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<?php
/**
* Memcache CacheResource
* CacheResource Implementation based on the KeyValueStore API to use
* memcache as the storage resource for Smarty's output caching.
* Note that memcache has a limitation of 256 characters per cache-key.
* To avoid complications all cache-keys are translated to a sha1 hash.
*
* @package CacheResource-examples
* @author Rodney Rehm
*/
class Smarty_CacheResource_Memcache extends Smarty_CacheResource_KeyValueStore
{
/**
* memcache instance
*
* @var Memcache
*/
protected $memcache = null;
/**
* Smarty_CacheResource_Memcache constructor.
*/
public function __construct()
{
if (class_exists('Memcached')) {
$this->memcache = new Memcached();
} else {
$this->memcache = new Memcache();
}
$this->memcache->addServer('127.0.0.1', 11211);
}
/**
* Read values for a set of keys from cache
*
* @param array $keys list of keys to fetch
*
* @return array list of values with the given keys used as indexes
* @return boolean true on success, false on failure
*/
protected function read(array $keys)
{
$_keys = $lookup = array();
foreach ($keys as $k) {
$_k = sha1($k);
$_keys[] = $_k;
$lookup[ $_k ] = $k;
}
$_res = array();
$res = $this->memcache->get($_keys);
foreach ($res as $k => $v) {
$_res[ $lookup[ $k ] ] = $v;
}
return $_res;
}
/**
* Save values for a set of keys to cache
*
* @param array $keys list of values to save
* @param int $expire expiration time
*
* @return boolean true on success, false on failure
*/
protected function write(array $keys, $expire = null)
{
foreach ($keys as $k => $v) {
$k = sha1($k);
$this->memcache->set($k, $v, 0, $expire);
}
return true;
}
/**
* Remove values from cache
*
* @param array $keys list of keys to delete
*
* @return boolean true on success, false on failure
*/
protected function delete(array $keys)
{
foreach ($keys as $k) {
$k = sha1($k);
$this->memcache->delete($k);
}
return true;
}
/**
* Remove *all* values from cache
*
* @return boolean true on success, false on failure
*/
protected function purge()
{
return $this->memcache->flush();
}
}
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