if (localAddr != null) {
                    socket.bind(new InetSocketAddress(localAddr, localPort));
                }
                socket.connect(new InetSocketAddress(address.getHostAddress(), port), CONN_TIMEOUT);
                socket.setSoTimeout(SO_TIMEOUT);

                out = socket.getOutputStream();
                in = socket.getInputStream();
            }

          object : DelegatingSocketFactory(getDefault()) {
            @Throws(IOException::class)
            override fun configureSocket(socket: Socket): Socket {
              socket.setSendBufferSize(SOCKET_BUFFER_SIZE)
              socket.setReceiveBufferSize(SOCKET_BUFFER_SIZE)
              return socket
            }
          },
        ).build()
  }

  @AfterEach
  fun tearDown() {

    val serverSocket = ServerSocket(0, 1, localhost)

    val socket = Socket()
    socket.connect(serverSocket.localSocketAddress)
    val socketSource = socket.source().buffer()

    assertThat(socket.isHealthy(socketSource)).isTrue()

    serverSocket.close()
    assertThat(socket.isHealthy(socketSource)).isFalse()
  }

  @Test
  fun testDurationTimeUnit() {

import java.net.InetAddress;
import java.net.Socket;

import jcifs.smb1.Config;
import jcifs.smb1.util.LogStream;

/**
Do not use this class. Writing to the OutputStream of this type of socket
requires leaving a 4 byte prefix for the NBT header. IOW you must call
write( buf, 4, len ). Calling write( buf, 0, len ) will generate an error.
 */

public class NbtSocket extends Socket {

  }

  override fun createSocket(): Socket =
    object : Socket() {
      override fun connect(
        endpoint: SocketAddress?,
        timeout: Int,
      ) {
        val requested = (endpoint as InetSocketAddress)
        val inetSocketAddress = hostMapping[requested.address] ?: defaultAddress ?: requested
        Platform.get().log("Socket connection to: $inetSocketAddress was: $requested")

    ).filter { it.isSupported() }

  @Throws(IOException::class)
  override fun connectSocket(
    socket: Socket,
    address: InetSocketAddress,
    connectTimeout: Int,
  ) {
    try {
      socket.connect(address, connectTimeout)
    } catch (e: ClassCastException) {
      // On android 8.0, socket.connect throws a ClassCastException due to a bug
      // see https://issuetracker.google.com/issues/63649622

      .build()

  class SocketClosingEventListener : EventListener() {
    var shouldClose: Boolean = false
    var lastSocket: Socket? = null

    override fun connectionAcquired(
      call: Call,
      connection: Connection,
    ) {
      lastSocket = connection.socket()
    }

    override fun requestHeadersStart(call: Call) {
      if (shouldClose) {
        lastSocket!!.close()
      }
    }
  }

We can't rely on application threads to read data from the socket. Application threads are transient: sometimes they're reading and writing and sometimes they're off doing application-layer things. But the socket is permanent, and it needs constant attention: we dispatch all incoming frames so the connection is good-to-go when the application layer needs it.

So we have a dedicated thread for every socket that just reads frames and dispatches them.

  override val route: Route,
  /** The low-level TCP socket. */
  private val rawSocket: JavaNetSocket,
  /**
   * The application layer socket. Either an [SSLSocket] layered over [rawSocket], or [rawSocket]
   * itself if this connection does not use SSL.
   */
  private val javaNetSocket: JavaNetSocket,
  private val handshake: Handshake?,
  private val protocol: Protocol,
  private val socket: BufferedSocket,

  override fun getSupportedCipherSuites(): Array<String> = delegate.supportedCipherSuites

  @Throws(IOException::class)
  override fun createSocket(
    socket: Socket,
    host: String,
    port: Int,
    autoClose: Boolean,
  ): SSLSocket {
    val sslSocket = delegate.createSocket(socket, host, port, autoClose) as SSLSocket
    return configureSocket(sslSocket)
  }

  @Throws(IOException::class)