Cml\Cache\Memcache::__construct PHP Метод

    public function __construct($conf = false)
    {
        $this->conf = $conf ? $conf : Config::get('default_cache');
        if (extension_loaded('Memcached')) {
            $this->memcache = new \Memcached('cml_memcache_pool');
            $this->type = 1;
        } elseif (extension_loaded('Memcache')) {
            $this->memcache = new \Memcache();
            $this->type = 2;
        } else {
            throw new PhpExtendNotInstall(Lang::get('_CACHE_EXTEND_NOT_INSTALL_', 'Memcached/Memcache'));
        }
        if (!$this->memcache) {
            throw new PhpExtendNotInstall(Lang::get('_CACHE_NEW_INSTANCE_ERROR_', 'Memcache'));
        }
        $singleNodeDownFunction = function ($host, $port) {
            //这边挂掉调用此回调在几s内只会调用一次。其它情况使用memcache方法均返回flase不报错
            Plugin::hook('cml.cache_server_down', ['host' => $host, 'port' => $port]);
            Log::emergency('memcache server down', ['downServer' => ['host' => $host, 'port' => $port]]);
        };
        $allNodeDownFunction = function ($serverList) {
            Plugin::hook('cml.cache_server_down', $this->conf['server'], $serverList);
            //全挂
            throw new CacheConnectFailException(Lang::get('_CACHE_CONNECT_FAIL_', 'Memcache', json_encode($serverList)));
        };
        $downServer = 0;
        if ($this->type == 2) {
            //memcache
            foreach ($this->conf['server'] as $val) {
                if (!$this->memcache->addServer($val['host'], $val['port'])) {
                    Log::emergency('memcache server down', ['downServer' => $val]);
                }
            }
            $this->memcache->setFailureCallback($singleNodeDownFunction);
            $serverList = $this->memcache->getextendedstats();
            foreach ($serverList as $server => $status) {
                $status || $downServer++;
            }
            if (count($serverList) <= $downServer) {
                $allNodeDownFunction($serverList);
            }
            return;
        }
        if (md5(json_encode($this->conf['server'])) !== md5(json_encode($this->memcache->getServerList()))) {
            $this->memcache->quit();
            $this->memcache->resetServerList();
            $this->memcache->addServers(array_values($this->conf['server']));
            $this->memcache->setOptions([\Memcached::OPT_PREFIX_KEY => $this->conf['prefix'], \Memcached::OPT_DISTRIBUTION => \Memcached::DISTRIBUTION_CONSISTENT, \Memcached::OPT_LIBKETAMA_COMPATIBLE => true, \Memcached::OPT_SERVER_FAILURE_LIMIT => 1, \Memcached::OPT_RETRY_TIMEOUT => 30, \Memcached::OPT_AUTO_EJECT_HOSTS => true, \Memcached::OPT_REMOVE_FAILED_SERVERS => true]);
            \Memcached::HAVE_JSON && $this->memcache->setOption(\Memcached::OPT_SERIALIZER, \Memcached::SERIALIZER_JSON_ARRAY);
        }
        $serverStatus = $this->memcache->getStats();
        foreach ($serverStatus as $server => $status) {
            if ($status['pid'] < 1) {
                $downServer++;
                $server = explode(':', $server);
                $singleNodeDownFunction($server[0], $server[1]);
            }
        }
        if (count($serverStatus) <= $downServer) {
            $allNodeDownFunction($serverStatus);
        }
    }