@Override
public Void visit(final DDF_MarketParameter message, final MarketDo market) {
market.clearChanges();
final DDF_ParamType param = message.getParamType();
final TimeValue time = message.getTime();
final TimeValue date = message.getTradeDay().tradeDate();
final DDF_Session ddfSession = message.getSession();
final PriceValue price;