Hi!
I would put the creation of the key into a getter of my dataobject like:
class MyObject {
public String getMatchingKey() {
return doubleMetahone(myValue);
}
}
then insert this object into the working memory. You can write then your
rules like:
$a : MyObject ()
$b: MyObject(MatchingKey == $a.MatchingKey)
Drools calls the getMatchingKey only once and caches the result!
You can hide any kind of processing in a getter. As example I've done many
Date/Time processing like this.
juergen
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