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1   /*
2    * Copyright 2013 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.http.websocketx;
17  
18  
19  import io.netty.channel.ChannelHandlerContext;
20  import io.netty.handler.codec.MessageToMessageDecoder;
21  
22  import java.util.List;
23  
24  abstract class WebSocketProtocolHandler extends MessageToMessageDecoder<WebSocketFrame> {
25      @Override
26      protected void decode(ChannelHandlerContext ctx, WebSocketFrame frame, List<Object> out) throws Exception {
27          if (frame instanceof PingWebSocketFrame) {
28              frame.content().retain();
29              ctx.channel().writeAndFlush(new PongWebSocketFrame(frame.content()));
30              return;
31          }
32          if (frame instanceof PongWebSocketFrame) {
33              // Pong frames need to get ignored
34              return;
35          }
36  
37          out.add(frame.retain());
38      }
39  
40      @Override
41      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
42          ctx.close();
43      }
44  }