Spring Microservices Tutorial

Monolithic Repository (Monorepo)

Modules

• Eureka server - Discovery
• User service - Simple Eureka client
• Config server - Configuration
• API gateway - Gateway
• Order service - RestClient for blocking service communication techniques
• Random service - Simple Dockerized RestClient
• Refresh User service - Dynamic configuration with @RefreshScope
• Reactive Order service - WebClient, reactive approach to non-blocking communication
• Product service - RabbitMQ, event-driven approach to non-blocking communication (publisher)
• Email service - RabbitMQ, event-driven approach to non-blocking communication (subscriber)
• Inventory service - RabbitMQ, Pub/Sub vs Point-To-Point
• Activity service - Kafka, event streaming approach (producer)
• Audit service - Kafka (consumer - replayability)
• Analytic service - Kafka (consumer - aggregation - stream processing)
• Resilient Order service - Resilience4j (timeout and retry)
• Breaker Order service - Resilience4j (add fail fast by circuit breaker)
• Fallback Order service - Resilience4j (add fallback strategy)
• Bulkhead Order service - Resilience4j (add bulkhead support)
• Tracing User service - Micrometer Tracing
• Tracing Order service - Micrometer Tracing and Zipkin

Requirements

• Docker
• RabbitMQ: docker run -d --name rabbitmq -p 5672:5672 -p 15672:15672 rabbitmq:management
• Kafka: docker run --rm confluentinc/cp-kafka:7.5.0 kafka-storage random-uuid
  • See docker-compose.yaml for details
• Zipkin: docker run -d --name zipkin -p 9411:9411 openzipkin/zipkin

Startup

• Start Docker Desktop (if on Windows/MacOS)
• Start RabbitMQ: docker start rabbitmq
• Start Kafka: docker compose up -d (in the repository root)
• Start the Spring Services:
  • eureka-server
  • config-server
  • all the services (the dockerized ones should start in Docker!)
  • api-gateway

Shutdown

• Stop the services
• Stop Kafka: docker compose down
• Stop RabbitMQ and Zipkin: docker stop
• Stop Docker Desktop