GitHub - khan-sk-dev/real-time-supply-tracker: Spring Boot microservices ecosystem with Kafka, Eureka, Zipkin, API Gateway & Circuit Breakers. Production-ready supply chain demo.

🌟 A production-ready microservices architecture built with Spring Cloud 🌟

Scalable • Resilient • Observable • Event-Driven

🎯 Overview

This project demonstrates a real-world microservices architecture for supply chain management, showcasing best practices in distributed systems design. Built with Spring Cloud ecosystem, it provides a robust foundation for scalable enterprise applications.

🌟 What Makes This Special?

🔄 Event-Driven Architecture with Apache Kafka
🛡️ Fault Tolerance with Circuit Breakers
🔍 Full Observability with distributed tracing
🚪 API Gateway as single entry point
📊 Centralized Logging with ELK Stack
🔐 Secure Authentication & Authorization
⚙️ Externalized Configuration management

✨ Key Features

🏪 Business Services

🛍️ Product Catalog - MongoDB-powered product management
📦 Order Processing - Complete order lifecycle management
📋 Inventory Tracking - Real-time stock management
🔔 Smart Notifications - Event-driven customer alerts

🛠️ Infrastructure Services

🚪 API Gateway - Request routing & filtering
🔍 Service Discovery - Dynamic service registration
⚙️ Config Server - Centralized configuration
🔐 Auth Server - Security & token management

🏗️ Architecture

🌐 System Overview

graph TB
    Client[👤 Client] --> Gateway[🚪 API Gateway]
    
    Gateway --> Auth[🔐 Auth Server]
    Gateway --> Product[🛍️ Product Service]
    Gateway --> Order[📦 Order Service]
    
    Order -->|Sync Call| Inventory[📋 Inventory Service]
    Order -->|Async Event| Kafka[🔄 Kafka]
    Kafka --> Notification[🔔 Notification Service]
    
    Product --> MongoDB[(🍃 MongoDB)]
    Order --> MySQL1[(🗄️ MySQL)]
    Inventory --> MySQL2[(🗄️ MySQL)]
    
    subgraph "🛠️ Infrastructure"
        Eureka[🔍 Eureka Server]
        Config[⚙️ Config Server]
        Zipkin[📊 Zipkin]
        ELK[📈 ELK Stack]
    end
    
    subgraph "🔧 External Config"
        GitHub[📁 GitHub]
        Vault[🔐 HashiCorp Vault]
    end
    
    Config --> GitHub
    Config --> Vault
    
    style Client fill:#e1f5fe
    style Gateway fill:#f3e5f5
    style Kafka fill:#fff3e0
    style ELK fill:#e8f5e8

🏛️ Service Architecture Pattern

Each microservice follows a clean, layered architecture:

┌─────────────────────────────────────┐
│             🌐 API Layer            │
│        (Controllers & DTOs)         │
├─────────────────────────────────────┤
│           💼 Business Layer         │
│        (Services & Domain)          │
├─────────────────────────────────────┤
│         🗄️ Persistence Layer       │
│      (Repositories & Entities)      │
├─────────────────────────────────────┤
│        🔌 Integration Layer         │
│    (Message Queues & External)     │
└─────────────────────────────────────┘

🛠️ Tech Stack

Core Framework

Messaging & Events

Databases

Infrastructure

Monitoring & Observability

Security & Config

🚀 Quick Start

📋 Prerequisites

Requirement	Version	Purpose
☕ Java JDK	17+	Runtime environment
🐳 Docker	20.10+	Containerization
🐳 Docker Compose	2.0+	Multi-container orchestration
🔨 Maven	3.8+	Build automation
💾 Available RAM	8GB+	Running all services

⚡ One-Command Setup

# Clone the repository
git clone https://github.com/your-username/spring-boot-microservices.git
cd spring-boot-microservices

# Start the entire stack
make up
# OR
docker-compose up -d && ./scripts/start-services.sh

🔧 Manual Setup

Click to expand manual setup instructions

1️⃣ Infrastructure Services

# Start backing services
docker-compose up -d mongodb mysql kafka zookeeper elasticsearch kibana zipkin

# Wait for services to be ready
./scripts/wait-for-services.sh

2️⃣ Core Services (in order)

# 1. Configuration Server
cd config-server && mvn spring-boot:run &

# 2. Discovery Server
cd discovery-server && mvn spring-boot:run &

# 3. Gateway
cd api-gateway && mvn spring-boot:run &

# 4. Business Services
cd product-service && mvn spring-boot:run &
cd inventory-service && mvn spring-boot:run &
cd order-service && mvn spring-boot:run &
cd notification-service && mvn spring-boot:run &

