apollo-client/src/main/java/com/ctrip/framework/apollo/internals/PropertiesCompatibleFileConfigRepository.java/PropertiesCompatibleFileConfigRepository/PropertiesCompatibleFileConfigRepository
class PropertiesCompatibleFileConfigRepository:  public PropertiesCompatibleFileConfigRepository(PropertiesCompatibleConfigFile configFile) {
    this.configFile = configFile;
    this.configFile.addChangeListener(this);
    this.trySync();
  }