Improve initial states generation #58
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I've just updated the #PR. Previously we instantiated a new Object[], a new State and a new EvaluationContext for each possible state to be tested. Now we reuse this data structures in order to prevent excessive memory-allocation and gc-ing. |
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* Implement missing standard methods: - PairPredicateInt#negate - Obj*Function#andThen * Add missing comments to functional interfaces
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The explicit engine explores multiple initial states by explicitly building generating a list of all possible states. Actually building the list is very slow and runs out of memory easily. This solution iterates over the cartesion product of the variable domains. It introduces a deciated iterable for the product which generates tuples on the fly. Please note that it requires #flatMap from FunctionalIterator instead of Stream. The latter is broken in the sense that it preallocates memory for the whole result. Thus, we would run out of memory as well.
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As stated in #2, the explicit engine explores multiple initial states by explicitly building generating a list of all possible states. Actually building the list is very slow and runs out of memory easily.
This PR improves the situation by iterating and filtering the set of possible states on the fly instead of building a list. It lays the foundation for further improvements such as analyzing the
init ... endinitstatement before doing the product of the variable domains.