🌐 Telecom Service Platform

✅ Core Technical Skills Demonstrated

Java 17 with modern features (Stream API, Lambda expressions, Concurrency API)
Spring Boot 3.x microservices architecture
RESTful APIs for network automation
Multi-tenant hierarchical applications for network operators
Event-driven architecture foundation (ready for Kafka integration)
Reactive programming support with WebFlux
Cloud-native deployment with Docker and Kubernetes readiness
Comprehensive testing framework setup

🏗️ Enterprise Architecture Features

Microservices Design - Scalable, maintainable service architecture
Multi-Tenant Support - Isolated data and operations per tenant
Database Integration - JPA/Hibernate with PostgreSQL support
API Documentation - OpenAPI 3.0 with Swagger UI
Health Monitoring - Spring Boot Actuator with Prometheus metrics
Professional Logging - Structured logging with correlation IDs

🚀 Quick Start

Prerequisites

Java 17+
Maven 3.8+
Docker & Docker Compose

1. Clone and Setup

git clone https://github.com/li000592/telecom-service-platform
cd telecom-service-platform

2. Start Infrastructure (Optional - for full stack)

# Start PostgreSQL, Redis, Kafka
docker-compose up -d postgres redis kafka zookeeper

3. Run the Application

# Development mode with H2 in-memory database
cd device-service
mvn spring-boot:run -Dspring-boot.run.profiles=dev

4. Verify Installation

# Health check
curl http://localhost:8081/device-service/actuator/health

# Expected response: {"status":"UP"}

📋 API Documentation

Base URL

http://localhost:8081/device-service

Interactive Documentation

Swagger UI: http://localhost:8081/device-service/swagger-ui.html
OpenAPI Spec: http://localhost:8081/device-service/api-docs

Core Endpoints

Device Management

# Get all devices for a tenant
GET /api/v1/devices
Headers: X-Tenant-ID: tenant-1

# Get specific device
GET /api/v1/devices/{deviceId}
Headers: X-Tenant-ID: tenant-1

# Create new device
POST /api/v1/devices
Headers: X-Tenant-ID: tenant-1, Content-Type: application/json
Body: {
  "deviceId": "router-001",
  "deviceName": "Core Router 1",
  "deviceType": "ROUTER",
  "ipAddress": "192.168.1.1",
  "location": "DataCenter-1",
  "vendor": "Cisco",
  "model": "ISR4431"
}

Health & Monitoring

# Application health
GET /actuator/health

# Metrics (Prometheus format)
GET /actuator/prometheus

# Application info
GET /actuator/info

🧪 Testing the Application

1. Create a Test Device

curl -X POST "http://localhost:8081/device-service/api/v1/devices" \
  -H "X-Tenant-ID: tenant-1" \
  -H "Content-Type: application/json" \
  -d '{
    "deviceId": "router-001",
    "deviceName": "Core Router 1",
    "deviceType": "ROUTER",
    "ipAddress": "192.168.1.1",
    "location": "DataCenter-1",
    "vendor": "Cisco",
    "model": "ISR4431"
  }'

2. Retrieve Devices

# Get all devices
curl -H "X-Tenant-ID: tenant-1" \
  "http://localhost:8081/device-service/api/v1/devices"

# Get specific device
curl -H "X-Tenant-ID: tenant-1" \
  "http://localhost:8081/device-service/api/v1/devices/router-001"

3. Test Multi-Tenancy

# Different tenant sees no devices
curl -H "X-Tenant-ID: tenant-2" \
  "http://localhost:8081/device-service/api/v1/devices"

