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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.echo;
    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.buffer.ChannelBuffer;
    23  import org.jboss.netty.channel.ChannelHandlerContext;
    24  import org.jboss.netty.channel.ExceptionEvent;
    25  import org.jboss.netty.channel.MessageEvent;
    26  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    27
    28  /**
    29   * Handler implementation for the echo server.
    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 EchoServerHandler extends SimpleChannelUpstreamHandler {
    37
    38      private static final Logger logger = Logger.getLogger(
    39              EchoServerHandler.class.getName());
    40
    41      private final AtomicLong transferredBytes = new AtomicLong();
    42
    43      public long getTransferredBytes() {
    44          return transferredBytes.get();
    45      }
    46
    47      @Override
    48      public void messageReceived(
    49              ChannelHandlerContext ctx, MessageEvent e) {
    50          // Send back the received message to the remote peer.
    51          transferredBytes.addAndGet(((ChannelBuffer) e.getMessage()).readableBytes());
    52          e.getChannel().write(e.getMessage());
    53      }
    54
    55      @Override
    56      public void exceptionCaught(
    57              ChannelHandlerContext ctx, ExceptionEvent e) {
    58          // Close the connection when an exception is raised.
    59          logger.log(
    60                  Level.WARNING,
    61                  "Unexpected exception from downstream.",
    62                  e.getCause());
    63          e.getChannel().close();
    64      }
    65  }