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Observations formalism often means we can clean up a lucky-dip of snippets of behavior scattered across the code What s nice about state transitions diagrams is that they map directly onto tests, so we can show that we ve covered all the possibilities The trick is to understand and use other modeling techniques for support and guidance, not as an end in themselves which is how they got a bad name in the rst place When we re doing TDD and we re uncertain what to do, sometimes stepping back and opening a pack of index cards, or sketching out the interactions, can help us regain direction
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The string is a stark data structure and everywhere it is passed there is much duplication of process It is a perfect vehicle for hiding information Alan Perlis
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Looking back, we wish we d created the Item type earlier, probably when we extracted UserRequestListener, instead of just using a String to represent the thing a Sniper bids for Had we done so, we could have added the stop price to the existing Item class, and it would have been delivered, by de nition, to where it was needed We might also have noticed sooner that we do not want to index our table on item identi er but on an Item, which would open up the possibility of trying multiple policies in a single auction We re not saying that we should have designed more speculatively for a need that hasn t been proved Rather, when we take the trouble to express the domain clearly, we often nd that we have more options It s often better to de ne domain types to wrap not only Strings but other built-in types too, including collections All we have to do is remember to apply our own advice As you see, sometimes we forget
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In which we address the reality of programming in an imperfect world, and add failure reporting We add a new auction event that reports failure We attach a new event listener that will turn off the Sniper if it fails We also write a message to a log and write a unit test that mocks a class, for which we re very sorry To avoid trying your patience any further, we close our example here
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So far, we ve been prepared to assume that everything just works This might be reasonable if the application is not supposed to last perhaps it s acceptable if it just crashes and we restart it or, as in this case, we ve been mainly concerned with demonstrating and exploring the domain Now it s time to start being explicit about how we deal with failures
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Our product people are concerned that Southabee s On-Line has a reputation for occasionally failing and sending incorrectly structured messages, so they want us to show that we can cope It turns out that the system we talk to is actually an aggregator for multiple auction feeds, so the failure of an individual auction does not imply that the whole system is unsafe Our policy will be that when we receive a message that we cannot interpret, we will mark that auction as Failed and ignore any further updates, since it means we can no longer be sure what s happening Once an auction has failed, we make no attempt to recover1 In practice, reporting a message failure means that we ush the price and bid values, and show the status as Failed for the offending item We also record the event somewhere so that we can deal with it later We could make the display of the failure more obvious, for example by coloring the row, but we ll keep this version simple and leave any extras as an exercise for the reader The end-to-end test shows that a working Sniper receives a bad message, displays and records the failure, and then ignores further updates from this auction:
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1 We admit that it s unlikely that an auction site that regularly garbles its messages will survive for long, but it s a simple example to work through We also doubt that any serious bidder will be happy to let their bid lie hanging, not knowing whether they ve bought something or lost to a rival On the other hand, we ve seen less plausible systems succeed in the world, propped up by an army of special handling, so perhaps you can let us get away with this one
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