[Bese-devel] isolated patch again (why it didn't go through.. or did it?)

[Drew Crampsie]

-------- Original Message --------
Subject: Re: [Bese-devel] isolated actions
Date: Wed, 05 Apr 2006 01:19:22 -0400
From: Drew Crampsie <drewc at tech.coop>
To: Evrim ULU <evrim at core.gen.tr>
CC: bese-devel at common-lisp.net
References: <4432CD47.5010304 at core.gen.tr>

Evrim ULU wrote:
> hi,
> 
> where do we use isolated actions in practice?

Isolated actions! doh! (they don't work in ucw for a while now and i
forgot to send the patch (attached)).

:isolate should be used when you only want an action to fire once, even
if the same link is clicked or the page reloaded.

For example, if i have an 'charge-credit-card' action, i would not want
a reload of the page or a 'back-button, click same link' to charge the
card _again_ (well, i wouldn't mind, but the customer might be pissed).
:ISOLATE memoizes the action body so that it will only run once,
regardless of how many times the same URL is hit.

The attached patch is against a slightly older ucw_dev. If it no longer
applies cleanly, the replacement code for DEFACTION follows (and
RUN-ISOLATED can be removed from standard-component.lisp).

Cheers,

drewc

(defmacro defaction (name &rest rest)
    (if (equal (car rest) :isolate)
        (with-unique-names (memo-id memo memo-present-p)
          `(defaction ,name ,(second rest)
            (let ((,memo-id
                   (strcat (mapcar (rcurry #'funcall *context*)
                                   (list #'find-session-id
                                         #'find-frame-id
                                         #'find-action-id)))))
            (multiple-value-bind (,memo ,memo-present-p)
                (gethash ,memo-id (component.isolate-hash ,(caar (second
rest))))
              (if  ,memo-present-p
                   ,memo
                   (setf (gethash ,memo-id (component.isolate-hash ,(caar
(second rest))))
                         (progn ,@ (cddr rest))))))))

        `(%defaction ,name , at rest)))



> 
> king regards,
> evrim.
> _______________________________________________
> bese-devel mailing list
> bese-devel at common-lisp.net
> http://common-lisp.net/cgi-bin/mailman/listinfo/bese-devel


-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: isolate.patch
URL: <https://mailman.common-lisp.net/pipermail/bese-devel/attachments/20060405/a3491aa3/attachment.ksh>