[wp-trac] [WordPress Trac] #21401: Load packaged object cache when advanced-cache.php and object-cache.php don't implement wp_cache_init( )

[WordPress Trac]

#21401: Load packaged object cache when advanced-cache.php and object-cache.php
don't implement wp_cache_init( )
----------------------------+-----------------------------
 Reporter:  wonderboymusic  |      Owner:
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  General         |    Version:  3.0
 Severity:  normal          |   Keywords:  has-patch
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 '''This ticket has 2 purposes:'''

 1) introduces {{{wp_using_ext_object_cache()}}} - mimic
 {{{wp_suspend_cache_invalidation()}}} and disallow direct access to
 {{{$_wp_using_ext_object_cache}}}, cleans up importing of globals in
 functions and provides function to modify that global[[BR]][[BR]]
 2) allows {{{WP_CACHE}}} to load the wp-packaged object cache when
 {{{advanced-cache.php}}} and {{{object-cache.php}}} don't implement
 {{{wp_cache_init()}}}

 When '''define( 'WP_CACHE', true )''':

 As it stands, if you declare {{{WP_CACHE}}} = true, WP will try to load
 {{{advanced-cache.php}}} without checking if the file exists (it does the
 check for {{{object-cache.php}}}). {{{advanced-cache.php}}} shouldn't be
 required. Batcache is awesome, but at its core is just a handler for an
 output buffer. You should be able to mess with {{{object-cache.php}}} and
 not worry about {{{advanced-cache.php}}}. And by worry about I mean, have
 {{{WP_DEBUG}}} on and not get a warning / error.

 {{{wp_start_object_cache()}}}, at its core, is on the hunt for
 {{{wp_cache_init()}}} and then sets the toggle for the external object
 cache. We only care about the external object cache if it has that
 function. Rather than throwing a fatal error if their is a missing method,
 load the default object cache.

 If someone installs Batcache and Memcached properly, then nothing changes
 - files load, all is good. If they install 2 blanks files, the default
 Object Cache will load. If they install an external object cache without
 {{{wp_cache_init()}}}, the default cache loads.

 IMO - there is no reason to turn off non-persistent caching or throw a
 fatal error if the author of a cache plugin sucks or the user made a
 mistake in moving the files.

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Ticket URL: <http://core.trac.wordpress.org/ticket/21401>
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