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    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.testing.nio;
  
  import javax.net.ssl.SSLContext;
  
  import org.apache.hc.core5.http.config.CharCodingConfig;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.impl.HttpProcessors;
  import org.apache.hc.core5.http.impl.nio.ServerHttp1StreamDuplexerFactory;
  import org.apache.hc.core5.http.nio.AsyncServerExchangeHandler;
  import org.apache.hc.core5.http.nio.HandlerFactory;
  import org.apache.hc.core5.http.protocol.HttpProcessor;
  import org.apache.hc.core5.http2.HttpVersionPolicy;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.http2.impl.H2Processors;
  import org.apache.hc.core5.http2.impl.nio.ServerH2StreamMultiplexerFactory;
  import org.apache.hc.core5.http2.impl.nio.ServerHttpProtocolNegotiator;
  import org.apache.hc.core5.reactor.IOEventHandler;
  import org.apache.hc.core5.reactor.IOEventHandlerFactory;
  import org.apache.hc.core5.reactor.ProtocolIOSession;
  import org.apache.hc.core5.reactor.ssl.SSLSessionInitializer;
  import org.apache.hc.core5.reactor.ssl.SSLSessionVerifier;
  import org.apache.hc.core5.util.Args;
  
  class InternalServerH2EventHandlerFactory implements IOEventHandlerFactory {
  
      private final HttpProcessor httpProcessor;
      private final HandlerFactory<AsyncServerExchangeHandler> exchangeHandlerFactory;
      private final HttpVersionPolicy versionPolicy;
      private final H2Config h2Config;
      private final Http1Config http1Config;
      private final CharCodingConfig charCodingConfig;
      private final SSLContext sslContext;
      private final SSLSessionInitializer sslSessionInitializer;
      private final SSLSessionVerifier sslSessionVerifier;
  
      public InternalServerH2EventHandlerFactory(
              final HttpProcessor httpProcessor,
              final HandlerFactory<AsyncServerExchangeHandler> exchangeHandlerFactory,
              final HttpVersionPolicy versionPolicy,
              final H2Config h2Config,
              final Http1Config http1Config,
              final CharCodingConfig charCodingConfig,
              final SSLContext sslContext,
              final SSLSessionInitializer sslSessionInitializer,
              final SSLSessionVerifier sslSessionVerifier) {
          this.httpProcessor = Args.notNull(httpProcessor, "HTTP processor");
          this.exchangeHandlerFactory = Args.notNull(exchangeHandlerFactory, "Exchange handler factory");
          this.versionPolicy = versionPolicy != null ? versionPolicy : HttpVersionPolicy.NEGOTIATE;
          this.h2Config = h2Config != null ? h2Config : H2Config.DEFAULT;
          this.http1Config = http1Config != null ? http1Config : Http1Config.DEFAULT;
          this.charCodingConfig = charCodingConfig != null ? charCodingConfig : CharCodingConfig.DEFAULT;
          this.sslContext = sslContext;
          this.sslSessionInitializer = sslSessionInitializer;
          this.sslSessionVerifier = sslSessionVerifier;
      }
  
      @Override
      public IOEventHandler createHandler(final ProtocolIOSession ioSession, final Object attachment) {
          if (sslContext != null) {
              ioSession.startTls(sslContext, null, null, sslSessionInitializer, sslSessionVerifier, null);
          }
          final ServerHttp1StreamDuplexerFactoryhtml#ServerHttp1StreamDuplexerFactory">ServerHttp1StreamDuplexerFactory http1StreamHandlerFactory = new ServerHttp1StreamDuplexerFactory(
                  httpProcessor != null ? httpProcessor : HttpProcessors.server(),
                  exchangeHandlerFactory,
                  http1Config,
                  charCodingConfig,
                  LoggingHttp1StreamListener.INSTANCE_SERVER);
          final ServerH2StreamMultiplexerFactory.html#ServerH2StreamMultiplexerFactory">ServerH2StreamMultiplexerFactory http2StreamHandlerFactory = new ServerH2StreamMultiplexerFactory(
                  httpProcessor != null ? httpProcessor : H2Processors.server(),
                  exchangeHandlerFactory,
                  h2Config,
                  charCodingConfig,
                 LoggingH2StreamListener.INSTANCE);
         return new ServerHttpProtocolNegotiator(
                         ioSession,
                         http1StreamHandlerFactory,
                         http2StreamHandlerFactory,
                         versionPolicy);
     }
 
 }