[jboss-jira] [JBoss JIRA] Updated: (JBRULES-1471) Accumulate should not call getResult() more then necessary

Accumulate should not call getResult() more then necessary ---------------------------------------------------------- Key: JBRULES-1471 URL: https://issues.jboss.org/browse/JBRULES-1471 Project: Drools Issue Type: Task Security Level: Public(Everyone can see) Components: drools-core (expert) Reporter: Geoffrey De Smet Assignee: Edson Tirelli Fix For: 5.3.0.CR1 For this rule: rule "roomCapacityTooSmall" // TODO it takes 50-90% of the performance of drools-solver when $period : Period(); $room : Room($capacity : capacity); $totalStudentSize : Number(intValue > $capacity) from accumulate( Exam(period == $period, room == $room, $studentSize : topicStudentSize), sum($studentSize) ); ... end Outside drl, I update 2 out of 700 Exam objects and call fireAllRulesAndCalculateDecisionScore. The drl never changes an Exam. Period and Room never change. That results into this log: Breakpoint reached at org.drools.solver.core.evaluation.EvaluationHandler.fireAllRulesAndCalculateDecisionScore(EvaluationHandler.java:90) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.reverse(SumAccumulateFunction.java:62) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.accumulate(SumAccumulateFunction.java:53) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.reverse(SumAccumulateFunction.java:62) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.accumulate(SumAccumulateFunction.java:53) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.reverse(SumAccumulateFunction.java:62) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.accumulate(SumAccumulateFunction.java:53) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.reverse(SumAccumulateFunction.java:62) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.accumulate(SumAccumulateFunction.java:53) Breakpoint reached at org.drools.base.accumulators.SumAccumulateFunction.getResult(SumAccumulateFunction.java:70) There are 4 accumulate calls and 4 reverse calls. That might be accurate. There are 8 getResult calls, that should only be 1. Also, the getResult method creates a new Double instance each time: return new Double( data.total ); It might be better to do return Double.valueOf(data.total); to allow the JVM to hot spot optimize it.