private static final int NUMBER_OF_GROUPING_DIRS = 3;
    public static final int FILE_TREE_DEPTH_TO_TRACK_AND_CLEANUP = NUMBER_OF_GROUPING_DIRS + NUMBER_OF_CHECKSUM_DIRS;

    private static final Grouper<ModuleComponentArtifactIdentifier> GROUPER = new Grouper<ModuleComponentArtifactIdentifier>() {
        @Override
        public String determineGroup(ModuleComponentArtifactIdentifier artifactId) {

    private final Grouper<K> grouper;
    private final Namer<K> namer;
    private final FileAccessTracker checksumDirAccessTracker;
    private final File baseDir;
    private final ChecksumService checksumService;

    public GroupedAndNamedUniqueFileStore(File baseDir, TemporaryFileProvider temporaryFileProvider, FileAccessTimeJournal fileAccessTimeJournal, Grouper<K> grouper, Namer<K> namer, ChecksumService checksumService) {

    private static final int NUMBER_OF_GROUPING_DIRS = 1;
    public static final int FILE_TREE_DEPTH_TO_TRACK_AND_CLEANUP = NUMBER_OF_GROUPING_DIRS + NUMBER_OF_CHECKSUM_DIRS;

    private static final Grouper<String> GROUPER = new Grouper<String>() {
        @Override
        public String determineGroup(String s) {
            return String.valueOf(Math.abs(s.hashCode()) % 100);
        }

        @Override

    FileAccessTimeJournal fileAccessTimeJournal = Mock(FileAccessTimeJournal)
    GroupedAndNamedUniqueFileStore.Grouper<String> grouper = new GroupedAndNamedUniqueFileStore.Grouper<String>() {
        @Override
        String determineGroup(String key) {
            return 'group'
        }
        @Override
        int getNumberOfGroupingDirs() {

            "io.github.http-builder-ng.test"
        ]) as Set == [["org", "jetbrains"], ["io","github", "http-builder-ng"]] as Set
    }

    def "groups entries which have the same module component id"() {
        grouper {
            entry("org", "foo", "1.0", "foo-1.0.jar").addVerifiedKey(KEY_1)
            entry("org", "foo", "1.0", "foo-1.0.pom").addVerifiedKey(KEY_1)
        }

        when:
        executeGrouping()

        for (String ignoredKey : collectedIgnoredKeys) {
            verificationsBuilder.addIgnoredKey(new IgnoredKey(ignoredKey, KEY_NOT_DOWNLOADED));
        }
        PgpKeyGrouper grouper = new PgpKeyGrouper(verificationsBuilder, entriesToBeWritten);
        grouper.performPgpKeyGrouping();
    }

    }

    public static <K, V> Map<K, Collection<V>> groupBy(Iterable<? extends V> iterable, Transformer<? extends K, V> grouper) {
        logDeprecation(7);
        ImmutableListMultimap.Builder<K, V> builder = ImmutableListMultimap.builder();

        for (V element : iterable) {
            K key = grouper.transform(element);
            builder.put(key, element);
        }

        return builder.build().asMap();
    }

    }

    public static <K, V> Map<K, Collection<V>> groupBy(Iterable<? extends V> iterable, InternalTransformer<? extends K, V> grouper) {
        ImmutableListMultimap.Builder<K, V> builder = ImmutableListMultimap.builder();

        for (V element : iterable) {
            K key = grouper.transform(element);
            builder.put(key, element);
        }

        return builder.build().asMap();
    }

	github.com/kyoh86/exportloopref v0.1.11 // indirect
	github.com/ldez/gomoddirectives v0.2.3 // indirect
	github.com/ldez/tagliatelle v0.5.0 // indirect
	github.com/leonklingele/grouper v1.1.1 // indirect
	github.com/lufeee/execinquery v1.2.1 // indirect
	github.com/macabu/inamedparam v0.1.3 // indirect
	github.com/magiconair/properties v1.8.6 // indirect

github.com/ldez/tagliatelle v0.5.0 h1:epgfuYt9v0CG3fms0pEgIMNPuFf/LpPIfjk4kyqSioo=
github.com/ldez/tagliatelle v0.5.0/go.mod h1:rj1HmWiL1MiKQuOONhd09iySTEkUuE/8+5jtPYz9xa4=
github.com/leonklingele/grouper v1.1.1 h1:suWXRU57D4/Enn6pXR0QVqqWWrnJ9Osrz+5rjt8ivzU=
github.com/leonklingele/grouper v1.1.1/go.mod h1:uk3I3uDfi9B6PeUjsCKi6ndcf63Uy7snXgR4yDYQVDY=
github.com/lufeee/execinquery v1.2.1 h1:hf0Ems4SHcUGBxpGN7Jz78z1ppVkP/837ZlETPCEtOM=