oop2w5/Blackboard.cpp


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#include <algorithm>

#include "Blackboard.h"

using std::max;
using std::lock_guard;

Blackboard::Blackboard() {
	_bbs = new BlackboardStrategy();
}

Blackboard::~Blackboard() {
	delete _bbs;
}

void Blackboard::run() {
	_subthreads[0] = new thread([this] { spawn_subthreads(0, 3); }); // 1, 2, 3
	_subthreads[1] = new thread([this] { spawn_subthreads(3, 3); }); // 4, 5, 6

	_subthreads[0]->join();
	_subthreads[1]->join();

	_bbs->setBestResult(max(_results[0], _results[1]));
}

void Blackboard::spawn_subthreads(unsigned start_index, unsigned length) {
	unsigned end_index = start_index + length;
	// bereken geschiktheid strategie
	for (unsigned i = start_index; i < end_index; i++)
		_subsubthreads[i] = new thread([this, i] { _fitness[i] = (_bbs->*fitnessStrategies[i])(); });

	// join alles
	for (unsigned i = start_index; i < end_index; i++)
		_subsubthreads[i]->join();


	// beslis beste strategie (lelijk linear zoeken want maar 3 elementen)
	lock_guard<mutex>* bbs_lock = new lock_guard<mutex>(_bbs_lock); // lock guard
	_bbs->setBestStrategy(_fitness[start_index]); // beste fitness altijd in _fitness
	for (unsigned i = start_index; i < end_index; i++)
		_bbs->setBestStrategy(max(_fitness[i], _bbs->getBestStrategy()));
	unsigned best_index = start_index;
	for (unsigned i = start_index; i < end_index; i++)
		if (_fitness[i] == _bbs->getBestStrategy()) { best_index = i; break; }
	delete bbs_lock; // handmatig mutex vrijgeven (want volgende regel code duurt lang)

	_results.push_back((_bbs->*resultStrategies[best_index])());
}