76 lines
2.7 KiB
PHP
76 lines
2.7 KiB
PHP
<?php
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// Make sure we are called from index.php
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if (!defined('SECURITY'))
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die('Hacking attempt');
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/**
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* A wrapper class used to store values transparently in memcache
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* Can be enabled or disabled through site configuration
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* Also sets a default time if no time is passed to it to enforce caching
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**/
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class StatsCache {
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private $cache;
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public function __construct($config, $debug) {
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$this->config = $config;
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$this->debug = $debug;
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if (! $config['memcache']['enabled'] ) {
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$this->debug->append("Not storing any values in memcache");
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} else {
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$this->cache = new Memcached();
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}
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}
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/**
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* Wrapper around memcache->set
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* Do not store values if memcache is disabled
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**/
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public function set($key, $value, $expiration=NULL) {
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if (! $this->config['memcache']['enabled']) return false;
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if (empty($expiration))
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$expiration = $this->config['memcache']['expiration'] + rand( -$this->config['memcache']['splay'], $this->config['memcache']['splay']);
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$this->debug->append("Storing " . $this->config['memcache']['keyprefix'] . "$key with expiration $expiration", 3);
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return $this->cache->set($this->config['memcache']['keyprefix'] . $key, $value, $expiration);
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}
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/**
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* Wrapper around memcache->get
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* Always return false if memcache is disabled
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**/
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public function get($key, $cache_cb = NULL, &$cas_token = NULL) {
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if (! $this->config['memcache']['enabled']) return false;
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$this->debug->append("Trying to fetch key " . $this->config['memcache']['keyprefix'] . "$key from cache", 3);
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if ($data = $this->cache->get($this->config['memcache']['keyprefix'].$key)) {
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$this->debug->append("Found key in cache", 3);
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return $data;
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} else {
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$this->debug->append("Key not found", 3);
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}
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}
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/**
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* Another wrapper, we want to store data in memcache and return the actual data
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* for further processing
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* @param key string Our memcache key
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* @param data mixed Our data to store in Memcache
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* @param expiration time Our expiration time, see Memcached documentation
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* @return data mixed Return our stored data unchanged
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**/
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public function setCache($key, $data, $expiration=NULL) {
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if ($this->config['memcache']['enabled']) $this->set($key, $data, $expiration);
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return $data;
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}
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/**
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* This method is invoked if the called method was not realised in this class
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**/
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public function __call($name, $arguments) {
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if (! $this->config['memcache']['enabled']) return false;
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//Invoke method $name of $this->cache class with array of $arguments
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return call_user_func_array(array($this->cache, $name), $arguments);
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}
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}
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$memcache = new StatsCache($config, $debug);
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$memcache->addServer($config['memcache']['host'], $config['memcache']['port']);
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