On 4/24/2015 7:36 AM, Jay McCarthy wrote:
My point is that ONLY the result of make-parameter and parameterize is
saved from the thread. In Racket a "parameter" has nothing to do with
a function "argument". I believe you are confused by the two when you
say "There are 9 arguments...". If you follow that documentation link,
you'll see that "parameter" is a very specific thing in Racket and
very few programs use them at all.
I'm not using parameterize at all (at least not explicitly). I receive
a web request that has up to 9 arguments contained in its bindings.
(define (search request)
(let* [
(params (request-bindings request))
(cookies (request-cookies request))
(pid (find-cookie "pid" cookies))
(county (exists-binding? 'county params))
(state (exists-binding? 'state params))
(search-txt (exists-binding? 'query params))
(search-and (exists-binding? 'all params))
(search-or (exists-binding? 'any params))
(search-not (exists-binding? 'none params))
(page-size (exists-binding? 'page params))
(sort (exists-binding? 'sort params))
:
Using those arguments, I retrieve information from the database
regarding the client that issued the request and construct a complex
database query. When that query succeeds, I need to enter additional
accounting data for each result based on the client - but only for
results that the client actually sees (paging), not necessarily for
every result.
So I need to maintain a lot of state through a continuation: the open
database connection [to cache the query results in the database], the
current page that the client is looking at (for navigation), and ideally
the client information for accounting [though I could look that up again
if necessary].
George
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