61 lines
1.4 KiB
PHP
61 lines
1.4 KiB
PHP
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<?php
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namespace W3TC;
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/**
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* class Db
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* Database access mediator
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*/
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class DbCache_Wpdb extends DbCache_WpdbBase {
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/**
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* Returns object instance. Called by WP engine
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*
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* @return DbCache_Wpdb
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*/
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static function instance() {
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static $instance = null;
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if ( is_null( $instance ) ) {
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$processors = array();
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$call_default_constructor = true;
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// no caching during activation
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$is_installing = ( defined( 'WP_INSTALLING' ) && WP_INSTALLING );
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$config = Dispatcher::config();
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if ( !$is_installing && $config->get_boolean( 'dbcache.enabled' ) ) {
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$processors[] = new DbCache_WpdbInjection_QueryCaching();
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}
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if ( Util_Environment::is_dbcluster( $config ) ) {
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// dbcluster use mysqli only since other is obsolete now
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if ( !defined( 'WP_USE_EXT_MYSQL' ) ) {
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define( 'WP_USE_EXT_MYSQL', false );
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}
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$processors[] = new Enterprise_Dbcache_WpdbInjection_Cluster();
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}
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$processors[] = new DbCache_WpdbInjection();
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global $wp_version;
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if (version_compare( $wp_version, '5.3') >= 0) {
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$o = new DbCache_WpdbNew( $processors );
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} else {
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$o = new DbCache_WpdbLegacy( $processors );
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}
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$next_injection = new _CallUnderlying( $o );
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foreach ( $processors as $processor ) {
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$processor->initialize_injection( $o, $next_injection );
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}
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// initialize after processors configured
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$o->initialize();
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$instance = $o;
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}
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return $instance;
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}
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}
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