本文主要是介绍SpringCloud-Hystrix Health Indicator及Metrics Stream，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
概述
Hystrix Health Indicator及Metrics Stream
Hystrix健康检查及度量流
创建工程
pom.xml
microservice-consumer-movie-ribbon-with-hystrix-propagation/pom.xml
<?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><artifactId>microservice-consumer-movie-ribbon-with-hystrix-propagation</artifactId><packaging>jar</packaging><parent><groupId>com.itmuch.cloud</groupId><artifactId>microservice-spring-cloud</artifactId><version>0.0.1-SNAPSHOT</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</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-actuator</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix</artifactId></dependency></dependencies>
</project>
说明：
1）在需要支持Hystrix Health Indicator及Metrics Stream的时候需要加上依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
application.yml
spring:application:name: microservice-consumer-movie-ribbon
server:port: 8010
eureka:client:healthcheck:enabled: trueserviceUrl:
# defaultZone: http://localhost:8761/eurekadefaultZone: http://user:password123@localhost:8761/eurekainstance:prefer-ip-address: true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000User
com.itmuch.cloud.entity.User
package com.itmuch.cloud.entity;import java.math.BigDecimal;public class User {private Long id;private String username;private String name;private Short age;private BigDecimal balance;public Long getId() {return this.id;}public void setId(Long id) {this.id = id;}public String getUsername() {return this.username;}public void setUsername(String username) {this.username = username;}public String getName() {return this.name;}public void setName(String name) {this.name = name;}public Short getAge() {return this.age;}public void setAge(Short age) {this.age = age;}public BigDecimal getBalance() {return this.balance;}public void setBalance(BigDecimal balance) {this.balance = balance;}}
MovieController
com.itmuch.cloud.controller.MovieController
package com.itmuch.cloud.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;import com.itmuch.cloud.entity.User;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;@RestController
public class MovieController {@Autowiredprivate RestTemplate restTemplate;@GetMapping("/movie/{id}")@HystrixCommand(fallbackMethod = "findByIdFallback", commandProperties = @HystrixProperty(name = "execution.isolation.strategy", value = "SEMAPHORE"))public User findById(@PathVariable Long id) {return this.restTemplate.getForObject("http://microservice-provider-user/simple/" + id, User.class);}public User findByIdFallback(Long id) {User user = new User();user.setId(0L);return user;}
}
ConsumerMovieRibbonApplication
com.itmuch.cloud.ConsumerMovieRibbonApplication
package com.itmuch.cloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker
public class ConsumerMovieRibbonApplication {@Bean@LoadBalancedpublic RestTemplate restTemplate() {return new RestTemplate();}public static void main(String[] args) {SpringApplication.run(ConsumerMovieRibbonApplication.class, args);}
}
测试
Hystrix Health Indicato（Hystrix监控指标）
服务正常的效果
http://localhost:8010/health
服务失效的效果
http://localhost:8010/health
说明：
1）多次快速访问http://localhost:8010/movie/1，就会出现这个场景；
Metrics Stream支持
Metrics Stream是做监控用的；
使用Hystrix metrics stream需要引入依赖 spring-boot-starter-actuator。这会暴露/hystrix.stream作为一个管理端点。
说明：
1）访问http://localhost:8010/hystrix.stream；
2）会看到有数据不停的输出；
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