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&gt; *To:* Rules Users List <rules-users(a)lists.jboss.org&gt; *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&gt;* wrote: From: Earnest Dyke <earniedyke(a)yahoo.com&gt; Subject: Re: [rules-users] Inter-fact comparison To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; 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&gt; *To:* Rules Users List <rules-users(a)lists.jboss.org&gt; *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&gt; > 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 > > -----Inline Attachment Follows----- _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users