[Seaside] Re: Seaside and GOODS

[Yar Hwee Boon]

On 17-Mar-05, at PM 10:59, Avi Bryant wrote:

> self session writeableVersionOf: someObject do:
>    [:obj |
>    ....]
>
> We could also hook this up to a dirty-marking policy so that
> WriteBarrier wasn't needed.  A little extra work, but a lot of
> benefit.  Neat.
>
> We'd probably also want some kind of expiring cache policy on the
> read-only version of the session, so you didn't end up with the whole
> DB in your image, but that should be pretty doable.

I've put up a version at 
http://motionobj.com/squeak/GOODS-hboon.81.mcz. It doesn't do much 
except providing a KKReadOnlyDatabase class that stubs out methods such 
as #commit and #rollback with errors and not putting the objects behind 
a writebarrier. The expiring cache policy is not implemented, so 
there's a possibility that the image can become quite bloated. 
Basically, I'll have WASession>>withEscapeContinuation: overridden as

withEscapeContinuation: aBlock
	self commonDatabase refresh.
	^ self database
		commitWithRetry: [super withEscapeContinuation: aBlock]

I haven't actually used this :) Maybe someone using GOODS with a 
moderate load can try it out.

--
HweeBoon
MotionObj
(65) 6764-9774