spring cloud(五) hystrix

开启feign 熔断 hystrix    整合hystrix-dashboard监控面板

1. 服务调用者boot工程 pom引入依赖

<!-- hystrix-dashboard 监控依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

　　

2. 启动类开启熔断注解 @EnableCircuitBreaker  面板监控注解 @EnableHystrixDashboard  添加面板servlet

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
@EnableCircuitBreaker
@EnableHystrixDashboard
public class WebWapApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebWapApplication.class, args);
    }

    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }

    @Bean
    public ServletRegistrationBean getServlet(){
        HystrixMetricsStreamServlet streamServlet=new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean=new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/actuator/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }

}

　　

3.修改配置文件  开启feign熔断  设置超时时间

feign.hystrix.enabled=true
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=20000

　　

4.浏览器查看面板监控   http://localhost:8080/hystrix

点击Monitor Stream   可查看请求成功次数   超时次数  等等

整合多个服务  分布式监控   使用 Turbine

1.新建boot工程  引入依赖

 <!-- eureka客户端  -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <!-- hystrix 监控面板  -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-netflix-turbine</artifactId>
        </dependency>

2.启动类添加注解

　　

@SpringBootApplication
@EnableEurekaClient
@EnableHystrixDashboard
@EnableTurbine
public class HystrixDashboardApplication {

    public static void main(String[] args) {
        SpringApplication.run(HystrixDashboardApplication.class, args);
    }
    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }

    @Bean
    public ServletRegistrationBean getServlet(){
        HystrixMetricsStreamServlet streamServlet=new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean=new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

　　

3. 配置文件

server.port=9004
spring.application.name=hystrix-dashboard
#eureka
eureka.client.service-url.defaultZone=http://localhost:9001/eureka/
eureka.instance.prefer-ip-address=true
eureka.instance.instance-id=${spring.cloud.client.ip-address}:${server.port}

management.endpoints.web.exposure.include=hystrix.stream,health,info

#要监控的服务name
turbine.app-config=web-wap

turbine.cluster-name-expression=new String("default")
management.endpoint.health.show-details=always
management.health.redis.enabled=false

　　

4.启动 查看面板