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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.discard;
    17
    18  import java.util.logging.Level;
    19  import java.util.logging.Logger;
    20
    21  import org.jboss.netty.buffer.ChannelBuffer;
    22  import org.jboss.netty.channel.ChannelEvent;
    23  import org.jboss.netty.channel.ChannelHandlerContext;
    24  import org.jboss.netty.channel.ChannelStateEvent;
    25  import org.jboss.netty.channel.ExceptionEvent;
    26  import org.jboss.netty.channel.MessageEvent;
    27  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    28
    29  /**
    30   * Handles a server-side channel.
    31   */
    32  public class DiscardServerHandler extends SimpleChannelUpstreamHandler {
    33
    34      private static final Logger logger = Logger.getLogger(
    35              DiscardServerHandler.class.getName());
    36
    37      private long transferredBytes;
    38
    39      public long getTransferredBytes() {
    40          return transferredBytes;
    41      }
    42
    43      @Override
    44      public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
    45          if (e instanceof ChannelStateEvent) {
    46              logger.info(e.toString());
    47          }
    48
    49          // Let SimpleChannelHandler call actual event handler methods below.
    50          super.handleUpstream(ctx, e);
    51      }
    52
    53      @Override
    54      public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
    55          // Discard received data silently by doing nothing.
    56          transferredBytes += ((ChannelBuffer) e.getMessage()).readableBytes();
    57      }
    58
    59      @Override
    60      public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
    61          // Close the connection when an exception is raised.
    62          logger.log(
    63                  Level.WARNING,
    64                  "Unexpected exception from downstream.",
    65                  e.getCause());
    66          e.getChannel().close();
    67      }
    68  }