import java.util.concurrent.LinkedBlockingQueue
import java.util.logging.Logger
import okhttp3.ExperimentalOkHttpApi

/**
 * Default dispatcher that processes a script of responses. Populate the script by calling [enqueueResponse].
 */
@ExperimentalOkHttpApi
open class QueueDispatcher : Dispatcher() {
  protected val responseQueue: BlockingQueue<MockResponse> = LinkedBlockingQueue()
  private var failFastResponse: MockResponse? = null

with OkHttp 3.x: must use `object :` with OkHttp 4.x:

Kotlin calling OkHttp 3.x:

```kotlin
val client = OkHttpClient.Builder()
    .dns { hostname -> InetAddress.getAllByName(hostname).toList() }
    .build()
```

Kotlin calling OkHttp 4.x:

```kotlin
val client = OkHttpClient.Builder()
    .dns(object : Dns {

smushcdn.com
wphostedmail.com
wpmucdn.com
tempurl.host
wpmudev.host

// Individual Network Berlin e.V. : https://www.in-berlin.de/
// Submitted by Christian Seitz <chris@in-berlin.de>
dyn-berlin.de
in-berlin.de
in-brb.de
in-butter.de
in-dsl.de
in-dsl.net
in-dsl.org
in-vpn.de
in-vpn.net
in-vpn.org

01CF          ; mapped                 ; 01D0          # 1.1  LATIN CAPITAL LETTER I WITH CARON
01D0          ; valid                                  # 1.1  LATIN SMALL LETTER I WITH CARON
01D1          ; mapped                 ; 01D2          # 1.1  LATIN CAPITAL LETTER O WITH CARON
01D2          ; valid                                  # 1.1  LATIN SMALL LETTER O WITH CARON