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1   /*
2    * Copyright 2009 Red Hat, Inc.
3    *
4    * Red Hat licenses this file to you under the Apache License, version 2.0
5    * (the "License"); you may not use this file except in compliance with the
6    * 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.telnet;
17  
18  import java.util.logging.Level;
19  import java.util.logging.Logger;
20  
21  import org.jboss.netty.channel.ChannelEvent;
22  import org.jboss.netty.channel.ChannelHandlerContext;
23  import org.jboss.netty.channel.ChannelStateEvent;
24  import org.jboss.netty.channel.ExceptionEvent;
25  import org.jboss.netty.channel.MessageEvent;
26  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
27  
28  /**
29   * Handles a client-side channel.
30   *
31   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
32   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
33   *
34   * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
35   */
36  public class TelnetClientHandler extends SimpleChannelUpstreamHandler {
37  
38      private static final Logger logger = Logger.getLogger(
39              TelnetClientHandler.class.getName());
40  
41      @Override
42      public void handleUpstream(
43              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
44          if (e instanceof ChannelStateEvent) {
45              logger.info(e.toString());
46          }
47          super.handleUpstream(ctx, e);
48      }
49  
50      @Override
51      public void messageReceived(
52              ChannelHandlerContext ctx, MessageEvent e) {
53          // Print out the line received from the server.
54          System.err.println(e.getMessage());
55      }
56  
57      @Override
58      public void exceptionCaught(
59              ChannelHandlerContext ctx, ExceptionEvent e) {
60          logger.log(
61                  Level.WARNING,
62                  "Unexpected exception from downstream.",
63                  e.getCause());
64          e.getChannel().close();
65      }
66  }