July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
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27.3. Time Intervals and Product Prices—Fixing an Iteration 1 “Error”
In the first iteration, SalesLineItems were associated with ProductSpecifications, that recorded the price of an item. This was a reasonable simplification for early iterations, but needs to be amended. It raises the interesting—and widely applicable—issue of time intervals associated with information, contracts, and the like.
If a SalesLineItem always retrieved the current price recorded in a ProductSpecification, then when the price was changed in the object, old sales would refer to new prices, which is incorrect. What is needed is a distinction between the historical price when the sale was made, and the current price.
Depending on the information requirements, there are ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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