update Piwik to version 2.16 (fixes #91)

www/analytics/plugins/Diagnostics/Diagnostic/Diagnostic.php

@@ -0,0 +1,44 @@
+<?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\Diagnostics\Diagnostic;
+
+/**
+ * Performs a diagnostic on the system or Piwik.
+ *
+ * Example:
+ *
+ *     class MyDiagnostic implements Diagnostic
+ *     {
+ *         public function execute()
+ *         {
+ *             $results = array();
+ *
+ *             // First check (error)
+ *             $status = testSomethingIsOk() ? DiagnosticResult::STATUS_OK : DiagnosticResult::STATUS_ERROR;
+ *             $results[] = DiagnosticResult::singleResult('First check', $status);
+ *
+ *             // Second check (warning)
+ *             $status = testSomethingElseIsOk() ? DiagnosticResult::STATUS_OK : DiagnosticResult::STATUS_WARNING;
+ *             $results[] = DiagnosticResult::singleResult('Second check', $status);
+ *
+ *             return $results;
+ *         }
+ *     }
+ *
+ * Diagnostics are loaded with dependency injection support.
+ *
+ * @api
+ */
+interface Diagnostic
+{
+    /**
+     * @return DiagnosticResult[]
+     */
+    public function execute();
+}