[Seaside] 2.1 preview

[Julian Fitzell]

He of course means: http://beta4.com/seaside2/downloads/Seaside2.10.st.gz

:)

Julian

Avi Bryant wrote:
> Hi all,
> 
> I've put an early release of Seaside 2.1 up at
> http://beta4.com/seaside2/Seaside2.10.st.gz .
> 
> The main change in this release is that the old ManagedObject/IVAP method
> of instrumenting instance variable reads and writes is no longer used.
> Instead, it introduces an explicit stateTree instance variable which is
> used by components to read and write state that needs to rewind and
> fork for the back button.
> 
> Although you could directly use stateTree #at: and #at:put:, subclasses of
> WAComponent now also have an extra line in their class definition which
> allows you to declare stateVariableNames.  Accessors which go through the
> stateTree will be generated for each of these names.  For example,
> 
>   WAComponent subclass: #WACounter
> 	instanceVariableNames: ''
> 	stateVariableNames: 'count '
> 	classVariableNames: ''
> 	poolDictionaries: ''
> 	category: 'Seaside/Examples-Basic'
> 
> generates
> 
>   count
> 	^stateTree at: #count
> 
>   count: anObject
> 	stateTree at: #count put: anObject
> 
> 
> This change does raise the question of when it's appropiate to use
> stateVars instead of instVars.  When in doubt, it never hurts to make
> something a state variable (except for increased memory usage...).  As a
> rule of thumb, however, if you ever change the value of an instance
> variable *after* the component is first created and initialized, then it
> should probably be a stateVar.  Going through my own code, I found it
> interesting how few instance variables this applied to... I'm hopeful that
> making this distinction more explicit will lead to a better understanding
> of mutation patterns in general.
> 
> I'd appreciate it if people tried this out and let me know how they found
> the new approach.
> 
> Cheers,
> Avi
> 
> 
> 
> 
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