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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