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通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

本文介紹通過JMX注解,實作自定義MBean的管理,并顯示在Spring Boot Admin UI界面上。同時,通過Redis作為存儲媒介,将兩個服務中Tomcat的參數maxPostSize及maxThreads的和顯示在Spring Boot Admin UI的界面上。

目錄

    • 目錄
    • 服務布局
    • eureka-server
      • pomxml
      • applicationyml
      • 啟動類EurekaServerApplicationjava添加注解
    • admin-server
      • pomxml
      • applicationyml
      • 啟動類AdminServerApplicationjava注解
    • jmx-client
      • pomxml
      • applicationyml
      • 啟動類JmxClientApplication注解
      • MBean類
      • 配置類
    • jmx-client-2
    • 在admin-server中添加求和類
      • sumjava
      • 配置類
    • 啟動四個服務
    • 總結

服務布局

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

如圖所示,本次執行個體共有四個服務:eureka-server(端口8761)、admin-server(端口8090)、jmx-client(端口8081)以及jmx-client-2(端口8082)。其中,admin-server(端口8090)、jmx-client(端口8081)以及jmx-client-2(端口8082)均注冊于注冊中心eureka-server(端口8761)。admin-server(端口8090)通過注冊中心eureka-server(端口8761)獲得jmx-client(端口8081)以及jmx-client-2(端口8082)服務中的相關資訊。

PS:所有服務都是通過線上生成,如圖

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

eureka-server

pom.xml

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

eureka-server要引入spring-cloud-starter-eureka-server依賴包。

application.yml

spring:
  application:
    name: Eureka-Server
    index: 
server:
  port: 

eureka:
  server:
    enable-self-preservation: false #關閉自我保護
    eviction-interval-timer-in-ms:  #清理間隔(機關毫秒)
  instance:
    hostname: eureka-server
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
management:
  security:
    enabled: false
           

啟動類EurekaServerApplication.java添加注解

@SpringBootApplication
@EnableEurekaServer
           

到此,注冊中心就完成配置。

admin-server

pom.xml

<dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-server</artifactId>
            <version>1.5.4</version>
        </dependency>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-server-ui</artifactId>
            <version>1.5.4</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.2.6.RELEASE</version>
        </dependency>
        <!--jmx依賴包-->
        <dependency>
            <groupId>org.jolokia</groupId>
            <artifactId>jolokia-core</artifactId>
        </dependency>
        <!--redis-->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
           

application.yml

info:
  version: @project.version@
server:
  port: 

spring:
  application:
    name: Admin-Server
    index: 
  boot:
    admin:
      url: http://localhost:${server.port}
  redis:
      host: localhost
      port: 
      password:
      pool:
        max-active: 
        max-wait: 
endpoints:
  health:
    sensitive: false
# 向注冊中心注冊服務
eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.application.index}:${random.value}
    prefer-ip-address: true
    hostname: admin-sever-${spring.application.index}
    status-page-url-path: ${management.context-path}/info
    health-check-url-path: ${management.context-path}/health
    metadata-map:
      management:
        context-path: ${management.context-path}
  client:
    service-url:
      defaultZone: http://localhost:/eureka/
management:
  security:
    enabled: false
  context-path: /manage
           

啟動類AdminServerApplication.java注解

@SpringBootApplication
@EnableAdminServer
@EnableDiscoveryClient
           

至此,admin-server配置暫時完成。

jmx-client

pom.xml

<!--jmx依賴-->
        <dependency>
            <groupId>org.jolokia</groupId>
            <artifactId>jolokia-core</artifactId>
        </dependency>
        <!--Redis依賴-->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
        </dependency>
           

application.yml

info:
  version: @project.version@

spring:
  application:
    name: JMX-Client
    index: 
  boot:
    admin:
      url: http://localhost:
  redis:
    host: localhost
    port: 
    password:
    pool:
      max-active: 
      max-wait: 
server:
  port: 
# 注冊到注冊中心
eureka:
  instance:
    instance-id: ${spring.application.name}:${spring.application.index}:${random.value}
    prefer-ip-address: true
    hostname: jmx-client-${spring.application.index}
    status-page-url-path: ${management.context-path}/info
    health-check-url-path: ${management.context-path}/health
    metadata-map:
      management:
        context-path: ${management.context-path}
  client:
    service-url:
      defaultZone: http://localhost:/eureka/
management:
  security:
    enabled: false
  context-path: /manage
           

可以發現,jmx-client子產品并沒有直接注冊到admin-server服務中,而是直接注冊到eureka-server服務中。同時,admin-server也注冊在eureka-server中,admin-server就能夠通過注冊中心獲得jmx-client的相關資訊。

啟動類JmxClientApplication注解

@SpringBootApplication
@EnableEurekaClient
           

MBean類

@ManagedResource(objectName = "bean:name=MyBean", description = "My Managed Bean", log = true, logFile = "jmx.log",
    currencyTimeLimit = , persistPolicy = "OnUpdate", persistPeriod = , persistLocation = "foo",
    persistName = "bar")
public class MyBean {
    private ApplicationContext applicationContext;

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    private ValueOperations<String, String> valueOperations;

    public MyBean(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }

    @PostConstruct
    private void init(){
        this.valueOperations = stringRedisTemplate.opsForValue();
    }

    private Connector getConnector(){
        EmbeddedServletContainer embeddedServletContainer =
            ((EmbeddedWebApplicationContext) applicationContext).getEmbeddedServletContainer();
        Tomcat tomcat = ((TomcatEmbeddedServletContainer) embeddedServletContainer).getTomcat();
        return tomcat.getConnector();
    }

