Microservices

Flow

sequenceDiagram
    participant Client
    participant AuthService
    participant CustomerService
    participant ProductService
    participant OrderService
    participant PaymentService
    participant Kafka

    Client->>AuthService: POST /auth
    AuthService-->>Client: JWT

    Client->>CustomerService: POST /customers
    CustomerService-->>Client: Customer Created

    Client->>ProductService: POST /products
    ProductService-->>Client: Product Created

    Client->>OrderService: POST /orders
    OrderService-->>Client: Order Created
    OrderService->>Kafka: OrderEvent Published

    Kafka-->>PaymentService: OrderEvent Consumed
    Note right of PaymentService: Payment Created

    Client->>PaymentService: PUT /payments/order/{orderId}/status/{status}
    PaymentService-->>Client: Payment Status Updated
    PaymentService->>Kafka: PaymentEvent Published

    Kafka-->>OrderService: PaymentEvent Consumed
    Note right of OrderService: Status Updated

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Architecture and Principles

• Clean Architecture
• Event-Driven Architecture
• Common Closure Principle
• Common Reuse Principle
• Separation of Concerns
• Clean Code
• SOLID Principles
• Resilience
• Idempotency

Design Patterns

• Mediator Pattern
• Result Pattern
• Strategy Pattern
• Outbox Pattern
• Retry Pattern
• Circuit Breaker Pattern

Technologies and Tools

• Java
• Spring Boot
• Kong
• Keycloak
• OAuth2
• JWT
• Kafka
• MongoDB
• Redis
• Elastic
• Swagger
• Docker
• Kubernetes

Docker

docker compose up --detach --build --remove-orphans

Starter

Install Into Local Maven Repository: mvn clean install

Tools

• Kong: http://localhost:8002

• Keycloak: http://localhost:8005

  • Username: admin

  • Password: password

  • Role: Manage Realms > microservices > Clients > authservice > Service Accounts Roles > Assign Role > manage-users

• Kafka: http://localhost:9000

• Mongo: http://localhost:27018

• Redis: http://localhost:6380

• Logs: http://localhost:5601/app/management/data/index_management/data_streams

• APM: http://localhost:5601/app/apm/services

Services

AuthService

Localhost: http://localhost:8010

Docker: http://localhost:9010

Kong: http://localhost:8000/authservice

ConfigurationService

Localhost: http://localhost:8015

Docker: http://localhost:9015

Kong: http://localhost:8000/configurationservice

CustomerService

Localhost: http://localhost:8020

Docker: http://localhost:9020

Kong: http://localhost:8000/customerservice

ProductService

Localhost: http://localhost:8025

Docker: http://localhost:9025

Kong: http://localhost:8000/productservice

OrderService

Localhost: http://localhost:8030

Docker: http://localhost:9030

Kong: http://localhost:8000/orderservice

PaymentService

Localhost: http://localhost:8035

Docker: http://localhost:9035

Kong: http://localhost:8000/paymentservice