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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.handler.timeout;
    17
    18  import org.jboss.netty.channel.Channel;
    19  import org.jboss.netty.channel.ChannelEvent;
    20  import org.jboss.netty.channel.ChannelHandlerContext;
    21  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    22
    23  /**
    24   * An extended {@link SimpleChannelUpstreamHandler} that adds the handler method
    25   * for an {@link IdleStateEvent}.
    26   *
    27   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    28   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    29   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
    30   *
    31   * @apiviz.uses org.jboss.netty.handler.timeout.IdleStateEvent
    32   */
    33  public class IdleStateAwareChannelUpstreamHandler extends SimpleChannelUpstreamHandler {
    34
    35      /**
    36       * Creates a new instance.
    37       */
    38      public IdleStateAwareChannelUpstreamHandler() {
    39          super();
    40      }
    41
    42      @Override
    43      public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e)
    44              throws Exception {
    45          if (e instanceof IdleStateEvent) {
    46              channelIdle(ctx, (IdleStateEvent) e);
    47          } else {
    48              super.handleUpstream(ctx, e);
    49          }
    50      }
    51
    52      /**
    53       * Invoked when a {@link Channel} has been idle for a while.
    54       */
    55      public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) throws Exception {
    56          ctx.sendUpstream(e);
    57      }
    58  }