[Seaside] WATransaction & WATransactionStack?

[Avi Bryant]

On Fri, 31 Jan 2003, Stephen Pair wrote:

> How are these classes used?  In looking at the system, it's not apparent
> to me that these classes are used at all.  Are these a left over from
> when you were doing more implicit management of the state of
> WAComponents?

No, they have nothing to do with that.  They are used in the
implementation of WASession>>isolate:.  There's an example use (in recent
releases anyway) in the WATransactionTest (registered under /seaside/txn).

The idea is that if you put code inside an #isolate: block, any pages
created during that block will immediately expire as soon as the block
ends.  I use this, for example, to surround an entire sale in a
point-of-sale application: once payment has been received, you're not
allowed to use the back button to modify the contents of the shopping
cart...

Avi