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<?php
/*
Plugin Name: APC Object Cache
Description: APC backend for the WP Object Cache.
Version: 2.0.3
URI: http://txfx.net/wordpress-plugins/apc/
Author: Mark Jaquith
Author URI: http://coveredwebservices.com/
Install this file to wp-content/object-cache.php
Based on Ryan Boren's Memcached object cache backend
http://wordpress.org/extend/plugins/memcached/
*/
if ( !function_exists( 'apc_fetch' ) ) {
wp_die( 'You do not have APC installed, so you cannot use the APC object cache backend. Please remove the <code>object-cache.php</code> file from your content directory.' );
} elseif ( version_compare( '5.2.4', phpversion(), '>=' ) ) {
wp_die( 'The APC object cache backend requires PHP 5.2 or higher. You are running ' . phpversion() . '. Please remove the <code>object-cache.php</code> file from your content directory.' );
}
// Users with setups where multiple installs share a common wp-config.php can use this
// to guarantee uniqueness for the keys generated by this object cache
if ( !defined( 'WP_APC_KEY_SALT' ) )
define( 'WP_APC_KEY_SALT', 'wp' );
function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->add( $key, $data, $group, $expire );
}
function wp_cache_incr( $key, $n = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->incr2( $key, $n, $group );
}
function wp_cache_decr( $key, $n = 1, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->decr( $key, $n, $group );
}
function wp_cache_close() {
return true;
}
function wp_cache_delete( $key, $group = '' ) {
global $wp_object_cache;
return $wp_object_cache->delete( $key, $group );
}
function wp_cache_flush() {
global $wp_object_cache;
return $wp_object_cache->flush();
}
function wp_cache_get( $key, $group = '', $force = false ) {
global $wp_object_cache;
return $wp_object_cache->get( $key, $group, $force );
}
function wp_cache_init() {
global $wp_object_cache;
$wp_object_cache = new APC_Object_Cache();
}
function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
return $wp_object_cache->replace( $key, $data, $group, $expire );
}
function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
global $wp_object_cache;
if ( defined('WP_INSTALLING') == false )
return $wp_object_cache->set( $key, $data, $group, $expire );
else
return $wp_object_cache->delete( $key, $group );
}
function wp_cache_add_global_groups( $groups ) {
global $wp_object_cache;
$wp_object_cache->add_global_groups( $groups );
}
function wp_cache_add_non_persistent_groups( $groups ) {
global $wp_object_cache;
$wp_object_cache->add_non_persistent_groups( $groups );
}
class WP_Object_Cache {
var $global_groups = array();
var $no_mc_groups = array();
var $cache = array();
var $stats = array( 'get' => 0, 'delete' => 0, 'add' => 0 );
var $group_ops = array();
var $cache_enabled = true;
var $default_expiration = 0;
var $abspath = '';
var $debug = false;
function add( $id, $data, $group = 'default', $expire = 0 ) {
$key = $this->key( $id, $group );
if ( is_object( $data ) )
$data = clone $data;
$store_data = $data;
if ( is_array( $data ) )
$store_data = new ArrayObject( $data );
if ( in_array( $group, $this->no_mc_groups ) ) {
$this->cache[$key] = $data;
return true;
} elseif ( isset( $this->cache[$key] ) && $this->cache[$key] !== false ) {
return false;
}
$expire = ( $expire == 0 ) ? $this->default_expiration : $expire;
$result = apc_add( $key, $store_data, $expire );
if ( false !== $result ) {
@ ++$this->stats['add'];
$this->group_ops[$group][] = "add $id";
$this->cache[$key] = $data;
}
return $result;
}
function add_global_groups( $groups ) {
if ( !is_array( $groups ) )
$groups = (array) $groups;
$this->global_groups = array_merge( $this->global_groups, $groups );
$this->global_groups = array_unique( $this->global_groups );
}
function add_non_persistent_groups( $groups ) {
if ( !is_array( $groups ) )
$groups = (array) $groups;
$this->no_mc_groups = array_merge( $this->no_mc_groups, $groups );
$this->no_mc_groups = array_unique( $this->no_mc_groups );
}
// This is named incr2 because Batcache looks for incr
// We will define that in a class extension if it is available (APC 3.1.1 or higher)
function incr2( $id, $n = 1, $group = 'default' ) {
$key = $this->key( $id, $group );
if ( function_exists( 'apc_inc' ) )
return apc_inc( $key, $n );
else
return false;
}
function decr( $id, $n = 1, $group = 'default' ) {
$key = $this->key( $id, $group );
if ( function_exists( 'apc_dec' ) )
return apc_dec( $id, $n );
else
return false;
}
function close() {
return true;
}
function delete( $id, $group = 'default' ) {
$key = $this->key( $id, $group );
if ( in_array( $group, $this->no_mc_groups ) ) {
unset( $this->cache[$key] );
return true;
}
$result = apc_delete( $key );
@ ++$this->stats['delete'];
$this->group_ops[$group][] = "delete $id";
if ( false !== $result )
unset( $this->cache[$key] );
return $result;
}
function flush() {
// Don't flush if multi-blog.
