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   /*
    * Copyright 2020 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.stomp.websocket;
  
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.socket.SocketChannel;
  import io.netty.handler.codec.http.HttpObjectAggregator;
  import io.netty.handler.codec.http.HttpServerCodec;
  import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
  import io.netty.util.internal.ObjectUtil;
  
  public class StompWebSocketChatServerInitializer extends ChannelInitializer<SocketChannel> {
  
      private final String chatPath;
      private final StompWebSocketProtocolCodec stompWebSocketProtocolCodec;
  
      public StompWebSocketChatServerInitializer(String chatPath) {
          this.chatPath = ObjectUtil.checkNotNull(chatPath, "chatPath");
          stompWebSocketProtocolCodec = new StompWebSocketProtocolCodec();
      }
  
      @Override
      protected void initChannel(SocketChannel channel) throws Exception {
          channel.pipeline()
                 .addLast(new HttpServerCodec())
                 .addLast(new HttpObjectAggregator(65536))
                 .addLast(StompWebSocketClientPageHandler.INSTANCE)
                 .addLast(new WebSocketServerProtocolHandler(chatPath, StompVersion.SUB_PROTOCOLS))
                 .addLast(stompWebSocketProtocolCodec);
      }
  }