tomevault-io Spring Cloud Standards
Service Discovery (Eureka)
// Discovery Server
@SpringBootApplication
@EnableEurekaServer
public class DiscoveryServerApplication {}
// Client registration
@SpringBootApplication
@EnableDiscoveryClient
public class UserServiceApplication {}
# Client configuration
spring:
application:
name: user-service
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka
instance:
prefer-ip-address: true
Feign Client
@FeignClient(
name = "order-service",
fallbackFactory = OrderClientFallbackFactory.class
)
public interface OrderClient {
@GetMapping("/api/orders/{userId}")
List<Order> getOrdersByUser(@PathVariable Long userId);
@PostMapping("/api/orders")
Order createOrder(@RequestBody CreateOrderRequest request);
}
@Component
public class OrderClientFallbackFactory implements FallbackFactory<OrderClient> {
@Override
public OrderClient create(Throwable cause) {
return new OrderClient() {
@Override
public List<Order> getOrdersByUser(Long userId) {
log.warn("Fallback: returning empty orders", cause);
return List.of();
}
// ...
};
}
}
Circuit Breaker (Resilience4j)
@Service
public class PaymentService {
@CircuitBreaker(name = "payment", fallbackMethod = "fallback")
@Retry(name = "payment")
@TimeLimiter(name = "payment")
public CompletableFuture<PaymentResult> process(Payment payment) {
return CompletableFuture.supplyAsync(() -> paymentGateway.process(payment));
}
public CompletableFuture<PaymentResult> fallback(Payment payment, Throwable t) {
return CompletableFuture.completedFuture(PaymentResult.pending());
}
}
resilience4j:
circuitbreaker:
instances:
payment:
sliding-window-size: 10
failure-rate-threshold: 50
wait-duration-in-open-state: 30s
retry:
instances:
payment:
max-attempts: 3
wait-duration: 500ms
References
- Service Discovery - Eureka, Consul patterns
- Circuit Breaker - Resilience4j configuration
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