🎯 Verify Installation

After startup, check these endpoints:

Service	URL	Status
🚪 API Gateway	http://localhost:8080
🔍 Eureka Dashboard	http://localhost:8761
📊 Zipkin Tracing	http://localhost:9411
📈 Kibana Logs	http://localhost:5601

📊 Service Details

🛍️ Product Service

Purpose: Manages product catalog and inventory display

Tech Stack: Spring Boot + MongoDB + Spring Data MongoDB

Key Features:

✅ Product CRUD operations
✅ Category management
✅ Search and filtering
✅ Product recommendations

API Endpoints:

GET    /api/products           # List all products
GET    /api/products/{id}      # Get product details
POST   /api/products           # Create new product
PUT    /api/products/{id}      # Update product
DELETE /api/products/{id}      # Delete product
GET    /api/products/search    # Search products

📦 Order Service

Purpose: Handles complete order lifecycle management

Tech Stack: Spring Boot + MySQL + JPA + Kafka Producer

Key Features:

✅ Order creation and management
✅ Inventory validation (sync call)
✅ Payment processing integration
✅ Order status tracking
✅ Event publishing for notifications

API Endpoints:

POST   /api/orders             # Create new order
GET    /api/orders/{id}        # Get order details
GET    /api/orders/user/{id}   # Get user orders
PUT    /api/orders/{id}/status # Update order status
DELETE /api/orders/{id}        # Cancel order

📋 Inventory Service

Purpose: Real-time inventory tracking and management

Tech Stack: Spring Boot + MySQL + JPA + Redis Cache

Key Features:

✅ Stock level management
✅ Real-time availability checks
✅ Low stock alerts
✅ Inventory reservations
✅ Audit trail for stock changes

API Endpoints:

GET    /api/inventory/{productId}     # Check stock
POST   /api/inventory/reserve         # Reserve stock
POST   /api/inventory/release         # Release reservation
PUT    /api/inventory/{productId}     # Update stock
GET    /api/inventory/low-stock       # Get low stock items

🔔 Notification Service

Purpose: Multi-channel customer notifications

Tech Stack: Spring Boot + Kafka Consumer + Email/SMS APIs

Key Features:

✅ Email notifications
✅ SMS alerts
✅ Push notifications
✅ Notification templates
✅ Delivery tracking

Supported Events:

📧 Order confirmation
📱 Shipping updates
⚠️ Low stock alerts
🎉 Promotional offers

🔧 Configuration

🌍 Environment Profiles

Profile	Purpose	Config Source
`local`	Development	Local files
`dev`	Development server	Config Server + GitHub
`staging`	Pre-production	Config Server + Vault
`prod`	Production	Config Server + Vault + Encryption

⚙️ Key Configuration Files

config-repo/
├── application.yml                 # Global configuration
├── application-{profile}.yml       # Profile-specific config
├── api-gateway.yml                # Gateway routing rules
├── product-service.yml            # Product service config
├── order-service.yml              # Order service config
└── inventory-service.yml          # Inventory service config

🔐 Security Configuration

# Example security configuration
security:
  oauth2:
    client:
      registration:
        gateway:
          client-id: ${OAUTH2_CLIENT_ID}
          client-secret: ${OAUTH2_CLIENT_SECRET}
          scope: read,write
    resource-server:
      jwt:
        issuer-uri: ${JWT_ISSUER_URI}

📈 Monitoring & Observability

🔍 Distributed Tracing

Zipkin Integration provides end-to-end request tracing:

📊 Request flow visualization
⏱️ Latency analysis
🔍 Error detection
📈 Performance bottleneck identification

📊 Metrics & Monitoring

Prometheus + Grafana stack for metrics:

📈 JVM metrics
🌐 HTTP request metrics
💾 Database connection pools
🔄 Kafka consumer lag
💿 Custom business metrics

📝 Centralized Logging

ELK Stack for log aggregation:

{
  "timestamp": "2024-01-15T10:30:00Z",
  "service": "order-service",
  "traceId": "abc123def456",
  "spanId": "789ghi012jkl",
  "level": "INFO",
  "message": "Order created successfully",
  "userId": "user-123",
  "orderId": "order-456"
}

🏥 Health Checks

Each service exposes comprehensive health endpoints:

GET /actuator/health      # Overall health
GET /actuator/info        # Service information
GET /actuator/metrics     # Prometheus metrics
GET /actuator/env         # Environment details

