断路器监控Hystrix Dashboard的使用

一、Hystrix Dashboard

作用：

实时监控各个Hystrix commandKey的各种指标值
通过 Dashboards 的实时监控来动态修改各种配置

仪表盘：

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二、启动Hystrix Dashboard

1、下载 standalone-hystrix-dashboard-1.5.3-all.jar

下载地址：https://search.maven.org/search ，选框中输入 standalone-hystrix-dashboard 查询，然后下载。

2、启动Hystrix Dashboard

java -jar -DserverPort=7979 -DbindAddress=localhost standalone-hystrix-dashboard-1.5.3-all.jar

注意：其中的serverPort、bindAddress是可选参数，若不添加，默认是7979和localhost

3、检测是否启动成功

浏览器输入http://localhost:7979/hystrix-dashboard/，出现小熊页面就是正确了。

三、代码

1、pom.xml

        <!-- https://mvnrepository.com/artifact/com.netflix.hystrix/hystrix-core -->
        <dependency>
            <groupId>com.netflix.hystrix</groupId>
            <artifactId>hystrix-core</artifactId>
            <version>${
    
    hystrix-version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.netflix.hystrix/hystrix-javanica -->
        <dependency>
            <groupId>com.netflix.hystrix</groupId>
            <artifactId>hystrix-javanica</artifactId>
            <version>${
    
    hystrix-version}</version>
        </dependency>
        <!-- http://mvnrepository.com/artifact/com.netflix.hystrix/hystrix-metrics-event-stream -->
        <dependency>
            <groupId>com.netflix.hystrix</groupId>
            <artifactId>hystrix-metrics-event-stream</artifactId>
            <version>${
    
    hystrix-version}</version>
        </dependency>

说明：

hystrix-core：hystrix核心接口包。
hystrix-metrics-event-stream：只要客户端连接还连着，hystrix-metrics-event-stream就会不断的向客户端以 text/event-stream 的形式推送计数结果。

2、HystrixConfig.java

import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import com.netflix.hystrix.contrib.javanica.aop.aspectj.HystrixCommandAspect;
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class HystrixConfig {
    
    

    @Bean
    @HystrixProperty(name = "circuitBreaker.enabled", value = "true")
    public HystrixCommandAspect hystrixCommandAspect() {
    
    
        return new HystrixCommandAspect();
    }

    /**
     * Send stream message to Hystrix-dashboard
     */
    @Bean
    public ServletRegistrationBean hystrixMetricsStreamServlet() {
    
    
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new HystrixMetricsStreamServlet());
        registrationBean.addUrlMappings("/hystrix.stream");
        return registrationBean;
    }
}

3、Controller代码

参考github源码：https://github.com/fomeiherz/spring-boot-hystrix-example

4、测试
浏览器访问 http://localhost:7979/hystrix-dashboard/ ，在控制台输入spring-boot 应用的监控的地址。
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说明： 启动服务后，输入 http://localhost:8080/hystrix.stream ，之后点击“Add Stream”，最后点击“Monitor Stream”即可。

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