[rules-users] Drool 5 API and Agenda Listeners

[SPAAARKY21]

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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