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Classics Forum

RE: IDS 11 optimistic locking

Posted By: Ian Michael Gumby
Date: Thursday, 15 November 2007, at 9:49 a.m.

In Response To: RE: IDS 11 optimistic locking (Obnoxio The Clown)

> Ian Michael Gumby said: > > If you were doing a virtual catalogue for a shop, do you make it two > > tiered or > > three tiered? > > I guess that's a good example.... > > Is a virtual catalogue for a shop a transactional system? Do you need to > lock rows to present a catalogue? > Now you want to talk about design specifics....

In a virtual shop, you don't need to lock rows until you're adding something to your cart and when you check out and process the Transaction. (capital T because this transaction is the actual purchase and not a database transaction.)

When you add something to your cart, you need to put a hold on the inventory for as long as the cart is active, so that you can properly reflect the inventory and gurantee that the product would be available for delivery.

This is why you end up with a three tiered system because there exists store side business logic that needs to sit outside of the database. While the "web" is stateless, the web server is not.
A shopping cart has a state and a time to live.

Could you design a two tiered application to do the same thing? (Which is what got this argument started..) Sure, but then you'll have a nightmare in managing connections and when you try to go to connection pooling... well then the web infrastructure is already in place...)

Which gets back to the point is that some apps are well suited to a web environment.

But to the deeper point... The look/feel/logistics/scripting/languages issues is still open to debate.

Do hibernate/spring scale? (Maybe well enough for most apps)
Do you build everything in Java environment?
Ruby? (RoR)
Python as a replacement to PHP?
Or do you stick with PHP and Javascript.

I agree that the front end development as a whole is still not streamlined.

And a counter to the examples, which goes back to your point. An Order entry or CRM HelpDesk application may not be the best system to be placed on a web. (Order entry clerks are more efficient if they can keep their hands on the keyboard and not have to try and find a mouse.)

Like I said, it swings both ways.

And since we've brought up the Mac, If you've played in the NeXT areana, there was their InterfaceBuilder environment that I believe is also on a Mac these days....

(But what do I know? My NeXT certification is from '92 and I haven't played with Objective C in ages. ;-)

-G

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