Compiled template rule ordering
by Patrick Conreaux
Hi,
I am attempting to compile a rule template and expecting the resulting rules
to preserve the ordering of the template and of the rows in the CSV file.
However, it doesn't appear that ordering is preserved. Is this a bug, or is
there a workaround?
I would like to rely on the implicit top-down salience by having rules in a
specified order within the same file. (I'm aware that mutually exclusive
rules are preferred, but this greatly complicates maintaining the rules for
my use case, as does maintaining salience values.)
Using the (slightly-modified) cheese example, this template...
template header
age
type
log
package org.drools.examples.templates;
global java.util.List list;
rule "first rule"
when
eval(true)
then
System.out.println("first rule");
end
template "cheesefans"
rule "Cheese fans_(a){row.rowNumber}"
when
Person(age == @{age})
Cheese(type == "@{type}")
then
list.add("@{log}");
end
end template
rule "last rule"
when
eval(true)
then
System.out.print("last rule");
end
...results in the following output, where the first and last rule appear
at the top followed
by the template rules in *reverse *row order. Any suggestions to achieve
the desired order?
package org.drools.examples.templates;
global java.util.List list;
rule "first rule"
when
eval(true)
then
System.out.println("first rule");
end
rule "last rule"
when
eval(true)
then
System.out.print("last rule");
end
rule "Cheese fans_3"
when
Person(age == Really old guy)
Cheese(type == "65")
then
list.add("provolone");
end
rule "Cheese fans_2"
when
Person(age == Young guy)
Cheese(type == "21")
then
list.add("cheddar");
end
rule "Cheese fans_1"
when
Person(age == Old guy)
Cheese(type == "42")
then
list.add("stilton");
end
Cheers,
Patrick
9 years, 5 months
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