130 lines
2.9 KiB
PHP
130 lines
2.9 KiB
PHP
<?php
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/**
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* Implementation methode Memoization
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*
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* @package SPIP\memoization\Memo
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**/
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// Sécurité
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if (!defined('_ECRIRE_INC_VERSION')){
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return;
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}
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if (!defined('_CACHE_NAMESPACE')){
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define('_CACHE_NAMESPACE', $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . ":");
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}
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if (!defined('_CACHE_KEY')){
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define('_CACHE_KEY', '0123456789ABCDEF');
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}
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class MCacheBackend_apc implements MCacheBackend {
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private function key_for_lock($str){
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return _CACHE_NAMESPACE . 'lock:' . md5($str . "locked");
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}
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private function _xor($message){
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$key = _CACHE_KEY;
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$keylen = strlen($key);
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if (!$keylen){
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return $message;
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}
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$messagelen = strlen($message);
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for ($i = 0; $i<$messagelen; $i++){
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$message[$i] = ~($message[$i] ^ $key[$i%$keylen]);
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}
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return $message;
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}
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private function store_value($value){
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if (is_object($value)
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or is_array($value)
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or is_bool($value)
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or !$value){
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return array($this->_xor(serialize($value)));
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}
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return $this->_xor($value);
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}
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private function unstore_value($a){
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if (is_null($a)){
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return $a;
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}
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// maybe_unserialize
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if (is_array($a)){
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return @unserialize($this->_xor($a[0]));
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}
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return $this->_xor($a);
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}
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/* Interface */
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public function init($params = null){
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}
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public function get($key){
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$a = apc_fetch(_CACHE_NAMESPACE . $key);
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return $this->unstore_value($a);
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}
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public function set($key, $value, $ttl = null){
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return is_null($ttl)
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? apc_store(_CACHE_NAMESPACE . $key, $this->store_value($value))
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: apc_store(_CACHE_NAMESPACE . $key, $this->store_value($value), $ttl);
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}
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public function exists($key){
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return apc_exists(_CACHE_NAMESPACE . $key);
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}
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public function del($key){
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return apc_delete(_CACHE_NAMESPACE . $key);
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}
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public function inc($key, $value = null, $ttl = null){
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while (true){
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if ($this->lock($key)){
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$value = isset($value) ? intval($value) : 1;
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$value += intval($this->get($key));
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$this->set($key, $value, $ttl);
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$this->unlock($key);
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return $value;
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}
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}
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}
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public function dec($key, $value = null, $ttl = null){
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$value = isset($value) ? intval($value) : 1;
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return $this->inc($key, -$value, $ttl);
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}
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public function lock($key, /* private */ $unlock = false){
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return apc_add($this->key_for_lock($key), true);
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}
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public function unlock($key){
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return apc_delete($this->key_for_lock($key));
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}
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public function size(){
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if (!class_exists('APCIterator')){
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return false;
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}
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$a = new APCIterator('user', '/^' . preg_quote(_CACHE_NAMESPACE) . '/', APC_ITER_ALL, 256*256);
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return $a->getTotalSize();
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}
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public function purge(){
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// le cache en memoire est de toute facon invalide par la globale cache_mark et le ttl est cense nettoyer le reste
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if (!class_exists('APCIterator')){
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return false;
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}
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$a = new APCIterator('user', '/^' . preg_quote(_CACHE_NAMESPACE) . '/', APC_ITER_ALL, 256*256);
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apc_delete($a);
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return true;
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}
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}
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