[rules-users] Inter-fact comparison

[David Sinclair]

take a look at section
4.8.2.10.1. Accumulate Functionsof the drools expert doc

http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-expert/html_single/index.html

2010/6/23 Earnest Dyke <earniedyke at yahoo.com>

> 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 at yahoo.com>
>
> *To:* Rules Users List <rules-users at 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 at yahoo.com>* wrote:
>
>
> From: Earnest Dyke <earniedyke at yahoo.com>
> Subject: Re: [rules-users] Inter-fact comparison
> To: "Rules Users List" <rules-users at 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 at chariotsolutions.com>
> *To:* Rules Users List <rules-users at 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 at 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 at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
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