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6.3. Architecture Overview
Planner is the first framework to combine optimization algorithms (metaheuristics, ...) with score calculation by a rule engine (such as Drools Expert). This combination turns out to be a very efficient, because:
- A rule engine such as Drools Expert is great for calculating the score of a solution of a planning problem. It makes it easy and scalable to add additional soft or hard constraints such as "a teacher shouldn't teach more then 7 hours a day". It does delta based score calculation without any extra code. However it tends to be not suitable to actually find new solutions.
- An optimization algorithm is great at finding new improving solutions for a planning problem, without necessarily brute-forcing every possibility. However it needs to know the score of a solution and offers no support in calculating that score efficiently.
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