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<?php
class MemcachedCache implements CacheInterface {
private $scope;
private $key;
private $conn;
private $expiration = 0;
private $time = false;
private $data = null;
public function __construct() {
if (!extension_loaded('memcached')) {
returnServerError('"memcached" extension not loaded. Please check "php.ini"');
}
$host = Configuration::getConfig(get_called_class(), 'host');
$port = Configuration::getConfig(get_called_class(), 'port');
if (empty($host) && empty($port)) {
returnServerError('Configuration for ' . get_called_class() . ' missing. Please check your ' . FILE_CONFIG);
} else if (empty($host)) {
returnServerError('"host" param is not set for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
} else if (empty($port)) {
returnServerError('"port" param is not set for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
} else if (!ctype_digit($port)) {
returnServerError('"port" param is invalid for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
}
$port = intval($port);
if ($port < 1 || $port > 65535) {
returnServerError('"port" param is invalid for ' . get_called_class() . '. Please check your ' . FILE_CONFIG);
}
$conn = new Memcached();
$conn->addServer($host, $port) or returnServerError('Could not connect to memcached server');
$this->conn = $conn;
}
public function loadData(){
if ($this->data) return $this->data;
$result = $this->conn->get($this->getCacheKey());
if ($result === false) {
return null;
}
$this->time = $result['time'];
$this->data = $result['data'];
return $result['data'];
}
public function saveData($datas){
$time = time();
$object_to_save = array(
'data' => $datas,
'time' => $time,
);
$result = $this->conn->set($this->getCacheKey(), $object_to_save, $this->expiration);
if($result === false) {
returnServerError('Cannot write the cache to memcached server');
}
$this->time = $time;
return $this;
}
public function getTime(){
if ($this->time === false) {
$this->loadData();
}
return $this->time;
}
public function purgeCache($duration){
// Note: does not purges cache right now
// Just sets cache expiration and leave cache purging for memcached itself
$this->expiration = $duration;
}
/**
* Set scope
* @return self
*/
public function setScope($scope){
$this->scope = $scope;
return $this;
}
/**
* Set key
* @return self
*/
public function setKey($key){
if (!empty($key) && is_array($key)) {
$key = array_map('strtolower', $key);
}
$key = json_encode($key);
if (!is_string($key)) {
throw new \Exception('The given key is invalid!');
}
$this->key = $key;
return $this;
}
private function getCacheKey(){
if(is_null($this->key)) {
returnServerError('Call "setKey" first!');
}
return 'rss_bridge_cache_' . hash('md5', $this->scope . $this->key . 'A');
}
}
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