[rules-users] Newbie question: can I create a variable in the rules file?

[Michael Neale]

hi Kris.

Well, you can't bind a variable to a new instance on the LHS - on the LHS
you have no control over when conditions are evaluated, so the value of
"now" would not necessarily be what you think.

Nevertheless, I can see what you want:


rule CanDoHisStuff
  activation-group "permissions"
when
  c: PermissionCheck(name == "stuff", action == "do", granted = false)

  ap: AppProps(startDate < ( now() ), endDate > ( now() ) )
  Role(name == "A Role")

then
  c.grant();
end;

this assumes you have a function :

function Date now()
 return new Date();
end

(I havent' tested this, just a suggestion).


On 3/8/07, Rented User <rented at gmail.com> wrote:
>
> Hi,
>
> I'm mew to this rules stuff, and although I've looked at rules engines
> such as Corticon before, I got introduced to JBoss Rules through JBoss
> Seam's security mechanism.
>
> I'm trying to expand on Seam's built in functionality to assess a user's
> permissions. My use case is that a user of the system may or may not have
> permission to a resource based on the user's role AND the current date. The
> system accepts certain actions only if "now" is between a certain start and
> end date. What I'd like to do is something like this:
>
> rule CanDoHisStuff
>   activation-group "permissions"
> when
>   c: PermissionCheck(name == "stuff", action == "do", granted = false)
>   now: new Date()
> <--------------------------------------------------------------How can I
> accomplish this?
>   ap: AppProps()
>   Role(name == "A Role")
>  eval(now >= ap.startDate, now <= ap.endDate)
> then
>   c.grant();
> end;
>
> Now, I understand that in my code, I could assert an object "now".
> However, a lot of the security is hidden behind the scenes in Seam. For
> example, this rules will be fired from an XML definition file. E.g.
>
>     <page view-id="/restricted/doStuff.xhtml">
>         <restrict>#{s:hasPermission('stuff', 'do', null)}</restrict>
>         <navigation from-action="#{ createStuffManager.yesConfirmSave}">
>             <end-conversation/>
>             <redirect view-id="/restricted/viewStuff.xhtml"/>
>         </navigation>
>     </page>
>
> While I could start extending Seam's security model, that seems a bit
> invasive for such a simple task.
>
> Thanks
>
> /Kris
>
>
>
>
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