[rules-users] Guvnor and drools implementation - questions

[Wolfgang Laun]

2011/3/1 ioda100 <eddyhautot at gmail.com>

> Thanks for your quick answer Esteban.
>
> 1) Ok i will have a look at DSL. In fact in my map i know all the
> properties (about 200). It would be cool to be able to have a drop down list
> with all these attributes as when we do it with objects for which we gave
> Pojo to Guvnor.
>
>
> 2) Yes i set the global constant i my application and put it in the
> session. But when a rule fire, it has to send back a value "OK" for example
> to the application. So i use the global consatnt to do that. As you say
> guvnor don't create a working memory (needed to change the global constant),
> i have to write by hand the lines : WorkingMemory wm =
> drools.getWorkingMemory();
> wm.setGlobal("resultValue", "OK"); ?
>
> I would not change the entire global object; I would just change a field:
   global Result result;
   ...
   then
       result.setValue( "OK ");



> i use version 5.1 of drools and guvnor.
>
> 3) ok i will stay with this solution. yes i only need to stop after the end
> of the rule that has successfully fired. I have tried other things like
> workingMemory.stop() or something like this but it was not working.
>
>
Calling fireUntilHalt() and calling halt() from an ActivationEventListener
would be a technique that doesn't require any messing with the rules.
(Except, to be on the safe side, the addition of a very low-salience rule
acting as a sentinel if nothing else fires.)

-W


> Thank you again
>
>
>
> On Tue, Mar 1, 2011 at 1:55 PM, Esteban [via Drools - Java Rules Engine] <[hidden
> email] <http://user/SendEmail.jtp?type=node&node=2603551&i=0>> wrote:
>
>> Hi,
>>
>> 1) my facts are in fact java Maps, is there an easy way to deal with them
>> in
>> guvnor? it's not like in the example where facts are objects and we give
>> guvnor the Pojo model to know what we can do with it
>>
>> for example i have :
>> $m  : Map((this["attribute1_of_the_map"] == "test1"))
>>
>> How to deal with the map and have a prepopulated list of properties of the
>> map? And to store it in the variable $m. Without using the "free from drl"
>> where we have to write it by hand.
>>
>>  I think you could use DSL for achieve this. You could define your own DSL
>> saying for example *There is a Test=Map((this["attribute1_of_the_map"] ==
>> "test1" *I would leave the variable binding to the editor. So when you
>> add this particular pattern to a rule, you can bind it it you want to.
>>
>> 2) how to deal with global constant with guvnor?
>>
>> i have something like :
>> WorkingMemory wm = drools.getWorkingMemory();
>> wm.setGlobal("resultValue", "OK");
>>
>> Is it a direct way to play with global constant in Guvnor? Without using
>> the
>> "free from drl" where we have to write it by hand.
>>
>> The values of the globals are set in runtime. Guvnor doesn't create any
>> ksession (or working memory) for rules authoring. There is no need to do
>> that. So, you can declare your globals in Guvnor's package area  and then
>> use them in your rules. When an application uses these rules, and creates a
>> ksession from them, it must provide the value for these globals.
>> By the way, which version of Drools are you using?
>>
>> 3) for stopping firing rules after one rule fire successfully, do you know
>> if there is an option to do that?
>> For now i insert a boolean in the session and the first condition in all
>> my
>> rules is that this boolean is there. When a rule fires successfully, i
>> retract it. I suppose there is a bettre way to do it?
>>
>> I think the approach you have chosen is elegant enough. Of course that it
>> will only prevents new activations to happen but it will not prevent current
>> activations to be executed. For a cleaner implementation, you can make a
>> super-rule with that condition and then make all your rules to inherit from
>> it.
>> There is actually a way to force the engine to stop (I don't remember it,
>> but I'm pretty sure it is documented), but I don't know if that would be the
>> best solution since I don't know if it has any collateral effect.
>>
>> Best Regards,
>>
>>
>> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>>
>> Esteban Aliverti
>> - Developer @ http://www.plugtree.com
>> - Blog @ http://ilesteban.wordpress.com
>>
>>
>> On Tue, Mar 1, 2011 at 9:27 AM, ioda100 <[hidden email]<http://user/SendEmail.jtp?type=node&node=2602877&i=0>
>> > wrote:
>>
>>> Hi,
>>>
>>> i have a few questions :
>>>
>>> 1) my facts are in fact java Maps, is there an easy way to deal with them
>>> in
>>> guvnor? it's not like in the example where facts are objects and we give
>>> guvnor the Pojo model to know what we can do with it
>>>
>>> for example i have :
>>> $m  : Map((this["attribute1_of_the_map"] == "test1"))
>>>
>>> How to deal with the map and have a prepopulated list of properties of
>>> the
>>> map? And to store it in the variable $m. Without using the "free from
>>> drl"
>>> where we have to write it by hand.
>>>
>>> 2) how to deal with global constant with guvnor?
>>>
>>> i have something like :
>>> WorkingMemory wm = drools.getWorkingMemory();
>>> wm.setGlobal("resultValue", "OK");
>>>
>>> Is it a direct way to play with global constant in Guvnor? Without using
>>> the
>>> "free from drl" where we have to write it by hand.
>>>
>>> 3) for stopping firing rules after one rule fire successfully, do you
>>> know
>>> if there is an option to do that?
>>> For now i insert a boolean in the session and the first condition in all
>>> my
>>> rules is that this boolean is there. When a rule fires successfully, i
>>> retract it. I suppose there is a bettre way to do it?
>>>
>>> Thanks in advance for your help
>>>
>>> --
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