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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.discard;
    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.ChannelEvent;
    24  import org.jboss.netty.channel.ChannelHandlerContext;
    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 a server-side channel.
    32   *
    33   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    34   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    35   *
    36   * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
    37   */
    38  public class DiscardServerHandler extends SimpleChannelUpstreamHandler {
    39
    40      private static final Logger logger = Logger.getLogger(
    41              DiscardServerHandler.class.getName());
    42
    43      private final AtomicLong transferredBytes = new AtomicLong();
    44
    45      public long getTransferredBytes() {
    46          return transferredBytes.get();
    47      }
    48
    49      @Override
    50      public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
    51          if (e instanceof ChannelStateEvent) {
    52              logger.info(e.toString());
    53          }
    54
    55          // Let SimpleChannelHandler call actual event handler methods below.
    56          super.handleUpstream(ctx, e);
    57      }
    58
    59      @Override
    60      public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
    61          // Discard received data silently by doing nothing.
    62          transferredBytes.addAndGet(((ChannelBuffer) e.getMessage()).readableBytes());
    63      }
    64
    65      @Override
    66      public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
    67          // Close the connection when an exception is raised.
    68          logger.log(
    69                  Level.WARNING,
    70                  "Unexpected exception from downstream.",
    71                  e.getCause());
    72          e.getChannel().close();
    73      }
    74  }