[rules-users] can drools support complex rules (resetting of Accumulate?)
hrishikesh.varma at wipro.com
hrishikesh.varma at wipro.com
Fri May 22 00:24:40 EDT 2009
Hi,
That's the first thought I had too!
But that way, I'll be getting an "alarm" for every event after $times
reached 10.
Ideally, I'd want the accumulate method to restart "accumulation" once
the RHS is triggered - so effectively the RHS would then be triggered
for every "distinct" 10 events accumulated.
Any out of the box solution for this?
Also, am wondering - if some of us can pitch in effort and come up with
a more detailed document on the Rule Language specifically? Going
through most of the mails, I feel that's the only learning curve - we
can make that even less challenging - like an "Advanced DRLs for
Dummies" :) ?
But before that... the resetting of my accumulator count, any ideas?
Cheers,
Rishi
----------------------------------------------------------------------
Message: 1
Date: Thu, 21 May 2009 18:16:01 +0200
From: Wolfgang Laun <wolfgang.laun at gmail.com>
Subject: Re: [rules-users] can drools support complex rules (resetting
of Accumulate?)
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID:
<17de7ee80905210916gfddba51h35bf639ccf5af18a at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Well, it's definitely not forbidden to do a little computational work on
the
RHS, too.
Bind the result to a variable:
Number( $times : intValue > 10 )...
and, on the RHS, do
for( int i = 1; i <= $times % 10; i++ ) shout( "alarm" );
or whatever.
-W
On Thu, May 21, 2009 at 4:21 PM, <hrishikesh.varma at wipro.com> wrote:
> Hi,
>
>
> Temporal Reasoning with Accumulate - (like 3- rule "Customer login
from
> more than 5 locations in the last one month")
>
> What if I want to reset my count for accumulate within the time
> specified sliding window.So that I can have the RHS triggered for
every
> 10times the event occurs in the same window.
> For Example:
>
> when
> $customer : Customer( $id : id )
> Number( intValue > 10 ) from accumulate(
> CustomerLogin( loginStatus=="Failed", customerId
==
> $id,$cusId:customerId)
> over window:time( 30s ),
> count( $ cusId) )
> then
> // do something as the customer had abnormal number of failed
> violations in last 30 secs.
> end
>
>
> Right now am doing something similar, but using a manual approach -of
> explicitly counting.
>
> Any Light on this?
>
> Regards
> Rishi
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 19 May 2009 11:17:41 -0400
> From: Edson Tirelli <tirelli at post.com>
> Subject: Re: [rules-users] can drools support complex rules
> To: Rules Users List <rules-users at lists.jboss.org>
> Message-ID:
> <e6dd5ba30905190817q33d15b9er5efee64bc74cdb0e at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> Your question is funny. First you ask if Drools is capable of
> managing
> complex rules and then you mention examples of extremely simple rules?
> :)
>
> Drools is FOL complete and so can represent any well formed First
> Order
> Logic expression. Anyway, I will use this message to advertise some of
> the
> temporal reasoning features that we have on Drools 5 for the benefit
of
> anyone interested.
>
> There are several ways of authoring such rules, depending on how
> you
> model your problem domain. One possible way of doing them is:
>
> #1:
> rule "If a customer login within 5 minutes from two different
locations,
> mark the user invalid."
> when
> $l1 : CustomerLogin( )
> $l2 : CustomerLogin( userId == l1.$id, location != $l1.id,
> timestamp
> after[0s, 5m] $l1.timestamp )
> then
> // mark user as invalid
> end
>
> In the previous example I assumed both login objects would be in
working
> memory, but you can easily query for the previous login in an external
> datasource, pulling the data from the previous login on-demand for the
> reasoning cycle.
>
> #2:
> rule "If the customer location is not on a list of valid locations,
mark
> the
> user invalid"
> when
> $l : CustomerLogin( location not memberOf $validLocations )
> then
> // mark the user invalid
> end
>
> In the above rule, I assume the valid locations list is a global list,
> but
> you can as easily model locations as being facts on your working
memory
> or a
> service end point that you can call to validate the location.
>
> #3:
> rule "Customer login from more than 5 locations in the last one month"
> when
> $customer : Customer( $id : id )
> $locations : Set( size > 5 ) from accumulate(
> CustomerLogin( customerId == $id, $loc : location
)
> over window:time( 30d ),
> collectSet( $loc ) )
> then
> // do something as the customer logged in from more than 5
locations
> in
> the last 30 days
> end
>
> In the previous rule I decided to use sliding windows, just to show
how
> that
> feature can be used to simplify rules, but again, there are several
ways
> of
> doing it.
>
> I strongly recommend you read Drools manual.
