bbpress / bbp-includes / bbp-core-cache.php

bbp-core-cache.php in bbPress 2.1-rc2, at bbp-includes/bbp-core-cache.php

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1	<?php
2
3	/**
4	* bbPress Cache Helpers
5	*
6	* Helper functions used to communicate with WordPress's various caches. Many
7	* of these functions are used to work around specific WordPress nuances. They
8	* are subject to changes, tweaking, and will need iteration as performance
9	* improvements are made to WordPress core.
10	*
11	* @package bbPress
12	* @subpackage Cache
13	*/
14
15	// Exit if accessed directly
16	if ( !defined( 'ABSPATH' ) ) exit;
17
18	/ Helpers *****************************************************************/
19
20	/**
21	* Skip invalidation of child post content when editing a parent.
22	*
23	* This prevents invalidating caches for topics and replies when editing a forum
24	* or a topic. Without this in place, WordPress will attempt to invalidate all
25	* child posts whenever a parent post is modified. This can cause thousands of
26	* cache invalidations to occur on a single edit, which is no good for anyone.
27	*
28	* @since bbPress (r4011)
29	*
30	* @package bbPress
31	* @subpackage Cache
32	*/
33	class BBP_Skip_Children {
34
35	/**
36	* @var int Post ID being updated
37	*/
38	private $updating_post = 0;
39
40	/**
41	* @var bool The original value of $_wp_suspend_cache_invalidation global
42	*/
43	private $original_cache_invalidation = false;
44
45	/ Methods *************************************************************/
46
47	/**
48	* Hook into the 'pre_post_update' action.
49	*
50	* @since bbPress (r4011)
51	*/
52	public function __construct() {
53	add_action( 'pre_post_update', array( $this, 'pre_post_update' ) );
54	}
55
56	/**
57	* Only clean post caches for main bbPress posts.
58	*
59	* Check that the post being updated is a bbPress post type, saves the
60	* post ID to be used later, and adds an action to 'clean_post_cache' that
61	* prevents child post caches from being cleared.
62	*
63	* @since bbPress (r4011)
64	*
65	* @param int $post_id The post ID being updated
66	* @return If invalid post data
67	*/
68	public function pre_post_update( $post_id = 0 ) {
69
70	// Bail if post ID is not a bbPress post type
71	if ( empty( $post_id ) \|\| ! bbp_is_custom_post_type( $post_id ) )
72	return;
73
74	// Store the $post_id
75	$this->updating_post = $post_id;
76
77	// Skip related post cache invalidation. This prevents invalidating the
78	// caches of the child posts when there is no reason to do so.
79	add_action( 'clean_post_cache', array( $this, 'skip_related_posts' ) );
80	}
81
82	/**
83	* Skip cache invalidation of related posts if the post ID being invalidated
84	* is not the one that was just updated.
85	*
86	* @since bbPress (r4011)
87	*
88	* @param int $post_id The post ID of the cache being invalidated
89	* @return If invalid post data
90	*/
91	public function skip_related_posts( $post_id = 0 ) {
92
93	// Bail if this post is not the current bbPress post
94	if ( empty( $post_id ) \|\| ( $this->updating_post !== $post_id ) )
95	return;
96
97	// Stash the current cache invalidation value in a variable, so we can
98	// restore back to it nicely in the future.
99	global $_wp_suspend_cache_invalidation;
100
101	$this->original_cache_invalidation = $_wp_suspend_cache_invalidation;
102
103	// Turn off cache invalidation
104	wp_suspend_cache_invalidation( true );
105
106	// Restore cache invalidation
107	add_action( 'wp_insert_post', array( $this, 'restore_cache_invalidation' ) );
108	}
109
110	/**
111	* Restore the cache invalidation to its previous value.
112	*
113	* @since bbPress (r4011)
114	* @uses wp_suspend_cache_invalidation()
115	*/
116	public function restore_cache_invalidation() {
117	wp_suspend_cache_invalidation( $this->original_cache_invalidation );
118	}
119	}
120	new BBP_Skip_Children();
121