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10. Create an Architecture
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The architecture represents a high-level overview of the system you re about to analyze and design. Architectural diagrams are usually topological i.e., they show server nodes with their conceptual locations (whether local or remote, or the name of a particular site if known), and the proposed comms protocols to link the server nodes together. For example, Figure 4 1 shows a high-level architecture diagram for the VResorts Mapplet. Sometimes the protocols may be a foregone conclusion (as in the case of the Mapplet, which was partly intended to showcase the ESRI technology, and had some decisions made up-front based on its predecessor, the Mapplet 1.0). One such decision was that the new Mapplet would use a Flex-based client UI to create a rich client user experience; this, in turn, suggested that Adobe s BlazeDS would be used for client<-->server communication. These sorts of decisions are never completely set in stone, but they tend to end up on architecture diagrams as a sort of hint to the designers. Another way to look at this is that the requirements drive the architecture (as you d expect); but occasionally, as we intimated earlier in this chapter, the architecture can also drive the requirements. For example, with the Mapplet, a big prerequisite was that the XML Service (an external hotel search system) would be used, as VResorts wanted the ability to check pricing and availability in real-time. It was also known that ESRI would be providing the development team, who, in turn, would be targeting ArcGIS Server for the hotel mapping functions. While there was a lot of input from VResorts into the requirements and the UI, many of the requirements were driven by the capabilities known to be available in ArcGIS Server.
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CHAPTER 4 INTRODUCING THE MAPPLET PROJECT
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Figure 4 1. Mapplet architecture In Figure 4 1, the idea is that the user wants to search for hotels in the vicinity of a particular address or point of interest. So he or she browses a map (served up by ArcGIS Server), which is combined with a list of matching hotels from the XML Service. The Java-based Hotel Search Service returns these details to the Flex client. The XML search is for live hotel data access, whereas the ArcGIS Server search is against a static copy of the hotel data that has been imported into its geodatabase. The geodatabase also contains landmark or Point of Interest (POI) data.
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9. Agree on Requirements, and Test Against Them
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Next, you should agree on business requirements, and then write tests in support of those requirements. As you ll see in the next section, the business requirements are sometimes driven (to an extent) by the already-known architectural constraints. However, for the most part, requirements tend to start out as an unstructured stream-of-consciousness from the customer: a long list of what I want is statements. It s the job of a business analyst to push back on these requirements and extract the real reason for them from the customer: to establish why as well as what (which customers tend to start off with). Often this pushing-back process can result in a different set of requirements, or a brand-new set being discovered. The business analyst then structures these business requirements into logically grouped areas, though they tend to remain throughout the project as a long list of wants. As you ll see later in this chapter, it s worth doing further modeling on the business requirements to create behavioral requirements (i.e., use cases).
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CHAPTER 4 INTRODUCING THE MAPPLET PROJECT
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We cover requirements modeling and testing in 8; but, for now, here s a brief overview of the Mapplet requirements. The requirements were entered into Enterprise Architect (EA) and grouped into the following areas, or packages: Functional Requirements |__ User Interface |__ Hotel Filter |__ Map Figure 4 2 shows the Hotel Filter requirements, which led to the Advanced Search use case. The idea behind hotel filtering is to be able to declutter a map that shows a large number of hotels, in order to quickly and easily zero-in on a specific set of filter criteria. Mapplet 1.0 supported filtering against a set of amenities (pool, room service, etc.) and a few other categories. Mapplet 2.0 s use of a live XML data feed allows us to include availability during a given time period, and filtering by price (which is not a static property of a hotel, but varies by date and availability and is continuously updated in something called the Global Distribution System).
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