[rules-users] Matching strings in two arrays

[Swindells, Thomas]

Matches performs a regex comparison which is likely to be more expensive to perform.
Either of the following may (or may not) improve performance.
Use a single matches, eg String(this matches "TextString1|TextString2|TestString3")), this would at least make it a single operation.
Also have you tried just using ==, eg exists( String(this == "TestString1") ||  String(this == "TestString2") || String(this ==  "TestString3") from DclassesList)

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.

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Kumar Pandey
Sent: 29 September 2010 15:17
To: rules-users at lists.jboss.org
Subject: [rules-users] Matching strings in two arrays

Drools 5.1.0
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.
I have a large set of rules around 5000.
In general I have around 4 conditions per rule and its taking in average around 30- ~40 ms to go through the 5000 rules.

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.
Is there a more efficient way to do this?

MyContext is the fact class and classes is array of String.
I need to make sure that the classes array contains all three strings TestString1, TestString2 and TestString3.

MyContext(DclassesList : classes)
exists( String(this matches "TestString1") ||  String(this matches "TestString2") || String(this matches "TestString3") from DclassesList)

Of course each rule in the 5000 can have diff set of strings to match.

Thanks

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