[rules-users] Drool 5 API and Agenda Listeners

[Pegram, Macon]

Using the listener, you could construct your own agenda stack to track
what's going on.  The AgendaEventListener interface has the methods:
    agendaGroupPopped(AgendaGroupPoppedEvent event) 
    agendaGroupPushed(AgendaGroupPushedEvent event)
    
In your listener, construct a java.util.Stack, and just Push/Pop
agenda-group information that you retrieve from the AgendaGroupXXXEvent
onto/off of your internal Stack.  You can do similar tracking of event
firing with the "before" or "after" ActivationFired event.  Construct a
list to capture the sequence of events.  

I'm not entirely clear on what you're trying to accomplish, but the
event listener interface provides hook points for all the related events
on the agenda, so you should be able to craft a listener to do whatever
you need.  I've used a similar mechanism in unit testing to validate
correct processing of a set of agenda groups.  

Macon

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of SPAAARKY21
Sent: Sunday, October 11, 2009 7:34 PM
To: rules-users at lists.jboss.org
Subject: Re: [rules-users] Drool 5 API and Agenda Listeners


Thanks for clearing that up for me.

As for the agenda, I am writing an agenda listener already but the
problem
is getting the information I want.  In Drools 5, an
org.drools.event.rule.AgendaEventListener's afterActivationFired()
method
takes an org.drools.event.rule.AfterActivationFiredEvent object but
where do
I go from there?  The getKnowledgeRuntime() method returns a
KnowledgeRuntime, which has a getAgenda() method that returns an
org.drools.runtime.rule.Agenda.  But that Agenda doesn't have methods
for
getting all of the agenda groups on the focus stack.  It only has
methods to
clear the agenda or get an activation/agenda/rule flow group by name.
What
I am looking for is a way to get all of the agenda groups on the focus
stack
(as a List or through an Iterator,) and then get each activation from
each
one of those groups.

In Drools 4, I would have been using an org.drools.Agenda instead, which
has
a getAgendaGroups() method and AgendaGroup has a getActivations()
method. 
In a Drools 5 org.drools.runtime.rule.AgendaGroup, there are only three
methods - clear(), getName() and setFocus() - so even if I could get all
of
the AgendaGroups, it wouldn't do me any good.  Do you see why I'm having
trouble doing anything useful with the new API?  In Drool 5, are you
supposed to approach this in a different way (not in an agenda
listener?)


Pegram, Macon wrote:
> 
> The primary reason to move to the "Knowledge APIs" apart from what
> you've already mentioned is that they help to bring together the
newest
> features of Drools.  In a single KnowledgeBase you can now have not
only
> rules, but Flows, and Complex Event Processing.   
> 
> As to tracking activity on the agenda... there's two ways...
> 1. If you're using Eclipse, one great feature of the Drools plugin is
> the Audit Log.  You can start logging with the following code:
> KnowledgeRuntimeLogger logger =
> KnowledgeRuntimeLoggerFactory.newFileLogger(knowledgeSession,
FILENAME);
> Then open the resulting log in the Eclipse Drools Audit Log tab and
get
> a pretty good graphical representation of what happened during your
run.
> See the following URL for a screenshot:
>
http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/h
> tml_single/index.html#d0e6801
> 
> 2. Create your own AgendaEventListener.   Simply implement the
interface
> and place whatever actions you want on each event.  Then attach it to
> your session before you start processing like this:
> knowledgeSession.addEventListener(new YourAgendaListener());
> 
> Macon
> 
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of SPAAARKY21
> Sent: Sunday, October 11, 2009 12:26 PM
> To: rules-users at lists.jboss.org
> Subject: [rules-users] Drool 5 API and Agenda Listeners
> 
> 
> I recently moved from Drool 4 to 5 in a little example application I
had
> written.  At first I hesitated because I thought the API had changed
> drastically. When I did upgrade, I found that there were few changes. 
> However, I was still using all of the "Rule" classes instead of the
> "Knowledge" classes - like RuleBase and StatefulRuleSession instead of
> KnowledgeBase and StatefulKnowledgeBase.  It sounds like the
"Knowledge"
> API
> is the way of the future so to speak but I haven't been able to find
> much
> information on it.  What is the advantage in using the new "Knowledge"
> API? 
> Will the "Rule" API become deprecated at some point?
> 
> Anyway, after switching to the Knowledge API, I have been working on
an
> agenda listener I had written.  What I want to do is iterate through
> agenda
> groups on the focus stack and, for each group, iterate through the
> activations in the order in which they are queued up.  However, I
don't
> see
> any way to do that.  In fact, since switching to Drools 5 and the
> "Knowledge" API, it looks like the API for dealing with the agenda and
> activations and whatnot has become quite small.  Or at least it is
when
> you
> stick to the interfaces.  Am I missing a better way of doing this?
> 
> Brandon
> -- 
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