Eureka客户端健康检查

一加入Actuator

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>

查看/health端点

二新建my-health-provider

1 新建依赖

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>1.5.4.RELEASE</version>
        </dependency>
    </dependencies>

2 新建配置

spring:
  application:
    name: my-health-provider
endpoints:
  sensitive: false
eureka:
  client:
    instanceInfoReplicationIntervalSeconds: 10
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

3 新建控制类

package org.crazyit.cloud;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PoliceController {

    @RequestMapping(value = "/call/{id}", method = RequestMethod.GET,
            produces = MediaType.APPLICATION_JSON_VALUE)
    public Police call(@PathVariable Integer id) {
        Police p = new Police();
        p.setId(id);
        p.setName("angus");
        return p;
    }
    
    // 能否访问数据库的标识
    public static boolean canVisitDb = true;
    
    @RequestMapping(value = "/db/{can}", method = RequestMethod.GET)
    public void setDb(@PathVariable boolean can) {
        canVisitDb = can;
    }
}

4 新建健康指示器

package org.crazyit.cloud;

import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.boot.actuate.health.Status;
import org.springframework.stereotype.Component;

@Component
public class MyHealthIndicator implements HealthIndicator {

    public Health health() {
        if(PoliceController.canVisitDb) {
            return new Health.Builder(Status.UP).build();
        } else {
            return new Health.Builder(Status.DOWN).build();
        }
    }

}

5 测试

先访问 http://localhost:8080/db/false

再访问 http://localhost:8080/health

结果为：

{"status":"DOWN"}

6 新建健康检查处理器，实现传播状态到服务器

package org.crazyit.cloud;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.health.Status;
import org.springframework.stereotype.Component;

import com.netflix.appinfo.HealthCheckHandler;
import com.netflix.appinfo.InstanceInfo.InstanceStatus;

@Component
public class MyHealthCheckHandler implements HealthCheckHandler {

    @Autowired
    private MyHealthIndicator halthIndicator;
    
    public InstanceStatus getStatus(InstanceStatus currentStatus) {
        Status status = halthIndicator.health().getStatus();
        if(status.equals(Status.UP)) {
            return InstanceStatus.UP;
        } else {
            return InstanceStatus.DOWN;
        }
    }

}

7 测试Eureka的页面

先访问 http://localhost:8080/db/false

Eureka客户端健康检查

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