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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.worldclock;
  
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelPipeline;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.protobuf.ProtobufDecoder;
  import io.netty.handler.codec.protobuf.ProtobufEncoder;
  import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
  import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
  import io.netty.handler.ssl.SslContext;
  
  public class WorldClockServerInitializer extends ChannelInitializer<SocketChannel> {
  
      private final SslContext sslCtx;
  
      public WorldClockServerInitializer(SslContext sslCtx) {
          this.sslCtx = sslCtx;
      }
  
      @Override
      public void initChannel(SocketChannel ch) throws Exception {
          ChannelPipeline p = ch.pipeline();
          if (sslCtx != null) {
              p.addLast(sslCtx.newHandler(ch.alloc()));
          }
  
          p.addLast(new ProtobufVarint32FrameDecoder());
          p.addLast(new ProtobufDecoder(WorldClockProtocol.Locations.getDefaultInstance()));
  
          p.addLast(new ProtobufVarint32LengthFieldPrepender());
          p.addLast(new ProtobufEncoder());
  
          p.addLast(new WorldClockServerHandler());
      }
  }