In my opinion, for 300 drl files, the better is to use a specific KB for
each DRL (or some KAgent).
This way you don't have to pollute your rules with control facts (and
you can eventually re-use some part of DRL files into multiple context
KB), and the RETE is tightened to the strict minimum (no eval of useless
constraints).
Moreover, I am not sure if drools compiler can really handle some
removal or addition of rules dynamically in a existing KB without having
to recompile all rules (so keeping up-to-date a big KB can be costly).
If you (still) want to use your solution 1 (ie control facts), you can
also use rule inheritance (which make a rule inherit the conditions of
another "parent" rule, and the parent rule will contain the check on the
control fact) :
rule context-rule
enabled false // this rule won't fire by itself
when
Context(task = "bar")
then
// not used anyway
end
rule X extends context-rule
when
// specific conditions
then
// fired when specific conditions AND context-rule's conditions
are met
end
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