>
> http://www.jboss.org/drools/documentation.html
>
> Cheers,
> Edson
>
>
>
> 2009/5/19 Bhushan Bhangale <bhushan_bhangale at kaleconsultants.com>
>
> > Hi,
> >
> >
> >
> > I recently came across Drools. I gone through the documentation and
> the
> > examples provide are quite simple. I want to know if it can be
really
> > applied to complex real world problems.
> >
> >
> >
> > Take for example,
> >
> >
> >
> > If a customer login within 5 minutes from two different locations,
> mark the
> > user invalid.
> >
> > How can I write the above rule in drools? I have the data when the
> user
> > last logged in and the data of current login. You can say two
objects.
> >
> >
> >
> > May be my understanding is wrong but looks like based on rule I have
> to
> > pass all the required data. How can then at real time new rules can
be
> > added?
> >
> >
> >
> > For example,
> >
> >
> >
> > If the customer location is not on a list of valid locations, mark
the
> user
> > invalid.
> >
> >
> >
> > For the above rule I need to pass a list of valid locations as well.
> >
> >
> >
> > Now how about "Customer login from more than 5 locations in the last
> one
> > month"?
> >
> >
> >
> > Thanks
> >
> > *Mr. Bhangale Bhushan*
> > *Associate Manager*
> > *Kale Consultants Ltd.*
> > bhushan_bhangale at kaleconsultants.com
> > tel: +91 (0)206 608
>
3777<http://www.plaxo.com/click_to_call?lang=en&src=jj_signature&To=%2B9
>
1+%280%29206+608+3777&Email=bhushan_bhangale at kaleconsultants.com<http://
www.plaxo.com/click_to_call?lang=en&src=jj_signature&To=%2B9%0A1+%280%29
206+608+3777&Email=bhushan_bhangale at kaleconsultants.com>
> >
> > http://www.kaleconsultants.com
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Disclaimer: This email (including any attachments) is intended for
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> > ----------
> >
> >
> >
> >
> >
> > _______________________________________________
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> > rules-users at lists.jboss.org
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>
>
> --
> Edson Tirelli
> JBoss Drools Core Development
> JBoss, a division of Red Hat @ www.jboss.com
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Message: 2
Date: Thu, 21 May 2009 10:42:34 -0700 (PDT)
From: Steinar Haugen <steinar.haugen at gmail.com>
Subject: [rules-users] RuleBase.removeRule leads to
NoClassDefFoundError
To: rules-users at lists.jboss.org
Message-ID: <23657476.post at talk.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi,
We're having a problem with runtime rule administration; i.e. using
RuleBase.addRule and RuleBase.removeRule.
We're using Drools 4.0.7 on Sun JDK 1.4.2_11 and inside Weblogic 8.1 sp
6.
Typically we remove a few rules followed by adding a few rules. In some
cases, we receive a NoClassDefFoundError. Stacktrace is provided in
attached
file.
http://www.nabble.com/file/p23657476/stacktrace.txt stacktrace.txt
The class referenced (i.e. the one not found) is the removed rule.
Has anyone else seen this behaviour?
This seems like such a basic error that we're wondering if we're doing
something wrong here. We have been unable to find anything about this
To make matters worse, this actually leads to a deadlock. This is
because
lock / unlock in version 4.0.7 is not encapsuled in a try / finally
block in
AbstractRuleBase.removeRule(), so whenever an error occurs, the lock is
not
released.
I found a Jira issue regarding this, where this issue is addressed and
apparently fixed in an earlier version:
https://jira.jboss.org:8443/jira/browse/JBRULES-603
This fix has been rolled back, however, so this issue is present in
version
4.0.7.
We found a workaround for the deadlock by performing lock / unlock
ourselves, since drools will not lock if it has been performed already.
In addition, we encapsulate rulebase access with a read/write lock to
ensure
that whenever the rulebase is updated, no other operation towards it is
performed.
Regards,
Steinar Haugen
--
View this message in context:
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------------------------------
Message: 3
Date: Thu, 21 May 2009 23:57:51 +0200
From: Femke De Backere <femmyke at gmail.com>
Subject: [rules-users] [users-rules] Loading time ruleflow
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID: <D4A555A5-AB32-404C-923B-B70C3EFB9892 at gmail.com>
Content-Type: text/plain; charset="us-ascii"
Hi!
I'm testing the loading time of the line:
kbuilder.add(ResourceFactory.newClassPathResource("nodesflow.rf",
DroolsTest.class), ResourceType.DRF ); for a rule flow file with 1
split node, 3 split nodes, 7 split nodes, ...
But the results I already have are confusing:
1 split node
26071960,8
1
3 split nodes
1018762000
40, 85676594 times the time of 1 split node flow
7 split nodes
4974479,4
1,907968479 times the time of 1 split node flow
Can anybody explain why the 3 split node rule flow file takes a lot
longer than the 7 split rule flow file?
Thx,
Femke
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