update Piwik to version 2.16 (fixes #91)

www/analytics/core/Tracker/SettingsStorage.php

@@ -0,0 +1,58 @@
+<?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\Tracker;
+
+use Piwik\Settings\Storage;
+use Piwik\Tracker;
+use Piwik\Cache as PiwikCache;
+
+/**
+ * Loads settings from tracker cache instead of database. If not yet present in tracker cache will cache it.
+ */
+class SettingsStorage extends Storage
+{
+    protected function loadSettings()
+    {
+        $cacheId = $this->getOptionKey();
+        $cache = $this->getCache();
+
+        if ($cache->contains($cacheId)) {
+            $settings = $cache->fetch($cacheId);
+        } else {
+            $settings = parent::loadSettings();
+
+            $cache->save($cacheId, $settings);
+        }
+
+        return $settings;
+    }
+
+    public function save()
+    {
+        parent::save();
+        self::clearCache();
+    }
+
+    private function getCache()
+    {
+        return self::buildCache($this->getOptionKey());
+    }
+
+    public static function clearCache()
+    {
+        Cache::deleteTrackerCache();
+        self::buildCache()->flushAll();
+    }
+
+    private static function buildCache()
+    {
+        return PiwikCache::getEagerCache();
+    }
+}