Microservices

Ebooks

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System Design

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

Architecture, Design and Principles

• Screaming Architecture
• Clean Architecture
• Event-Driven Architecture
• Clean Code
• Domain-Driven Design
• SOLID Principles
• Separation of Concerns
• Common Closure Principle
• Common Reuse Principle
• Test Pyramid

Patterns

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

Technologies and Tools

• Java
• Spring Boot
• Kong
• Keycloak
• OAuth2
• JWT
• Kafka
• MongoDB
• Debezium
• Redis
• Elastic
• Swagger
• Testcontainers
• 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

• 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

| Method | Endpoint | Description | |:-----------------------------------------------------:|-------------|-------------| | | /auth | Get | | | /auth | Auth | | | /users | Save | | | /users/{id} | Delete |

ConfigurationService

Localhost: http://localhost:8015

Docker: http://localhost:9015

Kong: http://localhost:8000/configurationservice

| Method | Endpoint | Description | |:-----------------------------------------------------:|--------------------------------|---------------| | | /configurations | Get | | | /configurations/broadcast | Broadcast | | | /features | List | | | /features | Create | | | /features/{id} | Get | | | /features/{id} | Delete | | | /features/{id}/disable | Disable | | | /features/{id}/enable | Enable | | | /features/{id}/enabled | Enabled | | | /features/groups/{group} | List By Group | | | /properties | List | | | /properties | Create | | | /properties/{id} | Get | | | /properties/{id} | Delete | | | /properties/{id}/value/{value} | Update Value |

CustomerService

Localhost: http://localhost:8020

Docker: http://localhost:9020

Kong: http://localhost:8000/customerservice

| Method | Endpoint | Description | |:-----------------------------------------------------:|-----------------|-------------| | | /customers | List | | | /customers | Create | | | /customers/{id} | Get | | | /customers/{id} | Update | | | /customers/{id} | Delete |

ProductService

Localhost: http://localhost:8025

Docker: http://localhost:9025

Kong: http://localhost:8000/productservice

| Method | Endpoint | Description | |:-----------------------------------------------------:|----------------|-------------| | | /products | List | | | /products | Create | | | /products/{id} | Get | | | /products/{id} | Update | | | /products/{id} | Delete |

OrderService

Localhost: http://localhost:8030

Docker: http://localhost:9030

Kong: http://localhost:8000/orderservice

| Method | Endpoint | Description | |:-------------------------------------------------:|--------------|-------------| | | /orders | List | | | /orders | Create | | | /orders/{id} | Get |

PaymentService

Localhost: http://localhost:8035

Docker: http://localhost:9035

Kong: http://localhost:8000/paymentservice

| Method | Endpoint | Description | |-------------------------------------------------|-------------------------------------------|-----------------| | | /payments | List | | | /payments/{id} | Get | | ![GET](https://img.shields.io/badg