[rules-users] need some advice in defining rules

[David Sinclair]

Hi Brody,

Can you put the week number on the reminder object and assert all the
reminders into working memory? That would give you a lot more options. For
example, if you were to do that, you could construct a rule like the
following

when
       Week($number : weekNumber)
       java.util.List(size > 5)  from collect (Reminder(weekNumber ==
$number))
then
       insert(new LimitedReach($number));

-- OR --

rule "Create summaries"
        no-loop true
when
        Reminder($weekNumber :weekNumber)
        not (WeekSummary(weekNumber == $weekNumber)
then
        insert(new WeekSummary($weekNumber))

rule "Summarize Reminders
     no-loop true
when
        Reminder($weekNumber : weekNumber)
        $sum : WeekSummary(weekNumber == $weekNumber)
then
        int numberReminders = $sum.getTotalReminders() + 1

        modify($sum) {
             totalReminders= numberReminders
        }

then have a rule to enforce the Summaries aren't over the limit. More
facts/attributes you have in WM to reason over, the more possible solutions
you have.

On Mon, Apr 27, 2009 at 12:08 PM, Brody bach <brodybach at yahoo.com> wrote:

>
> Hi all,
>
> I'm having difficulty in defining a rule for the following problem:
> We need to check if within a week there are more than 5 objects of type
> Reminder inserted into Memory.
> (one day corresponds to one object)
> The number of the inserted objects depends on the usage of the application.
> That means there could be nothing, 1, 2, or any number of the objects.
> Before, within a session, I inserted a list containg data from within one
> week (7 days).
> Than I can check using the rule:
> when:
> $list : list(size > 5)
> Reminder() from $list
> no String(trim == "limit reached");
> then
> System.out.println("This rule fires");
> insert new String("limit reached");
>
> Now I need to insert a list containing data from a whole month, but I still
> need to check whether within one week there are more than 5 reminders
> exist.
>
> so, the constraint list> 5 can't be used anymore for a single list. I tried
> to break the whole list in several smaller list, where each list represents
> one week.
> Now the problem is, if the rule fires for a certain week, than it won't
> work
> for the following weeks anymore.
>
> My idea is then to insert an integer containing specific number to the
> current list, i.e. the calendar week (i.e insert new Integer(52)) and then
> to prove this in LHS; but the problem is now how to prove the week number
> in
> LHS? as I remeber, a function can only be called within an eval statement
> and  in this case actually I should only prove the existence of an Integer
>
> Hope my explanation is quite understandable and looking forward for any
> hints
>
> Regards
>
> --
> View this message in context:
> http://www.nabble.com/need-some-advice-in-defining-rules-tp23259683p23259683.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
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