[rules-users] Guvnor and drools implementation - questions

[ioda100]

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 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.

Thank you again



On Tue, Mar 1, 2011 at 1:55 PM, Esteban [via Drools - Java Rules Engine] <
ml-node+2602877-745781886-237284 at n3.nabble.com> 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
>>
>> --
>> View this message in context:
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