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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.telnet;
    17
    18  import java.util.logging.Level;
    19  import java.util.logging.Logger;
    20
    21  import org.jboss.netty.channel.ChannelEvent;
    22  import org.jboss.netty.channel.ChannelHandlerContext;
    23  import org.jboss.netty.channel.ChannelStateEvent;
    24  import org.jboss.netty.channel.ExceptionEvent;
    25  import org.jboss.netty.channel.MessageEvent;
    26  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    27
    28  /**
    29   * Handles a client-side channel.
    30   */
    31  public class TelnetClientHandler extends SimpleChannelUpstreamHandler {
    32
    33      private static final Logger logger = Logger.getLogger(
    34              TelnetClientHandler.class.getName());
    35
    36      @Override
    37      public void handleUpstream(
    38              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
    39          if (e instanceof ChannelStateEvent) {
    40              logger.info(e.toString());
    41          }
    42          super.handleUpstream(ctx, e);
    43      }
    44
    45      @Override
    46      public void messageReceived(
    47              ChannelHandlerContext ctx, MessageEvent e) {
    48          // Print out the line received from the server.
    49          System.err.println(e.getMessage());
    50      }
    51
    52      @Override
    53      public void exceptionCaught(
    54              ChannelHandlerContext ctx, ExceptionEvent e) {
    55          logger.log(
    56                  Level.WARNING,
    57                  "Unexpected exception from downstream.",
    58                  e.getCause());
    59          e.getChannel().close();
    60      }
    61  }