*/
  @ExperimentalOkHttpApi
  fun setPolicy(
    address: Address,
    policy: AddressPolicy,
  ) {
    delegate.setPolicy(address, policy)
  }

  /**
   * A policy for how the pool should treat a specific address.
   */
  class AddressPolicy(
    /**
     * How many concurrent calls should be possible to make at any time.

    /**
     * Returns an error for the DNS query.
     */
    fun onFailure(
      hostname: String,
      e: IOException,
    )
  }

  /**
   * Class of DNS addresses, such that clients that treat these differently, such
   * as attempting IPv6 first, can make such decisions.
   */
  @ExperimentalOkHttpApi
  enum class DnsClass(val type: Int) {
    IPV4(TYPE_A),
    IPV6(TYPE_AAAA),
  }

@Tag("Slowish")
class RelayTest {
  @TempDir
  var tempDir: File? = null
  private val executor = Executors.newCachedThreadPool(threadFactory("RelayTest"))
  private val metadata: ByteString = "great metadata!".encodeUtf8()
  private lateinit var file: File

  @BeforeEach
  fun setUp() {
    file = File(tempDir, "test")
  }

  @AfterEach
  fun tearDown() {
    executor.shutdown()
  }