目的：

　　Hystrix集群及监控turbine

　　Feign、Hystrix整合之服务熔断服务降级彻底解耦

　　集群后超时设置

Hystrix集群及监控turbine

　新建一个springboot工程microservice-student-provider-hystrix-1005把它作为集群

工程中测试详细代码见https://www.cnblogs.com/huangting/p/11902121.html

导入pom依赖

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>com.ht</groupId>

        <artifactId>htSpringCloud</artifactId>

        <version>1.0-SNAPSHOT</version>

    </parent>

    <artifactId>microservice-student-provider-hystrix-1005</artifactId>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <!--添加注册中心Eureka相关配置-->

        <dependency>

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

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

        </dependency>

        <dependency>

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

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

        </dependency>

        <!-- actuator监控引入 -->

        <dependency>

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

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

        <dependency>

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

            <artifactId>spring-boot-starter-data-jpa</artifactId>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

        </dependency>

        <dependency>

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

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

        </dependency>

        <dependency>

            <groupId>com.alibaba</groupId>

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

        </dependency>

        <!--  修改后立即生效，热部署  -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>springloaded</artifactId>

        </dependency>

        <dependency>

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

            <artifactId>spring-boot-devtools</artifactId>

        </dependency>

        <dependency>

            <groupId>com.ht</groupId>

            <artifactId>microservice-common</artifactId>

            <version>1.0-SNAPSHOT</version>

            <scope>compile</scope>

        </dependency>

        <!--Hystrix相关依赖-->

        <dependency>

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

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

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

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

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

修改yml配置：

---

server:

  port: 1004

  context-path: /

spring:

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.jdbc.Driver

    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8

    username: root

    password: root

  jpa:

    hibernate:

      ddl-auto: update

    show-sql: true

  application:

    name: microservice-student

  profiles: provider-hystrix-1004

eureka:

  instance:

    hostname: localhost

    appname: microservice-student

    instance-id: microservice-student:1004

    prefer-ip-address: true

  client:

    service-url:

      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

info:

  groupId: com.ht.testSpringcloud

  artifactId: microservice-student-provider-hystrix-1004

  version: 1.0-SNAPSHOT

  userName: http://ht.com

  phone: 123456

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

---

server:

  port: 1005

  context-path: /

spring:

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.jdbc.Driver

    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8

    username: root

    password: root

  jpa:

    hibernate:

      ddl-auto: update

    show-sql: true

  application:

    name: microservice-student

  profiles: provider-hystrix-1005

eureka:

  instance:

    hostname: localhost

    appname: microservice-student

    instance-id: microservice-student:1005

    prefer-ip-address: true

  client:

    service-url:

      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

info:

  groupId: com.ht.htSpringCloud

  artifactId: microservice-student-provider-hystrix-1005

  version: 1.0-SNAPSHOT

  userName: http://ht.com

  phone: 123456

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

---

server:

  port: 1006

  context-path: /

spring:

  datasource:

    type: com.alibaba.druid.pool.DruidDataSource

    driver-class-name: com.mysql.jdbc.Driver

    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8

    username: root

    password: root

  jpa:

    hibernate:

      ddl-auto: update

    show-sql: true

  application:

    name: microservice-student

  profiles: provider-hystrix-1006

eureka:

  instance:

    hostname: localhost

    appname: microservice-student

    instance-id: microservice-student:1006

    prefer-ip-address: true

  client:

    service-url:

      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

info:

  groupId: com.ht.htSpringCloud

  artifactId: microservice-student-provider-hystrix-1006

  version: 1.0-SNAPSHOT

  userName: http://ht.com

  phone: 123456

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

启动类MicroserviceStudentProviderHystrix1005Application 中添加注释

package com.ht.microservicestudentproviderhystrix1005;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.domain.EntityScan;

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

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

@EnableCircuitBreaker

@EntityScan("com.ht.*.*")

@EnableEurekaClient

@SpringBootApplication

public class MicroserviceStudentProviderHystrix1005Application {

    public static void main(String[] args) {

        SpringApplication.run(MicroserviceStudentProviderHystrix1005Application.class, args);

    }

}

然后配置启动项的时候多搞几个启动项，这里搞了三个

provider-hystrix-1004
provider-hystrix-1005
provider-hystrix-1006

好了一个hystrix集群服务就搭好了。

修改pom依赖：

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>com.ht</groupId>

        <artifactId>htSpringCloud</artifactId>

        <version>1.0-SNAPSHOT</version>

    </parent>

    <artifactId>microservice-student-consumer-hystrix-turbine-91</artifactId>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

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

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

        </dependency>

        <dependency>

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

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

            <scope>test</scope>

            <exclusions>

                <exclusion>

                    <groupId>org.junit.vintage</groupId>

                    <artifactId>junit-vintage-engine</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

        <dependency>

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

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

        </dependency>

        <dependency>

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

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

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

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

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

配置yml文件

server:

  port: 91

  context-path: /

eureka:

  client:

    service-url:

      defaultZone: http://eureka2001.ht.com:2001/eureka/,http://eureka2002.ht.com:2002/eureka/,http://eureka2003.ht.com:2003/eureka/

turbine:

  app-config: microservice-student   # 指定要监控的应用名称

  clusterNameExpression: "'default'" #表示集群的名字为default

spring:

  application:

    name: turbine

给启动类MicroserviceStudentConsumerHystrixTurbine91Application 加注解：@EnableTurbine

package com.ht.microservicestudentconsumerhystrixdashboard90;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;

import org.springframework.cloud.netflix.turbine.EnableTurbine;

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})

