com.liferay.portal.kernel.trash.TrashHandlerRegistryUtil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of com.liferay.portal.kernel Show documentation
Contains interfaces for the portal services. Interfaces are only loaded by the global class loader and are shared by all plugins.
There is a newer version: 156.0.0
Show newest version
/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.kernel.trash;

import com.liferay.portal.kernel.util.ListUtil;
import com.liferay.registry.Registry;
import com.liferay.registry.RegistryUtil;
import com.liferay.registry.ServiceReference;
import com.liferay.registry.ServiceRegistration;
import com.liferay.registry.ServiceTracker;
import com.liferay.registry.ServiceTrackerCustomizer;
import com.liferay.registry.collections.ServiceRegistrationMap;
import com.liferay.registry.collections.ServiceRegistrationMapImpl;

import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentSkipListMap;

/**
 * @author Alexander Chow
 */
public class TrashHandlerRegistryUtil {

	public static TrashHandler getTrashHandler(String className) {
		return _instance._getTrashHandler(className);
	}

	public static List getTrashHandlers() {
		return _instance._getTrashHandlers();
	}

	public static void register(List trashHandlers) {
		for (TrashHandler trashHandler : trashHandlers) {
			register(trashHandler);
		}
	}

	public static void register(TrashHandler trashHandler) {
		_instance._register(trashHandler);
	}

	public static void unregister(List trashHandlers) {
		for (TrashHandler trashHandler : trashHandlers) {
			unregister(trashHandler);
		}
	}

	public static void unregister(TrashHandler trashHandler) {
		_instance._unregister(trashHandler);
	}

	private TrashHandlerRegistryUtil() {
		Registry registry = RegistryUtil.getRegistry();

		_serviceTracker = registry.trackServices(
			TrashHandler.class, new TrashHandlerServiceTrackerCustomizer());

		_serviceTracker.open();
	}

	private TrashHandler _getTrashHandler(String className) {
		return _trashHandlers.get(className);
	}

	private List _getTrashHandlers() {
		return ListUtil.fromMapValues(_trashHandlers);
	}

	private void _register(TrashHandler trashHandler) {
		Registry registry = RegistryUtil.getRegistry();

		ServiceRegistration serviceRegistration =
			registry.registerService(TrashHandler.class, trashHandler);

		_serviceRegistrations.put(trashHandler, serviceRegistration);
	}

	private void _unregister(TrashHandler trashHandler) {
		ServiceRegistration serviceRegistration =
			_serviceRegistrations.remove(trashHandler);

		if (serviceRegistration != null) {
			serviceRegistration.unregister();
		}
	}

	private static final TrashHandlerRegistryUtil _instance =
		new TrashHandlerRegistryUtil();

	private final ServiceRegistrationMap _serviceRegistrations =
		new ServiceRegistrationMapImpl<>();
	private final ServiceTracker _serviceTracker;
	private final Map _trashHandlers =
		new ConcurrentSkipListMap<>();

	private class TrashHandlerServiceTrackerCustomizer
		implements ServiceTrackerCustomizer {

		@Override
		public TrashHandler addingService(
			ServiceReference serviceReference) {

			Registry registry = RegistryUtil.getRegistry();

			TrashHandler trashHandler = registry.getService(serviceReference);

			_trashHandlers.put(trashHandler.getClassName(), trashHandler);

			return trashHandler;
		}

		@Override
		public void modifiedService(
			ServiceReference serviceReference,
			TrashHandler trashHandler) {
		}

		@Override
		public void removedService(
			ServiceReference serviceReference,
			TrashHandler trashHandler) {

			Registry registry = RegistryUtil.getRegistry();

			registry.ungetService(serviceReference);

			_trashHandlers.remove(trashHandler.getClassName());
		}

	}

}