implementing key/value store of Persistance in Database storage

lib/Data/Filesystem.php

@@ -38,15 +38,6 @@ class Filesystem extends AbstractData
      */
     private static $_path = 'data';
 
-    /**
-     * cache for the traffic limiter
-     *
-     * @access private
-     * @static
-     * @var    array
-     */
-    private static $_traffic_limiter_cache = array();
-
     /**
      * get instance of singleton
      *
@@ -249,27 +240,6 @@ class Filesystem extends AbstractData
         );
     }
 
-    /**
-     * Purge outdated entries.
-     *
-     * @access public
-     * @param  string $namespace
-     * @param  int $time
-     * @return void
-     */
-    public function purgeValues($namespace, $time)
-    {
-        switch ($namespace) {
-            case 'traffic_limiter':
-                foreach (self::$_traffic_limiter_cache as $key => $last_access) {
-                    if ($last_access <= $time) {
-                        unset(self::$_traffic_limiter_cache[$key]);
-                    }
-                }
-                break;
-        }
-    }
-
     /**
      * Save a value.
      *