@EnableTurbine

public class MicroserviceStudentConsumerHystrixDashboard90Application {

    public static void main(String[] args) {

        SpringApplication.run(MicroserviceStudentConsumerHystrixDashboard90Application.class, args);

    }

}

测试：
先启动三个eureka，然后把1004 1005 带hystrix的服务都启动；
microservice-student-consumer-80这个也启动，方便测试；
dashboard，turbine启动；

这样的话 http://localhost/student/hystrix 就能调用服务集群；
http://localhost:91/turbine.stream 可以监控数据，实时ping 返回data

输入http://localhost:90/hystrix进入仪表盘，输入地址，进行实时监控测试

Feign、Hystrix整合之服务熔断服务降级彻底解耦

前面的代码，用@HystrixCommand fallbackMethod是很不好的，因为和业务代码耦合度太高，不利于维护，所以需要解耦，这我们讲下Feign Hystrix整合。

microservice-student-provider-hystrix项目修改
我们不用原先那套。按照正常的逻辑来写；
StudentService加新的接口方法：

/**

 * 测试Hystrix服务降级

 * @return

 */

public Map<String,Object> hystrix();

StudentServiceImpl实现：

@Override

public Map<String, Object> hystrix() {

    Map<String,Object> map=new HashMap<String,Object>();

    map.put("code", 200);

    map.put("info","工号【"+port+"】正在为您服务");

    return map;

}

StudentProviderController正常调用service方法：

/**

     * 测试Hystrix服务降级

     * @return

     * @throws InterruptedException

     */

    @ResponseBody

    @GetMapping(value="/hystrix")

    @HystrixCommand(fallbackMethod="hystrixFallback")

    public Map<String,Object> hystrix() throws InterruptedException{

        Thread.sleep(2000);

//        Map<String,Object> map=new HashMap<String,Object>();

//        map.put("code", 200);

//        map.put("info","工号【"+port+"】正在为您服务");

        return studentService.hystrix();

    }

microservice-common项目新建FallbackFactory类，解耦服务熔断服务降级

StudentClientService接口，新增getInfo方法；

/**

 * 服务熔断降级

 * @return

 */

@GetMapping(value="/student/hystrix")

public Map<String,Object> hystrix();

microservice-common的application.yml加上hystrix支持
hystrix支持

feign:

  hystrix:

    enabled: true

新建 StudentClientFallbackFactory 类，实现FallbackFactory接口；

package com.ht.microservicestudentproviderhystrix.service;

import com.ht.microservicecommon.StudentClientService;

import com.ht.microservicecommon.entity.Student;

import feign.hystrix.FallbackFactory;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class StudentClientFallbackFactory implements FallbackFactory<StudentClientService> {

    @Override

    public StudentClientService create(Throwable cause) {

        return new StudentClientService() {

            @Override

            public boolean save(Student student) {

                return false;

            }

            @Override

            public List<Student> list() {

                return null;

            }

            @Override

            public Map<String, Object> hystrix() {

                Map<String,Object> map=new HashMap<String,Object>();

                map.put("code", 500);

                map.put("info", "系统繁忙，稍后重试");

                return map;

            }

            @Override

            public Student get(Integer id) {

                return null;

            }

            @Override

            public boolean delete(Integer id) {

                return false;

            }

            @Override

            public String ribbon() {

                return null;

            }

        };

    }

}

StudentClientService接口的@FeignClient注解加下 fallbackFactory属性

@FeignClient(value="MICROSERVICE-STUDENT",fallbackFactory=StudentClientFallbackFactory.class)

microservice-student-consumer-feign-80修改 支持Hystrix
StudentConsumerFeignController新增方法调用

/**

 * Feign整合Hystrix服务熔断降级

 * @return

 * @throws InterruptedException

 */

@GetMapping(value="/hystrix")

public Map<String,Object> hystrix() throws InterruptedException{

    return studentClientService.hystrix();

}
microservice-student-consumer-feign-80启动类中添加注释
package com.ht.microservicestudentconsumerfeign80;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;

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

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

import org.springframework.context.annotation.ComponentScan;

@EnableEurekaClient

@EnableFeignClients(value = "com.ht.*.*")

@ComponentScan(basePackages = {"com.ht.microservicecommon.service", "com.ht.microservicestudentconsumerfeign80"})

@SpringBootApplication(exclude={DataSourceAutoConfiguration.class, HibernateJpaAutoConfiguration.class})

public class MicroserviceStudentConsumerFeign80Application {

    public static void main(String[] args) {

        SpringApplication.run(MicroserviceStudentConsumerFeign80Application.class, args);

    }

}

集群后超时设置

microservice-common的application.yml加上hystrix支持

这里因为还有一个 feign 也有一个超时时间的设置，当然feign底层是 ribbon的封装，所以 直接配置ribbon，ribbon默认超时也是1秒。

所以这里都是强制要求，ribbon的超时时间要大于hystrix的超时时间，否则 hystrix自定义的超时时间毫无意义。

所以还得microservice-student-consumer-feign-80上加个 ribbon超时时间设置

hystrix:

  command:

    default:

      execution:

        isolation:

          thread:

            timeoutInMilliseconds: 1500

这里因为还有一个 feign 也有一个超时时间的设置，当然feign底层是 ribbon的封装，所以 直接配置ribbon，ribbon默认超时也是1秒。
所以这里都是强制要求，ribbon的超时时间要大于hystrix的超时时间，否则 hystrix自定义的超时时间毫无意义。
所以还得microservice-student-consumer-feign-80上加个 ribbon超时时间设置

ribbon:

  ReadTimeout: 10000

  ConnectTimeout: 9000

谢谢观看！

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