Connie's Convenience Store - About Peter Coad

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70 Connie’s Convenience Store Establishing Human Interaction Responsiblities Logon window Establish responsibilities: “what I know.” #57. “Establish Window establishing responsibilities / or Report Attributes” Strategy what I know (model components) • For windows or reports, include: search fields, data entry fields, or both. For the logon window, you need these fields: – cashier number – cashier password – register number. Establish responsibilities: “who I know.” #79. “Establish Window or Report establishing responsibilities / Object Connections” Strategy who I know (model components) • For a window or report, include an object connection (expressed as an attribute) to: the contents of the window, the objects it knows directly, to get the content it needs to do its job (note that a window can use those objects to get to other objects, indirectly). Here the objects a logon window needs to know include: – store (a collection of cashiers, with the ability to search for a cashier, given a cashier number) – cashier. One could model this “who I know” aspect with object connections. Yet object connections that span across object-model components are usually shown textually (so that they are easier to read and understand). Establish responsibilities: “what I do.” Here’s how. For a window, the “what I do” are those the window-specific menu actions for that window. In addition, every window object knows how to display itself. And every window class knows how to create (and initialize) a new object in that class. Here, all you need to add is: – logon. Add the logon window and its responsibilities to the object model (Figure 1–45):
Establishing Human Interaction Responsiblities Connie’s Convenience Store 71 LogonWindow cashierNumber cashierPassword cashier store registerNumber logon Figure 1– 45: Logon window: “what I know; who I know; what I do.” Sale window Establish responsibilities: “what I know.” Consider a sale window. What does it know? It knows values, ones that it eventually sends as message arguments: – upc – session. Establish responsibilities: “who I know.” Who does a sale window know? Here’s the scoop: objects, ones that it eventually sends messages to. A sale window needs to send messages to: – sale – sale line item – item – payments. Establish responsibilities: “what I do.” What does a sale window do? Here are the services: – commit – cancel. Add sale window responsibilities to the model (Figure 1–46): SaleWindow upc session sale saleLineItem item payments commit cancel Figure 1–46: Sale window: “what I know; who I know; what I do.” For additional windows, follow the same basic strategies, again and again.
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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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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 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: 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
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Page 95: Wrap Up Connie’s Convenience Stor
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Connie's Convenience Store - About Peter Coad

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