<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:宋体;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:宋体;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"\@宋体";
panose-1:2 1 6 0 3 1 1 1 1 1;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
font-size:10.5pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
text-indent:21.0pt;
font-size:10.5pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 90.0pt 72.0pt 90.0pt;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1256090657;
mso-list-type:hybrid;
mso-list-template-ids:-637783966 754194718 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
margin-left:18.0pt;
text-indent:-18.0pt;}
@list l1
{mso-list-id:1341355428;
mso-list-type:hybrid;
mso-list-template-ids:1389685892 1610018152 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l1:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
margin-left:18.0pt;
text-indent:-18.0pt;}
@list l1:level2
{mso-level-tab-stop:72.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level3
{mso-level-tab-stop:108.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level4
{mso-level-tab-stop:144.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level5
{mso-level-tab-stop:180.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level6
{mso-level-tab-stop:216.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level7
{mso-level-tab-stop:252.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level8
{mso-level-tab-stop:288.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
@list l1:level9
{mso-level-tab-stop:324.0pt;
mso-level-number-position:left;
text-indent:-18.0pt;}
ol
{margin-bottom:0cm;}
ul
{margin-bottom:0cm;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
<div class=WordSection1>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Any question is also
about performance consideration. See below example:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Rule “1”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> Dialect
“mvel”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> Salience
300<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> No-loop
true<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> When<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> $acctsrc:
data(sourceid==1)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> $reposrc:
data((sourceid==2||sourceid==5)&&amount==acctsrc.amount)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> Then<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> …<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'> End<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Two questions here:<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=EN-US
style='color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>In this
kind of join conditions, is there any best practice to follow in the rule? I
heard from somebody that I need to put data who have less # of transactions
first in my when expression. For example, if I have less number of $reposrc
transactions in facts, I should put it ahead of $acctsrc to gain better
performance. Is this valid?<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=EN-US
style='color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US style='color:#1F497D'>Do we
know how to create an event listener in the rule for logging purpose rather
than standard log4j? It was recommended in some other articles as well. Is this
also valid? (<a
href="http://www.technologyblue.com/docs/presentations/DroolsBestPractices.pdf">http://www.technologyblue.com/docs/presentations/DroolsBestPractices.pdf</a>);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Ultimately, is there
any place I can find a best practice of rule development as a generic guide?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Best<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Abe<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal align=left style='text-align:left'><b><span
style='font-size:10.0pt;font-family:宋体'>发件人<span lang=EN-US>:</span></span></b><span
lang=EN-US style='font-size:10.0pt;font-family:宋体'> Zhuo Li
[mailto:milanello1998@gmail.com] <br>
</span><b><span style='font-size:10.0pt;font-family:宋体'>发送时间<span lang=EN-US>:</span></span></b><span
lang=EN-US style='font-size:10.0pt;font-family:宋体'> 2011</span><span
style='font-size:10.0pt;font-family:宋体'>年<span lang=EN-US>12</span>月<span
lang=EN-US>26</span>日<span lang=EN-US> 16:51<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> Performance
consideration in rule writing<o:p></o:p></span></span></p>
</div>
</div>
<p class=MsoNormal align=left style='text-align:left'><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Hi, team,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I have some quick questions here regarding
performance best practices of rule writing. See below two pieces of rules:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Rule “1”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
Salience 100<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
No-loop true<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
When $txn : data(sourceid == 5&&txnjustify==”995”&&eval(creditOption($txn)==1)&&eval(isGCSwitch($txn))&&isCurrencyEquals($txn)==0&&compareToPostThreshold($txn)==2);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
Then<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
End<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Rule “2”<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
Salience 100<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
No-loop true<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
When $txn : data(sourceid ==
5&&txnjustify==”995”&&eval(creditOption($txn)==1)&&eval(isGCSwitch($txn))&&isCurrencyEquals($txn)==0&&compareToPostThreshold($txn)==1);<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
Then<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
…<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>
End<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Questions:<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l1 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>Will I gain better performance
if I put the rule differentiator condition “compareToPostThreshold($txn)==2” at
the beginning of both rule 1 and 2? <o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l1 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>I saw salaboy’s video claiming
that to avoid using eval() in the rule. Do we have any alternative way to do
that from a performance consideration or I’d better collect/ prepare all the
data before I send them into the session?<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:18.0pt;text-indent:-18.0pt;
mso-list:l1 level1 lfo2'><![if !supportLists]><span lang=EN-US><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US>What’s you guys’ naming
convention for rule’s salience?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>PS: my Drools version is 5.2.0.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Best regards<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Abe<o:p></o:p></span></p>
</div>
</body>
</html>