public function log($level, $message, array $context = array())
    {
        $logger = new \Monolog\Logger('audit');
        try {
            $handler = new \Monolog\Handler\MongoDBHandler(
                new \Mongo($this->getConnectString()),
                $this->getDbName(),
                $this->getDbCollection()
            );
        } catch (\MongoConnectionException $e) {
            throw new \Exception('Cannot connect to Mongo - please check your server');
        }
        $logger->pushHandler($handler);
        $logger->pushProcessor(function ($record) {
            $record['datetime'] = $record['datetime']->format('U');
            return $record;
        });

        return $logger->$level($message, $context);
    }