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1   /*
2    * Copyright 2010 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.objectecho;
17  
18  import java.util.concurrent.atomic.AtomicLong;
19  import java.util.logging.Level;
20  import java.util.logging.Logger;
21  
22  import org.jboss.netty.channel.ChannelEvent;
23  import org.jboss.netty.channel.ChannelHandlerContext;
24  import org.jboss.netty.channel.ChannelState;
25  import org.jboss.netty.channel.ChannelStateEvent;
26  import org.jboss.netty.channel.ExceptionEvent;
27  import org.jboss.netty.channel.MessageEvent;
28  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
29  
30  /**
31   * Handles both client-side and server-side handler depending on which
32   * constructor was called.
33   *
34   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
35   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
36   *
37   * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
38   */
39  public class ObjectEchoServerHandler extends SimpleChannelUpstreamHandler {
40  
41      private static final Logger logger = Logger.getLogger(
42              ObjectEchoServerHandler.class.getName());
43  
44      private final AtomicLong transferredMessages = new AtomicLong();
45  
46      public long getTransferredMessages() {
47          return transferredMessages.get();
48      }
49  
50      @Override
51      public void handleUpstream(
52              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
53          if (e instanceof ChannelStateEvent &&
54              ((ChannelStateEvent) e).getState() != ChannelState.INTEREST_OPS) {
55              logger.info(e.toString());
56          }
57          super.handleUpstream(ctx, e);
58      }
59  
60      @Override
61      public void messageReceived(
62              ChannelHandlerContext ctx, MessageEvent e) {
63          // Echo back the received object to the client.
64          transferredMessages.incrementAndGet();
65          e.getChannel().write(e.getMessage());
66      }
67  
68      @Override
69      public void exceptionCaught(
70              ChannelHandlerContext ctx, ExceptionEvent e) {
71          logger.log(
72                  Level.WARNING,
73                  "Unexpected exception from downstream.",
74                  e.getCause());
75          e.getChannel().close();
76      }
77  }