[rules-users] having counter in drl

[techy]

Hello,
I would like to take 100 sampling facts for rule and persist it in the db
and ignore other data.
How Can I maintain the counter? as global variable? Please clarify with
sample code.
I tried following way and but it does not work as expected.

Ex:
global Integer counter;
rule "get sampling data"
   when fact : Foo(some condition) && eval(counter <= 100)
   then
    counter++
   // do some condition
end
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