## Dispatch

For synchronous calls, you bring your own thread and are responsible for managing how many simultaneous requests you make. Too many simultaneous connections wastes resources; too few harms latency.

import java.io.IOException
import okhttp3.Protocol
import okio.BufferedSource

/**
 * [HTTP/2][Protocol.HTTP_2] only. Processes server-initiated HTTP requests on the client.
 * Implementations must quickly dispatch callbacks to avoid creating a bottleneck.
 *
 * While [onReset] may occur at any time, the following callbacks are expected in order,
 * correlated by stream ID.
 *
 *  * [onRequest]
 *  * [onHeaders] (unless canceled)

public abstract class okhttp3/mockwebserver/Dispatcher {
	public fun <init> ()V
	public abstract fun dispatch (Lokhttp3/mockwebserver/RecordedRequest;)Lokhttp3/mockwebserver/MockResponse;
	public fun peek ()Lokhttp3/mockwebserver/MockResponse;
	public fun shutdown ()V
}

public final class okhttp3/mockwebserver/MockResponse : java/lang/Cloneable {
	public static final field Companion Lokhttp3/mockwebserver/MockResponse$Companion;

   */
  @Test
  fun canceledBeforeIOSignalsOnFailure() {
    // Force requests to be executed serially.
    val dispatcher = Dispatcher(client.dispatcher.executorService)
    dispatcher.maxRequests = 1
    client =
      client.newBuilder()
        .dispatcher(dispatcher)
        .build()
    val requestA = Request(server.url("/a"))
    val requestB = Request(server.url("/b"))

  @Override public synchronized void onOpen(WebSocket webSocket, Response response) {
    System.out.println("onOpen: " + response);
  }

  // TOOD(jwilson): decode incoming messages and dispatch them somewhere.
  @Override public void onMessage(WebSocket webSocket, String text) {
    System.out.println("onMessage: " + text);
  }

  @Override public void onClosing(WebSocket webSocket, int code, String reason) {

    val connection = server.url("/").toUrl().openConnection() as HttpURLConnection
    connection.setReadTimeout(500)
    try {
      connection.getResponseCode()
      fail<Any>()
    } catch (expected: SocketTimeoutException) {
    }

    // Shutting down the server should unblock the dispatcher.
    server.shutdown()
  }

  @Test

  /**
   * The dispatcher used to respond to HTTP requests. The default dispatcher is a [QueueDispatcher],
   * which serves a fixed sequence of responses from a [queue][enqueue].
   *
   * Other dispatchers can be configured. They can vary the response based on timing or the content
   * of the request.
   */
  var dispatcher: Dispatcher = QueueDispatcher()

  private var portField: Int = -1

    // We use a re-entrant dispatcher to initiate one HTTPS connection while the other is in flight.
    server.dispatcher =
      object : Dispatcher() {
        var requestCount = 0

        override fun dispatch(request: RecordedRequest): MockResponse {
          val result = queueDispatcher.dispatch(request)
          requestCount++
          if (requestCount == 1) {

HSPLokhttp3/CookieJar$Companion$NoCookies;->loadForRequest(Lokhttp3/HttpUrl;)Ljava/util/List;
HSPLokhttp3/CookieJar;-><clinit>()V
HSPLokhttp3/Dispatcher;-><init>()V
HSPLokhttp3/Dispatcher;->finished$okhttp(Lokhttp3/internal/connection/RealCall$AsyncCall;)V
HSPLokhttp3/Dispatcher;->finished(Ljava/util/Deque;Ljava/lang/Object;)V
HSPLokhttp3/Dispatcher;->promoteAndExecute()Z
HSPLokhttp3/Dns$Companion$DnsSystem;-><init>()V

    callStart()
    try {
      client.dispatcher.executed(this)
      return getResponseWithInterceptorChain()
    } finally {
      client.dispatcher.finished(this)
    }
  }

  override fun enqueue(responseCallback: Callback) {
    check(executed.compareAndSet(false, true)) { "Already Executed" }

    callStart()
    client.dispatcher.enqueue(AsyncCall(responseCallback))
  }