CriticalError example

    /** * {@inheritDoc} */
    public function initialize()
    {
        try {
            $this->redis = new Client($this->config, ['prefix' => $this->prefix]);
            $this->redis->time();
        } catch (Exception $e) {
            throw new CriticalError('Cache: Predis connection refused (' . $e->getMessage() . ').');
        }
    }

    /** * {@inheritDoc} */
    public function get(string $key)
    {
        $key = static::validateKey($key);

        $data = array_combine(
            [

$this->config['host'],
                    $this->config['port'],
                    $this->config['weight']
                );

                // attempt to get status of servers                 $stats = $this->memcached->getStats();

                // $stats should be an associate array with a key in the format of host:port.                 // If it doesn't have the key, we know the server is not working as expected.                 if (! isset($stats[$this->config['host'] . ':' . $this->config['port']])) {
                    throw new CriticalError('Cache: Memcached connection failed.');
                }
            } elseif (class_exists(Memcache::class)) {
                // Create new instance of Memcache                 $this->memcached = new Memcache();

                // Check if we can connect to the server                 $canConnect = $this->memcached->connect(
                    $this->config['host'],
                    $this->config['port']
                );

                

$this->redis = new Redis();

        try {
            // Note:: If Redis is your primary cache choice, and it is "offline", every page load will end up been delayed by the timeout duration.             // I feel like some sort of temporary flag should be set, to indicate that we think Redis is "offline", allowing us to bypass the timeout for a set period of time.
            if (! $this->redis->connect($config['host'], ($config['host'][0] === '/' ? 0 : $config['port']), $config['timeout'])) {
                // Note:: I'm unsure if log_message() is necessary, however I'm not 100% comfortable removing it.                 log_message('error', 'Cache: Redis connection failed. Check your configuration.');

                throw new CriticalError('Cache: Redis connection failed. Check your configuration.');
            }

            if (isset($config['password']) && ! $this->redis->auth($config['password'])) {
                log_message('error', 'Cache: Redis authentication failed.');

                throw new CriticalError('Cache: Redis authentication failed.');
            }

            if (isset($config['database']) && ! $this->redis->select($config['database'])) {
                log_message('error', 'Cache: Redis select database failed.');