LBFactory_Single.php

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<?php
class LBFactory_Single extends LBFactory {
        protected $lb;

        function __construct( $conf ) {
                $this->lb = new LoadBalancer_Single( $conf );
        }

        function newMainLB( $wiki = false ) {
                return $this->lb;
        }

        function getMainLB( $wiki = false ) {
                return $this->lb;
        }

        function newExternalLB( $cluster, $wiki = false ) {
                return $this->lb;
        }

        function &getExternalLB( $cluster, $wiki = false ) {
                return $this->lb;
        }

        function forEachLB( $callback, $params = array() ) {
                call_user_func_array( $callback, array_merge( array( $this->lb ), $params ) );
        }
}

class LoadBalancer_Single extends LoadBalancer {

        var $db;

        function __construct( $params ) {
                $this->db = $params['connection'];
                parent::__construct( array( 'servers' => array( array(
                        'type' => $this->db->getType(),
                        'host' => $this->db->getServer(),
                        'dbname' => $this->db->getDBname(),
                        'load' => 1,
                ) ) ) );
        }

        function reallyOpenConnection( $server, $dbNameOverride = false ) {
                return $this->db;
        }
}