*/
    fun <T : Any> useForStateLoad(stateType: StateType, action: (ConfigurationCacheStateFile) -> T): T

    /**
     * Writes some value to zero or more state files.
     */
    fun <T> useForStore(action: (ConfigurationCacheRepository.Layout) -> T): T

    /**
     * Creates a new [ValueStore] that can be used to load and store multiple values.
     */
    fun <T> createValueStore(
        stateType: StateType,

            return withExclusiveAccessToCache(baseDir) { cacheDir ->
                action(ReadableLayout(cacheDir))
            }
        }

        override fun <T> useForStore(action: (Layout) -> T): T =
            withExclusiveAccessToCache(baseDir) { cacheDir ->
                // TODO GlobalCache require(!cacheDir.isDirectory)
                Files.createDirectories(cacheDir.toPath())