public void enterOrder(Order order, String instrument) {
    books
        .get(instrument)
        .enter(order.id(), order.level().side(), order.level().price(), order.size());
  }
public void enterOrder ( Order order , String instrument ) { books . get ( instrument ) . enter ( order . id ( ) , order . level ( ) . side ( ) , order . level ( ) . price ( ) , order . size ( ) ) ; }
Fake <code>enterOrder</code> implementation.