Spring Cloud构建微服务架构（三）断路器

Chapter9-1-3/eureka-ribbon/src/main/java/com/didispace/RibbonApplication.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
+import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+import org.springframework.cloud.client.loadbalancer.LoadBalanced;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+@SpringBootApplication
+@EnableDiscoveryClient
+@EnableCircuitBreaker
+public class RibbonApplication {
+
+	@Bean
+	@LoadBalanced
+	RestTemplate restTemplate() {
+		return new RestTemplate();
+	}
+
+	public static void main(String[] args) {
+		SpringApplication.run(RibbonApplication.class, args);
+	}
+
+}

Chapter9-1-3/eureka-ribbon/src/main/java/com/didispace/service/ComputeService.java

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+package com.didispace.service;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class ComputeService {
+
+    @Autowired
+    RestTemplate restTemplate;
+
+    @HystrixCommand(fallbackMethod = "addServiceFallback")
+    public String addService() {
+        return restTemplate.getForEntity("http://COMPUTE-SERVICE/add?a=10&b=20", String.class).getBody();
+    }
+
+    public String addServiceFallback() {
+        return "error";
+    }
+
+}

Chapter9-1-3/eureka-ribbon/src/main/java/com/didispace/web/ConsumerController.java

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+package com.didispace.web;
+
+import com.didispace.service.ComputeService;
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.Map;
+
+@RestController
+public class ConsumerController {
+
+    @Autowired
+    private ComputeService computeService;
+
+    @RequestMapping(value = "/add", method = RequestMethod.GET)
+    public String add() {
+        return computeService.addService();
+    }
+
+}