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<?php
namespace ActiveRecord;
use Closure;
/**
* Cache::get('the-cache-key', function() {
* # this gets executed when cache is stale
* return "your cacheable datas";
* });
*/
class Cache
{
static $adapter = null;
static $options = array();
/**
* Initializes the cache.
*
* With the $options array it's possible to define:
* - expiration of the key, (time in seconds)
* - a namespace for the key
*
* this last one is useful in the case two applications use
* a shared key/store (for instance a shared Memcached db)
*
* Ex:
* $cfg_ar = ActiveRecord\Config::instance();
* $cfg_ar->set_cache('memcache://localhost:11211',array('namespace' => 'my_cool_app',
* 'expire' => 120
* ));
*
* In the example above all the keys expire after 120 seconds, and the
* all get a postfix 'my_cool_app'.
*
* (Note: expiring needs to be implemented in your cache store.)
*
* @param string $url URL to your cache server
* @param array $options Specify additional options
*/
public static function initialize($url, $options=array())
{
if ($url)
{
$url = parse_url($url);
$file = ucwords(Inflector::instance()->camelize($url['scheme']));
$class = "ActiveRecord\\$file";
require_once __DIR__ . "/cache/$file.php";
static::$adapter = new $class($url);
}
else
static::$adapter = null;
static::$options = array_merge(array('expire' => 30, 'namespace' => ''),$options);
}
public static function flush()
{
if (static::$adapter)
static::$adapter->flush();
}
public static function get($key, $closure)
{
$key = static::get_namespace() . $key;
if (!static::$adapter)
return $closure();
if (!($value = static::$adapter->read($key)))
static::$adapter->write($key,($value = $closure()),static::$options['expire']);
return $value;
}
private static function get_namespace()
{
return (isset(static::$options['namespace']) && strlen(static::$options['namespace']) > 0) ? (static::$options['namespace'] . "::") : "";
}
}
?>
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