MDL-38391 lib: Rewrite YUI_config as a class
[moodle.git] / lib / db / caches.php
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d6a1f63b 1<?php
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2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * Core cache definitions.
19 *
20 * This file is part of Moodle's cache API, affectionately called MUC.
21 * It contains the components that are requried in order to use caching.
22 *
23 * @package core
24 * @category cache
25 * @copyright 2012 Sam Hemelryk
26 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
27 */
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28
29$definitions = array(
a560d636 30
170f821b 31 // Used to store processed lang files.
47834bcd 32 // The keys used are the component of the string file.
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33 'string' => array(
34 'mode' => cache_store::MODE_APPLICATION,
47834bcd 35 'simplekeys' => true,
2e1e266c 36 'simpledata' => true,
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37 'persistent' => true,
38 'persistentmaxsize' => 3
39 ),
a560d636 40
170f821b 41 // Used to store database meta information.
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42 // The database meta information includes information about tables and there columns.
43 // Its keys are the table names.
44 // When creating an instance of this definition you must provide the database family that is being used.
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45 'databasemeta' => array(
46 'mode' => cache_store::MODE_APPLICATION,
47 'requireidentifiers' => array(
48 'dbfamily'
49 ),
50 'persistent' => true,
51 'persistentmaxsize' => 2
52 ),
a560d636 53
170f821b 54 // Event invalidation cache.
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55 // This cache is used to manage event invalidation, its keys are the event names.
56 // Whenever something is invalidated it is both purged immediately and an event record created with the timestamp.
57 // When a new cache is initialised all timestamps are looked at and if past data is once more invalidated.
58 // Data guarantee is required in order to ensure invalidation always occurs.
59 // Persistence has been turned on as normally events are used for frequently used caches and this event invalidation
60 // cache will likely be used either lots or never.
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61 'eventinvalidation' => array(
62 'mode' => cache_store::MODE_APPLICATION,
63 'persistent' => true,
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64 'requiredataguarantee' => true,
65 'simpledata' => true,
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66 ),
67
68 // Cache for question definitions. This is used by the question_bank class.
69 // Users probably do not need to know about this cache. They will just call
70 // question_bank::load_question.
71 'questiondata' => array(
72 'mode' => cache_store::MODE_APPLICATION,
47834bcd 73 'simplekeys' => true, // The id of the question is used.
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74 'requiredataguarantee' => false,
75 'datasource' => 'question_finder',
76 'datasourcefile' => 'question/engine/bank.php',
77 ),
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78
79 // HTML Purifier cache
80 // This caches the html purifier cleaned text. This is done because the text is usually cleaned once for every user
81 // and context combo. Text caching handles caching for the combonation, this cache is responsible for caching the
82 // cleaned text which is shareable.
83 'htmlpurifier' => array(
84 'mode' => cache_store::MODE_APPLICATION,
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85 ),
86
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87 // Used to store data from the config + config_plugins table in the database.
88 // The key used is the component:
89 // - core for all core config settings
90 // - plugin component for all plugin settings.
91 // Persistence is used because normally several settings within a script.
92 'config' => array(
93 'mode' => cache_store::MODE_APPLICATION,
94 'persistent' => true,
95 'simpledata' => true
96 ),
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97
98 // Groupings belonging to a course.
99 // A simple cache designed to replace $GROUPLIB_CACHE->groupings.
100 // Items are organised by course id and are essentially course records.
101 'groupdata' => array(
102 'mode' => cache_store::MODE_APPLICATION,
103 'simplekeys' => true, // The course id the groupings exist for.
104 'simpledata' => true, // Array of stdClass objects containing only strings.
34424d4c 105 'persistent' => true, // Likely there will be a couple of calls to this.
e17dbeeb 106 'persistmaxsize' => 2, // The original cache used 1, we've increased that to two.
59573bb4 107 ),
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108 // Used to cache calendar subscriptions.
109 'calendar_subscriptions' => array(
110 'mode' => cache_store::MODE_APPLICATION,
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111 'simplekeys' => true,
112 'simpledata' => true,
e73b527c 113 'persistent' => true,
59573bb4 114 )
d6a1f63b 115);