Re: [rules-users] Does Drools Fusion support "Group By" clause ?

Hi Gabor, Thanks for your response. I looked at this example in the user guide. In this example, there are two Event POJO (Order.java and OrderItem.java) that are injected. The example I quoted initially is slightly different. There is only one Event Pojo (Sale.java). The "type" can be a string or int attribute in Sale.java that can hold any random value. So it is not possible to make it a new Event POJO (Type.java), and insert all possible instances with different possible values. This requirement is for a CEP Engine. I used ESPER, and could achieve this easily using the "group by" clause in the EPL language. Withn DROOLs FUSION, Im not able to do the same. Thanks Kiran -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Gabor Szokoli Sent: Monday, January 03, 2011 5:31 PM To: Rules Users List Subject: Re: [rules-users] Does Drools Fusion support "Group By" clause ? Hi, 2011/1/3 Kiran Ananthpur Bacche (kbacche) <kbacche(a)cisco.com&gt;: for I've never used "accumulate" myself, so I looked it up in the manual, and there's an example that's exactly what you want :-) (just substitute $order with your $type) rule "Apply 10% discount to orders over US$ 100,00" when $order : Order() $total : Number( doubleValue > 100 ) from accumulate( OrderItem( order == $order, $value : value ), sum( $value ) ) then # apply discount to $order end http://downloads.jboss.com/drools/docs/5.1.1.34858.FINAL/drools-expert/h tml_single/index.html#d0e4893 Gabor _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users