I still have not found a solution to this problem. Nobody has a suggestion? cfili wrote: > Hi, > I have just started using Drools 4.0 and I am very pleased so far. I do > have one question regarding storage of a result from within an eval block. > For example if I have the following eval in my rule: > > eval((value1 /value2) > 0.5) > > Is there a way to store the result of value1/value2 in a temp variable so > that it can be accessed in the "then" part of my rule? I want to avoid > recomputing the result again in the then section. > > Thanks. > >

What I would do in your case is to have 2+ rules. One rule calculates the value, and the other(s) rule(s) will reason over the calculated value. Example: rule "Calculates Memory Usage" when $mpw: Resource( type=="MemoryInfo", attributes.Percent == null, $phys: attributes.PhysicalUsed, $tot: attributes.TotalPhysical ) then $mpw.setAttribute( "Percent", ((Double)$phys).doubleValue() / ((Double)$tot).doubleValue()); update( $mpw ); end rule "High Average Usage" when Resource( type=="MemoryInfo", attributes.Percent > .95 ) then // do something end rule "Medium Average Usage" when Resource( type=="MemoryInfo", attributes.Percent > .50 && <= .95 ) then // do something end Hope it helps... []s Edson 2007/8/27, cfili <cfilippelli(a)cerner.com&gt;: > > > Sure... basically using a map called "attributes" to retrieve specific > attributes on a resource. Currently I am simply printing the value from > the > eval, but I would like to be able to store it. > > rule "High Memory 95%" > > when > $mpw : Resource(type == "MemoryInfo", $physUsed : > attributes["PhysicalUsed"], $totalPhys : attributes["TotalPhysical"]) > eval((((Double)$physUsed).doubleValue() / > ((Double)$totalPhys).doubleValue()) > 0.95) > then > System.out.println(" Percent Used: " + > ((Double)$physUsed).doubleValue() / > ((Double)$totalPhys).doubleValue()); > end > -- > View this message in context: > http://www.nabble.com/Storing-temp-results-in-eval-block-tf4225783.html#a... > Sent from the drools - user mailing list archive at Nabble.com. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > -- Edson Tirelli Software Engineer - JBoss Rules Core Developer Office: +55 11 3529-6000 Mobile: +55 11 9287-5646 JBoss, a division of Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users