I am working on a system that signs customers up for workshops. Some of these workshops have limited capacity. The issue comes in that customers could run the same code simultaneously. Two customers could check capacity and find that room is available and the both sign up for the last avilable spot.
One solution would be to put a cflock around the code that checks the capacity and adds the customer if there is room. The problem is that we run on multiple servers updating the same database. It would be possible for customers to similtaneously run the same code from different servers.
This led me to thinking about using database locks but the way I understand CF data sources is that there is no way to ensure sequential queries go to the same database session. Since database locks are database session based this would make database locking not work. Am I correct in that?
The only way I can think of is to try to do it in a stored procedure and I would rather not. Does anyone have any other ideas?
Thanks in advance.
PS I am using cf6.1