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
021package org.apache.directory.server.ntp.protocol;
022
023
024import org.apache.directory.server.ntp.NtpService;
025import org.apache.directory.server.ntp.messages.NtpMessage;
026import org.apache.directory.server.ntp.service.NtpServiceImpl;
027import org.apache.mina.core.service.IoHandlerAdapter;
028import org.apache.mina.core.session.IoSession;
029import org.slf4j.Logger;
030import org.slf4j.LoggerFactory;
031
032
033/**
034 * The NTP protocol handler. It implements the {@link org.apache.mina.core.service.IoHandler#messageReceived} method,
035 * which returns the NTP reply. The {@link org.apache.mina.core.service.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 */
040public class NtpProtocolHandler extends IoHandlerAdapter
041{
042    /** the log for this class */
043    private static final Logger LOG = LoggerFactory.getLogger( NtpProtocolHandler.class );
044
045    /** The NtpService instance */
046    private NtpService ntpService = new NtpServiceImpl();
047
048
049    /**
050     * {@inheritDoc}
051     */
052    @Override
053    public void exceptionCaught( IoSession session, Throwable cause )
054    {
055        LOG.error( session.getRemoteAddress() + " EXCEPTION", cause );
056        session.closeNow();
057    }
058
059
060    /**
061     * {@inheritDoc}
062     */
063    @Override
064    public void messageReceived( IoSession session, Object message )
065    {
066        if ( LOG.isDebugEnabled() )
067        {
068            LOG.debug( "{} RCVD:  {}", session.getRemoteAddress(), message );
069        }
070
071        NtpMessage reply = ntpService.getReplyFor( ( NtpMessage ) message );
072
073        session.write( reply );
074    }
075}