apollo-client/src/main/java/com/ctrip/framework/apollo/internals/RemoteConfigRepository.java/RemoteConfigRepository/getConfig
class RemoteConfigRepository:  @Override
  public Properties getConfig() {
    if (m_configCache.get() == null) {
      this.sync();
    }
    return transformApolloConfigToProperties(m_configCache.get());
  }