eventmodeling-designing-event-models

Design event-sourced models by mapping business processes to immutable events and establishing clear stream boundaries. This approach enforces minimal, command-driven state isolation, preventing the DDD aggregate anti-pattern while keeping validation logic pure and performant.

A minimal state projection is a command-specific read model used to validate business rules before generating immutable events. It ensures validation logic remains strictly separated from UI query models and performs efficiently by isolating only the necessary state for each command.

You need to define stream boundaries during the architectural phase of event streaming systems when mapping business processes. Establishing clear identity strategies at this stage prevents state coupling and avoids the DDD aggregate anti-pattern in your event-sourced domain models.

Initiate the event modeling process by describing your primary entity and its triggering commands. This maps business processes into immutable events while maintaining a strict architectural separation between command validation state and UI query models.

Yes, event modeling explicitly guides the creation of command-specific read models to ensure validation logic remains pure. It maintains strict separation between command validation state and UI query models in event-driven services.

Using DDD aggregate patterns in event-sourced systems causes state coupling and boundary violations. Event modeling resolves this architectural struggle by enforcing minimal, command-driven state isolation and establishing clear stream identity strategies to prevent aggregate anti-patterns.