/**
* {@inheritdoc}
*/
public function isEnabled(SignalInterface $signal) : bool
{
$signo = $signal->getSignal();
return isset($this->signals[$signo]) && $this->signals[$signo]->contains($signal);
}
/**
* {@inheritdoc}
*/
public function reference(SignalInterface $signal)
{
$signo = $signal->getSignal();
if ($this->signals[$signo]->contains($signal)) {
$this->referenced->attach($signal);
}
}