/**
* Constructs the factory object.
*
* @param \Drupal\Core\Site\Settings $settings
* An object with site settings.
*
* @throws \Drupal\memcache_storage\DrupalMemcachedInitializeException
*/
public function __construct(Settings $settings)
{
// Validate pecl extension configuration.
$this->extension = DrupalMemcachedUtils::getPeclExtension();
if (!class_exists($this->extension) || !in_array($this->extension, ['Memcache', 'Memcached'])) {
throw new DrupalMemcachedInitializeException('Could not initialize ' . $this->extension . ' PECL extension');
}
// Keep memcache_storage settings.
$this->settings = $settings->get('memcache_storage', []);
// Get configuration of cache bins per memcached clusters.
if (!empty($this->settings['bins_clusters'])) {
$this->bins_clusters = $this->settings['bins_clusters'];
}
}
/**
* {@inheritdoc}
*/
public function addServers($servers)
{
// If server list is empty, then something is configured wrong.
if (empty($servers)) {
DrupalMemcachedUtils::log(LogLevel::ERROR, 'Could not find servers for the cluster %cluster.', ['%cluster' => $this->cluster]);
return FALSE;
}
// Add each server to pecl memcache(d) object. Point your attention that
// addServer() method first calls method from DrupalMemcache(d) class.
foreach ($servers as $server) {
list($host, $port) = DrupalMemcachedUtils::parseServerInfo($server);
$this->addServer($host, $port);
}
// Get information about connected memcached servers.
$stats = $this->getStats();
$failed_connections = [];
foreach ($stats as $server => $server_stats) {
// If uptime info is empty - then this server is not available.
if (empty($server_stats['uptime'])) {
$failed_connections[] = $server;
DrupalMemcachedUtils::log(LogLevel::WARNING, 'Could not connect to the server %server.', ['%server' => $server]);
}
}
// If memcached is unable to connect to all servers it means that
// we have no connections at all, and could not start memcached connection.
if (sizeof($failed_connections) == sizeof($stats)) {
DrupalMemcachedUtils::log(LogLevel::ERROR, 'Could not connect to all servers from the cluster %cluster.', ['%cluster' => $this->cluster]);
return FALSE;
}
// Successfully connected to all servers, yay!
return TRUE;
}
