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<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>Hello
everyone,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>I’ve
got a question. I’m using drools-guvnor to execute some rule-scenarios. I
have to solve the following problem: I have an amount of objects in my working
memory and can’t remove objects from the working memory in the then-part
of the rule. I want to combine two rules, the first rule selects some objects
and the second rule checks only these selected objects for additional criteria.
I have to use two rules, because I want to report the objects selected in the
first rule, too. Now I have implemented this with two rules and in the second
rule, the criterias of the first rule are copied to the second rule, my
question is, is there a way to get rid of this redundandance?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>I
have tried this with a rule flow, but the problem is, this always works on the
whole working memory, but I can’t remove the not used objects from
working memory for performance reasons. Is there another way to solve this
problem?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>Here
is an example for what I intend to do:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>Rule1:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>when<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'> customer:Customer(town=="London")<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>then<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'> System.out.println(customer.getLname()
+ " is inhabitant of London");<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>Rule2:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>when<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'> customer:Customer(town=="London",job=="TEACHER")<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>then<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'> System.out.println(customer.getLname()
+ " is a teacher");<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>This
example illustrates, with the first rule I want to get to know, how many
customers are from London and in the second rule I want to know, how many of
the London customers are teachers. I want to create a kind of statistics. I
have quite a lot of conditions for the first rule, so I don’t want to
have them redundantly.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Arial","sans-serif"'>Greetings,
Dominik<o:p></o:p></span></p>
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