public function isFrozen(): bool
    {
        if (null === $this->frozen) {
            $this->frozen = $this->redis->exists($this->buildKey('frozen'));
        }

        return $this->frozen;
    }
public function isFrozen(): bool
    {
        if (null === $this->frozen) {
            $this->frozen = $this->redis->exists($this->buildKey('frozen'));
        }

        return $this->frozen;
    }
public function isFrozen ( ) : bool { if ( null === $ this -> frozen ) { $ this -> frozen = $ this -> redis -> exists ( $ this -> buildKey ( 'frozen' ) ) ; } return $ this -> frozen ; }
Tells if this backend is frozen.

@return boolean
Tells if this backend is frozen .