[rules-users] Testing the count of a pattern binding variable
Stephen Masters
stephen.masters at me.com
Tue Feb 19 05:29:57 EST 2013
Assuming that you don't have an infinite variety of accumulations you're trying to use, something I have done previously is to create DRL technical rule to generate accumulated values, which the DSL then uses as constraints.
i.e.
rule "Generate sensor counts"
when
$sensor : Sensor()
accumulate($sensor; $count:count(1); $count >3)
then
insert(new SensorCount($count));
end
… then your DSL can be something simple like:
When there are more than 5 sensors = SensorCount(count > 5)
On 19 Feb 2013, at 06:21, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
> What (I think) you are trying to do is not possible.
>
> But I wouldn't say that it cannot be done using DSL. What sort of
> collect/accumulate do you need?
>
> -W
>
> On 18/02/2013, David R Robison <drrobison at openroadsconsulting.com> wrote:
>> I am developing rules using DSL so, from what I understand, I cannot use
>> collect and accumulate in some of my DSL definitions (especially when
>> using clauses that begin with a hyphen). So what I want to do is to test
>> the count of a pattern binding variable, such as
>>
>> when
>> $sensors : Sensor()
>> accumulate($sensor; $count : count(1); $count > 3)
>> then
>> ...
>>
>> Is something like this possible? I cannot seem to make it work.
>> David
>>
>> --
>>
>> David R Robison
>> Open Roads Consulting, Inc.
>> 103 Watson Road, Chesapeake, VA 23320
>> phone: (757) 546-3401
>> e-mail: drrobison at openroadsconsulting.com
>> web: http://openroadsconsulting.com
>> blog: http://therobe.blogspot.com
>> book:
>> http://www.xulonpress.com/bookstore/bookdetail.php?PB_ISBN=9781597816526
>>
>>
>>
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