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Regenerate the term hierarchy cache (`{taxonomy}_children`) when it is out of sync with the passed taxonomy's `last_changed` value. 

Introduces `taxonomy_hierarchy_is_fresh()`, which is only called in `_get_term_hierarchy()`. The taxonomy's `last_changed` value is checked against the value of `wp_cache_get( 'hierarchy_last_changed', $taxonomy )`.

Adds a unit test - `Tests_Term:test_hierachy_invalidation()`.

See [27101], which makes this type of cache invalidation possible.
Fixes #14485.


Built from https://develop.svn.wordpress.org/trunk@27102


git-svn-id: http://core.svn.wordpress.org/trunk@26971 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Scott Taylor 2014-02-06 01:58:14 +00:00
parent 578dbcd9f5
commit 5d03d8eb50
1 changed files with 25 additions and 1 deletions
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24
wp-includes/taxonomy.php
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@ -2948,7 +2948,10 @@ function update_term_cache($terms, $taxonomy = '') {
function _get_term_hierarchy($taxonomy) {
if ( !is_taxonomy_hierarchical($taxonomy) )
return array();
$children = false;
if ( taxonomy_hierarchy_is_fresh( $taxonomy ) ) {
$children = get_option("{$taxonomy}_children");
}
if ( is_array($children) )
return $children;
@ -3521,6 +3524,7 @@ function set_taxonomy_last_changed( $taxonomy ) {
/**
* Determine if a post's cache for the passed taxonomy
* is in sync.
*
* @since 3.9.0
*
* @param int $id
@ -3536,3 +3540,23 @@ function post_taxonomy_is_fresh( $id, $taxonomy ) {
}
return true;
}
/**
* Determine if a hierarchy's cache for the passed taxonomy
* is in sync.
*
* @since 3.9.0
*
* @param int $id
* @param string $taxonomy
* @return boolean
*/
function taxonomy_hierarchy_is_fresh( $taxonomy ) {
$last_changed = get_taxonomy_last_changed( $taxonomy );
$hierarchy_last_changed = wp_cache_get( 'hierarchy_last_changed', $taxonomy );
if ( ! $hierarchy_last_changed || $last_changed !== $hierarchy_last_changed ) {
wp_cache_set( 'hierarchy_last_changed', $last_changed, $taxonomy );
return false;
}
return true;
}