apollo-client/src/main/java/com/ctrip/framework/apollo/internals/LocalFileConfigRepository.java/LocalFileConfigRepository/getConfig
class LocalFileConfigRepository:  @Override
  public Properties getConfig() {
    if (m_fileProperties == null) {
      sync();
    }
    Properties result = propertiesFactory.getPropertiesInstance();
    result.putAll(m_fileProperties);
    return result;
  }