Application-scoped instances are a wonderful thing. And having a clustered environment makes them easier to deal with, not harder, because you can take a server out of the cluster, let it rebuild it's in-memory instances without load, and then reinject it. Repeat for the rest of the cluster, and you've got a zero-downtime upgrade. If you've got a large cluster, best to take half the servers down, upgrade them, then switch halves. As long as you don't need more than half your servers to deal with the load (which you shouldn't, because you should do upgrade under non-peak load, and most load cycles are more than 50% deltas), you can do it all in two steps.
Particularly with larger applications, instantiating a large number of CFC instances on every request (rather than leaving them in the application scope across requests) can be a real bottleneck. Hundreds or thousands of milliseconds per request, if the instances need to do complex initialization. Almost always better to cache the instances. Just watch out for potential race conditions as multiple requests can be accessing the shared instances at any given time. cheers, barneyb On 6/9/05, Douglas Knudsen <[EMAIL PROTECTED]> wrote: > I'd suggest keeping gateways with objects or purposes, having a site-wide > one will certainly tend to grow to immense porpotions. This from a bad > experience following me around where I work. Also, IMHO, stay away from > application scoped cfc instances unless you really really need them. They > are a PITA when you need to update the code, most notably when you are in a > clustered environment. > > DK -- Barney Boisvert [EMAIL PROTECTED] 360.319.6145 http://www.barneyb.com/ Got Gmail? I have 50 invites. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Discover CFTicket - The leading ColdFusion Help Desk and Trouble Ticket application http://www.houseoffusion.com/banners/view.cfm?bannerid=48 Message: http://www.houseoffusion.com/lists.cfm/link=i:4:209152 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
