Re: [Jscheme-user] webapps

[Timothy H. <tim...@ma...>]

On Wednesday, January 15, 2003, at 11:04 PM, root wrote:

> I am working on a webapp  and would like to have
> a session persistance schemebean? I am not sure if
> this is the proper term. The idea is to create
> a jscheme instance, init it with state and procedures etc,
> and then save it as a session object. Servlets could
> execute eval methods on it like (.eval schemeObject args),
Jscheme doesn't have first class environments for evaling into,
but you can store Jscheme objects (lambda, lists, etc.)
into session attributes:

(servlet (a b c)
  (let* ((ses  (.getSession request))
            (mylambda (.getAttribute  ses "mylambda")))
     (if (equal? #null mylambda)
        (.setAttribute ses "mylambda" (lambda R .....)))
     ...
     (mylambda 123 'abc #(1 2 3))
    ..
  ))


>
> This would let me put things like jdbc statements,
> lambdas and such that could be shared among servlets in a
> session.
This lets you share Jscheme objects among servlets within a session
but doesn't let you eval into an environment. You have to reconstruct the
environment each time using .getAttribute ...
>
> What is the best way to do this or am I on the wrong track...
does this help???
---Tim---

>
> thanks
> davud
>
>
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