SpringCloud-Hystrix Health Indicator及Metrics Stream

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

	4.0.0

	microservice-consumer-movie-ribbon-with-hystrix-propagation
	jar

	
		com.itmuch.cloud
		microservice-spring-cloud
		0.0.1-SNAPSHOT
	

	
		UTF-8
		UTF-8
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter-web
		

		
			org.springframework.cloud
			spring-cloud-starter-eureka
		

		
			org.springframework.boot
			spring-boot-starter-actuator
		
		
		
			org.springframework.cloud
			spring-cloud-starter-hystrix
		
	

说明：

    1）在需要支持Hystrix Health Indicator及Metrics Stream的时候需要加上依赖

       
           org.springframework.boot
           spring-boot-starter-actuator
        

application.yml

spring:
  application:
    name: microservice-consumer-movie-ribbon
server:
  port: 8010
eureka:
  client:
    healthcheck:
      enabled: true
    serviceUrl:
#      defaultZone: http://localhost:8761/eureka
      defaultZone: http://user:password123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000

User

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 {
  @Autowired
  private 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
  @LoadBalanced
  public 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。

http://localhost:8010/hystrix.stream

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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