private val serverWriter =
    WebSocketWriter(
      isClient = false,
      sink = data,
      random = random,
      perMessageDeflate = false,
      noContextTakeover = false,
      minimumDeflateSize = 0L,
    )
  private val clientWriter =
    WebSocketWriter(
      isClient = true,
      sink = data,
      random = random,
      perMessageDeflate = false,
      noContextTakeover = false,
      minimumDeflateSize = 0L,

The `EventListener.Factory` also makes it possible to limit metrics to a subset of calls. This one captures metrics on a random 10%:

```java
class MetricsEventListener extends EventListener {
  private static final Factory FACTORY = new Factory() {
    @Override public EventListener create(Call call) {
      if (Math.random() < 0.10) {
        return new MetricsEventListener(call);
      } else {
        return EventListener.NONE;

class RealWebSocket(
  taskRunner: TaskRunner,
  /** The application's original request unadulterated by web socket headers. */
  private val originalRequest: Request,
  internal val listener: WebSocketListener,
  private val random: Random,
  private val pingIntervalMillis: Long,
  /**
   * For clients this is initially null, and will be assigned to the agreed-upon extensions. For
   * servers it should be the agreed-upon extensions immediately.
   */

    listener: WebSocketListener,
  ): WebSocket {
    val webSocket =
      RealWebSocket(
        taskRunner = taskRunner,
        originalRequest = request,
        listener = listener,
        random = Random(),
        pingIntervalMillis = pingIntervalMillis.toLong(),
        // extensions is always null for clients:
        extensions = null,
        minimumDeflateSize = minWebSocketMessageToCompress,

  // zero effect on the behavior of the WebSocket API which is why tests are only written once
  // from the perspective of a single peer.
  private val random = Random(0)
  private val client2Server = Pipe(8192L)
  private val server2client = Pipe(8192L)
  private val taskFaker = TaskFaker()
  private val client = TestStreams(true, taskFaker, server2client, client2Server)

import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.Test

class WebSocketReaderTest {
  private val data = Buffer()
  private val callback = WebSocketRecorder("client")
  private val random = Random(0)

  // Mutually exclusive. Use the one corresponding to the peer whose behavior you wish to test.
  private val serverReader =
    WebSocketReader(
      isClient = false,
      source = data,

 * limitations under the License.
 */
package okhttp3.internal.cache2

import assertk.assertThat
import assertk.assertions.isEqualTo
import java.io.File
import java.io.RandomAccessFile
import java.util.Random
import kotlin.test.assertFailsWith
import okio.Buffer
import okio.ByteString
import okio.ByteString.Companion.encodeUtf8
import okio.buffer
import okio.sink
import okio.source

Lkotlin/jvm/internal/TypeIntrinsics;
Lkotlin/jvm/internal/markers/KMappedMarker;
Lkotlin/jvm/internal/markers/KMutableList;
Lkotlin/random/AbstractPlatformRandom;
Lkotlin/random/FallbackThreadLocalRandom$implStorage$1;
Lkotlin/random/FallbackThreadLocalRandom;
Lkotlin/random/Random$Default;
Lkotlin/random/Random;
Lkotlin/ranges/IntProgression;
Lkotlin/ranges/IntProgressionIterator;
Lkotlin/ranges/IntRange;

  private val handshakeCertificates = platform.localhostHandshakeCertificates()
  private val clientListener = WebSocketRecorder("client")
  private val serverListener = WebSocketRecorder("server")
  private val random = Random(0)
  private var client =
    clientTestRule.newClientBuilder()
      .writeTimeout(Duration.ofMillis(500))
      .readTimeout(Duration.ofMillis(500))
      .addInterceptor(

 *  Fix: Change `MediaType.charset()` to return null for unexpected charsets.
 *  Fix: Don't skip cache invalidation if the invalidating response has no body.
 *  Fix: Don't use a cryptographic random number generator for web sockets. Some Android devices
    implement `SecureRandom` incorrectly!
 *  Fix: Correctly canonicalize IPv6 addresses in `HttpUrl`. This prevented OkHttp from trusting