* resources are released and all following calls to [.newSource] return null. Guarded by this.
   */
  var sourceCount = 0

  val isClosed: Boolean
    get() = file == null

  @Throws(IOException::class)
  private fun writeHeader(
    prefix: ByteString,
    upstreamSize: Long,
    metadataSize: Long,
  ) {
    val header =

 *     Reference<?> reference = new FinalizablePhantomReference<MyServer>(myServer, frq) {
 *       public void finalizeReferent() {
 *         references.remove(this):
 *         if (!serverSocket.isClosed()) {
 *           ...log a message about how nobody called close()...
 *           try {
 *             serverSocket.close();
 *           } catch (IOException e) {
 *             ...
 *           }
 *         }

  @Synchronized
  @Throws(IOException::class)
  override fun flush() {
    if (!initialized) return

    checkNotClosed()
    trimToSize()
    journalWriter!!.flush()
  }

  @Synchronized fun isClosed(): Boolean = closed

  /** Closes this cache. Stored values will remain on the filesystem. */
  @Synchronized
  @Throws(IOException::class)
  override fun close() {
    if (!initialized || closed) {

    public boolean isDisconnected () {
        Socket s = this.socket;
        return super.isDisconnected() || s == null || s.isClosed();
    }


    @Override
    public boolean isFailed () {
        Socket s = this.socket;
        return super.isFailed() || s == null || s.isClosed();
    }


    @Override
    public boolean hasCapability ( int cap ) throws SmbException {

    cache =
      DiskLruCache(filesystem, cacheDir, appVersion, 2, Int.MAX_VALUE.toLong(), taskRunner).also {
        toClose.add(it)
      }
    assertThat(cache.isClosed()).isFalse()
    cache.close()
    assertThat(cache.isClosed()).isTrue()
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)
  fun journalWriteFailsDuringEdit(parameters: Pair<FileSystem, Boolean>) {

		defer c.connMu.Unlock()
		c.clientPingInterval = args[0].(time.Duration)
	case debugAddToDeadline:
		c.addDeadline = args[0].(time.Duration)
	case debugIsOutgoingClosed:
		// params: muxID uint64, isClosed func(bool)
		muxID := args[0].(uint64)
		resp := args[1].(func(b bool))
		mid, ok := c.outgoing.Load(muxID)
		if !ok || mid == nil {
			resp(true)
			return
		}
		mid.respMu.Lock()

	public final fun directoryPath ()Lokio/Path;
	public final fun evictAll ()V
	public fun flush ()V
	public final fun hitCount ()I
	public final fun initialize ()V
	public final fun isClosed ()Z
	public static final fun key (Lokhttp3/HttpUrl;)Ljava/lang/String;
	public final fun maxSize ()J
	public final fun networkCount ()I
	public final fun requestCount ()I
	public final fun size ()J