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Spring Cloud构建微服务架构（三）断路器
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‎Chapter9-1-3/eureka-ribbon/pom.xml

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

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

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

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

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

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

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

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