static function treeSearchApproachBackEnd(&$placements, &$nvms, &$maxVM, &$level = 0, &$usageVector = array(), &$stateCounter = 0)
{
//Interects foreach possible placements of that VM
foreach ($placements[$level] as $p) {
$pmName = explode(':', $p)[1];
//Checks if the PM is not full
if ($usageVector[$pmName] < $maxVM) {
//Check if the last VM to host
if ($level >= $nvms - 1) {
//Just count one state
$stateCounter++;
} else {
//Prepare to drilldown
$level++;
$usageVector[$pmName]++;
Approximation::treeSearchApproachBackEnd($placements, $nvms, $maxVM, $level, $usageVector, $stateCounter);
$level--;
$usageVector[$pmName]--;
}
}
}
return $stateCounter;
}