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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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.
   */
  package io.netty.example.factorial;
  
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.compression.ZlibCodecFactory;
  import io.netty.handler.codec.compression.ZlibWrapper;
  import io.netty.handler.ssl.SslContext;
  
  /**
   * Creates a newly configured {@link ChannelPipeline} for a server-side channel.
   */
  public class FactorialServerInitializer extends ChannelInitializer<SocketChannel> {
  
      private final SslContext sslCtx;
  
      public FactorialServerInitializer(SslContext sslCtx) {
          this.sslCtx = sslCtx;
      }
  
      @Override
      public void initChannel(SocketChannel ch) {
          ChannelPipeline pipeline = ch.pipeline();
  
          if (sslCtx != null) {
              pipeline.addLast(sslCtx.newHandler(ch.alloc()));
          }
  
          // Enable stream compression (you can remove these two if unnecessary)
          pipeline.addLast(ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
          pipeline.addLast(ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
  
          // Add the number codec first,
          pipeline.addLast(new BigIntegerDecoder());
          pipeline.addLast(new NumberEncoder());
  
          // and then business logic.
          // Please note we create a handler for every new channel
          // because it has stateful properties.
          pipeline.addLast(new FactorialServerHandler());
      }
  }