[rules-users] Rule activation when using from

[Wolfgang Laun]

If there's no change in the WM, no rule will fire (except for fancy things like
rules with a timer). This is so because that't the whole point of a production
system. It'll have to be a fact, inserted or modified.

-W

On 19/03/2013, wumb <wumb at gameduell.de> wrote:
> Because it's not a fact, it's a global.
>
> What i basically want to do is to have one rule being fired exactly once
> for every call of fireAllRules(). The rule will operate on a global,
> that is why i asked the question this way.
>
> What would be the best/simplest way to fulfill that requirement? I know
> this can be solved by inserting a fact before calling fireAllRules().
> But i am looking for  a solution which does not envolve "external" fact
> insertion. It should be solved by the rules itself.
>
> Any idea?
>
>
> On 03/19/2013 02:43 PM, Wolfgang Laun wrote:
>> Since there's no way to achieve what you'd like to do:
>> why don't you simply retract and reinsert the Calendar
>> fact?
>>
>> -W
>>
>> On 19/03/2013, wumb <wumb at gameduell.de> wrote:
>>>
>>> Hi,
>>>
>>> is there a way to make drools re-evaluate the LHS of a rule when using
>>> from? What I try to achieve is, that following rule is evaluated for
>>> every call of fireAllRules() :
>>>
>>> global java.util.Calendar cal
>>>
>>> rule "test"
>>> when
>>>       java.util.Calendar() from cal
>>> then
>>>       System.out.println("here we go");
>>> end
>>>
>>>
>>> Drools evaluates the rule only in the first call of fireAllRules().
>>>
>>>
>>>
>>> Kind regards
>>>
>>>
>>>
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>
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