}

  init {
    require(maxSize > 0L) { "maxSize <= 0" }
    require(valueCount > 0) { "valueCount <= 0" }

    this.journalFile = directory / JOURNAL_FILE
    this.journalFileTmp = directory / JOURNAL_FILE_TEMP
    this.journalFileBackup = directory / JOURNAL_FILE_BACKUP
  }

  @Synchronized
  @Throws(IOException::class)
  fun initialize() {
    this.assertThreadHoldsLock()

    if (initialized) {