Raymond Camden's "Tips for CFMX-ifying your ColdFusion 5 Applications" (http://www.macromedia.com/devnet/mx/coldfusion/articles/updating_legacy.html) discusses the need to only lock in case of race conditions. If your application uses *any* persistent scopes (client vars included) you have to deal with the concept of a user opening up, for example, a second window. However a cflock will not help you in such a case. You'll get one set of writes from one window, and a corrupting set from the second *perhaps*, but the solution to that won't come from cflock. This is something you'll have to assess when you look at your app and what it does.
Its woth mentioning that, given the race-conditions-only proviso now in effect for CFLOCK, and the fact that there is no longer any issue with thread safety or server stability, you can consider whether or not you want to ignore *benign* race conditions. For example, if you have the statement "You are visitor #application.thiscount# today" you may well ask "who cares if the count is of by a couple?" If the answer is that it doesn't matter, you can skip locking the write and reads of this variable. A more realistic example would be your datasource access info. The name, username and password is commonly tossed in the application scope. It rarely changes if ever. Same with stuff like paths. In turn these are often converted to the request scope so they can be used without locking in for example a cfquery statement. Here's another example where you can set the vars once in the application scope, not bother with a lock and use the application vars directly in cfquery statements, without locking and dispensing with the conversion to request vars. Likewise if a user logs in and you are storing login and permission information in a client scope rather than session, then that info ports well into the session scope and can be used without locks, assuming that the user isn't going to be switching permission levels willy-nilly. Search the archives here and you'll find a lot -- and I mean a LOT -- of information on this. Cheers, -- --mattRobertson-- Janitor, MSB Web Systems mysecretbase.com ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Logware (www.logware.us): a new and convenient web-based time tracking application. Start tracking and documenting hours spent on a project or with a client with Logware today. Try it for free with a 15 day trial account. http://www.houseoffusion.com/banners/view.cfm?bannerid=67 Message: http://www.houseoffusion.com/lists.cfm/link=i:4:205992 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=11502.10531.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
