#### Do-stuff-later pool

Sometimes there's an action required like calling the application layer or responding to a ping, and the thread discovering the action is not the thread that should do the work. We enqueue a runnable on this executor and it gets handled by one of the executor's threads.

### Locks

We have 3 different things that we synchronize on.

#### Http2Connection

  private val client = OkHttpClient()

  fun run() {
    val request =
      Request.Builder()
        .url("http://publicobject.com/helloworld.txt")
        .build()

    client.newCall(request).enqueue(
      object : Callback {
        override fun onFailure(
          call: Call,
          e: IOException,
        ) {
          e.printStackTrace()
        }

        override fun onResponse(

class DevServer {
  val handshakeCertificates = TlsUtil.localhost()

  val server =
    MockWebServer().apply {
      useHttps(handshakeCertificates.sslSocketFactory(), false)

      enqueue(
        MockResponse()
          .setResponseCode(HTTP_MOVED_TEMP)
          .setHeader("Location", "https://www.google.com/robots.txt"),
      )
    }

  val clientCertificates =

  val clientRule = OkHttpClientTestRule()

  @Test
  fun passingTest() {
    assertThat("hello").isEqualTo("hello")
  }

  @Test
  fun testMockWebServer(server: MockWebServer) {
    server.enqueue(MockResponse(body = "abc"))

    val client = clientRule.newClient()

    client.newCall(Request(url = server.url("/"))).execute().use {
      assertThat(it.body.string()).isEqualTo("abc")
    }
  }

  @Test

        .build()

    serverRule.server.useHttps(localhost.sslSocketFactory())
  }

  @Test
  @Ignore("java.net.UnknownHostException: No results for localhost, in CI.")
  fun testRequest() {
    serverRule.server.enqueue(MockResponse())

    val call = client.newCall(Request(serverRule.server.url("/")))

    call.execute().use { response ->
      assertThat(response.code).isEqualTo(200)
    }
  }

  @Test

  private val client = HttpClient()

  @BeforeEach fun setUp() {
    client.start()
  }

  @AfterEach fun tearDown() {
    client.stop()
  }

  @Test fun get(server: MockWebServer) {
    server.enqueue(MockResponse(body = "hello, Jetty HTTP Client"))

    val request =
      client.newRequest(server.url("/").toUri())
        .header("Accept", "text/plain")
    val response = request.send()

Calls are executed in one of two ways:

 * **Synchronous:** your thread blocks until the response is readable.
 * **Asynchronous:** you enqueue the request on any thread, and get [called back](https://square.github.io/okhttp/4.x/okhttp/okhttp3/-callback/) on another thread when the response is readable.

/**
 * OkHttp.
 *
 * https://square.github.io/okhttp/
 */
class OkHttpClientTest {
  @JvmField @RegisterExtension
  val platform = PlatformRule()

  @Test fun get(server: MockWebServer) {
    server.enqueue(MockResponse(body = "hello, OkHttp"))

    val client = OkHttpClient()

    val request =
      Request.Builder()
        .url(server.url("/"))
        .header("Accept", "text/plain")
        .build()

  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)
  }

  fun processResponse(response: Response) {

  @BeforeEach
  fun setup(server: MockWebServer) {
    this.server = server

    server.enqueue(MockResponse())

    client =
      clientTestRule.newClientBuilder()
        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        )