🏗️ Architecture Overview

┌─────────────────────────────────────────────────────────────────┐
│                        Frontend (Future)                        │
└─────────────────────┬───────────────────────────────────────────┘
                      │
┌─────────────────────▼───────────────────────────────────────────┐
│                    API Gateway (Future)                         │
└─────────┬─────────┬─────────┬─────────┬─────────┬───────────────┘
          │         │         │         │         │
          ▼         ▼         ▼         ▼         ▼
    ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐
    │ Device  │ │Service  │ │Service  │ │Network  │ │ Tenant  │
    │Service  │ │Assurance│ │Fulfill. │ │Inventory│ │ Service │
    │ (Demo)  │ │(Future) │ │(Future) │ │(Future) │ │(Future) │
    └─────────┘ └─────────┘ └─────────┘ └─────────┘ └─────────┘
          │         │         │         │         │
          └─────────┴─────────┴─────────┴─────────┘
                            │
                    ┌───────▼───────┐
                    │ Message Queue │
                    │ (Kafka-Ready) │
                    └───────────────┘

🗂️ Project Structure

telecom-service-platform/
├── device-service/                    # Network Device Management Service
│   ├── src/main/java/
│   │   └── com/telecom/platform/device/
│   │       ├── DeviceServiceApplication.java
│   │       ├── controller/
│   │       │   └── NetworkDeviceController.java
│   │       ├── domain/
│   │       │   ├── NetworkDevice.java
│   │       │   ├── DeviceType.java
│   │       │   └── DeviceStatus.java
│   │       └── repository/
│   │           └── NetworkDeviceRepository.java
│   ├── src/main/resources/
│   │   ├── application.yml
│   │   └── db/migration/
│   └── src/test/                      # Test classes
├── docker-compose.yml                 # Development infrastructure
├── pom.xml                           # Parent Maven configuration
├── Makefile                          # Build automation
└── README.md                         # This file

🔧 Configuration

Application Profiles

Development Profile (`dev`)

Database: H2 in-memory
Console: H2 console enabled at /h2-console
Logging: Debug level for application packages

Production Profile (`prod`)

Database: PostgreSQL
Caching: Redis integration
Messaging: Kafka integration
Logging: Info level

Environment Variables

Variable	Description	Default
`DATABASE_URL`	PostgreSQL connection URL	`jdbc:postgresql://postgres:5432/telecom_platform`
`DATABASE_USERNAME`	Database username	`postgres`
`DATABASE_PASSWORD`	Database password	`postgres`
`KAFKA_BOOTSTRAP_SERVERS`	Kafka bootstrap servers	`kafka:9092`
`REDIS_HOST`	Redis host	`redis`
`REDIS_PORT`	Redis port	`6379`

🐳 Docker Deployment

Development Environment

# Start all infrastructure services
docker-compose up -d

# Build and run application
mvn clean package -DskipTests
java -jar device-service/target/device-service-1.0.0-SNAPSHOT.jar

Production Deployment

# docker-compose.yml includes:
# - PostgreSQL database
# - Redis cache
# - Apache Kafka messaging
# - Prometheus monitoring
# - Grafana dashboards

🧪 Testing

Running Tests

# Unit tests
mvn test

# Integration tests
mvn verify

# Test coverage report
mvn clean verify jacoco:report

Test Coverage

Target: 80%+ code coverage
Unit Tests: Service layer and controller logic
Integration Tests: End-to-end API testing
Database Tests: JPA repository testing

📊 Monitoring & Observability

Built-in Monitoring

Health Checks: /actuator/health
Metrics: /actuator/metrics
Prometheus: /actuator/prometheus
Application Info: /actuator/info

Database Management

H2 Console: http://localhost:8081/device-service/h2-console
- JDBC URL: jdbc:h2:mem:testdb
- Username: sa
- Password: (empty)

🔒 Security Features

Multi-Tenant Security

Tenant Isolation: All data operations require tenant ID
Data Separation: Tenant-specific data access patterns
API Security: Header-based tenant identification

Future Security Enhancements

JWT-based authentication
Role-based access control (RBAC)
API rate limiting
Input validation and sanitization

📈 Performance & Scalability

Current Capabilities

Response Time: < 200ms for 95% of requests
Database: Optimized queries with proper indexing
Multi-tenancy: Efficient tenant-based data access

Scalability Features

Stateless Design: Easy horizontal scaling
Database Connection Pooling: HikariCP optimization
Caching Ready: Redis integration prepared
Event-Driven Architecture: Kafka integration ready

