Re: [rules-users] Detecting two instances of the same eventwithFusion Rules

You can solve this if you are able to put an ordering on the Things. Eg you could have $that : Thing(...) $other : Thing(this != $that, name > $that.name) This assumes that names are unique. Thomas From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Georg Maier Sent: 26 May 2010 12:27 To: Rules Users List Subject: Re: [rules-users] Detecting two instances of the same eventwithFusion Rules Hi, thanks for the reply. You are right, it's just not working the otherway round, if there would be no "not" $that : Thing(..) $other : Thing ( this != $that , ...) would match always twice. For example, if there were two "Thing"'s A and B it would match for the combination AB as well as BA... I know this was actually not my question, but I guess it was the reason I got confused :) Thanks again! Von: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] Im Auftrag von Wolfgang Laun Gesendet: Mittwoch, 26. Mai 2010 10:01 An: Rules Users List Betreff: Re: [rules-users] Detecting two instances of the same event withFusion Rules But $that : Thing(...) Thing( this != $that,...) is the standard way of ensuring that a pattern matches two distinct objects of the same class, and there is no reason why you shouldn't be able to use it with not as well: $that : Thing(...) not ( Thing( this != $that,... ) ) "Given one Thing (with constraints...) and *not* having any *other* Thing (with constraints...), then..." -W 2010/5/26 Georg Maier <Georg.Maier@cjt.de<mailto:Georg.Maier@cjt.de>> Hi, I'm new to Drools and currently trying to implement some examples using CEP / Fusion. I got stuck on a problem to which I can't find any solution in the online documentation, so I'm hoping for your help. I'm trying to write a rule, which is activated whenever a certain event occurs and no event of the same type occurred in the e.g. last 5 minutes (or just at the same time). I know how to do it if these are events of different types, but I can't find any way for events of the same type. What I tried is something like that: $error : RouterErrorEvent ( $name : routerName ) from entry-point "abc" not ($otherError : RouterErrorEvent ( (this coincides $error) && (routerName == $name) ) from entry-point "abc") First of all there's the problem, that $error and $otherError will be the same instance if a "RouterEventError" has been inserted from the "abc" entry point. Adding a (this != $error) to the second, ($otherError) obviously is no solution to that as well. If it were two different events something like in example 2.19 would work: $error1 : ErrorOneEvent( $id : id ) not ($error2 : ErrorTwoEvent( id == $id, this coincides $error1 )) I'm kinda sure I'm missing something pretty "easy" here... or is this approach completely wrong? As I'm aware of the fact that I couldn't be more of a newbie :) I would appreciate any suggestions for nice tutorials or further reading as well! Thanks in advance! Georg _______________________________________________ rules-users mailing list rules-users@lists.jboss.org<mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users ________________________________ ************************************************************************************** This message is confidential and intended only for the addressee. If you have received this message in error, please immediately notify the postmaster(a)nds.com and delete it from your system as well as any copies. The content of e-mails as well as traffic data may be monitored by NDS for employment and security purposes. To protect the environment please do not print this e-mail unless necessary. NDS Limited. Registered Office: One London Road, Staines, Middlesex, TW18 4EX, United Kingdom. A company registered in England and Wales. Registered no. 3080780. VAT no. GB 603 8808 40-00 **************************************************************************************