chris@3: /*
chris@3:  *   SONEWS News Server
chris@3:  *   see AUTHORS for the list of contributors
chris@3:  *
chris@3:  *   This program is free software: you can redistribute it and/or modify
chris@3:  *   it under the terms of the GNU General Public License as published by
chris@3:  *   the Free Software Foundation, either version 3 of the License, or
chris@3:  *   (at your option) any later version.
chris@3:  *
chris@3:  *   This program is distributed in the hope that it will be useful,
chris@3:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@3:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@3:  *   GNU General Public License for more details.
chris@3:  *
chris@3:  *   You should have received a copy of the GNU General Public License
chris@3:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@3:  */
chris@3: package org.sonews.storage;
chris@3: 
chris@3: /**
cli@42:  * Provides access to a storage backend.
chris@3:  * @author Christian Lins
chris@3:  * @since sonews/1.0
chris@3:  */
cli@42: public final class StorageManager {
chris@3: 
cli@37: 	private static StorageProvider provider;
chris@3: 
cli@45: 	public static Storage current() throws StorageBackendException {
cli@37: 		synchronized (StorageManager.class) {
cli@37: 			if (provider == null) {
cli@37: 				return null;
cli@37: 			} else {
cli@37: 				return provider.storage(Thread.currentThread());
cli@37: 			}
cli@37: 		}
cli@37: 	}
chris@3: 
cli@42: 	public static StorageProvider loadProvider(String pluginClassName) {
cli@37: 		try {
cli@37: 			Class<?> clazz = Class.forName(pluginClassName);
cli@37: 			Object inst = clazz.newInstance();
cli@45: 			return (StorageProvider)inst;
cli@37: 		} catch (Exception ex) {
cli@37: 			System.err.println(ex);
cli@37: 			return null;
cli@37: 		}
cli@37: 	}
chris@3: 
cli@37: 	/**
cli@37: 	 * Sets the current storage provider.
cli@37: 	 * @param provider
cli@37: 	 */
cli@42: 	public static void enableProvider(StorageProvider provider) {
cli@37: 		synchronized (StorageManager.class) {
cli@37: 			if (StorageManager.provider != null) {
cli@37: 				disableProvider();
cli@37: 			}
cli@37: 			StorageManager.provider = provider;
cli@37: 		}
cli@37: 	}
chris@3: 
cli@37: 	/**
cli@37: 	 * Disables the current provider.
cli@37: 	 */
cli@42: 	public static void disableProvider() {
cli@37: 		synchronized (StorageManager.class) {
cli@37: 			provider = null;
cli@37: 		}
cli@37: 	}
chris@3: }