MDL-37658 add new logging API with basic implemenation

lib/classes/log/manager.php

@@ -0,0 +1,52 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Log storage manager interface.
+ *
+ * @package    core
+ * @copyright  2013 Petr Skoda {@link http://skodak.org}
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace core\log;
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Interface describing log readers.
+ *
+ * This is intended for reports, use get_log_manager() to get
+ * the configured instance.
+ *
+ * @package core\log
+ */
+interface manager {
+    /**
+     * Return list of available log readers in given
+     * context for current user.
+     *
+     * @param \context $context
+     * @return \core\log\reader[]
+     */
+    public function get_readers(\context $context);
+
+    /**
+     * Dispose all initialised stores.
+     * @return void
+     */
+    public function dispose();
+}