if (call.connection != null) {
      check(toClose == null)
      return ReusePlan(candidate)
    }

    // The call's connection was released.
    toClose?.closeQuietly()
    call.eventListener.connectionReleased(call, candidate)
    candidate.connectionListener.connectionReleased(candidate, call)
    if (toClose != null) {
      candidate.connectionListener.connectionClosed(candidate)
    } else if (noNewExchangesEvent) {

	public fun requestHeadersStart (Lokhttp3/Call;)V
	public fun responseBodyEnd (Lokhttp3/Call;J)V
	public fun responseBodyStart (Lokhttp3/Call;)V
	public fun responseFailed (Lokhttp3/Call;Ljava/io/IOException;)V
	public fun responseHeadersEnd (Lokhttp3/Call;Lokhttp3/Response;)V
	public fun responseHeadersStart (Lokhttp3/Call;)V
	public fun satisfactionFailure (Lokhttp3/Call;Lokhttp3/Response;)V

        .build()
    val call = client.newCall(request)

    // Check the Kotlin-focused APIs.
    assertThat(call.tag(String::class)).isEqualTo("hello")
    assertThat(call.tag(Integer::class)).isEqualTo(5)
    assertThat(call.tag(Boolean::class)).isNull()
    assertThat(call.tag(Any::class)).isNull()

    // Check the Java APIs too.
    assertThat(call.tag(String::class.java)).isEqualTo("hello")

      if (e != null) {
        call.eventListener.requestFailed(call, e)
      } else {
        call.eventListener.requestBodyEnd(call, bytesRead)
      }
    }
    if (responseDone) {
      if (e != null) {
        call.eventListener.responseFailed(call, e)
      } else {
        call.eventListener.responseBodyEnd(call, bytesRead)
      }
    }
    return call.messageDone(
      exchange = this,

    call: Call,
    ioe: IOException,
  ) = onEvent(ResponseFailed(System.nanoTime(), call, ioe))

  override fun callEnd(call: Call) = onEvent(CallEnd(System.nanoTime(), call))

  override fun callFailed(
    call: Call,
    ioe: IOException,
  ) = onEvent(CallFailed(System.nanoTime(), call, ioe))

  override fun canceled(call: Call) = onEvent(Canceled(System.nanoTime(), call))

    }

    @Override public void callStart(Call call) {
      printEvent("callStart");
    }

    @Override public void proxySelectStart(Call call, HttpUrl url) {
      printEvent("proxySelectStart");
    }

    @Override public void proxySelectEnd(Call call, HttpUrl url, List<Proxy> proxies) {
      printEvent("proxySelectEnd");
    }

    @Override public void dnsStart(Call call, String domainName) {

    override val timestampNs: Long,
    val route: Route,
    val call: Call,
  ) : ConnectionEvent()

  data class ConnectFailed(
    override val timestampNs: Long,
    val route: Route,
    val call: Call,
    val exception: IOException,
  ) : ConnectionEvent() {
    override fun closes(event: ConnectionEvent): Boolean = event is ConnectStart && call == event.call && route == event.route
  }

  data class ConnectEnd(

        .build();

    final long startNanos = System.nanoTime();
    final Call call = client.newCall(request);

    // Schedule a job to cancel the call in 1 second.
    executor.schedule(() -> {
      System.out.printf("%.2f Canceling call.%n", (System.nanoTime() - startNanos) / 1e9f);
      call.cancel();
      System.out.printf("%.2f Canceled call.%n", (System.nanoTime() - startNanos) / 1e9f);
    }, 1, TimeUnit.SECONDS);

      .tag(Integer.class, 5)
      .tag(String.class, "hello")
      .build();
    Call call = client.newCall(request);

    assertEquals(5, call.tag(Integer.class));
    assertEquals("hello", call.tag(String.class));
    assertEquals(null, call.tag(Boolean.class));
    assertEquals(null, call.tag(Object.class));
  }

  @Test
  public void tagsCanBeComputed() {
    Request request = new Request.Builder()

) : EventSource,
  ServerSentEventReader.Callback,
  Callback {
  private var call: Call? = null

  @Volatile private var canceled = false

  fun connect(callFactory: Call.Factory) {
    call =
      callFactory.newCall(request).apply {
        enqueue(this@RealEventSource)
      }
  }

  override fun onResponse(
    call: Call,
    response: Response,
  ) {
    processResponse(response)
  }