[rules-users] execute particular rules programmatically and dynamically

[Benson Fung]

Hi Steven,

Would you share your case?


Thanks
Benson

2011/4/1 Steven Williams <stevearoonie at gmail.com>:
> I have actually used this method for the one valid case I have thought of -
> unit testing rules.
> Steve
>
>
> 2011/4/1 Swindells, Thomas <TSwindells at nds.com>
>>
>> Agreed,
>>
>> But if you really do want to you can setup an agenda filter so that only
>> the activation for the rule you care about is fired – but I don’t think
>> there are many valid cases where this is needed/desirable/appropriate.
>>
>>
>>
>> Thomas
>>
>>
>>
>> From: rules-users-bounces at lists.jboss.org
>> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Michael Anstis
>> Sent: 31 March 2011 10:08
>> To: Rules Users List
>> Subject: Re: [rules-users] execute particular rules programmatically and
>> dynamically
>>
>>
>>
>> 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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