[+] Classes: add local cache system

classes/Address.php

@@ -134,13 +134,7 @@ class AddressCore extends ObjectModel
 
 		/* Get and cache address country name */
 		if ($this->id)
-		{
+			$this->country = Country::getNameById($id_lang ? $id_lang : Configuration::get('PS_LANG_DEFAULT'), $this->id_country);
-			$result = Db::getInstance()->getRow('
-			SELECT `name` FROM `'._DB_PREFIX_.'country_lang`
-												WHERE `id_country` = '.(int)$this->id_country.'
-												AND `id_lang` = '.($id_lang ? (int)$id_lang : Configuration::get('PS_LANG_DEFAULT')));
-			$this->country = $result['name'];
-		}
 	}
 
 	public function add($autodate = true, $null_values = false)

classes/Country.php

@@ -214,14 +214,16 @@ class CountryCore extends ObjectModel
 	*/
 	public static function getNameById($id_lang, $id_country)
 	{
-		$result = Db::getInstance(_PS_USE_SQL_SLAVE_)->getRow('
+		$key = $id_country.'_'.$id_lang;
-			SELECT `name`
+		if (!Cache::isStored($key))
-			FROM `'._DB_PREFIX_.'country_lang`
+			Cache::store($key, Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue('
-			WHERE `id_lang` = '.(int)$id_lang.'
+				SELECT `name`
-			AND `id_country` = '.(int)$id_country
+				FROM `'._DB_PREFIX_.'country_lang`
-		);
+				WHERE `id_lang` = '.(int)$id_lang.'
+				AND `id_country` = '.(int)$id_country
+			));
 
-		return $result['name'];
+		return Cache::retrieve($key);
 	}
 
 	/**

classes/cache/Cache.php

@@ -70,6 +70,11 @@ abstract class CacheCore
 		'page_viewed',
 	);
 
+	/**
+	 * @var array Store local cache
+	 */
+	protected static $local = array();
+
 	/**
 	 * Cache a data
 	 *
@@ -291,4 +296,24 @@ abstract class CacheCore
 				return true;
 		return false;
 	}
+
+	public static function store($key, $value)
+	{
+		Cache::$local[$key] = $value;
+	}
+
+	public static function retrieve($key)
+	{
+		return isset(Cache::$local[$key]) ? Cache::$local[$key] : null;
+	}
+
+	public static function isStored($key)
+	{
+		return isset(Cache::$local[$key]);
+	}
+
+	public static function clean($key)
+	{
+		unset(Cache::$local[$key]);
+	}
 }