public function acquire()
    {
        $acquired = false;        try {
            $this->connection->table($this->table)->insert([
                'key' => $this->name,
                'owner' => $this->owner,
                'expiration' => $this->expiresAt(),
            ]);            $acquired = true;
        } catch (QueryException $e) {
            $updated = $this->connection->table($this->table)
                ->where('key', $this->name)
                ->where(function ($query) {
                    return $query->where('owner', $this->owner)->orWhere('expiration', '<=', time());
                })->update([
                    'owner' => $this->owner,
                    'expiration' => $this->expiresAt(),
                ]);            $acquired = $updated >= 1;
        }        if (random_int(1, $this->lottery[1]) <= $this->lottery[0]) {
            $this->connection->table($this->table)->where('expiration', '<=', time())->delete();
        }        return $acquired;
    }