July 2017
Beginner to intermediate
358 pages
10h 54m
English
Content preview from Building Microservices with Go
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Tactical design
From the base of strategic design comes tactical design, to quote Vaughn Vernon again:
"Tactical design is like using a thin brush to paint the finer details of your domain model."
– Vaughn Vernon
At this stage in the design, we need to start thinking about aggregates and domain events. An aggregate is composed of entities and value objects. A value object models an immutable whole; it does not have a unique identity, and equivalence is determined by comparing the attributes encapsulated by the value types. Domain events are published by an aggregate and subscribed to by interested parties. This subscription could be from the same Bounded Contexts, or it may come from a different source.
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