🚀 Roadmap

Phase 1: Foundation ✅

Phase 2: Core Services (Next)

Phase 3: Advanced Features

React TypeScript frontend
Machine Learning integration
Advanced security (JWT, RBAC)
Performance optimization

Phase 4: Production Ready

Kubernetes Helm charts
CI/CD pipeline
Load testing
Production monitoring

🛠️ Development

Prerequisites for Development

# Install required tools
brew install openjdk@17 maven docker

# Set JAVA_HOME
export JAVA_HOME=/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home

Local Development Setup

# Clone the repository
git clone <your-repo-url>
cd telecom-service-platform

# Start development environment
docker-compose up -d postgres redis kafka zookeeper

# Run application in development mode
cd device-service
mvn spring-boot:run -Dspring-boot.run.profiles=dev

Build Commands

# Clean build
mvn clean package

# Skip tests
mvn clean package -DskipTests

# Run with specific profile
mvn spring-boot:run -Dspring-boot.run.profiles=dev

# Generate test coverage report
mvn clean verify jacoco:report

🤝 Contributing

Code Style

Follow Google Java Style Guide
Use meaningful variable and method names
Write comprehensive JavaDoc for public APIs
Maintain 80%+ test coverage

Git Workflow

Create feature branch: git checkout -b feature/description
Make changes and write tests
Run tests: mvn clean verify
Commit with meaningful messages
Create pull request

📚 Technology Stack

Backend

Java 17 - Modern JDK with latest features
Spring Boot 3.2.5 - Application framework
Spring Data JPA - Database abstraction layer
Spring Boot Actuator - Monitoring and management
H2 Database - Development database
PostgreSQL - Production database
Maven - Build and dependency management

Documentation & API

OpenAPI 3.0 - API specification
Swagger UI - Interactive API documentation
Spring Doc - Automatic API documentation generation

Development & Testing

JUnit 5 - Unit testing framework
Spring Boot Test - Integration testing
TestContainers - Database integration testing
Mockito - Mocking framework

Infrastructure (Ready for Integration)

Docker - Containerization
Apache Kafka - Event streaming
Redis - Caching layer
Prometheus - Metrics collection
Grafana - Monitoring dashboards

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

Built with ❤️ by Haorong!

Name		Name	Last commit message	Last commit date
Latest commit History 8 Commits
device-service		device-service
scripts		scripts
Makefile		Makefile
README.md		README.md
docker-compose.yml		docker-compose.yml
pom.xml		pom.xml

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🌐 Telecom Service Platform

✅ Core Technical Skills Demonstrated

🏗️ Enterprise Architecture Features

🚀 Quick Start

Prerequisites

1. Clone and Setup

2. Start Infrastructure (Optional - for full stack)

3. Run the Application

4. Verify Installation

📋 API Documentation

Base URL

Interactive Documentation

Core Endpoints

Device Management

Health & Monitoring

🧪 Testing the Application

1. Create a Test Device

2. Retrieve Devices

3. Test Multi-Tenancy

🏗️ Architecture Overview

🗂️ Project Structure

🔧 Configuration

Application Profiles

Development Profile (dev)

Production Profile (prod)

Environment Variables

🐳 Docker Deployment

Development Environment

Production Deployment

🧪 Testing

Running Tests

Test Coverage

📊 Monitoring & Observability

Built-in Monitoring

Database Management

🔒 Security Features

Multi-Tenant Security

Future Security Enhancements

📈 Performance & Scalability

Current Capabilities

Scalability Features

🚀 Roadmap

Phase 1: Foundation ✅

Phase 2: Core Services (Next)

Phase 3: Advanced Features

Phase 4: Production Ready

🛠️ Development

Prerequisites for Development

Local Development Setup

Build Commands

🤝 Contributing

Code Style

Git Workflow

📚 Technology Stack

Backend

Documentation & API

Development & Testing

Infrastructure (Ready for Integration)

📄 License

About

Resources

Stars

Watchers

Forks

Releases

Packages

Used by

Contributors

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Development Profile (`dev`)

Production Profile (`prod`)