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A bidder joins an auction The sender of the XMPP message identi es the bidder, and the name of the chat session identi es the item
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A bidder sends a bidding price to the auction Auctions send events, which can be:
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Price
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An auction reports the currently accepted price This event also includes the minimum increment that the next bid must be raised by, and the name of bidder who bid this price The auction will send this event to a bidder when it joins and to all bidders whenever a new bid has been accepted
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An auction announces that it has closed The winner of the last price event has won the auction
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A bidder s behavior represented as a state machine
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Getting There Safely We spend some time working through the documentation and talking to Southabee s On-Line support people, and gure out a state machine that shows the transitions a Sniper can make Essentially, a Sniper joins an auction, then there are some rounds of bidding, until the auction closes, at which point the Sniper will have won or lost; see Figure 93 We ve left out the stop price for now to keep things simple; it ll turn up in 18
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Southabee s On-Line has also sent us details of the formats they use within the XMPP messages They re pretty simple, since they only involve a few names and values, and are serialized in a single line with key/value pairs Each line starts with a version number for the protocol itself The messages look like this:
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SOLVersion: SOLVersion: SOLVersion: SOLVersion: 11; 11; 11; 11; Command: JOIN; Event: PRICE; CurrentPrice: 192; Increment: 7; Bidder: Someone else; Command: BID; Price: 199; Event: CLOSE;
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Southabee s On-Line uses login names to identify items for sale, so to bid for an item with identi er 12793, a client would start a chat with the user auction-12793 at the Southabee s server The server can tell who is bidding from the identity of the caller, assuming the accounts have been set up beforehand
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Even a small application like this is too large to write in one go, so we need to gure out, roughly, the steps we might take to get there A critical technique with incremental development is learning how to slice up the functionality so that it can be built a little at a time Each slice should be signi cant and concrete enough that the team can tell when it s done, and small enough to be focused on one concept and achievable quickly Dividing our work into small, coherent chunks also helps us manage the development risk We get regular, concrete feedback on the progress we re making, so we can adjust our plan as the team discovers more about the domain and the technologies Our immediate task is to gure out a series of incremental development steps for the Sniper application The rst is absolutely the smallest feature we can build, the walking skeleton we described in First, Test a Walking Skeleton (page 32) Here, the skeleton will cut a minimum path through Swing, XMPP, and our application; it s just enough to show that we can plug these components together Each subsequent step adds a single element of complexity to the existing application, building on the work that s done before After some discussion, we come up with this sequence of features to build:
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Single item: join, lose without bidding This is our starting case where we put together the core infrastructure; it is the subject of 10 Single item: join, bid, and lose Add bidding to the basic connectivity Single item: join, bid, and win Distinguish who sent the winning bid Show price details Start to fill out the user interface Multiple items Support bidding for multiple items in the same application Add items through the user interface Implement input via the user interface Stop bidding at the stop price More intelligence in the Sniper algorithm Within the list, the buyers have prioritized the user interface over the stop price, partly because they want to make sure they ll feel comfortable with the application and partly because there won t be an easy way to add multiple items, each with its own stop price, without a user interface Once this is stable, we can work on more complicated scenarios, such as retrying if a bid failed or using different strategies for bidding For now, implementing just these features should keep us busy
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