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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.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  public class EchoServerHandler extends SimpleChannelUpstreamHandler {
    32
    33      private static final Logger logger = Logger.getLogger(
    34              EchoServerHandler.class.getName());
    35
    36      private final AtomicLong transferredBytes = new AtomicLong();
    37
    38      public long getTransferredBytes() {
    39          return transferredBytes.get();
    40      }
    41
    42      @Override
    43      public void messageReceived(
    44              ChannelHandlerContext ctx, MessageEvent e) {
    45          // Send back the received message to the remote peer.
    46          transferredBytes.addAndGet(((ChannelBuffer) e.getMessage()).readableBytes());
    47          e.getChannel().write(e.getMessage());
    48      }
    49
    50      @Override
    51      public void exceptionCaught(
    52              ChannelHandlerContext ctx, ExceptionEvent e) {
    53          // Close the connection when an exception is raised.
    54          logger.log(
    55                  Level.WARNING,
    56                  "Unexpected exception from downstream.",
    57                  e.getCause());
    58          e.getChannel().close();
    59      }
    60  }