public void subscribe(@NotNull ExternalSystemSettingsListener<PS> listener, @NotNull Disposable parentDisposable) {
    Logger.getInstance(AbstractExternalSystemSettings.class)
      .error("Unimplemented subscribe method for " + getClass());
    subscribe(listener); // Api backward compatibility
  }
public void subscribe(@NotNull ExternalSystemSettingsListener<PS> listener, @NotNull Disposable parentDisposable)