LBFactorySingle.php

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

    function __construct( $conf ) {
        $this->lb = new LoadBalancerSingle( $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 LoadBalancerSingle extends LoadBalancer {
    protected $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;
    }
}