apollo-client/src/main/java/com/ctrip/framework/apollo/internals/RemoteConfigLongPollService.java/RemoteConfigLongPollService/submit
class RemoteConfigLongPollService:  public boolean submit(String namespace, RemoteConfigRepository remoteConfigRepository) {
    boolean added = m_longPollNamespaces.put(namespace, remoteConfigRepository);
    m_notifications.putIfAbsent(namespace, INIT_NOTIFICATION_ID);
    if (!m_longPollStarted.get()) {
      startLongPolling();
    }
    return added;
  }