update Piwik to version 2.16 (fixes #91)

www/analytics/core/Translation/Loader/LoaderCache.php

@@ -0,0 +1,65 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Translation\Loader;
+
+use Piwik\Cache;
+
+/**
+ * Caches the translations loaded by another loader.
+ */
+class LoaderCache implements LoaderInterface
+{
+    /**
+     * @var LoaderInterface
+     */
+    private $loader;
+
+    /**
+     * @var Cache\Lazy
+     */
+    private $cache;
+
+    public function __construct(LoaderInterface $loader, Cache\Lazy $cache)
+    {
+        $this->loader = $loader;
+        $this->cache = $cache;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function load($language, array $directories)
+    {
+        if (empty($language)) {
+            return array();
+        }
+
+        $cacheKey = $this->getCacheKey($language, $directories);
+
+        $translations = $this->cache->fetch($cacheKey);
+
+        if (empty($translations) || !is_array($translations)) {
+            $translations = $this->loader->load($language, $directories);
+
+            $this->cache->save($cacheKey, $translations, 43200); // ttl=12hours
+        }
+
+        return $translations;
+    }
+
+    private function getCacheKey($language, array $directories)
+    {
+        $cacheKey = 'Translations-' . $language . '-';
+
+        // in case loaded plugins change (ie Tests vs Tracker vs UI etc)
+        $cacheKey .= sha1(implode('', $directories));
+
+        return $cacheKey;
+    }
+}