    @ManagedAttribute(description = "獲得最小備用線程數,tomcat啟動時的初始化的線程數")
    public int getMaxPostSize() {
        int maxPostSize = (int) IntrospectionUtils.getProperty(getConnector(), "maxPostSize");
        valueOperations.set("maxPostSize", String.valueOf(maxPostSize));
        return maxPostSize;
    }

    @ManagedAttribute(description = "設定最小備用線程數,tomcat啟動時的初始化的線程數")
    public void setMaxPostSize(int value){
        valueOperations.set("maxPostSize", String.valueOf(value));
        IntrospectionUtils.setProperty(getConnector(), "maxPostSize", String.valueOf(value));
    }

    @ManagedAttribute(description = "獲得tomcat起動的最大線程數,即同時處理的任務個數")
    public int getMaxThreads(){
        int maxThreads = (int) IntrospectionUtils.getProperty(getConnector(), "maxThreads");
        valueOperations.set("maxThreads", String.valueOf(maxThreads));
        return maxThreads;
    }

    @ManagedAttribute(description = "設定tomcat起動的最大線程數,即同時處理的任務個數")
    public void setMaxThreads(int value){
        valueOperations.set("maxThreads", String.valueOf(value));
        IntrospectionUtils.setProperty(getConnector(), "maxThreads", String.valueOf(value));
    }
           

其中,getXXX是獲得相應的屬性,setXXX是具有修改屬性值的權限。

配置類

public class BeanConfig {

    @Bean
    public MyBean myBean(ApplicationContext applicationContext){
        return new MyBean(applicationContext);
    }

}
           

至此,jmx-client配置已經完成。

jmx-client-2

複制一份jmx-client ,并更改**application.yml**server端口号為8082

server:
  port: 
           

更改自定義MBean存儲在Redis中的key值,以避免與jmx-client存儲的key值重複,即

@ManagedAttribute(description = "獲得最小備用線程數,tomcat啟動時的初始化的線程數")
    public int getMaxPostSize() {
        int maxPostSize = (int) IntrospectionUtils.getProperty(getConnector(), "maxPostSize");
        valueOperations.set("maxPostSize2", String.valueOf(maxPostSize));
        return maxPostSize;
    }

    @ManagedAttribute(description = "設定最小備用線程數,tomcat啟動時的初始化的線程數")
    public void setMaxPostSize(int value){
        valueOperations.set("maxPostSize2", String.valueOf(value));
        IntrospectionUtils.setProperty(getConnector(), "maxPostSize", String.valueOf(value));
    }

    @ManagedAttribute(description = "獲得tomcat起動的最大線程數,即同時處理的任務個數")
    public int getMaxThreads(){
        int maxThreads = (int) IntrospectionUtils.getProperty(getConnector(), "maxThreads");
        valueOperations.set("maxThreads2", String.valueOf(maxThreads));
        return maxThreads;
    }

    @ManagedAttribute(description = "設定tomcat起動的最大線程數,即同時處理的任務個數")
    public void setMaxThreads(int value){
        valueOperations.set("maxThreads2", String.valueOf(value));
        IntrospectionUtils.setProperty(getConnector(), "maxThreads", String.valueOf(value));
    }
           

在admin-server中添加求和類

sum.java

@ManagedResource(objectName = "bean:name=sumBean",description = "兩個服務參數的和")
public class SumBean {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    private ValueOperations<String, String> valueOperations;

    @PostConstruct
    private void init() {
        this.valueOperations = stringRedisTemplate.opsForValue();
    }

    @ManagedAttribute(description = "兩個服務maxPostSize的和")
    public int getSumMaxPostSize() {
        // 取出jmx-client儲存的maxPostSize值
        int maxPostSize = Integer.parseInt(valueOperations.get("maxPostSize"));
        // 取出jmx-client-2儲存的maxPostSize2值
        int maxPostSize2 = Integer.parseInt(valueOperations.get("maxPostSize2"));
        return maxPostSize + maxPostSize2;
    }
    @ManagedAttribute(description = "兩個服務maxThreads的和")
    public int getSumMaxThreads(){
        // 取出jmx-client儲存的maxThreads值
        int maxThreads = Integer.parseInt(valueOperations.get("maxThreads"));
        // 取出jmx-client-2儲存的maxThreads2值
        int maxThreads2 = Integer.parseInt(valueOperations.get("maxThreads2"));
        return maxThreads + maxThreads2;
    }
}
           

配置類

@Configuration
public class BeanConfig {

    @Bean
    public SumBean sumBean(){
        return new SumBean();
    }
}
           

啟動四個服務

如圖

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

PS:idea 2.6+版本可以同時啟動多個服務,而不需要挨個去找application類了。

Eureka注冊中心

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

Admin Server

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

點選JMX-CLIENT後 【Details】連結,然後再點開【JMX】連結,就可以看到自定義的bean

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

更改【write】後面的數值,點選【reload】,就能看到更改後的數值:

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

對于jmx-client-2也有同樣的效果。在Admin Server UI界面點選ADMIN SERVER後的【Details】連結,進入【JMX】連結,看到自定義的MBean類,檢視求和值為jmx-client和jmx-client-2各參數的加和:

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

将jmx-client MaxThreads值改回200後,【reload】界面,傳回求和界面,可以看到MaxThreads值已經變為400:

通過JMX和Redis在Spring Boot Admin界面顯示多個服務某些參數的和

總結

通過本執行個體可以初步了解如何聯合JMX、Redis、Spring Boot Admin以及Eureka實作多個服務某些參數值的監控。源碼在https://github.com/GitBaymin/spring-jmx

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