[Smallwiki] Re: Context-#session

[Keith Hodges]

> I see, this is not really useful if you use a persistency mechanism  
> that dumps out the whole objects. The idea was that Pier knows using  
>   
Indeed.

> the description what parts of the objects to serialize, something  
> that is probably not easily controllable with a framework using the  
> Smalltalk reach-ability to serialize objects.
>
> So I would suggest that you remove this cache.
>
>   
It seems that most of the properties in PRContext are not very useful 
when persisted.

My current approach explicitly copies the parts of the object that I 
wish to persist, and so now it is not absolutely necessary to remove 
this cache.  I have removed Pier-Magma's use of this cache, and so it 
remains to see who else actually uses it.
> What's the trouble with MAProxyObject instances?
>
>   
I am not really sure of the ins and outs of this. I think that Magma was 
attempting to serialise part of the PRContext structure at the time. The 
proxy was to an Array of Commands, containing 8 items. Magma was looping 
through them to serialise them and asked for maInstSize which returned 9 
rather than 8, owing to the fact that ProtoObject (i.e MAProxyObject)  
returns maInstSize as (^self class instSize + self basicSize )  
differently to Object. I.e. the call to maInstSize is not being proxied. 
A fix would be to add an explicit maInstSize to MAProxyObject. I suspect 
that it would be worth setting up a test case for this one and to work 
out just what the desired behaviour actually is.

Keith





		
___________________________________________________________ 
The all-new Yahoo! Mail goes wherever you go - free your email address from your Internet provider. http://uk.docs.yahoo.com/nowyoucan.html