private static final String MODULE_A = "module-a";
    private static final String MODULE_B = "module-b";
    private static final String MODULE_C = "module-c";
    private static final String MODULE_D = "module-d";
    private static final String MODULE_C_1 = "module-c-1";
    private static final String MODULE_C_2 = "module-c-2";

    private DefaultGraphBuilder graphBuilder;