# (Optional) Extend the consumer
<a name="tutorial-stock-data-kplkcl-consumer-extension"></a>

The application in the [Tutorial: Process real-time stock data using KPL and KCL 1.x[Tutorial: Process real-time stock data using KPL and KCL 1.x](tutorial-stock-data-kplkcl.md)](tutorial-stock-data-kplkcl.md) might already be sufficient for your purposes. This optional section shows how you can extend the consumer code for a slightly more elaborate scenario.

If you want to know about the biggest sell orders each minute, you can modify the `StockStats` class in three places to accommodate this new priority.

**To extend the consumer**

1. Add new instance variables:

   ```
    // Ticker symbol of the stock that had the largest quantity of shares sold 
    private String largestSellOrderStock;
    // Quantity of shares for the largest sell order trade
    private long largestSellOrderQuantity;
   ```

1. Add the following code to `addStockTrade`:

   ```
    if (type == TradeType.SELL) {
        if (largestSellOrderStock == null || trade.getQuantity() > largestSellOrderQuantity) {
            largestSellOrderStock = trade.getTickerSymbol();
            largestSellOrderQuantity = trade.getQuantity();
        }
    }
   ```

1. Modify the `toString` method to print the additional information:

   ```
    public String toString() {
        return String.format(
                "Most popular stock being bought: %s, %d buys.%n" +
                "Most popular stock being sold: %s, %d sells.%n" +
                "Largest sell order: %d shares of %s.",
                getMostPopularStock(TradeType.BUY), getMostPopularStockCount(TradeType.BUY),
                getMostPopularStock(TradeType.SELL), getMostPopularStockCount(TradeType.SELL),
                largestSellOrderQuantity, largestSellOrderStock);
    }
   ```

If you run the consumer now (remember to run the producer also), you should see output similar to this:

```
 ****** Shard shardId-000000000001 stats for last 1 minute ******
  Most popular stock being bought: WMT, 27 buys.
  Most popular stock being sold: PTR, 14 sells.
  Largest sell order: 996 shares of BUD.
  ****************************************************************
```

## Next steps
<a name="tutorial-stock-data-kplkcl-consumer-extension-next"></a>

[Clean up resources](tutorial-stock-data-kplkcl-finish.md)