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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:
    *
    *   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.
   */
  //The MIT License
  //
  //Copyright (c) 2009 Carl Bystršm
  //
  //Permission is hereby granted, free of charge, to any person obtaining a copy
  //of this software and associated documentation files (the "Software"), to deal
  //in the Software without restriction, including without limitation the rights
  //to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  //copies of the Software, and to permit persons to whom the Software is
  //furnished to do so, subject to the following conditions:
  //
  //The above copyright notice and this permission notice shall be included in
  //all copies or substantial portions of the Software.
  //
  //THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  //IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  //FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  //AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  //LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  //OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  //THE SOFTWARE.
  
  package org.jboss.netty.example.http.websocketx.client;
  
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.channel.ChannelStateEvent;
  import org.jboss.netty.channel.ExceptionEvent;
  import org.jboss.netty.channel.MessageEvent;
  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
  import org.jboss.netty.handler.codec.http.HttpResponse;
  import org.jboss.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
  import org.jboss.netty.handler.codec.http.websocketx.PingWebSocketFrame;
  import org.jboss.netty.handler.codec.http.websocketx.PongWebSocketFrame;
  import org.jboss.netty.handler.codec.http.websocketx.TextWebSocketFrame;
  import org.jboss.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
  import org.jboss.netty.handler.codec.http.websocketx.WebSocketFrame;
  import org.jboss.netty.util.CharsetUtil;
  
  public class WebSocketClientHandler extends SimpleChannelUpstreamHandler {
  
      private final WebSocketClientHandshaker handshaker;
  
      public WebSocketClientHandler(WebSocketClientHandshaker handshaker) {
          this.handshaker = handshaker;
      }
  
      @Override
      public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
          System.err.println("WebSocket Client disconnected!");
      }
  
      @Override
      public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
          Channel ch = ctx.getChannel();
          if (!handshaker.isHandshakeComplete()) {
              handshaker.finishHandshake(ch, (HttpResponse) e.getMessage());
              System.err.println("WebSocket Client connected!");
              return;
          }
  
          if (e.getMessage() instanceof HttpResponse) {
              HttpResponse response = (HttpResponse) e.getMessage();
              throw new IllegalStateException(
                      "unexpected response (status=" + response.getStatus() +
                              ", content=" + response.getContent().toString(CharsetUtil.UTF_8) + ')');
          }
  
          WebSocketFrame frame = (WebSocketFrame) e.getMessage();
          if (frame instanceof TextWebSocketFrame) {
              TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
              System.err.println("WebSocket Client received message: " + textFrame.getText());
          } else if (frame instanceof PongWebSocketFrame) {
              System.err.println("WebSocket Client received pong");
          } else if (frame instanceof CloseWebSocketFrame) {
              System.err.println("WebSocket Client received closing");
              ch.close();
          } else if (frame instanceof PingWebSocketFrame) {
              System.err.println("WebSocket Client received ping, response with pong");
              ch.write(new PongWebSocketFrame(frame.getBinaryData()));
          }
      }
  
      @Override
     public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
         e.getCause().printStackTrace();
         e.getChannel().close();
     }
 }