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The Sniper Makes a Bid
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In which we extract an AuctionSniper class and tease out its dependencies We plug our new class into the rest of the application, using an empty implementation of auction until we re ready to start sending commands We close the loop back to the auction house with an XMPPAuction class We continue to carve new types out of the code
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Introducing AuctionSniper
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A New Class, with Dependencies
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Our application accepts Price events from the auction, but cannot interpret them yet We need code that will perform two actions when the currentPrice() method is called: send a higher bid to the auction and update the status in the user interface We could extend Main, but that class is looking rather messy it s already doing too many things at once It feels like this is a good time to introduce what we should call an Auction Sniper, the component at the heart of our application, so we create an AuctionSniper class Some of its intended behavior is currently buried in Main, and a good start would be to extract it into our new class although, as we ll see in a moment, it will take a little effort Given that an AuctionSniper should respond to Price events, we decide to make it implement AuctionEventListener rather than Main The question is what to do about the user interface If we consider moving this method:
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public void auctionClosed() { SwingUtilitiesinvokeLater(new Runnable() { public void run() { uishowStatus(MainWindowSTATUS_LOST); } }); }
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does it really make sense for an AuctionSniper to know about the implementation details of the user interface, such as the use of the Swing thread We d be at risk of breaking the single responsibility principle again Surely an AuctionSniper ought to be concerned with bidding policy and only notify status changes in its terms
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The Sniper Makes a Bid
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Our solution is to insulate the AuctionSniper by introducing a new relationship: it will notify a SniperListener of changes in its status The interface and the rst unit test look like this:
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public interface SniperListener extends EventListener { void sniperLost(); } @RunWith(JMockclass) public class AuctionSniperTest { private final Mockery context = new Mockery(); private final SniperListener sniperListener = contextmock(SniperListenerclass); private final AuctionSniper sniper = new AuctionSniper(sniperListener); @Test public void reportsLostWhenAuctionCloses() { contextchecking(new Expectations() {{ one(sniperListener)sniperLost(); }}); sniperauctionClosed(); } }
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which says that Sniper should report that it has lost if it receives a Close event from the auction The failure report says:
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not all expectations were satisfied expectations: ! expected exactly 1 time, never invoked: SniperListenersniperLost();
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public class AuctionSniper implements AuctionEventListener { private final SniperListener sniperListener; public AuctionSniper(SniperListener sniperListener) { thissniperListener = sniperListener; } public void auctionClosed() { sniperListenersniperLost(); } public void currentPrice(int price, int increment) { // TODO Auto-generated method stub } }
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Finally, we retro t the new AuctionSniper by having Main implement
SniperListener
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Introducing AuctionSniper
public class Main implements SniperListener { [ ] private void joinAuction(XMPPConnection connection, String itemId) throws XMPPException { disconnectWhenUICloses(connection); Chat chat = connectiongetChatManager()createChat( auctionId(itemId, connection), new AuctionMessageTranslator(new AuctionSniper(this))); thisnotToBeGCd = chat; chatsendMessage(JOIN_COMMAND_FORMAT); } public void sniperLost() { SwingUtilitiesinvokeLater(new Runnable() { public void run() { uishowStatus(MainWindowSTATUS_LOST); } }); } }
Our working end-to-end test still passes and our broken one still fails at the same place, so we haven t made things worse The new structure looks like Figure 131
Plugging in the AuctionSniper
Focus, Focus, Focus
Once again, we ve noticed complexity in a class and used that to tease out a new concept from our initial skeleton implementation Now we have a Sniper to respond to events from the translator As you ll see shortly, this is a better structure for expressing what the code does and for unit testing We also think that the sniperLost() method is clearer than its previous incarnation, auctionClosed(), since there s now a closer match between its name and what it does that is, reports a lost auction Isn t this wasteful ddling, gold-plating the code while time slips by Obviously we don t think so, especially when we re sorting out our ideas this early in the project There are teams that overdo their design effort, but our experience is that most teams spend too little time clarifying the code and pay for it in maintenance overhead As we ve shown a couple of times now, the single responsibility principle is a very effective heuristic for breaking up complexity, and