Use cache to speed up your wordpress on Aliyun ACE.

object-cache.php

<?php
/*
I have changed it to use in Aliyun ACE.
Please keep attention.
More information -> http://yii.im/posts/how-to-use-cache-to-speed-up-your-wordpress-on-aliyun-ace
Modify by Ivan Chou at 01/07/2014
*/

/*
Plugin Name: Memcached
Description: Memcached backend for the WP Object Cache.
Version: 2.0.2
Plugin URI: http://wordpress.org/extend/plugins/memcached/
Author: Ryan Boren, Denis de Bernardy, Matt Martz

Install this file to wp-content/object-cache.php
*/

if ( class_exists('Alibaba') ) {
    
    // Users with setups where multiple installs share a common wp-config.php or $table_prefix
    // can use this to guarantee uniqueness for the keys generated by this object cache
    if ( !defined( 'WP_CACHE_KEY_SALT' ) )
        define( 'WP_CACHE_KEY_SALT', '' );

    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 $wp_object_cache->incr($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() {
        global $wp_object_cache;

        return $wp_object_cache->close();
    }

    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 WP_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 $mc = array();
        var $stats = array();
        var $group_ops = array();

        var $cache_enabled = true;
        var $default_expiration = 0;

        function add($id, $data, $group = 'default', $expire = 0) {
            $key = $this->key($id, $group);

            if ( is_object( $data ) )
                $data = clone $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;
            }

            $mc =& $this->get_mc($group);
            $expire = ($expire == 0) ? $this->default_expiration : $expire;
            $result = $mc->add($key, $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);
        }

        function incr($id, $n = 1, $group = 'default' ) {
            $key = $this->key($id, $group);
            $mc =& $this->get_mc($group);
            $this->cache[ $key ] = $mc->increment( $key, $n );	
            return $this->cache[ $key ];
        }

        function decr($id, $n = 1, $group = 'default' ) {
            $key = $this->key($id, $group);
            $mc =& $this->get_mc($group);
            $this->cache[ $key ] = $mc->decrement( $key, $n );
            return $this->cache[ $key ];
        }

        function close() {

        }

        function delete($id, $group = 'default') {
            $key = $this->key($id, $group);

            if ( in_array($group, $this->no_mc_groups) ) {
                unset($this->cache[$key]);
                return true;
            }

            $mc =& $this->get_mc($group);

            $result = $mc->delete($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;

            $ret = true;
            foreach ( array_keys($this->mc) as $group )
                $ret &= $this->mc[$group]->flush();
            return $ret;
        }

        function get($id, $group = 'default', $force = false) {
            $key = $this->key($id, $group);
            $mc =& $this->get_mc($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 = $mc->get($key);
                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 get_multi( $groups ) {
            /*
            format: $get['group-name'] = array( 'key1', 'key2' );
            */
            $return = array();
            foreach ( $groups as $group => $ids ) {
                $mc =& $this->get_mc($group);
                foreach ( $ids as $id ) {
                    $key = $this->key($id, $group);
                    if ( isset($this->cache[$key]) ) {
                        if ( is_object( $this->cache[$key] ) )
                            $return[$key] = clone $this->cache[$key];
                        else
                            $return[$key] = $this->cache[$key];
                        continue;
                    } else if ( in_array($group, $this->no_mc_groups) ) {
                        $return[$key] = false;
                        continue;
                    } else {
                        $return[$key] = $mc->get($key);
                    }
                }
                if ( $to_get ) {
                    $vals = $mc->get_multi( $to_get );
                    $return = array_merge( $return, $vals );
                }
            }
            @ ++$this->stats['get_multi'];
            $this->group_ops[$group][] = "get_multi $id";
            $this->cache = array_merge( $this->cache, $return );
            return $return;
        }

        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 preg_replace('/\s+/', '', WP_CACHE_KEY_SALT . "$prefix$group:$key");
        }

        function replace($id, $data, $group = 'default', $expire = 0) {
            $key = $this->key($id, $group);
            $expire = ($expire == 0) ? $this->default_expiration : $expire;
            $mc =& $this->get_mc($group);

            if ( is_object( $data ) )
                $data = clone $data;

            $result = $mc->replace($key, $data, $expire);
            if ( false !== $result )
                $this->cache[$key] = $data;
            return $result;
        }

        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;

            $this->cache[$key] = $data;

            if ( in_array($group, $this->no_mc_groups) )
                return true;

            $expire = ($expire == 0) ? $this->default_expiration : $expire;
            $mc =& $this->get_mc($group);
            $result = $mc->set($key, $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>Memcached:</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 ( $this->debug )
                var_dump($this->memcache_debug);
        }

        function &get_mc($group) {
            if ( isset($this->mc) )
                return $this->mc;
            return $this->mc['default'];
        }

        function __construct() {
            $this->mc =& Alibaba::Cache();
            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'];
        }
    }
    
}
?>