April 2009
DDD-es Group Announced
DDD-es is a recently announced Google Group formed by José Manuel Beas with the goal of discussing and learning about Domain-Driven Design in Spanish.
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TimeAndMoney
This is a project to develop code for manipulating basic concepts in recurring domains such as time and money. The design principles followed here are explained in Part III of the book Domain-Driven Design.
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FAQ
Questions frequently asked on the DDD Yahoo! Group.
You are welcome to contribute: if you follow the DDD Yahoo! Groups discussion and find a thread particularly interesting, this is the place to share it.
Since discussion threads can be long, we recommend that you don't put it here in its entirety but distill its first - this will make it so much more valuable.
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Glossary of Domain-Driven Design Terms
Excerpted from Domain-Driven Design Book
Aggregate A cluster of associated objects that are treated as a unit for the purpose of data changes. External references are restricted to one member of the AGGREGATE, designated as the root. A set of consistency rules applies within the AGGREGATE'S boundaries.
Analysis Pattern A group of concepts that represents a common construction in business modeling. It may be relevant to only one domain or may span many domains (Fowler 1997, p. 8).
Aggregate A cluster of associated objects that are treated as a unit for the purpose of data changes. External references are restricted to one member of the AGGREGATE, designated as the root. A set of consistency rules applies within the AGGREGATE'S boundaries.
Analysis Pattern A group of concepts that represents a common construction in business modeling. It may be relevant to only one domain or may span many domains (Fowler 1997, p. 8).
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Value Object
Excerpted from Domain-Driven Design Book
Definition: A Value Object is an object that describes some characteristic or attribute but carries no concept of identity.
Problem:
Tracking the identity of Entities is essential, but attaching identity to other objects can hurt system performance, add analytical work, and muddle the model by making all objects look the same.
Definition: A Value Object is an object that describes some characteristic or attribute but carries no concept of identity.
Problem:
Tracking the identity of Entities is essential, but attaching identity to other objects can hurt system performance, add analytical work, and muddle the model by making all objects look the same.
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Test-Driven Development
Test-Driven Development
TDD is a lightweight programming methodology that emphasizes fast, incremental development and especially writing tests before writing code. Ideally these follow one another in cycles measured in minutes.
TDD is a lightweight programming methodology that emphasizes fast, incremental development and especially writing tests before writing code. Ideally these follow one another in cycles measured in minutes.
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Unification
The internal consistency of a model such that each term is unambiguous and no rules contradict.
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Ubiquitous Language
Excerpted from Domain-Driven Design Book
Definition: A language structured around the domain model and used by all team members to connect all the activities of the team with the software.
Problem:
A project faces serious problems when its language is fractured. Domain experts use their jargon while technical team members have their own language tuned for discussing the domain in terms of design.
Definition: A language structured around the domain model and used by all team members to connect all the activities of the team with the software.
Problem:
A project faces serious problems when its language is fractured. Domain experts use their jargon while technical team members have their own language tuned for discussing the domain in terms of design.
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