[rules-users] Drools Expert: monitor rules & report activity

Tue Aug 3 16:41:27 EDT 2010

Drools(5.1+) has already added functionality to monitor rule activity in
your application using JMX. You can turn mbean rule monitoring on either
in the rulebase's configuration file(drools.mbeans=enabled||disabled) or
you can configure it through the command
line(-Ddrools.mbeans=enabled||disabled I believe). 

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Dieter
D'haeyere
Sent: Tuesday, August 03, 2010 9:49 AM
To: Rules Users List
Subject: Re: [rules-users] Drools Expert: monitor rules & report
activity

What I mean with 'all possible cases' is eg. that you will pass your
facts to the rule engine and that the rule engine will 'return' some
result.
I guess it is perfectly possible that in your test scenario's you
covered a lot of possible values for those facts but not all of them and
that you could get some unexpected results afterwards.
This would mean that your test scenario's / test data were not good
enough.  But I could imagine that stuff like this happens... At that
moment you should be able to see what rules were fired in a production
environment.

Ik will have a look at the drools execution server.

Dieter.

2010/8/3 Swindells, Thomas <TSwindells at nds.com>

Guvnor is a user interface used to define sets of rules, it's not
designed to be an actual execution server - the demo test scenarios only
work on static predefined data, in a real execution environment the
input data has to be acquired/loaded from somewhere dynamically, hence
you always need some form of development - though look at the drools
execution server to minimize this.

What do you actually mean by covering all possible cases anyway?
Possible cases of what? What are you trying to detect?

Thomas

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Dieter
D'haeyere
Sent: 03 August 2010 14:35
To: Rules Users List
Subject: Re: [rules-users] Drools Expert: monitor rules & report
activity

Ok, this looks like a way to handle it.
But does this mean that there is no 'out of the box' monitoring
possibility ?

When deploying a rule base (with Guvnor), I would kind of expect that
Guvnor is accessible and that it can return some metrics (eg. after
switching on a monitoring option because I presume continuous logging
would slow down the system too much).

As I understand it now, some custom development is needed will be needed
to achieve 'real-time' monitoring.

2010/8/3 David Sinclair <dsinclair at chariotsolutions.com>

Have a look at the AgendaEventListener. You can use these callbacks to
see which rules fire and information about them

 void

activationCancelled
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaEven
tListener.html#activationCancelled%28org.drools.event.rule.ActivationCan
celledEvent%29> (ActivationCancelledEvent
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/Activation
CancelledEvent.html>  event) 

 void

activationCreated
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaEven
tListener.html#activationCreated%28org.drools.event.rule.ActivationCreat
edEvent%29> (ActivationCreatedEvent
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/Activation
CreatedEvent.html>  event) 

 void

afterActivationFired
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaEven
tListener.html#afterActivationFired%28org.drools.event.rule.AfterActivat
ionFiredEvent%29> (AfterActivationFiredEvent
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AfterActiv
ationFiredEvent.html>  event) 

 void

agendaGroupPopped
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaEven
tListener.html#agendaGroupPopped%28org.drools.event.rule.AgendaGroupPopp
edEvent%29> (AgendaGroupPoppedEvent
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaGrou
pPoppedEvent.html>  event) 

 void

agendaGroupPushed
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaEven
tListener.html#agendaGroupPushed%28org.drools.event.rule.AgendaGroupPush
edEvent%29> (AgendaGroupPushedEvent
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaGrou
pPushedEvent.html>  event) 

 void

beforeActivationFired
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/AgendaEven
tListener.html#beforeActivationFired%28org.drools.event.rule.BeforeActiv
ationFiredEvent%29> (BeforeActivationFiredEvent
<http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/
trunk/target/javadocs/stable/drools-api/org/drools/event/rule/BeforeActi
vationFiredEvent.html>  event) 

2010/8/3 Dieter D'haeyere <dieter.dhaeyere at gmail.com>

@ll,
I have a question regarding the possibilities to monitor and report on
the rules activity.
I have seen that with Drools Guvnor, it is perfectly possible to monitor
scenario's, see what rules fired, etc.

Now, going further, I have two questions:
- Is it possible to monitor rule activity (which rules got fired etc) in
a production situation.  Eg. Is it possible to start recording activity
at some time until a proble occured and to review the logs afterwards.
This would be of use when scenario's are not covering all possible
cases.
- Is it possible to produce reports on rules, usage of rules (eg. what
rules are fired and what rules were fired most), performance, ... 
And if not, what could be a good starting point to create them ?

My experience with Drools is rather limited.  Let's say that I am
interested in expert system and technologies surrounding it.  At this
moment I am getting a 'theoretical' grip on Drools and its possibilities
(of course, I couldn't help also creating some kind of poc :)  ).

Sincerely,
Dieter D'haeyere.

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