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 *     https://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 */
020package org.apache.directory.api.ldap.codec.protocol.mina;
021
022
023import org.apache.directory.api.ldap.codec.api.LdapApiService;
024import org.osgi.framework.BundleActivator;
025import org.osgi.framework.BundleContext;
026import org.osgi.framework.ServiceReference;
027import org.osgi.framework.ServiceRegistration;
028import org.osgi.util.tracker.ServiceTracker;
029import org.osgi.util.tracker.ServiceTrackerCustomizer;
030
031
032/**
033 * The {@link org.osgi.framework.BundleActivator} for the codec.
034 *
035 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
036 */
037public class LdapProtocolCodecActivator implements BundleActivator
038{
039    private ServiceTracker<LdapApiService, LdapApiService> serviceTracker;
040
041    class LdapApiServiceTracker implements ServiceTrackerCustomizer<LdapApiService, LdapApiService>
042    {
043        private BundleContext bundleContext;
044        private ServiceRegistration<?> registration;
045
046
047        LdapApiServiceTracker( BundleContext context )
048        {
049            this.bundleContext = context;
050        }
051
052
053        @Override
054        public LdapApiService addingService( ServiceReference<LdapApiService> reference )
055        {
056            LdapApiService ldapApiService = bundleContext.getService( reference );
057            LdapProtocolCodecFactory factory = new LdapProtocolCodecFactory( ldapApiService );
058            registration = bundleContext.registerService( LdapProtocolCodecFactory.class.getName(), factory, null );
059            ldapApiService.registerProtocolCodecFactory( factory );
060            return ldapApiService;
061        }
062
063
064        @Override
065        public void modifiedService( ServiceReference<LdapApiService> reference, LdapApiService service )
066        {
067            // Do nothing ATM
068        }
069
070
071        @Override
072        public void removedService( ServiceReference<LdapApiService> reference, LdapApiService service )
073        {
074            // TODO should we unregister the LdapProtocolCodecFactory at LdapApiService?
075            // ldapApiService.unregisterProtocolCodecFactory( factory );
076            registration.unregister();
077        }
078    }
079
080
081    /**
082     * Create a new instance of a LdapProtocolCodecActivator 
083     */
084    public LdapProtocolCodecActivator()
085    {
086        // Default constructor
087    }
088
089
090    /**
091     * {@inheritDoc}
092     */
093    @Override
094    public void start( BundleContext bundleContext ) throws Exception
095    {
096        LdapApiServiceTracker ldapApiServiceTracker = new LdapApiServiceTracker( bundleContext );
097        serviceTracker = new ServiceTracker<>( bundleContext, LdapApiService.class,
098            ldapApiServiceTracker );
099        serviceTracker.open();
100    }
101
102
103    /**
104     * {@inheritDoc}
105     */
106    @Override
107    public void stop( BundleContext bundleContext ) throws Exception
108    {
109        serviceTracker.close();
110    }
111}