Feign Hystrix

1、Feign整合Hystrix

添加依赖
编写接口与实现回退

1.1、调用者引入依赖

<!-- Feign -->

<dependency>

    <groupId>org.springframework.cloud</groupId>

    <artifactId>spring-cloud-starter-feign</artifactId>

</dependency>

1.2、启动类使用注解

package com.atm.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.web.servlet.ServletComponentScan;

import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.cloud.netflix.feign.EnableFeignClients;

import org.springframework.context.annotation.Bean;

import org.springframework.web.client.RestTemplate;

@SpringBootApplication

@EnableEurekaClient

@EnableCircuitBreaker//打开Hystrix断路器

@ServletComponentScan//扫描缓存

@EnableFeignClients//打开Feign注解

public class HystrixInvokerApp {

    @Bean

    @LoadBalanced

    public RestTemplate getRestTemplate() {

        return new RestTemplate();

    }

    public static void main(String[] args) {

        new SpringApplicationBuilder(HystrixInvokerApp.class).web(true).run(

                args);

    }

}

1.3、新建Feign接口（测试回退）

1.3.1、回顾服务提供者MyRestController

去调用服务提供者的接口，以下代码是服务提供者的接口代码

package com.atm.cloud;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class MyRestController {

    @RequestMapping(value = "/person/{personId}", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)

    public Person findPerson(@PathVariable("personId") Integer personId) {

        Person person = new Person();

        person.setId(personId);

        person.setAge(18);

        person.setName("atm");

        return person;

    }

    @GetMapping("/hello")

    @ResponseBody

    public String sayHello(){

        return "Hello World!";

    }

}

1.3.2、回顾服务调用者HelloClient

package com.atm.cloud.feignCtr;

import org.springframework.cloud.netflix.feign.FeignClient;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

@FeignClient("atm-eureka-hystrix-provider")

public interface HelloClient {

    @RequestMapping(method=RequestMethod.GET,value="/hello")

    String sayHello();

}

1.3.3、回顾服务调用者FeignController

package com.atm.cloud.feignCtr;

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 FeignController {

    @Autowired

    private HelloClient helloClient;

    @RequestMapping(value = "ivHello", method = RequestMethod.GET)

    public String ivHello() {

        return helloClient.sayHello();

    }

}

1.3.4、修改application.yml

server:

 port: 9000

spring:

 application:

  name: atm-eureka-hystrix-invoker

##开启feign开关

feign:

  hystrix:

    enabled: true

eureka:

 client:

  serviceUrl:

   defaultZone: http://localhost:8761/eureka/

1.3.5、新增HelloClientFallBack

package com.atm.cloud.feignCtr;

import org.springframework.stereotype.Component;

//HelloClient类去Spring容器中寻找HelloClientFallBack

//所以添加注解Component

@Component

public class HelloClientFallBack implements HelloClient {

    public String sayHello() {

        return "fallBack Hello";

    }

}

1.3.6、修改HelloClient

package com.atm.cloud.feignCtr;

import org.springframework.cloud.netflix.feign.FeignClient;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

//当HellClien访问atm-eureka-hystrix-provider失败时，需要有一个后备服务

//后备服务需要实现该接口

@FeignClient(name = "atm-eureka-hystrix-provider", fallback = HelloClientFallBack.class)

public interface HelloClient {

    @RequestMapping(method = RequestMethod.GET, value = "/hello")

    String sayHello();

}

1.4、测试断路器

断路器打开的要求
1. 10秒内连续20个同样的请求
2. 失败率过50%
断路器关闭
1. 休眠期5分钟
2. 5分钟后尝试请求，请求成功则关闭

1.4.1、服务提供者MyRestController

package com.atm.cloud;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class MyRestController {

    @GetMapping("/tmhello")

    @ResponseBody

    public String timeOutHello() throws InterruptedException {

        // 此方法处理最少需要1s

        Thread.sleep(1000);

        return "TimeOut Hello";

    }

}

1.4.2、服务调用者HelloClient

package com.atm.cloud.feignCtr;

import org.springframework.cloud.netflix.feign.FeignClient;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

//当HellClien访问atm-eureka-hystrix-provider失败时，需要有一个后备服务

//后备服务需要实现该接口

@FeignClient(name = "atm-eureka-hystrix-provider", fallback = HelloClientFallBack.class)

public interface HelloClient {

    @RequestMapping(method = RequestMethod.GET, value = "/tmhello")

    String toHello();