if ( function_exists( 'is_site_admin' ) || defined( 'CUSTOM_USER_TABLE' ) && defined( 'CUSTOM_USER_META_TABLE' ) )
return true;
return apc_clear_cache( 'user' );
}
function get($id, $group = 'default', $force = false) {
$key = $this->key($id, $group);
if ( isset($this->cache[$key]) && ( !$force || in_array($group, $this->no_mc_groups) ) ) {
if ( is_object( $this->cache[$key] ) )
$value = clone $this->cache[$key];
else
$value = $this->cache[$key];
} else if ( in_array($group, $this->no_mc_groups) ) {
$this->cache[$key] = $value = false;
} else {
$value = apc_fetch( $key );
if ( is_object( $value ) && 'ArrayObject' == get_class( $value ) )
$value = $value->getArrayCopy();
if ( NULL === $value )
$value = false;
$this->cache[$key] = $value;
}
@ ++$this->stats['get'];
$this->group_ops[$group][] = "get $id";
if ( 'checkthedatabaseplease' === $value ) {
unset( $this->cache[$key] );
$value = false;
}
return $value;
}
function key( $key, $group ) {
if ( empty( $group ) )
$group = 'default';
if ( false !== array_search( $group, $this->global_groups ) )
$prefix = $this->global_prefix;
else
$prefix = $this->blog_prefix;
return WP_APC_KEY_SALT . ':' . $this->abspath . ":$prefix$group:$key";
}
function replace( $id, $data, $group = 'default', $expire = 0 ) {
return $this->set( $id, $data, $group, $expire );
}
function set( $id, $data, $group = 'default', $expire = 0 ) {
$key = $this->key( $id, $group );
if ( isset( $this->cache[$key] ) && ('checkthedatabaseplease' === $this->cache[$key] ) )
return false;
if ( is_object( $data ) )
$data = clone $data;
$store_data = $data;
if ( is_array( $data ) )
$store_data = new ArrayObject( $data );
$this->cache[$key] = $data;
if ( in_array( $group, $this->no_mc_groups ) )
return true;
$expire = ( $expire == 0 ) ? $this->default_expiration : $expire;
$result = apc_store( $key, $store_data, $expire );
return $result;
}
function colorize_debug_line( $line ) {
$colors = array(
'get' => 'green',
'set' => 'purple',
'add' => 'blue',
'delete' => 'red');
$cmd = substr( $line, 0, strpos( $line, ' ' ) );
$cmd2 = "<span style='color:{$colors[$cmd]}'>$cmd</span>";
return $cmd2 . substr( $line, strlen( $cmd ) ) . "\n";
}
function stats() {
echo "<p>\n";
foreach ( $this->stats as $stat => $n ) {
echo "<strong>$stat</strong> $n";
echo "<br/>\n";
}
echo "</p>\n";
echo "<h3>APC:</h3>";
foreach ( $this->group_ops as $group => $ops ) {
if ( !isset( $_GET['debug_queries'] ) && 500 < count( $ops ) ) {
$ops = array_slice( $ops, 0, 500 );
echo "<big>Too many to show! <a href='" . add_query_arg( 'debug_queries', 'true' ) . "'>Show them anyway</a>.</big>\n";
}
echo "<h4>$group commands</h4>";
echo "<pre>\n";
$lines = array();
foreach ( $ops as $op ) {
$lines[] = $this->colorize_debug_line($op);
}
print_r($lines);
echo "</pre>\n";
}
if ( $this->debug ) {
$apc_info = apc_cache_info();
echo "<p>";
echo "<strong>Cache Hits:</strong> {$apc_info['num_hits']}<br/>\n";
echo "<strong>Cache Misses:</strong> {$apc_info['num_misses']}\n";
echo "</p>\n";
}
}
function WP_Object_Cache() {
$this->abspath = md5( ABSPATH );
global $blog_id, $table_prefix;
$this->global_prefix = '';
$this->blog_prefix = '';
if ( function_exists( 'is_multisite' ) ) {
$this->global_prefix = ( is_multisite() || defined('CUSTOM_USER_TABLE') && defined('CUSTOM_USER_META_TABLE') ) ? '' : $table_prefix;
$this->blog_prefix = ( is_multisite() ? $blog_id : $table_prefix ) . ':';
}
$this->cache_hits =& $this->stats['get'];
$this->cache_misses =& $this->stats['add'];
}
}
if ( function_exists( 'apc_inc' ) ) {
class APC_Object_Cache extends WP_Object_Cache {
function incr( $id, $n = 1, $group = 'default' ) {
return parent::incr2( $id, $n, $group );
}
}
} else {
class APC_Object_Cache extends WP_Object_Cache {
// Blank
}
}
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