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1   /*
2    * Copyright 2012 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 org.jboss.netty.example.discard;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.channel.ChannelEvent;
20  import org.jboss.netty.channel.ChannelHandlerContext;
21  import org.jboss.netty.channel.ChannelStateEvent;
22  import org.jboss.netty.channel.ExceptionEvent;
23  import org.jboss.netty.channel.MessageEvent;
24  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
25  
26  /**
27   * Handles a server-side channel.
28   */
29  public class DiscardServerHandler extends SimpleChannelUpstreamHandler {
30  
31      private long transferredBytes;
32  
33      public long getTransferredBytes() {
34          return transferredBytes;
35      }
36  
37      @Override
38      public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
39          if (e instanceof ChannelStateEvent) {
40              System.err.println(e);
41          }
42  
43          // Let SimpleChannelHandler call actual event handler methods below.
44          super.handleUpstream(ctx, e);
45      }
46  
47      @Override
48      public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
49          // Discard received data silently by doing nothing.
50          transferredBytes += ((ChannelBuffer) e.getMessage()).readableBytes();
51      }
52  
53      @Override
54      public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
55          // Close the connection when an exception is raised.
56          e.getCause().printStackTrace();
57          e.getChannel().close();
58      }
59  }