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API Car with FIPE integration (Hexagonal Architecture)\n\n![coverag](https://img.shields.io/badge/coverage-100%25-darkgreen)\n\nVersion DDD and Clean Architecture on [api-car-manager-with-fipe](https://github.com/skatesham/api-car-manager-with-fipe)\n\nAPI register vehicle indexed by brand and model with external client app price search.\n![alt text][8]\n\n---\n\n## 🧱 Hexagonal Architecture (Ports \u0026 Adapters)\n\n### 📘 Concept\n\nHexagonal (or **Ports and Adapters**) architecture isolates the **core business logic** from external systems.\nIt makes the application **independent of frameworks, databases, or delivery mechanisms**.\n\n---\n\n### 🧩 Diagram (ASCII in Markdown)\n\n```\n               +-----------------------------+\n               |        Incoming Adapters     |\n               |   (Controllers, CLI, APIs)   |\n               +-------------▲---------------+\n                             │\n                             │ Port (Input)\n                             │\n               +-------------┴---------------+\n               |        Application Core     |\n               |   (Use Cases / Domain Logic) |\n               +-------------▲---------------+\n                             │\n                             │ Port (Output)\n                             │\n               +-------------┴---------------+\n               |       Outgoing Adapters      |\n               | (DB, REST API, Message Bus)  |\n               +-----------------------------+\n```\n\n---\n\n### ⚙️ Layers Explained\n\n| Layer                         | Description                                                    | Examples                               |\n| ----------------------------- | -------------------------------------------------------------- | -------------------------------------- |\n| **Core (Domain + Use Cases)** | Contains pure business logic. No external dependencies.        | Domain models, services                |\n| **Incoming Adapter**          | Translates external input into commands for the core.          | REST controller, CLI, GraphQL          |\n| **Outgoing Adapter**          | Implements interfaces to external systems defined by the core. | Repository, HTTP client, Message queue |\n\n---\n\n### 🔁 Flow Example\n\n1. **Incoming adapter (API Controller)** receives a request.  \n2. It calls a **use case** defined in the **core** (via an input port).  \n3. The use case uses an **output port** (interface) to interact with a **repository adapter**.  \n4. The **repository adapter** talks to the database.  \n5. The **core** remains isolated — easily testable, replaceable, and reusable.  \n\n---\n\n### 🌟 Benefits\n\n✅ **Testability:** Core can be tested without DB or frameworks.  \n✅ **Replaceable Adapters:** Switch from REST → gRPC, or SQL → NoSQL easily.  \n✅ **Maintainability:** Business logic stays clean and stable.  \n✅ **Independence:** Frameworks and tools are secondary — not dictating your design.  \n\n---\n\n## Operation Functional Flow (part by part)\n\n1. Receive request for create Vehicle by POST Rest entrypoint  \n2. Validate database schema constraints, as: UK, Marca and Modelo  \n3. Produce Event for schedule creation  \n4. Consume Event and convert to Object  \n5. Request External Client [Demo FIPE][6] getting the vehicle FIPE price  \n6. When has External client Integration Error: send to DLQ\n7. Convert vehicle Price value to number\n8. Save vehicle on database\n\n## Stack\n\n__API__:\n\n- Java 11: Language Programming version 11\n- Spring Boot: Java Injection Framework\n- Spring Web: Embedded Web Server (Apache Tomcat)\n- Spring JPA: ORM Hibernate\n- OpenFeign: Web Client\n- RabbitMQ: Async Queue Messaging\n- Actuator: Health check\n- Flyway: Manage Database Migration Versioning\n- Netflix Ribbon: Client Side Load Balancer (Manage OpenFeign Client)\n- Jackson ObjectMapper: Library for mapper objects java.\n- PostgreSQL: Database SQL\n- PostgreSQL Driver: Configure connection with PostgreSQL Database\n- Lombok: Java Code Style Improvements\n\n__Tests__:\n\n- Wiremock: Mock Web client Server\n- H2: Light weight Embedded SQL Database\n- RestAssured: Testing BDD REST API\n- H2 Driver: Configure connection with H2 Database\n\n## Running App\n\n### Requirements\n\n- JDK Java 11\n- Docker / Docker Compose\n\n```shell\n./gradlew build --parallel --x test\ndocker build --tag=car-api:latest .\ndocker-compose up\n```\n\n### Open App\n\n- [Health Check][4]\n- [Swagger][1]\n- [Database Adminer][2]\n- [RabbitMQ Manager][3]\n\n__Example Vehicle Request__:  \nEndpoint: [POST /api/v1/veiculos][5]\n\nPayload:\n\n```json\n{\n  \"placa\": \"NEW-4321\",\n  \"marcaId\": 21,\n  \"modeloId\": 473,\n  \"precoAnuncio\": 1000000,\n  \"ano\": 2011\n}\n```\n\n__Database Credentials__:\n\n- [Database Adminer][2]\n\n```shell\nSystem: PosgreSQL\nServer: db\nUsername: 123456789\nPassword: 123456789\nDatabase: postgres\n```\n\n__RabbitMQ Credentials__:\n\n- [RabbitMQ Manager][3]\n\n```shell\nUsername: guest\nPassword: guest\n```\n\n## Schema\n\n![alt text][7]\n\n## Vehicle Creation Flow\n![alt text][9]\n\n## Credits:\n\nSham Vinicius Fiorin  \nBy Dryve\n\n[1]: http://localhost:8080/swagger-ui/index.html\n\n[2]: http://localhost:9000\n\n[3]: http://localhost:15672\n\n[4]: http://localhost:8080/actuator/health\n\n[5]: http://localhost:8080/swagger-ui/index.html#/Veiculo/createVeiculo\n\n[6]: https://github.com/giovanigenerali/fipe-json\n\n[7]: https://github.com/skatesham/api-car-manager-with-fipe/blob/main/imgs/schema.png?raw=true\n\n[8]: https://github.com/skatesham/api-car-manager-with-fipe/blob/main/imgs/openapi.png?raw=true\n\n[9]: https://github.com/skatesham/api-car-manager-with-fipe/blob/main/imgs/flow-diagram.drawio.png?raw=true\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fskatesham%2Fhexagonal-api-car-spring-rabbitmq-template","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fskatesham%2Fhexagonal-api-car-spring-rabbitmq-template","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fskatesham%2Fhexagonal-api-car-spring-rabbitmq-template/lists"}