ddd-context-mapping

To define context mapping patterns, identify upstream and downstream context pairs and apply relationships like Anti-Corruption Layer or Open Host Service. This establishes clear ownership boundaries and integration contracts to prevent domain leakage.

You need an Anti-Corruption Layer when migrating from monoliths to microservices to isolate downstream contexts. It prevents domain leakage by translating terms and enforcing ownership boundaries between paired contexts like Billing and Checkout.

The best way to document integration contracts is to map all context pairs, assign a relationship pattern, and capture translation rules. This creates a clear ownership matrix that defines data translations and versioning policies across boundaries.

Apply DDD context mapping by identifying relationship directions between context pairs and choosing patterns like Conformist or Customer-Supplier. This documents ownership boundaries while capturing failure modes and versioning policies for risk mitigation.

Yes, using an Open Host Service with a Published Language defines integration contracts for upstream contexts. This mapping pattern establishes a standardized communication protocol and clear ownership matrix for downstream consumers.