Spring Cloud构建微服务架构（三）断路器

Author: zhaiyongchao

Chapter9-1-3/eureka-feign/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.didispace</groupId>
+	<artifactId>eureka-feign</artifactId>
+	<version>1.0.0</version>
+	<packaging>jar</packaging>
+
+	<name>eureka-feign</name>
+	<description>Spring Cloud project</description>
+
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>1.3.5.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.8</java.version>
+	</properties>
+
+	<dependencies>
+		<!--<dependency>-->
+			<!--<groupId>org.springframework.cloud</groupId>-->
+			<!--<artifactId>spring-cloud-starter-hystrix</artifactId>-->
+		<!--</dependency>-->
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-starter-feign</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-starter-eureka</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-dependencies</artifactId>
+				<version>Brixton.RELEASE</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

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);
+    }
+
+}