Implemented a caching mechanism for getting the lastmod of a translator

lib/Skeleton/I18n/Translator/Storage/Config.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Config class
+ * Configuration for Skeleton\I18n\Translator\Storage
+ *
+ * @author Lionel Laffineur <[email protected]>
+ */
+
+namespace Skeleton\I18n\Translator\Storage;
+
+class Config {
+
+	/**
+	 * Tmp path
+	 *
+	 * This folder will be used to create a cache for resized pictures
+	 *
+	 * @access public
+	 * @var string $tmp_path
+	 */
+	public static $tmp_path = '/tmp';
+}

lib/Skeleton/I18n/Translator/Storage/Database/Translation/Target.php

@@ -62,16 +62,33 @@ public static function get_by_source_language(Source $source, \Skeleton\I18n\Lan
 		return $target;
 	}
 
+	/**
+	 * get last modified
+	 *
+	 * @access public
+	 * @param string $translator_name
+	 * @return DateTime
+	 */
 	public static function get_last_modified($translator_name) {
 		$db = Database::get();
-		$updated = $db->get_one('
-			SELECT ifnull(translation_target.updated, translation_target.created) as last_modified
-			FROM translation_source, translation_target
-			WHERE translation_target.translation_source_id=translation_source.id and name= ?
-			ORDER BY last_modified DESC LIMIT 1', [ $translator_name ]);
+
+		if (file_exists(\Skeleton\I18n\Translator\Storage\Config::$tmp_path) === false) {
+			mkdir(\Skeleton\I18n\Translator\Storage\Config::$tmp_path, 0755, true);
+		}
+
+		if (file_exists(\Skeleton\I18n\Translator\Storage\Config::$tmp_path . '/' . $translator_name) && filemtime(\Skeleton\I18n\Translator\Storage\Config::$tmp_path . '/' . $translator_name) + 60 > time()) {
+			return new \DateTime(file_get_contents(\Skeleton\I18n\Translator\Storage\Config::$tmp_path . '/' . $translator_name));
+		}
+
+		$updated = $db->get_one('	SELECT ifnull(translation_target.updated, translation_target.created) as last_modified
+									FROM translation_source, translation_target
+									WHERE translation_target.translation_source_id=translation_source.id and name= ?
+									ORDER BY last_modified DESC LIMIT 1', [ $translator_name ]);
 		if ($updated === null) {
 			return null;
 		}
+
+		file_put_contents(\Skeleton\I18n\Translator\Storage\Config::$tmp_path . '/' . $translator_name, $updated);
 		return new \DateTime($updated);
 	}
 }