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.portlet.dynamicdatamapping.util;
016    
017    import aQute.bnd.annotation.ProviderType;
018    
019    import com.liferay.portal.kernel.util.ListUtil;
020    import com.liferay.registry.Registry;
021    import com.liferay.registry.RegistryUtil;
022    import com.liferay.registry.ServiceReference;
023    import com.liferay.registry.ServiceRegistration;
024    import com.liferay.registry.ServiceTracker;
025    import com.liferay.registry.ServiceTrackerCustomizer;
026    import com.liferay.registry.collections.ServiceRegistrationMap;
027    
028    import java.util.List;
029    import java.util.Map;
030    import java.util.Set;
031    import java.util.concurrent.ConcurrentHashMap;
032    
033    /**
034     * @author Eduardo Garcia
035     */
036    @ProviderType
037    public class DDMDisplayRegistryUtil {
038    
039            public static DDMDisplay getDDMDisplay(String portletId) {
040                    return _instance._getDDMDisplay(portletId);
041            }
042    
043            public static List<DDMDisplay> getDDMDisplays() {
044                    return _instance._getDDMDisplays();
045            }
046    
047            public static String[] getPortletIds() {
048                    return _instance._getPortletIds();
049            }
050    
051            public static void register(DDMDisplay ddmDisplay) {
052                    _instance._register(ddmDisplay);
053            }
054    
055            public static void unregister(DDMDisplay ddmDisplay) {
056                    _instance._unregister(ddmDisplay);
057            }
058    
059            private DDMDisplayRegistryUtil() {
060                    Registry registry = RegistryUtil.getRegistry();
061    
062                    _serviceTracker = registry.trackServices(
063                            DDMDisplay.class, new DDMDisplayServiceTrackerCustomizer());
064    
065                    _serviceTracker.open();
066            }
067    
068            private DDMDisplay _getDDMDisplay(String portletId) {
069                    return _ddmDisplays.get(portletId);
070            }
071    
072            private List<DDMDisplay> _getDDMDisplays() {
073                    return ListUtil.fromMapValues(_ddmDisplays);
074            }
075    
076            private String[] _getPortletIds() {
077                    Set<String> portletIds = _ddmDisplays.keySet();
078    
079                    return portletIds.toArray(new String[portletIds.size()]);
080            }
081    
082            private void _register(DDMDisplay ddmDisplay) {
083                    Registry registry = RegistryUtil.getRegistry();
084    
085                    ServiceRegistration<DDMDisplay> serviceRegistration =
086                            registry.registerService(DDMDisplay.class, ddmDisplay);
087    
088                    _serviceRegistrations.put(ddmDisplay, serviceRegistration);
089            }
090    
091            private void _unregister(DDMDisplay ddmDisplay) {
092                    ServiceRegistration<DDMDisplay> serviceRegistration =
093                            _serviceRegistrations.remove(ddmDisplay);
094    
095                    if (serviceRegistration != null) {
096                            serviceRegistration.unregister();
097                    }
098            }
099    
100            private static final DDMDisplayRegistryUtil _instance =
101                    new DDMDisplayRegistryUtil();
102    
103            private final Map<String, DDMDisplay> _ddmDisplays =
104                    new ConcurrentHashMap<>();
105            private final ServiceRegistrationMap<DDMDisplay> _serviceRegistrations =
106                    new ServiceRegistrationMap<>();
107            private final ServiceTracker<DDMDisplay, DDMDisplay> _serviceTracker;
108    
109            private class DDMDisplayServiceTrackerCustomizer
110                    implements ServiceTrackerCustomizer<DDMDisplay, DDMDisplay> {
111    
112                    @Override
113                    public DDMDisplay addingService(
114                            ServiceReference<DDMDisplay> serviceReference) {
115    
116                            Registry registry = RegistryUtil.getRegistry();
117    
118                            DDMDisplay ddmDisplay = registry.getService(serviceReference);
119    
120                            _ddmDisplays.put(ddmDisplay.getPortletId(), ddmDisplay);
121    
122                            return ddmDisplay;
123                    }
124    
125                    @Override
126                    public void modifiedService(
127                            ServiceReference<DDMDisplay> serviceReference,
128                            DDMDisplay ddmDisplay) {
129                    }
130    
131                    @Override
132                    public void removedService(
133                            ServiceReference<DDMDisplay> serviceReference,
134                            DDMDisplay ddmDisplay) {
135    
136                            Registry registry = RegistryUtil.getRegistry();
137    
138                            registry.ungetService(serviceReference);
139    
140                            _ddmDisplays.remove(ddmDisplay.getPortletId());
141                    }
142    
143            }
144    
145    }