Object Persistence: Beyond Object Oriented Databases by Roger Sessions

By Roger Sessions

For object-oriented programmers, software builders enforcing chronic items, and datastore services desirous to plug into this provider. This publication describes the thing administration teams normal for the endurance item carrier (POS), and the buyer programming version, exhibiting precisely how customer code could be written to shop and restoration gadgets. the following iteration of item endurance items should be in accordance with this crucial specification.

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93. Do Not Name Associations That Have Association Classes The name of the association class should adequately describe it. Therefore, as you can see in Figure 19, the association does not need an additional adornment indicating its name. 94. Center the Dashed Line of an Association Class The dashed line connecting the class to the association path should be clearly connected to the path and not to either class or to any adornments of the association, so that your U M L C L A S S D I AG R A M S 5 1 meaning is clear.

4. UML Use-Case Diagrams A UML use-case diagram shows the relationships among actors and use cases within a system. They are often used to ■ ■ ■ provide an overview of all or part of the usage requirements for a system or organization in the form of an essential model (Constantine and Lockwood 1999, Ambler 2004) or a business model (Rational Corporation 2002); communicate the scope of a development project; model the analysis of usage requirements in the form of a system use-case model (Cockburn 2001).

Place Your Primary Actor(s) in the Top Left Corner of the Diagram In Western cultures, we start reading in the top left corner. All things being equal, this is the best location for your primary actors, who are often directly involved with your primary/critical use cases. For example, you can see in Figure 15 that Customer is placed near the top left corner of the diagram, as opposed to the Customer Support actor, which is placed on the right-hand side. Also notice how the two most critical use cases, the ones supporting the sale of items on the Web site, are also placed at the top left, and the guideline Imply Timing Considerations by Stacking Use Cases has also been applied to order Search for Items and Place Order.

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