public function length($topic, $priority = null)
{
if ($priority === null) {
$length = 0;
/** @noinspection SuspiciousLoopInspection */
foreach ($this->_priorities as $priority) {
$length += $this->redis->lLen($this->_prefix . $topic . ':' . $priority);
}
return $length;
} else {
return $this->redis->lLen($this->_prefix . $topic . ':' . $priority);
}
}