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Spring Cloud

Spring Cloud provides tools for developers to quickly build common patterns in distributed systems, such as service discovery, configuration management, circuit breakers, and API gateways. It simplifies the development of microservices architectures.

Key Features

Service Discovery

Automatic service registration and discovery with Eureka, Consul, or Zookeeper.

Configuration Management

Centralized configuration management with Spring Cloud Config Server.

Circuit Breaker

Resilience patterns with Hystrix or Resilience4j to prevent cascading failures.

API Gateway

Spring Cloud Gateway for routing, load balancing, and cross-cutting concerns.

Use Cases

Microservices Architecture: Building distributed systems with multiple services
Service Mesh: Implementing service-to-service communication patterns
Distributed Configuration: Managing configuration across multiple environments
Load Balancing: Distributing requests across service instances
API Management: Creating API gateways for microservices

Example Usage

Enable service discovery with Eureka:

@SpringBootApplication
@EnableEurekaClient
public class UserServiceApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserServiceApplication.class, args);
    }
}

Use Feign client for service-to-service communication:

@FeignClient(name = "order-service")
public interface OrderClient {
    @GetMapping("/orders/user/{userId}")
    List<Order> getUserOrders(@PathVariable Long userId);
}

Dependencies

Add Spring Cloud dependencies:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

Configuration

Configure Eureka client in application.properties:

spring.application.name=user-service
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
eureka.instance.prefer-ip-address=true