* @param factory
     *            The {@link Traverser} factory for the protocol. Must not be {@literal null}.
     */
    public static void addTraverserFactory(final String protocol, final TraverserFactory factory) {
        assertArgumentNotEmpty("protocol", protocol);
        assertArgumentNotNull("factory", factory);

        traverserFactories.put(protocol, factory);
    }

    /**

0001 0.624 responseBodyEnd
0001 0.624 connectionReleased
0001 0.624 callEnd
```

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) {

    private static final Logger logger = LogManager.getLogger(FessResponseProcessor.class);

    /** Factory for creating and managing ingesters */
    private IngestFactory ingestFactory = null;

    /**
     * Initializes the processor after dependency injection.
     * Sets up the ingest factory if available in the component system.
     */
    @PostConstruct
    public void init() {

    val timeMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs)
    logger.log("[$timeMs ms] $message")
  }

  open class Factory
    @JvmOverloads
    constructor(
      private val logger: HttpLoggingInterceptor.Logger = HttpLoggingInterceptor.Logger.DEFAULT,
    ) : EventListener.Factory {
      override fun create(call: Call): EventListener = LoggingEventListener(logger)
    }

  companion object

      sslParameters.applicationProtocols = Platform.alpnProtocolNames(protocols).toTypedArray()

      bcSocket.parameters = sslParameters
    }
  }

  companion object {
    val factory =
      object : DeferredSocketAdapter.Factory {
        override fun matchesSocket(sslSocket: SSLSocket): Boolean = isSupported && sslSocket is BCSSLSocket

        override fun create(sslSocket: SSLSocket): SocketAdapter = BouncyCastleSocketAdapter()

            return crawlerClientFactory;
        }
        final CrawlerClientFactory factory = creator.get();

        final FileAuthenticationService fileAuthenticationService = ComponentUtil.getComponent(FileAuthenticationService.class);

        //  Parameters
        final Map<String, Object> paramMap = new HashMap<>();
        factory.setInitParameterMap(paramMap);

        super.tearDown();
    }

    // Test constructor
    public void test_constructor() {
        ScriptEngineFactory factory = new ScriptEngineFactory();
        assertNotNull(factory);
        assertNotNull(factory.scriptEngineMap);
        assertTrue(factory.scriptEngineMap.isEmpty());
    }

    // Test add method with valid parameters
    public void test_add_validParameters() {

    })
    .build()
```

SAM conversion impacts these APIs:

 * Authenticator
 * Dispatcher.setIdleCallback(Runnable)
 * Dns
 * EventListener.Factory
 * HttpLoggingInterceptor.Logger
 * LoggingEventListener.Factory
 * OkHttpClient.Builder.hostnameVerifier(HostnameVerifier)

JetBrains [is working on][kotlin_sams] SAM conversions of Kotlin interfaces. Expect it in a future

                return snapshotXml;
            }
        };

        try {
            javax.xml.parsers.DocumentBuilderFactory factory = javax.xml.parsers.DocumentBuilderFactory.newInstance();
            javax.xml.parsers.DocumentBuilder builder = factory.newDocumentBuilder();
            String result = testHelper.getSnapshotActualVersion(builder, "test-url/", "1.0.0-SNAPSHOT");

      // Enable ALPN.
      val names = Platform.alpnProtocolNames(protocols)
      Conscrypt.setApplicationProtocols(sslSocket, names.toTypedArray())
    }
  }

  companion object {
    val factory =
      object : DeferredSocketAdapter.Factory {
        override fun matchesSocket(sslSocket: SSLSocket): Boolean = isSupported && Conscrypt.isConscrypt(sslSocket)