Re: [rules-users] Inter-fact comparison
Greg,
Thanks for the example. This should do what I need. Can you point me to some documentation
on how to create custom operators?
Earnie!
________________________________
From: Greg Barton <greg_barton(a)yahoo.com>
To: Rules Users List <rules-users(a)lists.jboss.org>
Sent: Tue, June 22, 2010 4:29:50 PM
Subject: Re: [rules-users] Inter-fact comparison
A regular old accumulate could do this. Doesn't even have to be custom:
rule "many bogus attempts"
when
$login : Login( $baseName : name)
$total : Number( intValue > 5 )
from accumulate( Login( this != login, eval(levenshtein(name, baseName) ),
init( int total = 0; ),
action( total++; ),
reverse( total--; ),
result( total ) )
then
//ALARM!
end
This basically says "accumulate all Logins where the name is within a levenshtein
distance of a given Login and freak out if there's more than X."
This rule isn't all fusiony, but you get the idea. Also, the eval in the accumulate
could be a custom operator for readability.
--- On Tue, 6/22/10, Earnest Dyke <earniedyke(a)yahoo.com> wrote:
From: Earnest Dyke <earniedyke(a)yahoo.com>
Subject: Re: [rules-users] Inter-fact comparison
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Date: Tuesday, June 22, 2010, 2:57 PM
Thanks for the quick reply.
Yes, the original facts are already coming in via a stream (Fusion) to an existing set of
rules so I was hoping to build on that. What I am trying to do is evaluate logins
information as users are attempting to login trying to identify hack attempts by a person
trying to login with a slightly different user name over a given period of time.
Earnie!
________________________________
From: David Sinclair <dsinclair(a)chariotsolutions.com>
To: Rules Users List
<rules-users(a)lists.jboss.org>
Sent: Tue, June 22, 2010 3:47:36 PM
Subject: Re: [rules-users] Inter-fact comparison
>Hi Earnie,
What you are explaining seems pretty straight forward and would more likely than not be
overkill to use a rule engine. Are there other aspects of the system you are leaving out
that warrant the use of Drools?
dave
2010/6/22 Earnest Dyke <earniedyke(a)yahoo.com>
Greetings all,
>
>I have a requirement to compare a set of facts against each other, calculate a value
that indicates the amount of difference (Levenshtein distance) between a single attribute
on each fact. So I load all of my facts into working memory then what? Do I execute a rule
first that creates a new set of facts which is a Cartesian product of the original set of
facts, each new fact containing a reference to two original facts and the diff between
them? Looked at using a custom accumulate function but I don't think that's going
to do what I need since it is intended to go through a set of facts and return a single
value.
>
>Any and all related help is appreciated.
>
>Earnie!
>
>_______________________________________________
>>>rules-users mailing list
>rules-users(a)lists.jboss.org
>https://lists.jboss.org/mailman/listinfo/rules-users
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>
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