/**
* @param null $type
*
* @return int
* @throws \ObjectivePHP\Primitives\Exception
*/
public function count($type = null)
{
if (is_null($type)) {
$count = parent::count();
} else {
$count = 0;
$this->each(function (MessageInterface $message) use(&$count, $type) {
if ($type == $message->getType()) {
$count++;
}
});
}
return $count;
}