🧪 Testing

🧪 Test Strategy

🔬 Unit Tests

JUnit 5
Mockito
Testcontainers
90%+ coverage

🔄 Integration Tests

Spring Boot Test
Test slices
Database testing
API contract testing

🌐 E2E Tests

REST Assured
Cucumber
Docker Compose
Full stack testing

🚀 Running Tests

# Run all tests
mvn clean test

# Run specific test categories
mvn test -Dgroups="unit"
mvn test -Dgroups="integration"
mvn test -Dgroups="e2e"

# Generate coverage report
mvn jacoco:report

📊 Test Coverage

Service	Unit Tests	Integration Tests	Coverage
Product Service	✅ 45 tests	✅ 12 tests	92%
Order Service	✅ 38 tests	✅ 15 tests	88%
Inventory Service	✅ 32 tests	✅ 10 tests	90%
Notification Service	✅ 28 tests	✅ 8 tests	85%

📁 Project Structure

spring-boot-microservices/
├── 📁 services/
│   ├── 🚪 api-gateway/              # Spring Cloud Gateway
│   ├── 🔐 auth-server/              # OAuth2 Authorization Server
│   ├── ⚙️ config-server/            # Spring Cloud Config
│   ├── 🔍 discovery-server/         # Eureka Discovery Server
│   ├── 🛍️ product-service/          # Product management
│   ├── 📦 order-service/            # Order processing
│   ├── 📋 inventory-service/        # Inventory management
│   └── 🔔 notification-service/     # Notification handling
├── 📁 infrastructure/
│   ├── 🐳 docker/                   # Docker configurations
│   ├── ☸️ kubernetes/               # K8s manifests
│   └── 📊 monitoring/               # Grafana dashboards
├── 📁 config-repo/                  # External configuration
├── 📁 scripts/                      # Automation scripts
├── 📁 docs/                         # Documentation
├── 🐳 docker-compose.yml            # Local development stack
├── 📋 Makefile                      # Build automation
└── 📖 README.md                     # This file

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

🌟 How to Contribute

🍴 Fork the repository
🌿 Create a feature branch: git checkout -b feature/amazing-feature
💫 Make your changes with tests
✅ Ensure all tests pass: mvn clean verify
📝 Commit your changes: git commit -m 'feat: add amazing feature'
🚀 Push to the branch: git push origin feature/amazing-feature
📬 Open a Pull Request

📋 Development Guidelines

Follow Conventional Commits
Maintain test coverage above 85%
Update documentation for new features
Follow the existing code style

🐛 Reporting Issues

Found a bug? Please open an issue with:

🔍 Description: What went wrong?
🔄 Steps to reproduce: How can we recreate it?
🎯 Expected behavior: What should happen?
💻 Environment: OS, Java version, etc.

🏆 Acknowledgments

Special thanks to:

🌟 Spring Team for the amazing Spring Cloud ecosystem
🚀 Netflix OSS for pioneering microservices patterns
🐳 Docker Community for containerization standards
👥 All Contributors who make this project better

⭐ If you found this project helpful, please give it a star! ⭐

Happy coding! 🚀

Name		Name	Last commit message	Last commit date
Latest commit History 10 Commits
api-gateway		api-gateway
discovery-server		discovery-server
inventory-service		inventory-service
notification-service		notification-service
order-service		order-service
product-service		product-service
README.md		README.md
docker-compose.yml		docker-compose.yml
pom.xml		pom.xml

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🌟 A production-ready microservices architecture built with Spring Cloud 🌟

📋 Table of Contents

🎯 Overview

🌟 What Makes This Special?

✨ Key Features

🏪 Business Services

🛠️ Infrastructure Services

🏗️ Architecture

🌐 System Overview

🏛️ Service Architecture Pattern

🛠️ Tech Stack

Core Framework

Messaging & Events

Databases

Infrastructure

Monitoring & Observability

Security & Config

🚀 Quick Start

📋 Prerequisites

⚡ One-Command Setup

🔧 Manual Setup

1️⃣ Infrastructure Services

2️⃣ Core Services (in order)

🎯 Verify Installation

📊 Service Details

🔧 Configuration

🌍 Environment Profiles

⚙️ Key Configuration Files

🔐 Security Configuration

📈 Monitoring & Observability

🔍 Distributed Tracing

📊 Metrics & Monitoring

📝 Centralized Logging

🏥 Health Checks

🧪 Testing

🧪 Test Strategy

🚀 Running Tests

📊 Test Coverage

📁 Project Structure

🤝 Contributing

🌟 How to Contribute

📋 Development Guidelines

🐛 Reporting Issues

🏆 Acknowledgments

⭐ If you found this project helpful, please give it a star! ⭐

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