Connie's Convenience Store - About Peter Coad

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58 Connie’s Convenience Store Applying Patterns: Establish Problem-Domain Responsibilities Item–line item Okay. What’s next? How about this: #9. “Item–Line Item” Pattern transaction patterns • Typical object interactions howMany —> getQuantity calcOverLineItems —> calcForMe rankLineItems —> rateMe • Examples (with transaction line items) item–order line item; item–payment line item; item–rental line item; item–sale line item; item–shipment line item (with container line items) item–bin line item; item–warehouse line item. • Combinations transaction–transaction line item; subsequent transaction–subsequent transaction line item; transaction line item–subsequent transaction line item; container–container line item. For item–sale line item: – item (collection … of its sale line items) how much over interval – sale line item (worker) how much over interval. Add services to item and sale line item, and by analogy to cashier, session, and sale (Figure 1–37): Cashier howManyOverInterval howMuchOverInterval n 1 Item name number description price aboutMe howMany rankLineItems calcOverLineItems calcForMe Session howManyOverInterval howMuchOverInterval n 1 n Sale howManyOverInterval howMuchOverInterval calcSubTotal n-1 SaleLineItem howManyOverInterval calcSubTotal Figure 1–37: Some pattern instances. 1 quantity status aboutMe LineItem calcForMe rateMe 1 1 n Item howManyOverInterval
Applying Patterns: Establish Problem-Domain Responsibilities Connie’s Convenience Store 59 Progress at this point You’ve now selected objects and established responsibilities for the problem domain objects. Here’s your progress at this point (Figure 1–38): ProblemDomain Person AuthorizedPayment Cash CashDrawer Cashier Charge Check Item Payment Person PromoPrice Register ReturnLineItem Sale SaleLineItem Session Store TaxCategory Cash cashTendered Payment amount Session startDate startTime endDate endTime Check bankRoutingNumber accountNumber amtTendered 1 1 n name address phone Cashier number password authorizationLevel currentSession isAuthorized assessPerfOverInterval howManyOverInterval howMuchOverInterval 1 1 1 n 1 n number name n 1 1 AuthorizedPayment authorizationCode authorize Charge cardNumber cardType expirationDate Figure 1–38: Progress at this point. n Sale date time calcSubTotal calcDiscount calcTax calcTotal commit howManyOverInterval howMuchOverInterval 1-n 1 1 SaleLineItem quantity taxStatus calcSubTotal howManyOverInterval 1 ReturnLineItem salePrice returnPrice reasonCode saleDate n Store getItemForUPC getCashierForNumber n n Register howManyOverInterval howMuchOverInterval number description n n 1 1 Item getPriceForDate howManyOverInterval howMuchForQty 1 n 1 Price price effectiveDate PromoPrice expirationDate n n n n 1 CashDrawer operationalState position balance open TaxCategory category rate effectiveDate upc UPC
Page 1 and 2:
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 55 and 56: Applying Patterns: Establish Proble
Page 57: 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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