[rules-users] execute particular rules programmatically and dynamically

[Benson Fung]

The reason is that as the no. of rules in the rulebase grows, it is
possible that some of the rule can be re-used/shared for specific
purpose.

I am not sure this is the good reason.  Of course, like you said, if
it can solved by using agenda-group, activation-group, salience. That
will be wonderful.


Thanks

2011/3/31 Michael Anstis <michael.anstis at gmail.com>:
> Why would you want to execute a single rule?
>
> The logic you'd write to determine which rule to fire should itself be part
> of the rules: So, for example, if you want to validate facts of type "Smurf"
> then write a rule that matches on "Smurf". When you insert a "Smurf" only
> the rules that match on this will become candidates for execution when you
> call fireAllRules. Perhaps use of a stateless session would simplify things
> so you need not worry about other facts in WM "polluting" the results you
> expect to see?
>
> More and more questions are posted here asking how to make individual rules
> execute; IMO the solution is to change your thinking about how Rules Engines
> work.
>
> If you give your use-case we might be able to advise a better approach.
>
> With kind regards,
>
> Mike
>
> 2011/3/31 Wolfgang Laun <wolfgang.laun at gmail.com>
>>
>>
>> On 31 March 2011 07:58, Benson Fung <benson.redhat at gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> If there are 10 rules in the drools rulebase, and right now I would
>>> like to execute one of the particular rule.  Is there any approach/way
>>> to execute particular rule programmatically?
>>
>> No. The right hand side of a rule (code between "then" and "end") is
>> executed whenever there is a set of fact objects in Working Memory
>> satisfying the condition. If you insert such a set of facts and call
>> fireAllRules(), then it will happen.
>>
>>
>>>
>>>  I don't think
>>> agenda-group or activation-group can do that, right?  Or is it
>>> possible to create an agenda programmatically ?
>>
>> No to both.
>> -W
>>
>>>
>>> Thanks
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>>
>>
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