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// This file is part of Moodle -
// 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
// 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 <>.
* Core cache definitions.
* This file is part of Moodle's cache API, affectionately called MUC.
* It contains the components that are requried in order to use caching.
* @package core
* @category cache
* @copyright 2012 Sam Hemelryk
* @license GNU GPL v3 or later
$definitions = array(
// Used to store processed lang files.
// The keys used are the component of the string file.
'string' => array(
'mode' => cache_store::MODE_APPLICATION,
'simplekeys' => true,
'simpledata' => true,
'persistent' => true,
'persistentmaxsize' => 3
// Used to store database meta information.
// The database meta information includes information about tables and there columns.
// Its keys are the table names.
// When creating an instance of this definition you must provide the database family that is being used.
'databasemeta' => array(
'mode' => cache_store::MODE_APPLICATION,
'requireidentifiers' => array(
'persistent' => true,
'persistentmaxsize' => 2
// Event invalidation cache.
// This cache is used to manage event invalidation, its keys are the event names.
// Whenever something is invalidated it is both purged immediately and an event record created with the timestamp.
// When a new cache is initialised all timestamps are looked at and if past data is once more invalidated.
// Data guarantee is required in order to ensure invalidation always occurs.
// Persistence has been turned on as normally events are used for frequently used caches and this event invalidation
// cache will likely be used either lots or never.
'eventinvalidation' => array(
'mode' => cache_store::MODE_APPLICATION,
'persistent' => true,
'requiredataguarantee' => true,
'simpledata' => true,
// Cache for question definitions. This is used by the question_bank class.
// Users probably do not need to know about this cache. They will just call
// question_bank::load_question.
'questiondata' => array(
'mode' => cache_store::MODE_APPLICATION,
'simplekeys' => true, // The id of the question is used.
'requiredataguarantee' => false,
'datasource' => 'question_finder',
'datasourcefile' => 'question/engine/bank.php',
// HTML Purifier cache
// This caches the html purifier cleaned text. This is done because the text is usually cleaned once for every user
// and context combo. Text caching handles caching for the combonation, this cache is responsible for caching the
// cleaned text which is shareable.
'htmlpurifier' => array(
'mode' => cache_store::MODE_APPLICATION,
// Used to store data from the config + config_plugins table in the database.
// The key used is the component:
// - core for all core config settings
// - plugin component for all plugin settings.
// Persistence is used because normally several settings within a script.
'config' => array(
'mode' => cache_store::MODE_APPLICATION,
'persistent' => true,
'simpledata' => true
// Groupings belonging to a course.
// A simple cache designed to replace $GROUPLIB_CACHE->groupings.
// Items are organised by course id and are essentially course records.
'groupdata' => array(
'mode' => cache_store::MODE_APPLICATION,
'simplekeys' => true, // The course id the groupings exist for.
'simpledata' => true, // Array of stdClass objects containing only strings.
'persistent' => true, // Likely there will be a couple of calls to this.
'persistmaxsize' => 2, // The original cache used 1, we've increased that to two.
// Used to cache calendar subscriptions.
'calendar_subscriptions' => array(
'mode' => cache_store::MODE_APPLICATION,
'simplekeys' => true,
'simpledata' => true,
'persistent' => true,
// Cache for the list of installed plugins - {@see get_plugin_list()}.
// The key consists of the plugin type string (e.g. mod, block, enrol etc).
// The value is an associative array of plugin name => plugin location.
'pluginlist' => array(
'mode' => cache_store::MODE_APPLICATION,
'simplekeys' => true,
'simpledata' => true,
'persistent' => true,
'persistentmaxsize' => 2,
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