Demonstration Project

Builds

Greetings UI

Greetings Service

Stat Service

Architecture overview

graph TD
%% Define nodes
    greetings_ui["greetings-ui: Greetings User Interface"]
    greetings["greetings-service: Create Greetings Messages"]
    greetings_db["Greetings DB: PostgreSQL"]
    stats["greetings-stats-service: Records Statistics"]
    stats_db["Statistics DB: PostgreSQL"]
    kafka["Kafka: greeting_topic"]
%% Relationships
    greetings_ui -->|" GET/POST/PUT "| greetings
    greetings_ui -->|" GET /stats "| stats
    greetings -->|" Reads/Writes "| greetings_db
    stats -->|" Reads/Writes "| stats_db
    greetings -->|" Produces Events "| kafka
    stats -->|" Consumes Events "| kafka
    stats -->|" GET /greetings/{id} "| greetings

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List of patterns / concepts /technics demonstrated

• Hexagonal Architecture
• Multimodules Spring Boot Project
• REST API with Spring MVC (greeting service) and Spring Web Reactive (stat service)
• Kafka Consumer (stat service) / producer (greeting service)
• Reactive implementation (stat service)
• Test : Unit tests with Mockito and AssertJ
• Test : Integration tests with Spring Slice Tests Annotations
• Test : Integration tests with @EmbeddedKafka
• Test : Integration tests with Wiremock and Spring Cloud Contract Stub Runner
• Test : CDC tests with Pact
• Test : BDD tests with Cucumber and JUnit 5

TODOs

• Implement Error Handling in API to customize responses
• Implement Outbox pattern for greeting-producer
• Create a UI to interact with APIs
  • Create an SSE endpoint to send events to UI