import okio.Source
import okio.buffer

/**
 * Transmits a single HTTP request and a response pair. This layers connection management and events
 * on [ExchangeCodec], which handles the actual I/O.
 */
class Exchange(
  internal val call: RealCall,
  internal val eventListener: EventListener,
  internal val finder: ExchangeFinder,
  private val codec: ExchangeCodec,
) {

    private void put(TransferEvent event, boolean last) {
        try {
            Exchange exchange;
            if (blockOnLastEvent && last) {
                exchange = new BlockingExchange(event);
            } else {
                exchange = new Exchange(event);
            }
            eventQueue.put(exchange);
            exchange.waitForProcessed();
        } catch (InterruptedException e) {

  private val index: Int,
  internal val exchange: Exchange?,
  internal val request: Request,
  internal val connectTimeoutMillis: Int,
  internal val readTimeoutMillis: Int,
  internal val writeTimeoutMillis: Int,
) : Interceptor.Chain {
  private var calls: Int = 0

  internal fun copy(
    index: Int = this.index,
    exchange: Exchange? = this.exchange,
    request: Request = this.request,

      if (shouldIgnoreAndWaitForRealResponse(code, exchange)) {
        responseBuilder = exchange.readResponseHeaders(expectContinue = false)!!
        if (invokeStartEvent) {
          exchange.responseHeadersStart()
        }
        response =
          responseBuilder
            .request(request)
            .handshake(exchange.connection.handshake())
            .sentRequestAtMillis(sentRequestMillis)

}

internal var RealConnection.idleAtNsAccessor: Long
  get() = idleAtNs
  set(value) {
    idleAtNs = value
  }

internal val Response.exchangeAccessor: Exchange?
  get() = this.exchange

internal val Exchange.connectionAccessor: RealConnection
  get() = this.connection

  @Throws(IOException::class)
  override fun intercept(chain: Interceptor.Chain): Response {
    val realChain = chain as RealInterceptorChain
    val exchange = realChain.call.initExchange(realChain)
    val connectedChain = realChain.copy(exchange = exchange)
    return connectedChain.proceed(realChain.request)
  }

import okhttp3.Address
import okhttp3.HttpUrl

/**
 * Policy on choosing which connection to use for an exchange and any retries that follow. This uses
 * the following strategies:
 *
 *  1. If the current call already has a connection that can satisfy the request it is used. Using
 *     the same connection for an initial exchange and its follow-ups may improve locality.
 *

package okhttp3

import okio.IOException

interface Callback {
  /**
   * Called when the request could not be executed due to cancellation, a connectivity problem or
   * timeout. Because networks can fail during an exchange, it is possible that the remote server
   * accepted the request before the failure.
   */
  fun onFailure(
    call: Call,
    e: IOException,
  )

  /**

 * **Exchange** carries a single HTTP request/response pair.

 * **ExchangeFinder** chooses which connection carries each exchange. Where possible it will use the same connection for all exchanges in a single call. It prefers reusing pooled connections over establishing new connections.      

        this.username = userName;
    }

    /**
     * Get the passphrase of the private key file. The passphrase is used only when host/protocol supports
     * authentication via exchange of private/public keys and private key was used for authentication.
     *
     * @return passphrase of the private key file
     */
    public String getPassphrase() {
        return passphrase;
    }

    /**