监听事件

在spring-cloud-starter-alibaba-nacos-discovery中并未找到获取服务注册时进行会发布的事件，直接监听InstancesChangeEvent事件的发布，服务的上下线都会触发该事件

package com.rycem.gateway.notifier;

import com.alibaba.nacos.api.naming.pojo.Instance;
import com.alibaba.nacos.client.naming.event.InstancesChangeEvent;
import com.alibaba.nacos.common.notify.Event;
import com.alibaba.nacos.common.notify.NotifyCenter;
import com.alibaba.nacos.common.notify.listener.Subscriber;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.rycem.gateway.notifier.api.FeiShuRobotApi;
import com.rycem.gateway.notifier.entity.FeiShuResponse;
import com.rycem.gateway.notifier.entity.NacosInstanceOnDownLineRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.List;

@Component
public class NacosServiceInstanceChangeNotifier extends Subscriber<InstancesChangeEvent> {

    @Autowired
    private FeiShuRobotApi feiShuRobotApi;

    @Value("${env.test}")
    private Boolean test;

    @PostConstruct
    public void registerToNotifyCenter() {
        NotifyCenter.registerSubscriber(this);
    }

    private boolean isWinOs() {
        String os = System.getProperty("os.name").toLowerCase();
        return os.contains("windows 10");
    }

    @Override
    public void onEvent(InstancesChangeEvent instancesChangeEvent) {
        String serviceName = instancesChangeEvent.getServiceName();
        List<Instance> hosts = instancesChangeEvent.getHosts();
        int envCode;
        if (isWinOs()) {
            return;
        } else if (test) {
            envCode = 1;
        } else {
            envCode = 2;
        }
        boolean online = hosts != null && !hosts.isEmpty();
        String json = NacosInstanceOnDownLineRequest.json(online, envCode, serviceName);
        try {
            FeiShuResponse post = feiShuRobotApi.post(json);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
    }

    @Override
    public Class<? extends Event> subscribeType() {
        return InstancesChangeEvent.class;
    }
}