update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/SEO/Metric/ProviderCache.php

@@ -0,0 +1,48 @@
+<?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\Plugins\SEO\Metric;
+
+use Piwik\Cache;
+
+/**
+ * Caches another provider.
+ */
+class ProviderCache implements MetricsProvider
+{
+    /**
+     * @var MetricsProvider
+     */
+    private $provider;
+
+    /**
+     * @var Cache\Lazy
+     */
+    private $cache;
+
+    public function __construct(MetricsProvider $provider)
+    {
+        $this->provider = $provider;
+        $this->cache = Cache::getLazyCache();
+    }
+
+    public function getMetrics($domain)
+    {
+        $cacheId = 'SEO_getRank_' . md5($domain);
+
+        $metrics = $this->cache->fetch($cacheId);
+
+        if (! is_array($metrics)) {
+            $metrics = $this->provider->getMetrics($domain);
+
+            $this->cache->save($cacheId, $metrics, 60 * 60 * 6);
+        }
+
+        return $metrics;
+    }
+}