count of the ones with a value less than 20 minutes ago. Any suggestions would be most appreciated. Thanks... Kevin Langevin Flying Chimp Media 954-585-0999 [EMAIL PROTECTED] http://www.FlyingChimp.com > -----Original Message----- > From: Neil Clark - =TMM= [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, April 23, 2002 4:51 AM > To: CF-Talk > Subject: RE: CF's Most Wanted :: > > > Hi Peoples > > Well, I can say, since its public knowledge in some circles that locking > will no longer be required with Neo - the server will handle this side > of things. CFMX has addressed the fact that failure to lock shared > scope vairables will not cause memory corruption while a write operation > is in progress. > > **However**, you will still have to lock for the legitimate use - to > prevent synchronous activity ensuring that requests are requests are > processed one at a time. For example, if I am about to reread a cached > query I might decide that all requests that need this query should wait > so as to ensure that they have the newer data. > > Hope this helps! > > > > > > Neil > Team Macromedia > http://www.macromedia.com/go/team > > > ______________________________________________________________________ Your ad could be here. Monies from ads go to support these lists and provide more resources for the community. http://www.fusionauthority.com/ads.cfm FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Archives: http://www.mail-archive.com/cf-talk@houseoffusion.com/ Unsubscribe: http://www.houseoffusion.com/index.cfm?sidebar=lists
