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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Matches performs a regex comparison which is likely to be more expensive to perform.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Either of the following may (or may not) improve performance.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Use a single matches, eg String(this matches “TextString1|TextString2|TestString3”)), this would at least make it a single operation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Also have you tried just using ==, eg</span>
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">exists( String(this == "TestString1") || String(this == "TestString2") || String(this == "TestString3") from DclassesList)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">You may also want to consider whether it would be beneficial to restructure your fact class to get rid of the from, and match against ClassName facts instead
– this may give you a big performance gain as it means each rule wouldn’t have to iterate over the list, if you are updating MyContext then this gain is likely to be even bigger.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thomas<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:
"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;
font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Kumar Pandey<br>
<b>Sent:</b> 29 September 2010 15:17<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> [rules-users] Matching strings in two arrays<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Drools 5.1.0<o:p></o:p></p>
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<p class="MsoNormal">I have a need to match list of incoming strings to those in the rule. All the strings in the fact object needs to exists in the rule.<o:p></o:p></p>
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<p class="MsoNormal">I have a large set of rules around 5000.<o:p></o:p></p>
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<p class="MsoNormal">In general I have around 4 conditions per rule and its taking in average around 30- ~40 ms to go through the 5000 rules. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">However the following construct that I am using to match the incoming set of input strings is adding on the average 200ms to rules execution.<o:p></o:p></p>
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<p class="MsoNormal">Is there a more efficient way to do this?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">MyContext is the fact class and classes is array of String.<o:p></o:p></p>
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<p class="MsoNormal">I need to make sure that the classes array contains all three strings TestString1, TestString2 and TestString3.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">MyContext(DclassesList : classes)<o:p></o:p></p>
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<p class="MsoNormal">exists( String(this matches "TestString1") || String(this matches "TestString2") || String(this matches "TestString3") from DclassesList)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Of course each rule in the 5000 can have diff set of strings to match.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks<o:p></o:p></p>
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