Connie's Convenience Store - About Peter Coad

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76 Connie’s Convenience Store Working Out Human-Interaction Dynamics with Scenarios Scenario: make a sale This scenario consists of a number of shorter scenarios: – start sale – sell item – total the sale – gets payment by check – complete the sale. “Start sale” scenario Here is the scenario view (Figure 1–51): SaleWindow startSale display startSale saleWindow.startSale display create create Figure 1– 51: The “start sale” scenario view. Note that a sale window knows its corresponding receipt. That’s something new, something you need to add to the object model. Note also that basic services (for an object: get, set, add a connection, remove a connection; for a class: create) appear in scenarios as needed. That’s just fine. “Sell item” scenario Here is the scenario view (Figure 1–52): Sale Receipt create addHeadingLine create addHeadingLine Scenario: start sale. Scenario constraint: 0.1 seconds, 9 out of 10 times, 0.5 seconds max. Sale.create (session, store; sale) Receipt.create (sale ; receipt) receipt.addHeadingLine saleWindow.display
Scenario: sell item. Receipt SaleLineItem Sale Store SaleWindow Scenario constraint: 0.1 seconds, 9 out of 10 times, 0.5 seconds max. addLineItemLine create addSaleLineItem getItemForUPC sellItem, display sellitem saleWindow.sellItem getitemForUPC store.getitemForUpc (upc ; item) addSaleLineItem sale.addSaleLineItem (item, qty ; saleLineItem) SaleLineItem.create ( item, qty ; saleLineItem) create saleWindow.display addLineItemLine receipt.addLineItemLines (saleLineItem ; ) display saleWindow.display Figure 1–52: The “sell item” scenario view. 77
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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 25 and 26: Applying Patterns: Select and Organ
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: Scenario: actual cashier logs on. S
Page 79 and 80: Scenario: get payment by check Rece
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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