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Our end-to-end test passes, but we haven t nished because our new implementation feels messy We notice that the activity in joinAuction() crosses multiple domains: managing chats, sending bids, creating snipers, and so on We need to clean up To start, we notice that we re sending auction commands from two different levels, at the top and from within the Auction Sending commands to an auction sounds like the sort of thing that our Auction object should do, so it makes sense to package that up together We add a new method to the interface, extend our anonymous implementation, and then extract it to a (temporarily) nested class for which we need a name The distinguishing feature of this implementation of Auction is that it s based on the messaging infrastructure, so we call our new class XMPPAuction
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public class Main implements SniperListener { [ ] private void joinAuction(XMPPConnection connection, String itemId) { disconnectWhenUICloses(connection); final Chat chat = connectiongetChatManager()createChat(auctionId(itemId, connection), null); thisnotToBeGCd = chat; Auction auction = new XMPPAuction(chat); chataddMessageListener( new AuctionMessageTranslator(new AuctionSniper(auction, this))); auctionjoin(); } public static class XMPPAuction implements Auction { private final Chat chat; public XMPPAuction(Chat chat) { thischat = chat; } public void bid(int amount) { sendMessage(format(BID_COMMAND_FORMAT, amount)); } public void join() { sendMessage(JOIN_COMMAND_FORMAT); } private void sendMessage(final String message) { try { chatsendMessage(message); } catch (XMPPException e) { eprintStackTrace(); } } } }
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We re starting to see a clearer model of the domain The line auctionjoin() expresses our intent more clearly than the previous detailed implementation of sending a string to a chat The new design looks like Figure 134 and we promote XMPPAuction to be a top-level class We still think joinAuction() is unclear, and we d like to pull the XMPP-related detail out of Main, but we re not ready to do that yet Another point to keep in mind
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The other activity in Main is implementing the user interface and showing the current state in response to events from the Sniper We re not really happy that Main implements SniperListener; again, it feels like mixing different responsibilities (starting the application and responding to events) We decide to extract the SniperListener behavior into a nested helper class, for which the best name we can nd is SniperStateDisplayer This new class is our bridge between two domains: it translates Sniper events into a representation that Swing can display, which includes dealing with Swing threading We plug an instance of the new class into the AuctionSniper
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public class Main { // doesn't implement SniperListener private MainWindow ui; private void joinAuction(XMPPConnection connection, String itemId) { disconnectWhenUICloses(connection); final Chat chat = connectiongetChatManager()createChat(auctionId(itemId, connection), null); thisnotToBeGCd = chat; Auction auction = new XMPPAuction(chat); chataddMessageListener( new AuctionMessageTranslator( connectiongetUser(), new AuctionSniper(auction, new SniperStateDisplayer()))); auctionjoin(); } [ ]
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public class SniperStateDisplayer implements SniperListener { public void sniperBidding() { showStatus(MainWindowSTATUS_BIDDING); } public void sniperLost() { showStatus(MainWindowSTATUS_LOST); } public void sniperWinning() { showStatus(MainWindowSTATUS_WINNING); } private void showStatus(final String status) { SwingUtilitiesinvokeLater(new Runnable() { public void run() { uishowStatus(status); } }); } } }
Figure 135 shows how we ve reduced Main so much that it no longer participates in the running application (for clarity, we ve left out the WindowAdapter that closes the connection) It has one job which is to create the various components and introduce them to each other We ve marked MainWindow as external, even though it s one of ours, to represent the Swing framework
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promise to ourselves and return to the We start trying to reduce the noise by adding constants and static imports, with some helper methods to reduce duplication Then we realize that much of the code is about manipulating the map of name/value pairs and is rather procedural We can do a better job by extracting an inner class, AuctionEvent, to encapsulate the unpacking of the message contents We have con dence that we can refactor the class safely because it s protected by its unit tests