Model Mitosis by Julien Topçu & Josian Chevalier

Discover how to tame complexity in your models by refactoring with a shared kernel, anti-corruption layer, and microservices architecture, illustrated with a real-world example of booking and search domains.

Key takeaways

Model tension is a source of complexity and coupling between domains.
A shared kernel helps to reduce model tension by sharing common concepts and behavior between domains.
A transitional shared kernel can be used to refactor code and reduce coupling between domains.
Code duplication is not always a bad thing if it helps to decouple domains and reduce complexity.
The anti-corruption layer is used to protect the bounded context of the booking domain from changes in the search domain.
The booking and search domains have different business logic and invariants, and need to be separated to avoid complexity and coupling.
A microservices architecture can be used to further decouple the domains and improve scalability and maintainability.
The shared kernel can be used to implement common interfaces and behavior between domains.
The fare belongs to the shared kernel.
The tax rate comes from the booking domain.
The schedule is used to compute the duration and arrival time of the space train.
The search and booking domains have different views of the space train, and the shared kernel is used to reconcile these differences.

Model Mitosis by Julien Topçu & Josian Chevalier

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