spring-architecture-split-1.../docs/architecture/adr-payment-boundary.md

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Architectural Decision Record for Payment Boundary

Context

In order to ensure the integrity and separation of concerns within the payment processing system, we need to define firm boundaries between various components: Controller, Service, Repository, Domain, and Integration. This helps in minimizing unintended dependencies that may arise during development.

Decision

The payment boundary will be strictly defined such that:

  • Controllers interact only with Services.
  • Services interact only with Repositories and Domains (no direct interaction between Services and Controllers).
  • Repositories handle data access and business logic is encapsulated within Services.
  • Integration with external systems is managed separately and will not cross into the Service layer.

Alternatives

  1. Allow Services to directly interact with Repositories for data retrieval.
    Consequences: Increases coupling and can lead to issues with data integrity and business logic being bypassed.
  2. Utilize an Event-Driven Architecture for communications between Services and Integrations.
    Consequences: Increased complexity and potential performance hits.

Consequences

By setting these boundaries, we are ensuring that changes in one component do not inadvertently affect others, thus maintaining a clean architecture that adheres to SOLID principles. Scalability and maintainability of the system are expected to improve as team members can work more independently without overlapping concerns.