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<?php
/**
* ElggStaticVariableCache
* Dummy cache which stores values in a static array. Using this makes future
* replacements to other caching back ends (eg memcache) much easier.
*
* @package Elgg.Core
* @subpackage Cache
*/
class ElggStaticVariableCache extends ElggSharedMemoryCache {
/**
* The cache.
*
* @var array
*/
private static $__cache;
/**
* Create the variable cache.
*
* This function creates a variable cache in a static variable in
* memory, optionally with a given namespace (to avoid overlap).
*
* @param string $namespace The namespace for this cache to write to.
* @warning namespaces of the same name are shared!
*/
function __construct($namespace = 'default') {
$this->setNamespace($namespace);
$this->clear();
}
/**
* Save a key
*
* @param string $key Name
* @param string $data Value
*
* @return boolean
*/
public function save($key, $data) {
$namespace = $this->getNamespace();
ElggStaticVariableCache::$__cache[$namespace][$key] = $data;
return true;
}
/**
* Load a key
*
* @param string $key Name
* @param int $offset Offset
* @param int $limit Limit
*
* @return string
*/
public function load($key, $offset = 0, $limit = null) {
$namespace = $this->getNamespace();
if (isset(ElggStaticVariableCache::$__cache[$namespace][$key])) {
return ElggStaticVariableCache::$__cache[$namespace][$key];
}
return false;
}
/**
* Invalidate a given key.
*
* @param string $key Name
*
* @return bool
*/
public function delete($key) {
$namespace = $this->getNamespace();
unset(ElggStaticVariableCache::$__cache[$namespace][$key]);
return true;
}
/**
* Clears the cache for a particular namespace
*
* @return void
*/
public function clear() {
$namespace = $this->getNamespace();
if (!isset(ElggStaticVariableCache::$__cache)) {
ElggStaticVariableCache::$__cache = array();
}
ElggStaticVariableCache::$__cache[$namespace] = array();
}
}
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