[rules-users] execute particular rules programmatically and dynamically

[Michael Anstis]

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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>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
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