Implementing Domain-Driven Design

Event-Driven Architecture

Event-driven architecture (EDA) is a software architecture promoting the production, detection, consumption of, and reaction to events. [Wikipedia, EDA]

The Hexagonal Architecture shown in Figure 4.4 can represent the notion of one system participating in an EDA by means of incoming and outgoing messages. An EDA doesn’t have to use Hexagonal, but it’s a decent way to present the concepts here. On a greenfield project it would be well worth it to consider using Hexagonal as the overarching style.

Examining Figure 4.4, say that the triangular client and the corresponding triangular output mechanism represent the messaging mechanism used by the Bounded Context. Input events enter on a Port separate from the one used by ...