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msigleymsigley
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Initial release.
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‎wp-simple-object-cache/lib/apc/object-cache.php

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

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