private final List<FileSystemLocationSnapshot> removedSnapshots = new ArrayList<>();
    private final List<FileSystemLocationSnapshot> addedSnapshots = new ArrayList<>();

    public void publishSnapshotDiff(SnapshotHierarchy.SnapshotDiffListener snapshotDiffListener) {
        if (!removedSnapshots.isEmpty() || !addedSnapshots.isEmpty()) {
            snapshotDiffListener.changed(removedSnapshots, addedSnapshots);
        }