/**
* Returns onject instance. Called by WP engine
*
* @return W3_Db
*/
static function instance()
{
static $instances = array();
if (!isset($instances[0])) {
$processors = array();
$call_default_constructor = true;
// no caching during activation
$is_installing = defined('WP_INSTALLING') && WP_INSTALLING;
$config = w3_instance('W3_Config');
if (!$is_installing && $config->get_boolean('dbcache.enabled')) {
$processors[] = w3_instance('W3_DbCache');
}
if (w3_is_dbcluster()) {
$processors[] = w3_instance('W3_Enterprise_DbCluster');
}
$processors[] = new W3_DbProcessor();
$class = __CLASS__;
$o = new $class($processors);
$underlying_manager = new W3_DbCallUnderlying($o);
foreach ($processors as $processor) {
$processor->manager = $o;
$processor->underlying_manager = $underlying_manager;
}
// initialize after processors configured
$o->initialize();
@($instances[0] = $o);
}
return $instances[0];
}
/**
* Database cluster config editor
*
* @return void
*/
function dbcluster_config()
{
$this->_page = 'w3tc_dbcluster_config';
if (w3_is_dbcluster()) {
$content = @file_get_contents(W3TC_FILE_DB_CLUSTER_CONFIG);
} else {
$content = @file_get_contents(W3TC_DIR . '/ini/dbcluster-config-sample.php');
}
include W3TC_INC_OPTIONS_DIR . '/enterprise/dbcluster-config.php';
}
/**
* Check if we can do modify contents
*
* @return boolean
*/
function can_ob()
{
global $w3_late_init;
$enabled = w3_is_preview_mode();
$enabled = $enabled || $this->_config->get_boolean('pgcache.enabled');
$enabled = $enabled || $this->_config->get_boolean('dbcache.enabled');
$enabled = $enabled || $this->_config->get_boolean('objectcache.enabled');
$enabled = $enabled || $this->_config->get_boolean('browsercache.enabled');
$enabled = $enabled || $this->_config->get_boolean('minify.enabled');
$enabled = $enabled || $this->_config->get_boolean('cdn.enabled');
$enabled = $enabled || $this->_config->get_boolean('fragmentcache.enabled');
$enabled = $enabled || w3_is_dbcluster();
$enabled = $enabled && !$w3_late_init;
/**
* Check if plugin enabled
*/
if (!$enabled) {
return false;
}
/**
* Skip if admin
*/
if (defined('WP_ADMIN')) {
return false;
}
/**
* Skip if doing AJAX
*/
if (defined('DOING_AJAX')) {
return false;
}
/**
* Skip if doing cron
*/
if (defined('DOING_CRON')) {
return false;
}
/**
* Skip if APP request
*/
if (defined('APP_REQUEST')) {
return false;
}
/**
* Skip if XMLRPC request
*/
if (defined('XMLRPC_REQUEST')) {
return false;
}
/**
* Check for WPMU's and WP's 3.0 short init
*/
if (defined('SHORTINIT') && SHORTINIT) {
return false;
}
/**
* Check User Agent
*/
if (isset($_SERVER['HTTP_USER_AGENT']) && stristr($_SERVER['HTTP_USER_AGENT'], W3TC_POWERED_BY) !== false) {
return false;
}
return true;
}
define('W3TC_DIR', WP_CONTENT_DIR . '/plugins/w3-total-cache');
}
/**
* Abort W3TC loading if WordPress is upgrading
*/
if (!@is_dir(W3TC_DIR) || !file_exists(W3TC_DIR . '/inc/define.php')) {
if (!defined('WP_ADMIN')) {
// lets don't show error on front end
require_once ABSPATH . WPINC . '/wp-db.php';
} else {
@header('HTTP/1.1 503 Service Unavailable');
die(sprintf('<strong>W3 Total Cache Error:</strong> some files appear to be missing or out of place. Please re-install plugin or remove <strong>%s</strong>.', __FILE__));
}
} else {
require_once W3TC_DIR . '/inc/define.php';
// no caching during activation
$is_installing = defined('WP_INSTALLING') && WP_INSTALLING;
$config = w3_instance('W3_Config');
if (!$is_installing && $config->get_boolean('dbcache.enabled') || w3_is_dbcluster()) {
if (defined('DB_TYPE')) {
$db_driver_path = sprintf('%s/Db/%s.php', W3TC_LIB_W3_DIR, DB_TYPE);
if (file_exists($db_driver_path)) {
require_once $db_driver_path;
} else {
die(sprintf('<strong>W3 Total Cache Error:</strong> database driver doesn\'t exist: %s.', $db_driver_path));
}
}
w3_require_once(W3TC_LIB_W3_DIR . '/Db.php');
$GLOBALS['wpdb'] = W3_Db::instance();
}
}
<tr>
<th><label for="w3tc_dbcluster_config">Database cluster:</th>
<td>
<input type="submit" id="w3tc_dbcluster_config" name="w3tc_dbcluster_config" class="button"
value="<?php
echo w3_is_dbcluster() ? 'Edit Database Cluster Configuration' : 'Enable database cluster';
?>
" /><br />
<span class="description">Create db-cluster-config.php file with your database cluster configuration to enable it.</span>
</td>
</tr>
