/*
 * Copyright 2009 Red Hat, Inc.
 *
 * Red Hat licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package org.jboss.netty.handler.timeout;

import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;

/**
 * An extended {@link SimpleChannelUpstreamHandler} that adds the handler method
 * for an {@link IdleStateEvent}.
 *
 * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
 * @author <a href="http://gleamynode.net/">Trustin Lee</a>
 * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
 *
 * @apiviz.uses org.jboss.netty.handler.timeout.IdleStateEvent
 */
public class IdleStateAwareChannelUpstreamHandler extends SimpleChannelUpstreamHandler {

    /**
     * Creates a new instance.
     */
    public IdleStateAwareChannelUpstreamHandler() {
        super();
    }

    @Override
    public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e)
            throws Exception {
        if (e instanceof IdleStateEvent) {
            channelIdle(ctx, (IdleStateEvent) e);
        } else {
            super.handleUpstream(ctx, e);
        }
    }

    /**
     * Invoked when a {@link Channel} has been idle for a while.
     */
    public void channelIdle(ChannelHandlerContext ctx, IdleStateEvent e) throws Exception {
        ctx.sendUpstream(e);
    }
}
