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.config;
chris@3: 
cli@15: import java.util.logging.Level;
chris@3: import org.sonews.util.Log;
chris@3: import org.sonews.storage.StorageBackendException;
chris@3: import org.sonews.storage.StorageManager;
chris@3: import org.sonews.util.TimeoutMap;
chris@3: 
chris@3: /**
chris@3:  * Provides access to the program wide configuration that is stored within
chris@3:  * the server's database.
chris@3:  * @author Christian Lins
chris@3:  * @since sonews/0.5.0
chris@3:  */
cli@49: class BackendConfig extends AbstractConfig {
chris@3: 
cli@37: 	private static BackendConfig instance = new BackendConfig();
cli@12: 
cli@49: 	public static BackendConfig getInstance() {
cli@37: 		return instance;
cli@37: 	}
cli@37: 	private final TimeoutMap<String, String> values = new TimeoutMap<String, String>();
cli@37: 
cli@49: 	private BackendConfig() {
cli@37: 		super();
cli@37: 	}
cli@37: 
cli@37: 	/**
cli@37: 	 * Returns the config value for the given key or the defaultValue if the
cli@37: 	 * key is not found in config.
cli@37: 	 * @param key
cli@37: 	 * @param defaultValue
cli@37: 	 * @return
cli@37: 	 */
cli@37: 	@Override
cli@49: 	public String get(String key, String defaultValue) {
cli@37: 		try {
cli@37: 			String configValue = values.get(key);
cli@37: 			if (configValue == null) {
cli@37: 				if (StorageManager.current() == null) {
cli@37: 					Log.get().warning("BackendConfig not available, using default.");
cli@37: 					return defaultValue;
cli@37: 				}
cli@37: 
cli@37: 				configValue = StorageManager.current().getConfigValue(key);
cli@37: 				if (configValue == null) {
cli@37: 					return defaultValue;
cli@37: 				} else {
cli@37: 					values.put(key, configValue);
cli@37: 					return configValue;
cli@37: 				}
cli@37: 			} else {
cli@37: 				return configValue;
cli@37: 			}
cli@37: 		} catch (StorageBackendException ex) {
cli@37: 			Log.get().log(Level.SEVERE, "Storage backend problem", ex);
cli@37: 			return defaultValue;
cli@37: 		}
cli@37: 	}
cli@37: 
cli@37: 	/**
cli@37: 	 * Sets the config value which is identified by the given key.
cli@37: 	 * @param key
cli@37: 	 * @param value
cli@37: 	 */
cli@49: 	public void set(String key, String value) {
cli@37: 		values.put(key, value);
cli@37: 
cli@37: 		try {
cli@37: 			// Write values to database
cli@37: 			StorageManager.current().setConfigValue(key, value);
cli@37: 		} catch (StorageBackendException ex) {
cli@37: 			ex.printStackTrace();
cli@37: 		}
cli@37: 	}
chris@3: }