001    /**
002     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.kernel.atom;
016    
017    import aQute.bnd.annotation.ProviderType;
018    
019    import com.liferay.portal.kernel.log.Log;
020    import com.liferay.portal.kernel.log.LogFactoryUtil;
021    import com.liferay.portal.kernel.util.ListUtil;
022    import com.liferay.registry.Registry;
023    import com.liferay.registry.RegistryUtil;
024    import com.liferay.registry.ServiceReference;
025    import com.liferay.registry.ServiceTracker;
026    import com.liferay.registry.ServiceTrackerCustomizer;
027    
028    import java.util.List;
029    import java.util.Map;
030    import java.util.concurrent.ConcurrentHashMap;
031    
032    /**
033     * @author Igor Spasic
034     */
035    @ProviderType
036    public class AtomCollectionAdapterRegistryUtil {
037    
038            public static AtomCollectionAdapter<?> getAtomCollectionAdapter(
039                    String collectionName) {
040    
041                    return _instance._getAtomCollectionAdapter(collectionName);
042            }
043    
044            public static List<AtomCollectionAdapter<?>> getAtomCollectionAdapters() {
045                    return _instance._getAtomCollectionAdapters();
046            }
047    
048            private AtomCollectionAdapterRegistryUtil() {
049                    Registry registry = RegistryUtil.getRegistry();
050    
051                    _serviceTracker = registry.trackServices(
052                            (Class<AtomCollectionAdapter<?>>)(Class<?>)
053                                    AtomCollectionAdapter.class,
054                            new AtomCollectionAdapterServiceTrackerCustomizer());
055    
056                    _serviceTracker.open();
057            }
058    
059            private AtomCollectionAdapter<?> _getAtomCollectionAdapter(
060                    String collectionName) {
061    
062                    return _atomCollectionAdapters.get(collectionName);
063            }
064    
065            private List<AtomCollectionAdapter<?>> _getAtomCollectionAdapters() {
066                    return ListUtil.fromMapValues(_atomCollectionAdapters);
067            }
068    
069            private static final Log _log = LogFactoryUtil.getLog(
070                    AtomCollectionAdapterRegistryUtil.class);
071    
072            private static final AtomCollectionAdapterRegistryUtil _instance =
073                    new AtomCollectionAdapterRegistryUtil();
074    
075            private final Map<String, AtomCollectionAdapter<?>>
076                    _atomCollectionAdapters = new ConcurrentHashMap<>();
077            private final
078                    ServiceTracker<AtomCollectionAdapter<?>, AtomCollectionAdapter<?>>
079                            _serviceTracker;
080    
081            private class AtomCollectionAdapterServiceTrackerCustomizer
082                    implements ServiceTrackerCustomizer
083                            <AtomCollectionAdapter<?>, AtomCollectionAdapter<?>> {
084    
085                    @Override
086                    public AtomCollectionAdapter<?> addingService(
087                            ServiceReference<AtomCollectionAdapter<?>> serviceReference) {
088    
089                            Registry registry = RegistryUtil.getRegistry();
090    
091                            AtomCollectionAdapter<?> atomCollectionAdapter =
092                                    registry.getService(serviceReference);
093    
094                            if (_atomCollectionAdapters.containsKey(
095                                            atomCollectionAdapter.getCollectionName())) {
096    
097                                    if (_log.isWarnEnabled()) {
098                                            _log.warn(
099                                                    "Duplicate collection name " +
100                                                            atomCollectionAdapter.getCollectionName());
101                                    }
102    
103                                    return null;
104                            }
105    
106                            _atomCollectionAdapters.put(
107                                    atomCollectionAdapter.getCollectionName(),
108                                    atomCollectionAdapter);
109    
110                            return atomCollectionAdapter;
111                    }
112    
113                    @Override
114                    public void modifiedService(
115                            ServiceReference<AtomCollectionAdapter<?>> serviceReference,
116                            AtomCollectionAdapter<?> atomCollectionAdapter) {
117                    }
118    
119                    @Override
120                    public void removedService(
121                            ServiceReference<AtomCollectionAdapter<?>> serviceReference,
122                            AtomCollectionAdapter<?> atomCollectionAdapter) {
123    
124                            Registry registry = RegistryUtil.getRegistry();
125    
126                            registry.ungetService(serviceReference);
127    
128                            _atomCollectionAdapters.remove(
129                                    atomCollectionAdapter.getCollectionName());
130                    }
131    
132            }
133    
134    }