Connie's Convenience Store - About Peter Coad

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54 Connie’s Convenience Store Establishing Responsibilities for Problem-Domain Objects Establish responsibilities: “what I do.” What’s the same? Just the basic services. What’s different? At some point, an authorized payment needs to be authorized. So you can think of an authorized payment object as one that can authorize itself. Add a service called: – authorize. Add payment (and kinds of payment) responsibilities to the object model. Be sure to include authorized payment, too (Figure 1–35): Cash cashTendered Payment amount Check Figure 1–35: Payments and kinds of payments: “what I know; who I know; what I do.” Session After all of that, a session will seem like a cakewalk. It is. Establish responsibilities: “what I know.” What does a session object know? The attributes are: – start date – start time – end date – end time. 1 bankRoutingNumber accountNumber amtTendered n AuthorizedPayment authorizationCode authorize Sale calcDiscount Charge cardNumber cardType expirationDate
Applying Patterns: Establish Problem-Domain Responsibilities Connie’s Convenience Store 55 Establish responsibilities: “who I know.” Who does a session know? A session knows its: – register – cashier. (And yes, each register and cashier knows about its sessions.) Establish responsibilities: “what I do.” What does a session do? A session is a collection of its sales (the sales made during the session). So it can provide these services: – how much (money collected) over interval – how many (sales) over interval. Add session responsibilities to your object model (Figure 1–36): startDate startTime endDate endTime Session howManyOverInterval howMuchOverInterval 1 n 1 n Register Cashier Figure 1–36: Session: “what I know; who I know; what I do.” APPLYING PATTERNS: ESTABLISH PROBLEM-DOMAIN RESPONSIBILITIES At this point, you’ve established a number of responsibilities for each PD object, spanning “what I know, who I know, and what I do.” Now consider patterns. A pattern includes stereotypical responsibilities for each object in the pattern. Check it out, with collection-worker.
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GETTING STARTED 1 Connie’s Conven
Page 3 and 4: Identifying System Purpose and Feat
Page 5 and 6: Selecting Objects Connie’s Conven
Page 7 and 8: Selecting Problem-Domain Objects Co
Page 19 and 20: Applying Patterns: Select and Organ
Page 29 and 30: Establishing Responsibilities for P
Page 53: Establishing Responsibilities for P
Page 57 and 58: Applying Patterns: Establish Proble
Page 59 and 60: 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 and 78: Scenario: sell item. Receipt SaleLi
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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