public function check()
{
if ($this->user !== null) {
return $this->user;
}
if (!($code = $this->persistences->check())) {
return false;
}
if (!($user = $this->persistences->findUserByPersistenceCode($code))) {
return false;
}
if (!$this->cycleCheckpoints('check', $user)) {
return false;
}
return $this->user = $user;
}