001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    
021    package org.apache.directory.server.ntp.protocol;
022    
023    
024    import org.apache.directory.server.ntp.NtpService;
025    import org.apache.directory.server.ntp.messages.NtpMessage;
026    import org.apache.directory.server.ntp.service.NtpServiceImpl;
027    import org.apache.mina.core.service.IoHandlerAdapter;
028    import org.apache.mina.core.session.IoSession;
029    import org.slf4j.Logger;
030    import org.slf4j.LoggerFactory;
031    
032    
033    /**
034     * The NTP protocol handler. It implements the {@link IoHandler#messageReceived} method,
035     * which returns the NTP reply. The {@link IoHandler#exceptionCaught} is also implemented,
036     * all the other methods are handled by the {@link IoHandlerAdapter} class.<br/>
037     * 
038     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
039     * @version $Rev: 725712 $, $Date: 2008-12-11 16:32:04 +0100 (Thu, 11 Dec 2008) $
040     */
041    public class NtpProtocolHandler extends IoHandlerAdapter
042    {
043        /** the log for this class */
044        private static final Logger log = LoggerFactory.getLogger( NtpProtocolHandler.class );
045    
046        /** The NtpService instance */
047        private NtpService ntpService = new NtpServiceImpl();
048    
049    
050        /**
051         * {@inheritDoc}
052         */
053        public void exceptionCaught( IoSession session, Throwable cause )
054        {
055            log.error( session.getRemoteAddress() + " EXCEPTION", cause );
056            session.close( true );
057        }
058    
059    
060        /**
061         * {@inheritDoc}
062         */
063        public void messageReceived( IoSession session, Object message )
064        {
065            if ( log.isDebugEnabled() )
066            {
067                log.debug( "{} RCVD:  {}", session.getRemoteAddress(), message );
068            }
069    
070            NtpMessage reply = ntpService.getReplyFor( ( NtpMessage ) message );
071    
072            session.write( reply );
073        }
074    }