// Interested in the public polling market data feed (no authentication).
PollingMarketDataService marketDataService = exchange.getPollingMarketDataService();
// Get the order book data for BTC/CNY.
OrderBook orderBook = marketDataService.getOrderBook(CurrencyPair.BTC_CNY);
System.out.println(orderBook);
System.out.println("asks: " + orderBook.getAsks());
System.out.println("bids: " + orderBook.getBids());
System.out.println("size: " + (orderBook.getAsks().size() + orderBook.getBids().size()));
}