/**
* Settings the memcached instance
*
* @throws CacheException when the Memcached extension is not built with the desired serializer engine
* @return void
*/
protected function _setOptions() {
$this->_Memcached->setOption(Memcached::OPT_LIBKETAMA_COMPATIBLE, true);
$serializer = strtolower($this->settings['serialize']);
if (!isset($this->_serializers[$serializer])) {
throw new CacheException(
__d('cake_dev', '%s is not a valid serializer engine for Memcached', $serializer)
);
}
if ($serializer !== 'php' && !constant('Memcached::HAVE_' . strtoupper($serializer))) {
throw new CacheException(
__d('cake_dev', 'Memcached extension is not compiled with %s support', $serializer)
);
}
$this->_Memcached->setOption(Memcached::OPT_SERIALIZER, $this->_serializers[$serializer]);
// Check for Amazon ElastiCache instance
if (defined('Memcached::OPT_CLIENT_MODE') && defined('Memcached::DYNAMIC_CLIENT_MODE')) {
$this->_Memcached->setOption(Memcached::OPT_CLIENT_MODE, Memcached::DYNAMIC_CLIENT_MODE);
}
$this->_Memcached->setOption(Memcached::OPT_COMPRESSION, (bool)$this->settings['compress']);
}
/**
* Initializes the identifier prefix
*
* @return void
* @throws Exception
*/
public function initializeObject()
{
if (empty($this->servers)) {
throw new Exception('No servers were given to Memcache', 1213115903);
}
$memcachedPlugin = '\\' . ucfirst($this->usedPeclModule);
$this->memcache = new $memcachedPlugin();
$defaultPort = $this->usedPeclModule === 'memcache' ? ini_get('memcache.default_port') : 11211;
foreach ($this->servers as $server) {
if (substr($server, 0, 7) === 'unix://') {
$host = $server;
$port = 0;
} else {
if (substr($server, 0, 6) === 'tcp://') {
$server = substr($server, 6);
}
if (strpos($server, ':') !== false) {
list($host, $port) = explode(':', $server, 2);
} else {
$host = $server;
$port = $defaultPort;
}
}
$this->memcache->addserver($host, $port);
}
if ($this->usedPeclModule === 'memcached') {
$this->memcache->setOption(\Memcached::OPT_COMPRESSION, $this->getCompression());
}
}
/**
* set consistent-hash
* 每次set会自动摘除问题服务器；每次get，前两次失败后，会成功查出问题服务器
* @param void
* @return void
*/
protected function _setOption($switch)
{
if ($this->_memcache && $switch) {
$this->_memcache->setOption(Memcached::OPT_DISTRIBUTION, Memcached::DISTRIBUTION_CONSISTENT);
$this->_memcache->setOption(Memcached::OPT_LIBKETAMA_COMPATIBLE, true);
$this->_memcache->setOption(Memcached::OPT_REMOVE_FAILED_SERVERS, true);
}
}
/**
* Settings the memcached instance
*
*/
protected function _setOptions()
{
$this->_Memcached->setOption(Memcached::OPT_LIBKETAMA_COMPATIBLE, true);
$this->_Memcached->setOption(Memcached::OPT_BINARY_PROTOCOL, true);
if (Memcached::HAVE_IGBINARY) {
$this->_Memcached->setOption(Memcached::OPT_SERIALIZER, Memcached::SERIALIZER_IGBINARY);
}
$this->_Memcached->setOption(Memcached::OPT_COMPRESSION, (bool) $this->settings['compress']);
}
/**
* Setter for compression flags bit
*
* @param boolean $useCompression
* @return void
* @api
*/
protected function setCompression($useCompression)
{
if ($this->memcache instanceof \Memcached) {
$this->memcache->setOption(\Memcached::OPT_COMPRESSION, $useCompression);
} else {
if ($useCompression === true) {
$this->flags ^= MEMCACHE_COMPRESSED;
} else {
$this->flags &= ~MEMCACHE_COMPRESSED;
}
}
}
/**
* Initializes
*/
private function initialize($config)
{
if (empty($config['servers'])) {
return false;
}
if (defined('\\Memcached::OPT_REMOVE_FAILED_SERVERS')) {
$this->_memcache->setOption(\Memcached::OPT_REMOVE_FAILED_SERVERS, true);
}
if (isset($config['aws_autodiscovery']) && $config['aws_autodiscovery'] && defined('\\Memcached::OPT_CLIENT_MODE') && defined('\\Memcached::DYNAMIC_CLIENT_MODE')) {
$this->_memcache->setOption(\Memcached::OPT_CLIENT_MODE, \Memcached::DYNAMIC_CLIENT_MODE);
}
foreach ((array) $config['servers'] as $server) {
if (substr($server, 0, 5) == 'unix:') {
$this->_memcache->addServer(trim($server), 0);
} else {
list($ip, $port) = explode(':', $server);
$this->_memcache->addServer(trim($ip), (int) trim($port));
}
}
if (isset($config['username']) && !empty($config['username']) && method_exists($this->_memcache, 'setSaslAuthData') && ini_get('memcached.use_sasl')) {
$this->_memcache->setSaslAuthData($config['username'], $config['password']);
}
return true;
}
/**
* 获得Memcache连接
*
* @return Memcache Memcache连接
*/
public static function get_memcached()
{
if (Cache::$memcached === null) {
Cache::$memcached = new Memcached('ocs');
if (count(Cache::$memcached->getServerList()) == 0) {
/*建立连接前，先判断*/
/*所有option都要放在判断里面，因为有的option会导致重连，让长连接变短连接！*/
Cache::$memcached->setOption(Memcached::OPT_COMPRESSION, false);
Cache::$memcached->setOption(Memcached::OPT_BINARY_PROTOCOL, true);
/* addServer 代码必须在判断里面，否则相当于重复建立’ocs’这个连接池，可能会导致客户端php程序异常*/
foreach (Conf::$memcached as $k => $memconf) {
Cache::$memcached->addServer($memconf[0], $memconf[1]);
}
if (Conf::$memcached_un) {
Cache::$memcached->setSaslAuthData(Conf::$memcached_un, Conf::$memcached_pwd);
}
}
return Cache::$memcached;
} else {
return Cache::$memcached;
}
}
