On Thursday 14 September 2006 16:12, Jurgen Beck wrote:
> I see two solutions:

I have actually seen the 2nd in use on (I think) ticketmaster - during check 
out it told me the seats were reserved for 20 minutes, and if I hadn't payed 
by then I'd lose them and they'd go back in the pool.

You could probably calculate the chance of a collitsion based on the length of 
time it takes to do a booking, how many customers there are (at once) and how 
many seats there are.
If the chance in low, and fairly simple 'soft reserve' like the above or you 
option 2 is going to be best, I feel.
OTOH, if collisions are going to be frequent, you want to be more proactive to 
help the users out - but at the end of the day, two people might just 
press 'submit' at the same time, and one of them is going to get a rolled 
back transaction and 'please choose another seat'. The other party may back 
out later, but there isn't much I think you can do about that.

-- 
Tom Chiverton
Helping to confidentially create open-source bandwidth

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