Commit Graph

4 Commits

Author SHA1 Message Date
Drew Jaynes
feb3c20d12 Docs: Standardize file header summary for wp-includes/class-wp-metadata-lazyloader.php.
See [36897]. See #35986.

Built from https://develop.svn.wordpress.org/trunk@36899


git-svn-id: http://core.svn.wordpress.org/trunk@36867 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-03-09 16:59:27 +00:00
Drew Jaynes
e7bea9ba6e Docs: Improve inline documentation syntax throughout WP_Metadata_Lazyloader, introduced in [36566].
See #35816. See #35986.

Built from https://develop.svn.wordpress.org/trunk@36898


git-svn-id: http://core.svn.wordpress.org/trunk@36866 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-03-09 16:55:26 +00:00
Drew Jaynes
a1b18a3ae6 Docs: Add a missing file header to wp-includes/class-wp-metadata-lazyloader.php, introduced in [36566].
See #35816. See #35986.

Built from https://develop.svn.wordpress.org/trunk@36897


git-svn-id: http://core.svn.wordpress.org/trunk@36865 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-03-09 16:52:27 +00:00
Boone Gorges
571e14f897 More performance improvements to metadata lazyloading.
Comment and term meta lazyloading for `WP_Query` loops, introduced in 4.4,
depended on filter callback methods belonging to `WP_Query` objects. This meant
storing `WP_Query` objects in the `$wp_filter` global (via `add_filter()`),
requiring that PHP retain the objects in memory, even when the local variables
would typically be expunged during normal garbage collection. In cases where a
large number of `WP_Query` objects were instantiated on a single pageload,
and/or where the contents of the `WP_Query` objects were quite large, serious
performance issues could result.

We skirt this problem by moving metadata lazyloading out of `WP_Query`. The
new `WP_Metadata_Lazyloader` class acts as a lazyload queue. Query instances
register items whose metadata should be lazyloaded - such as post terms, or
comments - and a `WP_Metadata_Lazyloader` method will intercept comment and
term meta requests to perform the cache priming. Since `WP_Metadata_Lazyloader`
instances are far smaller than `WP_Query` (containing only object IDs), and
clean up after themselves far better than the previous `WP_Query` methods (bp
only running their callbacks a single time for a given set of queued objects),
the resource use is decreased dramatically.

See [36525] for an earlier step in this direction.

Props lpawlik, stevegrunwell, boonebgorges.
Fixes #35816.
Built from https://develop.svn.wordpress.org/trunk@36566


git-svn-id: http://core.svn.wordpress.org/trunk@36533 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-02-17 22:58:26 +00:00