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<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi, Laun,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I might be dull but what does this indicate? Drools did OPTIMIZE
MVEL dialect? But call it twice means optimization?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Best<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Abe<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.5pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:SimSun'>发件人<span
lang=EN-US>:</span></span></b><span lang=EN-US style='font-size:10.0pt;
font-family:SimSun'> rules-users-bounces@lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] </span><b><span style='font-size:
10.0pt;font-family:SimSun'>代表 </span></b><span lang=EN-US
style='font-size:10.0pt;font-family:SimSun'>Wolfgang Laun<br>
</span><b><span style='font-size:10.0pt;font-family:SimSun'>发送时间<span
lang=EN-US>:</span></span></b><span lang=EN-US style='font-size:10.0pt;
font-family:SimSun'> 2012</span><span style='font-size:10.0pt;font-family:SimSun'>年<span
lang=EN-US>1</span>月<span lang=EN-US>5</span>日<span lang=EN-US>
16:53<br>
</span><b>收件人<span lang=EN-US>:</span></b><span
lang=EN-US> Rules Users List<br>
</span><b>主题<span lang=EN-US>:</span></b><span lang=EN-US>
[rules-users] MVEL performance penalty<o:p></o:p></span></span></p>
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<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US>Drools 5.3.0
FINAL.<br>
<br>
This experiment was inspired by code posted with the insinuation that MVEL
would "optimize" condition evaluation. - Consider this rule:<br>
<br>
rule "Term - java"<br>
dialect "java"<br>
when<br>
$ea : EasyApp( Test.valueInList( $ea.getProductCode(), "CAR"
)==true<br>
&& age
< 0 )<br>
then end<br>
<br>
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:<br>
<br>
rule "Term - mvel"<br>
dialect "mvel"<br>
when<br>
$ea : EasyApp( Test.valueInList( productCode, "CAR"
)==true<br>
&&
age < 0 )<br>
then end<br>
<br>
<b><i>Now Test.valueInList() is called twice for each inserted fact.</i></b><br>
<br>
Cheers<br>
Wolfgang<br>
<br>
<o:p></o:p></span></p>
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