Spring Cloud构建微服务架构（三）断路器

Chapter9-1-3/eureka-feign/src/main/java/com/didispace/FeignApplication.java

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+package com.didispace;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+import org.springframework.cloud.netflix.feign.EnableFeignClients;
+
+@SpringBootApplication
+@EnableDiscoveryClient
+@EnableFeignClients
+public class FeignApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(FeignApplication.class, args);
+	}
+
+}

Chapter9-1-3/eureka-feign/src/main/java/com/didispace/service/ComputeClient.java

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+package com.didispace.service;
+
+import org.springframework.cloud.netflix.feign.FeignClient;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@FeignClient(value = "compute-service", fallback = ComputeClientHystrix.class)
+public interface ComputeClient {
+
+    @RequestMapping(method = RequestMethod.GET, value = "/add")
+    Integer add(@RequestParam(value = "a") Integer a, @RequestParam(value = "b") Integer b);
+
+}

Chapter9-1-3/eureka-feign/src/main/java/com/didispace/service/ComputeClientHystrix.java

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+package com.didispace.service;
+
+import org.springframework.stereotype.Component;
+import org.springframework.web.bind.annotation.RequestParam;
+
+@Component
+public class ComputeClientHystrix implements ComputeClient {
+
+    @Override
+    public Integer add(@RequestParam(value = "a") Integer a, @RequestParam(value = "b") Integer b) {
+        return -9999;
+    }
+
+}

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

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+package com.didispace.web;
+
+import com.didispace.service.ComputeClient;
+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;
+
+@RestController
+public class ConsumerController {
+
+    @Autowired
+    ComputeClient computeClient;
+
+    @RequestMapping(value = "/add", method = RequestMethod.GET)
+    public Integer add() {
+        return computeClient.add(10, 20);
+    }
+
+}