Java Spring Boot - Microservices Patterns
category: Programming
tags: spring boot, microservices, architecture, java
Circuit Breaker Pattern
Prevents cascading failures in distributed systems
- States: Closed, Open, Half-Open
- Implementation: Use Hystrix or Resilience4j
- Configuration: Failure threshold, timeout, recovery time
@Component
public class UserService {
@CircuitBreaker(name = "userService", fallbackMethod = "fallbackUser")
public User getUser(Long id) {
return userRepository.findById(id);
}
public User fallbackUser(Long id, Exception ex) {
return new User("Unknown User");
}
}
API Gateway Pattern
Single entry point for all clients
- Responsibilities: Authentication, routing, rate limiting, logging
- Tools: Spring Cloud Gateway, Zuul, Kong
- Benefits: Simplified client code, centralized concerns
Service Discovery
Client-side
- Netflix Eureka
- Consul
Server-side
- AWS ELB
- Kubernetes services
Health checks
- Regular service health monitoring
Saga Pattern
Manages distributed transactions
- Choreography: Each service publishes events
- Orchestration: Central coordinator manages flow
- Compensation: Rollback mechanisms for failures
Last updated: 2025-08-26 20:00 UTC