一、目的

1. 服务发生线程锁住，需要下线服务时，保证请求中的接口不受影响，执行完后，再下线服务

二、步骤

*kill -15时执行改钩子函数 优雅停机

1.当线程锁住

2.运维那边监控到，然后进行kill -15 进程ID

3.代码这边监听到关闭信号，先把容器权重设置为0，不允许新的请求进来.

4.然后为了保住容器其他请求中的接口不受影响，进行睡眠30s再关闭容器

三、代码实现

package com.dst.XXX.XXX;import com.alibaba.cloud.nacos.NacosDiscoveryProperties;
import com.alibaba.nacos.api.NacosFactory;
import com.alibaba.nacos.api.PropertyKeyConst;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.naming.NamingService;
import com.alibaba.nacos.api.naming.pojo.Instance;
import com.dst.steed.common.util.DstSpringUtil;
import com.dst.steed.rabbit.annotation.SteedAmqpScan;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.util.StopWatch;import javax.annotation.Resource;
import java.text.DecimalFormat;
import java.util.List;
import java.util.Optional;
import java.util.Properties;import static com.dst.lcb.base.DstSteedLcbBaseService.PACKAGE_NAME;/*** 服务启动** @author LWP* @since 2024/08/20*/
@Slf4j
@SpringBootApplication(scanBasePackages = {PACKAGE_NAME})
@EnableFeignClients(basePackages = PACKAGE_NAME + ".infrastructure.acl")
@MapperScan(basePackages = {PACKAGE_NAME + ".infrastructure.biz.**.mapper", PACKAGE_NAME + ".modules.mapper","generator.mapper"})
@SteedAmqpScan(basePackage = PACKAGE_NAME + ".infrastructure.mq")
public class DstSteedXXXXService implements CommandLineRunner, ApplicationContextAware {public static final String PACKAGE_NAME = "com.dst.XXX.XXX";@Autowiredprivate ConfigurableApplicationContext applicationContext;@Resourceprivate NacosDiscoveryProperties nacosDiscoveryProperties;public static void main(String[] args) {StopWatch stopWatch = new StopWatch();stopWatch.start();SpringApplication.run(DstSteedLcbBaseService.class, args);stopWatch.stop();log.info("【服务：" + DstSpringUtil.getAppName() +"；环境：" + DstSpringUtil.getActiveProfile() +"】启动成功，耗时：" +new DecimalFormat("#.##").format(stopWatch.getTotalTimeSeconds()) + " 秒。");}/*** kill -15时执行改钩子函数  优雅停机* 1.线程锁住* 2.运维那边监控到，然后进行kill  -15 进程ID* 3.代码这边监听到关闭信号，先把容器权重设置为0，不允许新的请求进来.* 4.然后为了保住容器其他请求中的接口不受影响，进行睡眠30s再关闭容器*/@Overridepublic void run(String... args) {log.info("启动成功 !");Runtime.getRuntime().addShutdownHook(new Thread(() -> {log.info("收到服务关闭信号");stop();try {log.info("睡眠30秒");Thread.sleep(30000);} catch (InterruptedException e) {throw new RuntimeException(e);}applicationContext.close();}));}private void stop() {try {Properties properties = new Properties();properties.put(PropertyKeyConst.NAMESPACE, nacosDiscoveryProperties.getNamespace());properties.put(PropertyKeyConst.SERVER_ADDR, nacosDiscoveryProperties.getServerAddr());NamingService namingService = NacosFactory.createNamingService(properties);String serviceName = nacosDiscoveryProperties.getService();List<Instance> instanceList = namingService.getAllInstances(serviceName);Optional<Instance> currentInstance = instanceList.stream().filter(instance -> instance.getIp().equals(nacosDiscoveryProperties.getIp())).findFirst();currentInstance.ifPresent(instance -> {log.info("找到当前服务实例: {}", instance);instance.setWeight(0);try {namingService.registerInstance(serviceName, instance);log.info("Nacos 服务权重已设置为 0");} catch (NacosException e) {log.error("设置 Nacos 服务权重时发生错误", e);}});} catch (NacosException e) {log.error("获取 Nacos 命名服务时发生错误", e);}}@Overridepublic void setApplicationContext(ApplicationContext applicationContext) {if (applicationContext instanceof ConfigurableApplicationContext) {this.applicationContext = (ConfigurableApplicationContext) applicationContext;}}}