[java]微服务架构连载No4 Hystrix+Dashboard+Turbine实现断路器(限流,超时,异常...)和服务监控

Hyxtrix:通过访问远程系统,服务,和第三方节点,从而对故障和延迟提供了强大的容错能力,具备了服务降级,服务熔断,远程隔离,请求缓存,请求合并已经服务监控等强大功能

本编文章架构图如下



新建6个工程

spring-cloud-03-hystrix-eureka (服务发现中心,同上篇文章)

spring-cloud-03-hystrix-client (服务发布)

spring-cloud-03-hystrix-request-a (服务请求集群a)

spring-cloud-03-hystrix-request-b (服务请求集群b)

spring-cloud-03-hystrix-dashboard (服务监控面板)

spring-cloud-03-hystrix-dashboard-turbine (集群服务监控)

spring-cloud-03-hystrix-client (服务发布)

@RestController
public class HelloController {

@GetMapping("/hello")
public String hello() throws InterruptedException {
System.err.println("---hello --");
Thread.sleep(4000l);
return "--- hello --";
}

@GetMapping("/dashboard")
public String dashboard() throws InterruptedException {
System.err.println("---dashboard --");
return "--- dashboard --";
}
}

spring:
  application:
    name: client-service

server:
  port: 7001
context-path: /

eureka:
  client:
    service-url:
     defaultZone: http://localhost:8001/eureka/

备注:  requestAPI hello配置睡眠4秒相应时间

  dashboard无配置

 端口 7001

spring-cloud-03-hystrix-request-a (服务请求集群a)


pom.xml导入hyxtrix和actuator包用作断路器

<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>

application.yml

spring:
  application:
    name: request-service

server:
  port: 7002
context-path: /

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8001/eureka/

#启动断路器
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 1000

custom:
   rest:
    connect-timeout: 1000
connection-request-timeout: 1000
read-timeout: 30000

备注: timeoutInMilliseconds 配置断路器超时时间1秒

custom.rest 配置服务超时时间

端口号 7002

@SpringBootApplication
@EnableDiscoveryClient
@EnableCircuitBreaker
public class RequestAApplication {

@Bean
    @ConfigurationProperties(prefix = "custom.rest")
public HttpComponentsClientHttpRequestFactory httpComponentsClientHttpRequestFactory(){
HttpComponentsClientHttpRequestFactory httpComponentsClientHttpRequestFactory=new HttpComponentsClientHttpRequestFactory();
return httpComponentsClientHttpRequestFactory;
}

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

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

备注: @EnableCircuitBreaker 开启断路器

HystrixService

@Service
public class HystrixService {

@Autowired
private RestTemplate restTemplate;

/**
* 超时降级策略
*
* @return
*/
@HystrixCommand(fallbackMethod = "helloFallback")
public String hello() {
return restTemplate.getForObject("http://client-service/hello", String.class);

}

public String helloFallback() {
return "------执行服务超时降级策略---";
}

/**
* 异常降级策略
*
* @return
*/
@HystrixCommand(fallbackMethod = "helloExceptionFallback", ignoreExceptions = {IOException.class})
public String helloException() {
throw new RuntimeException("helloException RuntimeException 异常了");

}

public String helloExceptionFallback(Throwable e) {
return "------执行服务异常降级策略---" + e.getMessage();
}

/**
* 高并发限流  之一: execution.isolation.strategy=THREAD线程隔离策略(它会独立在一个线程上执行,并且它的并发量受线程池中的数量限制)
*
*/
@HystrixCommand(
commandKey = "threadKey",
commandProperties = {
@HystrixProperty(name = "execution.isolation.strategy", value = "HTREAD"),
@HystrixProperty(name = "coreSize", value = "10"),
@HystrixProperty(name = "maxQueueSize", value = "50"),     //最大数
@HystrixProperty(name = "queueSizeRejectionThreshold", value = "30") // 拒绝阈值
},
fallbackMethod = "helloThreadFallback")
public String helloThread() {
return "------执行线程隔离策略 helloThread---";
}

public String helloExceptionFallback() {
return "------执行线程隔离策略 helloExceptionFallback---";
}

