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It s certainly not immediately obvious from looking at the code (which we ll get to very soon), but the rather dysfunctional example in this chapter is intended to be a price calculator that finds specific hotels in a database and then calculates how much it would cost to stay at that hotel for n nights. The price may fluctuate (admittedly not as much as, say, a Forex price feed), but the coders saw fit to add in a live hotel price streamer. This streamer listens to an external price streaming service, and feeds the results back into the hotel price calculator. To map things out a little and provide a big picture, Figure 9 1 shows a UML class diagram with all of the classes and their tangle of relationships. We re sure you ve felt that moment of creeping dread when you know that you re about to dive into a particularly nasty area of legacy code, like plunging into a black tunnel, a deep crypt where untold horrors may lurk. It s because of this feeling that we refer to the code in this chapter as the Temple of Doom.
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CHAPTER 9 UNIT TESTING ANTIPATTERNS (THE DON TS )
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Figure 9 1. Dare you enter the Temple of Doom Over the next few pages we lay out all of the Temple of Doom in its inglorious horror. If you see code swimming before your eyes, feel free to skip this section it s mainly just there for the shock factor anyway as we ll present the relevant snippets of the code as we explore each antipattern. So duck under your adventurer s fedora hat and take a swig from your authentic stitchedcamelhide water bottle, as you enter the Temple of Doom (if you dare), where programmers were sacrificed to Quetzalcoatl, the ancient Mayan god of refactoring.
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The HotelPriceCalculator Class
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As you step trepidatiously into the outer crypt of this legacy hellhole, rays of sunlight from the crumbling doorway play across the main class, HotelPriceCalculator. Here s the code for the class: package com.softwarereality.nottherealmapplet; import java.math.BigDecimal; import java.util.*; import java.util.logging.*; public class HotelPriceCalculator extends HotelCollection
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CHAPTER 9 UNIT TESTING ANTIPATTERNS (THE DON TS )
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implements PriceListener { static Logger logger; static final HotelPriceCalculator nyInstance = new HotelPriceCalculator(null); final PriceStreamer priceStreamer = PriceStreamer.getInstance(); static List<Hotel> nyHotels; static { try { logger = Logger.getLogger("not.the.real.mapplet"); PriceStreamer.getInstance().addListener(nyInstance); nyHotels = ((HotelDB) OracleManager.getDao(HotelDB.class)).searchFor("New York"); } catch (Exception e) { // fail silently } } public HotelPriceCalculator(Object ... hotelIDs) { super(logger); try { PriceStreamer.getInstance().addListener(this); // many lines of code to load up a list of Hotels from the DB: Map<Object, Hotel> hotelsByID = new HashMap<Object, Hotel>(hotelIDs.length); DAO db = OracleManager.getDao(HotelDB.class); for (Object id : hotelIDs) { Hotel hotel = (Hotel) db.find(id); hotelsByID.put(id, hotel); } super.setHotels(hotelsByID); } catch (Exception e) { logger.log(Level.SEVERE, "Error initialising", e); }
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public BigDecimal calculatePrice(Hotel hotel, int numNights) { Object id = hotel.getId(); BigDecimal pricePerNight = priceStreamer.quotePrice(id); return pricePerNight.multiply(new BigDecimal(numNights)); } // "Just in case" code - why 5 nights Uncompleted task // Programmer's thought in progress 1 Bad dream public void priceUpdate(Object id, BigDecimal price) { try { DAO db = OracleManager.getDao(HotelDB.class);
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CHAPTER 9 UNIT TESTING ANTIPATTERNS (THE DON TS )
Hotel hotel = (Hotel) db.find(id); calculatePrice(hotel, 5); } catch (Exception e) { logger.log(Level.SEVERE, "Error updating hotel price", e); }
Supporting Classes
Going deeper into the mostly silent crypts, pausing only to wonder if that was the ghostly sound of a centuries-old sacrificial victim, or just the wind blowing through the oppressive tunnel, you peer through the flickering torchlight at HotelPriceCalculator s parent class, HotelCollection: public class HotelCollection { private Logger l; private List<Hotel> hotels; Map<Object, Hotel> hotelsByID; public HotelCollection(Logger l) { this.l = l; } public void setHotels(Map<Object, Hotel> hotelsByID) { this.hotelsByID = hotelsByID; this.hotels = new ArrayList<Hotel>(hotelsByID.values()); }
You ll see the next class, Hotel, used quite a bit throughout the code. It s rather central to the code s operations, though you wouldn t think so by looking at it. For such an important class, there s not very much to it, but here it is: public class Hotel { private boolean hotelDetailsFound; private Object id; public Hotel() {} public Hotel(Object id) { this.id = id; } public void setId(Object id) { this.id = id; } public Object getId() { return id; } public static Hotel search(String city, String street) { try { List<Hotel> foundList = OracleManager.getDao().searchFor(city, street); if (foundList.size() == 0) { Hotel notFound = new Hotel(); notFound.hotelDetailsFound = false;
CHAPTER 9 UNIT TESTING ANTIPATTERNS (THE DON TS )
return notFound; } Hotel found = foundList.get(0); found.hotelDetailsFound = true; return found; } catch (Exception e) { e.printStackTrace(); return null; }
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