MDL-82158 core_cache: Move interfaces

cache/classes/request_cache.php

@@ -0,0 +1,35 @@
+<?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/>.
+
+/**
+ * An request cache.
+ *
+ * This class is used for request caches returned by the cache::make methods.
+ *
+ * This cache class should never be interacted with directly. Instead you should always use the cache::make methods.
+ * It is technically possible to call those methods through this class however there is no guarantee that you will get an
+ * instance of this class back again.
+ *
+ * @internal don't use me directly.
+ *
+ * @package    core
+ * @category   cache
+ * @copyright  2012 Sam Hemelryk
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class cache_request extends cache {
+    // This comment appeases code pre-checker ;) !
+}