Re: [rules-users] Separate selectable drl files in drools kbase.. Or agenda groups
Hi Wolfgang,
Thanks for the suggestions. I have a few questions, does changing the focus on the RHS
work like :
kcontext.getKnowledgeRuntime().getAgenda().getAgendaGroup( "B to D"
).setFocus();
Do I need to import kcontext ? or is it implicitly in scope already ?
a low salience rule would set
the AG for the Spartan group and so on.
As I understand it, salience helps the engine decide "which" rule to run, when
one or more matches, but does that mean identical factors ,,
or just any that are applicable ?
Will the below example work ? Will "b only" fire last like I want it to ?
class Foo { boolean a; boolean b; }
(object inserted has a and b == true), Agenda-group Focus is set to
"Intialisation"
---
rule "a only"
agenda-group "Initialisation"
salience 10
when
Foo (a == true)
then
…
end
rule "a and b"
agenda-group "Initialisation"
salience 5
when
Foo (a == true, b == true)
then
…
end
rule "b only"
agenda-group "Initialisation"
salience 1
when
Foo (b == true)
then
kcontext.getKnowledgeRuntime().getAgenda().getAgendaGroup( "WorkerGroup"
).setFocus();
end
Many thanks
Ramon
Ramon Buckland
ramon(a)thebuckland.com
On 5 Jun 2013, at 06:47, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
You can change the focus on the RHS of a rule as well, using the
API.
Starting in the default agenda group, a low salience rule would set
the AG for the Spartan group and so on.
Notice that any attribute can be set in front of or in between rules to
become effective in successive rules. This should also work in XLS,
except that you may have to create three files for your three groups.
(The XLS parser isn't very intelligent, at least wasn't last time I was
looking.)
-W
On 04/06/2013, Ramon Buckland <ramon(a)thebuckland.com> wrote:
> Hi,
>
> I am using a Stateless Knowledge session backed behind a web rest api.
> The rest api is provided by spring Mvc, so I have a stateless ksession
> injected in.
>
> As it is stateless, I have found it difficult to use agenda groups to
> meet my need. And have a question to how I set this up.
>
> My task.
> In short, I have 10 or so set up rules (init rules), then a 300 odd
> (work) rules, then I need to fire a few (5) (finalisation) rules.
>
> They need to be processed in that order. If I were using stateful I
> see how an agenda group solves that need.. In the calling java that is
> nice. setFocus().. But stateless blocks that api.
>
> So I have attempted with auto-focus..
>
> In the DRL (from XLS) however getting the agenda group settings right
> has been a small 'mare. Suffice to say I haven't got it working.
>
> My options:
> 1. get agenda groups working.
> 2. split the three groups into 3 DRL files. and execute in sequence
> each one using a different ksession for each.
>
> --- on 1.
>
> How would I construct the flow.. .. Do I use three separate auto focus
> rules , one for each a.group and set a salience ( I don think
> salience helps here ) ? How do I guarantee to stack the focus using
> auto-focus to follow my ordering?
>
> -- on 2.
> Can I create a separate ksession for each DRL file (injecting them in
> from spring).
>
> --
> Thoughts ? Am I solving right ?
>
> Many thanks. Ramon
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