/**
* 高并发限流  之二: execution.isolation.strategy=SEMAPHORE 信号量策略(它则实现再调用的线程上,通过信号量的方式进行隔离,)
*/
@HystrixCommand(
commandKey = "semaphoreKey",
commandProperties = {
@HystrixProperty(name = "execution.isolation.strategy", value = "SEMAPHORE"),
@HystrixProperty(name = "executiion.isolation.strategy.maxConcurrentRequests", value = "50")
},
fallbackMethod = "helloSemaphoneFailback"
)
public String  helloSemaphone(){
return "------执行线程隔离策略 helloSemaphone---";
}

@HystrixCommand(fallbackMethod = "dashboardFallback")
public String dashboard() {
return restTemplate.getForObject("http://client-service/dashboard", String.class);

}

public String dashboardFallback() {
return "------执行服务dashboardFallback 超时降级策略---";
}
}

@RestController
public class HystrixController {

@Autowired
private HystrixService hystrixService;

@GetMapping(value = "/hello-hystrix")
public String hello(){
return hystrixService.hello();
}

@GetMapping(value = "/hello-exception")
public String helloException(){
return hystrixService.helloException();
}

@GetMapping(value = "/hello-dashboard")
public String dashboardException(){
return hystrixService.dashboard();
}
}

备注: 分别写了4个方法,分别是服务超时,服务异常,和高并发限流二种策略

spring-cloud-03-hystrix-request-b (服务请求集群b)

spring:
  application:
    name: request-service

server:
  port: 7003
context-path: /

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8001/eureka/

#启动断路器
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 1000

custom:
   rest:
    connect-timeout: 1000
connection-request-timeout: 1000
read-timeout: 30000

备注:端口号7003,其他同spring-cloud-03-hystrix-request-a

spring-cloud-03-hystrix-dashboard (服务监控面板)

pom.xml导入dashboard

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
</dependency>

application配置端口7004

spring:
  application:
    name: hystrix-dashboard

server:
  port: 7004
context-path: /

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8001/eureka/

@SpringBootApplication
@EnableDiscoveryClient
@EnableHystrixDashboard  //启动断路器监控
public class DashboardApplication {

// 监控台地址  http://192.168.0.102:7004/hystrix 
//查看什么样的数据[监控服务] http://192.168.0.102:7002/hystrix.stream 并输入到监控台

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

备注: @EnableHystrixDashboard 启动断路器监控

spring-cloud-03-hystrix-dashboard-turbine (集群服务监控)

pom.xml导入turbine

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

spring:
  application:
    name: hystrix-turbine

server:
  port: 7005
context-path: /

management:
prot:3001

turbine:
  app-config: request-service    #要监控的服务
cluster-name-expression: "'default'"
combine-host-port: true

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8001/eureka/

备注: app-config 配置要监控的服务,spring-cloud-03-hystrix-request-a 和b

cluster-name-expression写默认值

@SpringBootApplication
@EnableDiscoveryClient
@EnableTurbine  //启动收集集群断路器
public class TruebineApplication {

//监控台地址  http://192.168.0.102:7004/hystrix 
//查看什么样的数据[监控服务] http://192.168.0.102:7002/hystrix.stream 并输入到监控台

//要监控的turbine地址[监控的hystrix-reuqest服务] http://localhost:7005/trubine.stream,输入到dashboard 
public static void main(String[] args) {
SpringApplication.run(TruebineApplication.class, args);
}
}

备注:@EnableTurbine  开启集群服务监控

使用:

1:访问http://192.168.0.102:7003/hello-hystrix ,由于服务睡眠4秒,而配置的服务超时时间custom.rest.read-timeout =3000 ,那么服务会超时,断路器通过fallbackMethod = "helloFallback" 最终执行 helloFallback方法,并返回  "------执行服务超时降级策略---" ,异常同理

2:访问 http://192.168.0.102:7005/turbine.stream 获取服务数据流

3:访问面板路径 http://localhost:7005/trubine.stream 数据要监控的服务地址 http://192.168.0.102:7005/turbine.stream

4:监控面板获取实时监控数据

截图一



截图二



截图三



截图四