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Figure 12 1. Robustness diagram for Use Address We ll zero in on one of the controllers shortly, but the activity diagram actually covers four of the controllers: Geocode location, How many candidates were found , Set AOI, and Display Address Candidate widget.
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The system geocodes the address using ESRI s Geocoding Service, then checks to see how many candidate hotels were returned. If none, then a separate service the POI Locator Service is given a try. If any hotels were found, the AOI ( Area Of Interest ) is set around the address candidate; if more than one hotel was found, the address candidates are listed in the Search Widget. Collectively, this small group of controllers is a subsystem that should get more attention in the detailed design. Much of this design detail could be added to the original sequence diagram, as it falls outside the remit of an algorithm test. However, we ll focus on the How many candidates were found controller (in which there s some deceptively complex logic going on) to see how more in-depth testing will benefit the code.
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Note You might well find that one software function covers a single algorithm; e.g., a controller called Sort Results would imply that some sorting code will need to be written (assuming there s no suitable sorting algorithm built in to the language or its collections API). So going sub-atomic in that case would involve diving inside a single controller and designing the internal logic in fine detail; i.e., you d draw one activity diagram for a single controller.
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9. Expand the Controllers into an Algorithm Design
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The Geocode location and related controllers can be expanded out into the following logic: geocode the address using the geocoding service if the geocoding service returns at least one candidate then if there is exactly one candidate or one of the candidates is a 100% match then set the AOI around that candidate else display the candidates in the candidate widget else (no candidates found) try the POI locator service if there is exactly one candidate or one of the candidates is a 100% match then set the AOI around that candidate else display the candidates in the candidate widget Figure 12 2 shows the same pseudocode transcribed into an activity diagram.
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Figure 12 2. Initial activity diagram for Geocode Address With a more complex algorithm you may also want to create additional diagrams, or use different diagram types, to describe the logic. The diagram doesn t necessarily need to be UML, as long as the format allows you to describe individual steps and state changes as discrete operations.
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8. Tie the Diagram Loosely to Your Domain Model
Using the ICONIX Process, you create a domain model, then use this during conceptual design identifying further domain classes in the process and then allocate behavior to each domain class during the detailed design. Normally you allocate behavior using sequence diagrams, which allow you to draw lines between objects to allocate operations/methods. But when designing algorithms, you re more likely to be using an activity or state chart diagram. You ll probably already have a pretty good idea which class or classes your algorithm will be implemented in. So at this stage, all that s needed is to drag the relevant domain classes onto the diagram, and place each one down the right-hand side, next to the relevant node see Figure 12 3. Think about not just the names mentioned in the activity, but what the output function is e.g., Geocode address using the geocoding service points to At least one candidate returned So from this it s fairly obvious that a collection of Candidates is returned so we ll add a CandidateCollection class to the model.
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