org/sonews/config/BackendConfig.java
author cli
Sun, 29 Aug 2010 17:04:25 +0200
changeset 34 9f0b95aafaa3
parent 15 f2293e8566f5
permissions -rw-r--r--
Merge heads.
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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 
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    = 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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    {
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      String configValue = values.get(key);
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      if(configValue == null)
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      {
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        if(StorageManager.current() == null)
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        {
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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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        {
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          return defaultValue;
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        }
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        else
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        {
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          values.put(key, configValue);
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          return configValue;
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        }
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      }
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      else
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      {
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        return configValue;
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      }
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    }
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    catch(StorageBackendException ex)
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    {
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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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    {
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      // Write values to database
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      StorageManager.current().setConfigValue(key, value);
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    }
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    catch(StorageBackendException ex)
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    {
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      ex.printStackTrace();
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    }
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  }
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}