ConfigFactory.php

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<?php

class ConfigFactory {

    protected $factoryFunctions = array();

    protected $configs = array();

    private static $self;

    public static function getDefaultInstance() {
        if ( !self::$self ) {
            self::$self = new self;
            global $wgConfigRegistry;
            foreach ( $wgConfigRegistry as $name => $callback ) {
                self::$self->register( $name, $callback );
            }
        }
        return self::$self;
    }

    public static function destroyDefaultInstance() {
        if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
            throw new MWException( __METHOD__ . ' was called outside of unit tests' );
        }

        self::$self = null;
    }

    public function register( $name, $callback ) {
        if ( !is_callable( $callback ) ) {
            throw new InvalidArgumentException( 'Invalid callback provided' );
        }
        $this->factoryFunctions[$name] = $callback;
    }

    public function makeConfig( $name ) {
        if ( !isset( $this->configs[$name] ) ) {
            if ( !isset( $this->factoryFunctions[$name] ) ) {
                throw new ConfigException( "No registered builder available for $name." );
            }
            $conf = call_user_func( $this->factoryFunctions[$name], $this );
            if ( $conf instanceof Config ) {
                $this->configs[$name] = $conf;
            } else {
                throw new UnexpectedValueException( "The builder for $name returned a non-Config object." );
            }
        }

        return $this->configs[$name];
    }
}