RemoteConfigLongPollService：远程配置长轮循服务，负责长轮循ConfigServer变更通知，当有更新时立即轮循触发更新

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目录

概 述

RemoteConfigLongPollService：
远程配置长轮循服务，负责长轮循ConfigServer变更通知，当有更新时立即轮循触发更新
第一步RemetoConfigRepository构造中scheduleLongPollingRefresh()方法进入该类

private void scheduleLongPollingRefresh() {
   
   
    remoteConfigLongPollService.submit(m_namespace, this);
  }

进入RemoteCOnfigLongPollService下面方法

public boolean submit(String namespace, RemoteConfigRepository remoteConfigRepository) {
   
   
    boolean added = m_longPollNamespaces.put(namespace, remoteConfigRepository);
    m_notifications.putIfAbsent(namespace, INIT_NOTIFICATION_ID);
     若未启动长轮询定时任务，进行启动
    if (!m_longPollStarted.get()) {
   
   
      startLongPolling();
    }
    return added

若未启动长轮循，进行启动

private void startLongPolling() {
   
   
    if (!m_longPollStarted.compareAndSet(false, true)) {
   
   
      //already started
      return;
    }
    try {
   
   
      final String appId = m_configUtil.getAppId();
      final String cluster = m_configUtil.getCluster();
      final String dataCenter = m_configUtil.getDataCenter();
      final long longPollingInitialDelayInMills = m_configUtil.getLongPollingInitialDelayInMills();
      m_longPollingService.submit(new Runnable() {
   
   
        @Override
        public void run() {
   
   
          if (longPollingInitialDelayInMills > 0) {
   
   
            try {
   
   
              logger.debug("Long polling will start in {} ms.", longPollingInitialDelayInMills);