Connie's Convenience Store - About Peter Coad

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78 Connie’s <strong>Convenience</strong> <strong>Store</strong> Working Out Human-Interaction Dynamics with Scenarios “Total the sale” scenario Here is the scenario view (1–53): SaleWindow total display total saleWindow.total display Receipt Sale addTotalLines addSubTotalLine addTaxLine addTotalLine addTotalLines addSubTotalLine [addTotalLines] addTaxLine [addTotalLines] addTotalLine calcSubtotal calcTax calcTotal calcSubtotal calcTax calcTotal Figure 1–53: The “total the sale” scenario view. Scenario: actual cashier totals a sale. Scenario constraint: 0.1 seconds, 9 out of 10 times, 1 second max. receipt.addTotalLines receipt.addSubTotalLine sale.calcSubTotal ( ; subtotal) receipt.addTaxLine sale.calcTax ( ; tax) receipt.addTotalLine sale.calcTotal ( ; total) saleWindow.display “Get payment by check” scenario It’s just about time for another scenario view. But first, note that you need to get the authorization done. Add an authorization system object to take care of it (more on this in the pages ahead). Meanwhile, here is the scenario view (Figure 1–54):
Scenario: get payment by check Receipt Sale AuthorizationSystem Check SaleWindow Scenario constraint: 0.1 seconds, 9 out of 10 times, 0.5 seconds max. addPaymentLines addPayment getAuthorization create authorize payByCheck display saleWindow.payByCheck Check.create(number,bankRoutingNumber,amt; checkPayment) check,authorize (; result) authorizationSys.authorizeCheck(check ; result) payByCheck create authorize getAuthorization // got authorization sale.addPayment (check ; ) saleWindow.display receipt.addPaymentLines (check ; ) IF addPayment display addPaymentLines ENDIF Figure 1–54: The “get payment by check” scenario view. 79
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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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Applying Patterns: Select and Organ
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Page 27 and 28: Applying Patterns: Select and Organ
Page 29 and 30: Establishing Responsibilities for P
Page 55 and 56: Applying Patterns: Establish Proble
Page 61 and 62: Working Out Problem-Domain Dynamics
Page 63 and 64: Working Out Problem-Domain Dynamics
Page 65 and 66: Scenario: sale calculates its total
Page 67 and 68: Selecting Human-Interaction objects
Page 69 and 70: Establishing Human Interaction Resp
Page 71 and 72: Establishing Human Interaction Resp
Page 73 and 74: Working Out Human-Interaction Dynam
Page 75 and 76: Scenario: actual cashier logs on. S
Page 77: Scenario: sell item. Receipt SaleLi
Page 81 and 82: Selecting System-Interaction Object
Page 83 and 84: Establishing System-Interaction Res
Page 85 and 86: Working Out System-Interaction Dyna
Page 87 and 88: Selecting Data-Management Objects a
Page 89 and 90: Working Out Data-Management Dynamic
Page 91 and 92: Progress at This Point Connie’s C
Page 93 and 94: Progress at This Point Connie’s C
Page 95: Wrap Up Connie’s Convenience Stor
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Connie's Convenience Store - About Peter Coad

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