default int calculateDownloads(@NotNull Map<String, Map<String, BuildTargetState>> commitSourcesState,
                                 @Nullable Map<String, Map<String, BuildTargetState>> currentSourcesState) {
    return 1;
  }
default int calculateDownloads(@NotNull Map<String, Map<String, BuildTargetState>> commitSourcesState,
                                 @Nullable Map<String, Map<String, BuildTargetState>> currentSourcesState)