[rules-users] 答复: MVEL performance penalty

Hi, Laun, I might be dull but what does this indicate? Drools did OPTIMIZE MVEL dialect? But call it twice means optimization? Best Abe 发件人: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] 代表 Wolfgang Laun 发送时间: 2012年1月5日 16:53 收件人: Rules Users List 主题: [rules-users] MVEL performance penalty Drools 5.3.0 FINAL. This experiment was inspired by code posted with the insinuation that MVEL would "optimize" condition evaluation. - Consider this rule: rule "Term - java" dialect "java" when $ea : EasyApp( Test.valueInList( $ea.getProductCode(), "CAR" )==true && age < 0 ) then end You'd expect that Test.valueInList() is called once per inserted EasyApp fact, and this can be verified easily. - Now the same rule, with MVEL's syntactic sugar: rule "Term - mvel" dialect "mvel" when $ea : EasyApp( Test.valueInList( productCode, "CAR" )==true && age < 0 ) then end Now Test.valueInList() is called twice for each inserted fact. Cheers Wolfgang