Connie's Convenience Store - About Peter Coad

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88 Connie’s Convenience Store Working Out Data-Management Dynamics with Scenarios #80. “Establish Data Management establishing responsibilities / Object Connections” Strategy who I know (model components) • For a data management object, include an object connection (expressed as an attribute) to the problem-domain objects (all of the objects in some problem-domain class) that it is responsible for. Each DM object does the DM basics: search, save, and load. #100. “Establish Data Management establishing responsibilities / Services” Strategy what I do (model component) • For data management objects, include these services: search, save, load. Add DM objects and responsibilities to your model (Figure 1–61): DataManagement CashDrawerDM CashierDM ItemDM PaymentDM PersonDM PriceDM RegisterDM SaleDM SaleLineItemDM SessionDM StoreDM TaxCategoryDM UPCDM CashierDM cashiers SessionDM sessions StoreDM stores PriceDM prices ItemDM PaymentDM payments Figure 1–61: Data management objects and responsibilities. For details on using the DM architecture with a wide variety of data-management systems (spanning files, relational databases, object databases, and SOM/DSOM), see the Data Management Appendix. WORKING OUT DATA-MANAGEMENT DYNAMICS WITH SCENARIOS Here’s how. To work out dynamics with DM objects: Begin with a service in an HI component (for “save” and “load”), or sales items SaleDM SaleLineItemDM saleLineItems upcs UPCDM CashDrawerDM cashDrawers RegisterDM registers TaxCategoryDM taxCategories PersonDM persons
Working Out Data-Management Dynamics with Scenarios Connie’s Convenience Store 89 Begin with a search need from the PD component. Here, consider a search need from a PD object: store.getCashierForID store.getItemForUPC. Work out the dynamics for interacting with DM objects. Scenario: get cashier for number Here you go again. For this scenario, you need a “cashier DM” object. That object knows how to use the local file system to efficiently find the cashier object for the number. Here is the scenario view (Figure 1–62): Store Figure 1–62: The “get cashier for number” scenario view. Note that the basic search service, one that all DM objects provide, is made specific in the scenario view, using “search on .” Scenario: get item for UPC This time, you’ll need an “item DM” object. The item DM knows how to use the local file system to efficiently find the item object for the UPC. Here is the scenario view (Figure 1–63): Store CashierDM getCashierForNumber searchOnNumber getCashierForNumber store.getCashierForNumber (number ; cashier) searchOnNumber ItemDM getItemForUPC searchOnUPC Scenario: get item for UPC. Scenario constraint: 0.1 seconds, 9 out of 10 times, 0.5 seconds max. getItemForUPC store.getItemForUPC (upc ; item) searchOnUPC Scenario: get cashier for number. Scenario constraint: 0.1 seconds, 9 out of 10 times, 0.5 seconds max. cashierDM.searchOnNumber (number ; cashier) itemDM.searchOnUPC (upc ; item) Figure 1–63: The “get cashier for id” scenario view.
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GETTING STARTED 1 Connie’s Conven
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Identifying System Purpose and Feat
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Selecting Objects Connie’s Conven
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Selecting Problem-Domain Objects Co
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Establishing Responsibilities for P
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