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With an acceptance test to show us where we want to get to, we can ll in the steps along the way As usual, we work outside-in, from the event that triggers the behavior; in this case it s a price update from Southabee s On-Line Following along the sequence of method calls, we don t have to change AuctionMessageTranslator, so we start by looking at AuctionSniper and its unit tests AuctionSniper noti es changes in its state to neighbors that implement the SniperListener interface which, as you might remember, has four callback methods, one for each state of the Sniper Now we also need to pass in the current state of the Sniper when we notify a listener We could add the same set of arguments to each method, but that would be duplication; so, we introduce a value type to carry the Sniper s state This is an example of bundling up that we described in Value Types (page 59) Here s a rst cut:
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public class SniperState { public final String itemId; public final int lastPrice; public final int lastBid; public SniperState(String itemId, int lastPrice, int lastBid) { thisitemId = itemId; thislastPrice = lastPrice; thislastBid = lastBid; } }
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To save effort, we use the re ective builders from the Apache commonslang library to implement equals(), hashCode(), and toString() in the new class We could argue that we re being premature with these features, but in practice we ll need them in a moment when we write our unit tests
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We ve adopted a habit of using public nal elds in value types, at least while we re in the process of sorting out what the type should do It makes it obvious that the value is immutable and reduces the overhead of maintaining getters when the class isn t yet stable Our ambition, which we might not achieve, is to replace all eld access with meaningful action methods on the type We ll see how that pans out
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We don t want to break all the tests at once, so we start with an easy one In this test there s no history, all we have to do in the Sniper is construct a SniperState from information available at the time and pass it to the listener
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public class AuctionSniperTest { [ ] @Test public void bidsHigherAndReportsBiddingWhenNewPriceArrives() { final int price = 1001; final int increment = 25; final int bid = price + increment; contextchecking(new Expectations() {{ one(auction)bid(bid); atLeast(1)of(sniperListener)sniperBidding( new SniperState(ITEM_ID, price, bid)); }}); snipercurrentPrice(price, increment, PriceSourceFromOtherBidder); } }
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Then we make the test pass:
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public class AuctionSniper implements AuctionEventListener { [ ] public void currentPrice(int price, int increment, PriceSource priceSource) { isWinning = priceSource == PriceSourceFromSniper; if (isWinning) { sniperListenersniperWinning(); } else { int bid = price + increment; auctionbid(bid); sniperListenersniperBidding(new SniperState(itemId, price, bid)); } } }
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sniperBidding() method in SniperStateDisplayer, SniperListener, but don t yet do anything with it
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To get the code to compile, we also add the state argument to the which implements
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The one signi cant change is that the Sniper needs access to the item identi er so it can construct a SniperState Given that the Sniper doesn t need this value for any other reason, we could have kept it in the SniperStateDisplayer and added it in when an event passes through, but we think it s reasonable that the Sniper has access to this information We decide to pass the identi er into the AuctionSniper constructor; it s available at the time, and we don t want to get it from the Auction object which may have its own form of identi er for an item We have one other test that refers to the sniperBidding() method, but only as an allowance We use a matcher that says that, since it s only supporting the interesting part of the test, we don t care about the contents of the state object
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allowing(sniperListener)sniperBidding(with(any(SniperStateclass)));
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