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/*
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* SONEWS News Server
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* see AUTHORS for the list of contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.sonews.config;
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import java.util.logging.Level;
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import org.sonews.util.Log;
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import org.sonews.storage.StorageBackendException;
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import org.sonews.storage.StorageManager;
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import org.sonews.util.TimeoutMap;
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/**
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* Provides access to the program wide configuration that is stored within
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* the server's database.
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* @author Christian Lins
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* @since sonews/0.5.0
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*/
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class BackendConfig extends AbstractConfig
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{
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private static BackendConfig instance = new BackendConfig();
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public static BackendConfig getInstance()
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{
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return instance;
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}
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private final TimeoutMap<String, String> values = new TimeoutMap<String, String>();
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private BackendConfig()
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{
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super();
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}
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/**
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* Returns the config value for the given key or the defaultValue if the
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* key is not found in config.
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* @param key
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* @param defaultValue
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* @return
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*/
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@Override
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public String get(String key, String defaultValue)
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{
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try {
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String configValue = values.get(key);
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if (configValue == null) {
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if (StorageManager.current() == null) {
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Log.get().warning("BackendConfig not available, using default.");
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return defaultValue;
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}
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configValue = StorageManager.current().getConfigValue(key);
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if (configValue == null) {
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return defaultValue;
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} else {
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values.put(key, configValue);
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return configValue;
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}
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} else {
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return configValue;
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}
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} catch (StorageBackendException ex) {
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Log.get().log(Level.SEVERE, "Storage backend problem", ex);
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return defaultValue;
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}
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}
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/**
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* Sets the config value which is identified by the given key.
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* @param key
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* @param value
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*/
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public void set(String key, String value)
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{
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values.put(key, value);
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try {
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// Write values to database
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StorageManager.current().setConfigValue(key, value);
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} catch (StorageBackendException ex) {
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ex.printStackTrace();
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}
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}
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}
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