AWG Blogs

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    4 months ago
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    4 months ago
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    5 months ago
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    9 months ago
  • Algorithms and OOP - In addition to DCI, "generic programming" as well as the move to functional programming appears to add nuance to the OOP notion of joining behavior with da...
    11 months ago
  • Flyweight vs Singleton - Implementations seems to be virtually identical, differing only in style, where the flyweight object is created and held by associated objects (containers:...
    1 year ago
  • init-param vs context-param - see http://javahash.com/difference-between-servlet-init-and-context-parameter/ for background. Gist: context-param variables are global and accessible thro...
    1 year ago
  • rbenv vs RVM - RVM is responsible not only for changing Ruby versions, but for installing rubies and managing gemsets, as well. ...Along with rbenv [to manage ruby versi...
    1 year ago

Sunday, April 15, 2012

UML Aggregation Vs DDD Aggregate

The same root term "Aggregate" in DDD does not correspond to the UML "Aggregation" notation (filled diamond).

DDD use of root term "Aggregate":
OrderLines have no reason to exist without their parent Order, nor can they belong to any otherOrder. In this case, Order and OrderLines would probably be an Aggregate, and the Order would be the Aggregate Root