adapter:outbound:persistence-mongo — module rules

Registered identity

Module ID: adapter-outbound-persistence-mongo
Gradle path: :adapter:outbound:persistence-mongo
Focused test (derived from Gradle path): ./gradlew :adapter:outbound:persistence-mongo:test --console=plain
Runtime baseline: Java 21; repository framework baseline: Spring Boot 4.0.0.
Registry SSOT: src/config/architecture/modules.json.

Package root: dev.caskeleton.adapter.outbound.mongo. Driven (outbound) adapter — opt-in Spring Data MongoDB infrastructure. Design rationale lives in README.md.

Responsibility

Provide opt-in Mongo client and template infrastructure without shipping a fake business domain.
Real forks add their own document, repository, mapper, and application/domain port implementation.
It does not reimplement idempotency / outbox / lock on Mongo (those stay JPA-only).
Opt-in: MongoPersistenceConfig re-imports the Mongo auto-configuration (@ImportAutoConfiguration) only when ca-skeleton.persistence-mongo.enabled=true (default off). The connection URI and database come from Spring's standard spring.data.mongodb.* settings.
MongoOptInAutoConfigurationImportFilter, registered through META-INF/spring.factories, blocks Boot 4's classpath-driven sync/reactive/data/repository/health/metrics Mongo auto-configuration when the module enable flag is absent or false.

Allowed

No project dependency is required by the generic infrastructure. The allowed-edge SSOT remains the adapter-outbound-persistence-mongo entry in src/config/architecture/modules.json.
External: org.springframework.boot:spring-boot-starter-data-mongodb (version via the shared Spring Boot BOM), spring-boot-configuration-processor (annotation processor).

Forbidden

Inbound adapters, sibling outbound adapters, app-bootstrap, sample-portfolio (ArchUnit OUTBOUND_ADAPTERS_* family rules).
Shipping placeholder Example* document, repository, record, or adapter types in production.
Adding idempotency/outbox/lock on Mongo without a separately approved contract.
Fully-qualified inline type references; more than one public top-level type per file.

Tests

MongoPersistenceConfigTest proves default/false behavior through an actual @EnableAutoConfiguration context, typed enablement binding, and enabled infrastructure with a mock MongoClient plus a real MongoTemplate without a network connection.

cd src
./gradlew :adapter:outbound:persistence-mongo:check

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