private function connect()
{
$this->redis = new \Redis();
$success = $this->redis->connect($this->host, $this->port, $this->timeout, null, 100);
if ($success && !empty($this->password)) {
$success = $this->redis->auth($this->password);
}
if (!empty($this->database) || 0 === $this->database) {
$this->redis->select($this->database);
}
return $success;
}