In several software applications, a single data item triggers one or more information flows that affect function played by the triggering data item. The data item, call transaction.
Transaction mapping Vin the Illustrator by considering the user interaction subsystem of the safe home software. A single data item, command type, causes the data flow to fan outward from a hub. Therefore, the overall data flow characteristic is transaction-oriented. It should be remarked that information flow along two of the three action paths provides additional incoming flow. Each action, path flows into a single transform, display messages, and status.
The design steps for transaction mapping are related and in some cases same as steps for transform mapping. An important difference lies in the mapping of DFD to software structure.
Step 1: review the fundamental system model.
Step 2: Review refines data now diagrams for the software.
Step 3: Determine whether the DFD has transform or transaction flow characteristics.
Step 4: distinguish the transaction center and the flow characteristics with each of the action paths.
The place of the transaction center can be directly discerned from the DFD. The transaction center lies at the source of several action paths that flow entirely from it. The invoke command processing bubble is the transaction center. The incoming path and all action paths must also be separated. Each action path must be assessed, for its flow characteristics.
Step 5: Plan the DFD in a program structure manageable to translation processing.
Transaction flow is mapped into a structure that includes an incoming branch and a dispatch branch. The structure of the incoming branch is designed in much the identical way as to transform mapping.
Beginning at the transaction center, bubbles along the incoming path are mapped into modules. The structure of the dispatch branch includes a dispatcher module and controls all subordinate action modules. Each action flow path of the DFD is mapped to a structure the corresponds to its particular flow characteristics.
Step 6: Factor and improve the transaction structure and the structure of each working path.
All action path of the data flow diagram has its data flow characteristics. The action path correlated to the substructure is generated using the design steps. The flow shows classic - transform characteristics. A key is input and transmitted to a transform center where it is compared against stored passwords. An alarm and warning message at producer if a match is not reached.
Step 7: In the first iteration architecture using design heuristics for improved software quality.
A first iteration architecture always is defined by applying concepts of module independence. Modules are exploded or imploded to create sensible factoring, good cohesion, minimal coupling, and most importantly, a structure that can be executed without difficulty, tested with confusion, and persevered without pain.
There are times, for example, when some input processing is needed in your module that is subordinate to the transforming controller when coupling due to global data cannot be withdrawn, or when optimal structural characteristics cannot be done. Many modifications can be made to the first iteration architecture developed for the safe home monitor sensor subsystem.
Among many possibilities
The purpose of the preceding seven steps is to develop an architectural display of the software. That is, one structure is defined to evaluate and refine software architecture by viewing it as a whole. Modifications made at this time will require little additional work, yet can have a profound, importance on software quality.
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