}

package com.atm.cloud.feignCtr;

import org.springframework.stereotype.Component;

@Component

public class HelloClientFallBack implements HelloClient {

    public String toHello() {

        return "fallBack timeOut Hello";

    }

}

1.4.3、服务调用者FeignController

package com.atm.cloud.feignCtr;

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 com.netflix.hystrix.HystrixCircuitBreaker;

import com.netflix.hystrix.HystrixCommandKey;

@RestController

public class FeignController {

    @Autowired

    private HelloClient helloClient;

    @RequestMapping(value = "tmHello", method = RequestMethod.GET)

    public String tmHello() {

        String result = helloClient.toHello();

        HystrixCircuitBreaker breaker = HystrixCircuitBreaker.Factory

                .getInstance(HystrixCommandKey.Factory

                        .asKey("HelloClient#toHello()"));

        System.out.println("断路器状态：" + breaker.isOpen());

        return result;

    }

}

1.4.4、服务调用者application.yml

server:

 port: 9000

spring:

 application:

  name: atm-eureka-hystrix-invoker

feign:

  hystrix:

    enabled: true

hystrix:

  command:

    ##全局方法使用default

    HelloClient#toHello():

      execution:

        isolation:

          thread:

          ##超时时间

            timeoutInMilliseconds: 500

      circuitBreaker:

      ##每秒3次请求

        requestVolumeThreshold: 3

eureka:

 client:

  serviceUrl:

   defaultZone: http://localhost:8761/eureka/

1.4.5、服务调用者HttpClientMain

package com.atm.cloud.feignCtr;

import org.apache.http.HttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.util.EntityUtils;

public class HttpClientMain {

    public static void main(String[] args) throws Exception{

        final CloseableHttpClient httpclient = HttpClients.createDefault();

        final String url = "http://localhost:9000/tmHello";

        for(int i = 0; i < 6; i++) {

            Thread t = new Thread() {

                @Override

                public void run() {

                    try {

                        HttpGet httpget = new HttpGet(url);

                        HttpResponse response = httpclient.execute(httpget);

                        System.out.println(EntityUtils.toString(response.getEntity()));

                    } catch (Exception e ) {

                        e.printStackTrace();

                    }

                }

            };

            t.start();

        }

        Thread.sleep(15000);

    }

}

1.5、Hystrix监控

客户端被监控
谁去监控客户端，一般由其他项目监控，这里新建一个maven项目进行监控

1.5.1、服务提供者引入依赖

<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-actuator</artifactId>

    <version>1.5.3.RELEASE</version>

</dependency>

1.5.2、监控引入依赖

<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/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.atm.cloud</groupId>

    <artifactId>atm_eureka_hystrix_visit</artifactId>

    <packaging>war</packaging>

    <version>0.0.1-SNAPSHOT</version>

    <name>atm_eureka_hystrix_visit Maven Webapp</name>

    <url>http://maven.apache.org</url>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>Dalston.SR1</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-hystrix</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

            <version>1.5.3.RELEASE</version>

        </dependency>

    </dependencies>

    <build>

        <finalName>atm_eureka_hystrix_visit</finalName>

    </build>

</project>

1.5.3、监控启动

监控服务调用者

package com.atm.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;

@SpringBootApplication

@EnableHystrixDashboard

public class HystrixVisitApp {

    public static void main(String[] args) {

        new SpringApplicationBuilder(HystrixVisitApp.class).properties(

                "server.port=8082").run(args);

    }

}

浏览器访问http://127.0.0.1:9000/hystrix.stream
浏览器访问http://127.0.0.1:9000/ivHello
浏览器访问http://127.0.0.1:8082/hystrix

执行HttpClientMain

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Feign Hystrix

1、Feign整合Hystrix

1.1、调用者引入依赖

1.2、启动类使用注解

1.3、新建Feign接口（测试回退）

1.3.1、回顾服务提供者MyRestController

1.3.2、回顾服务调用者HelloClient

1.3.3、回顾服务调用者FeignController

1.3.4、修改application.yml

1.3.5、新增HelloClientFallBack

1.3.6、修改HelloClient

1.4、测试断路器

1.4.1、服务提供者MyRestController

1.4.2、服务调用者HelloClient

1.4.3、服务调用者FeignController

1.4.4、服务调用者application.yml

1.4.5、服务调用者HttpClientMain

1.5、Hystrix监控

1.5.1、服务提供者引入依赖

1.5.2、监控引入依赖

1.5.3、监控启动

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