org/sonews/config/BackendConfig.java
author cli
Sat, 01 May 2010 14:27:30 +0200
changeset 28 15d14b110240
parent 15 f2293e8566f5
permissions -rw-r--r--
Make mailinglist gateway more reliable, probably.
     1 /*
     2  *   SONEWS News Server
     3  *   see AUTHORS for the list of contributors
     4  *
     5  *   This program is free software: you can redistribute it and/or modify
     6  *   it under the terms of the GNU General Public License as published by
     7  *   the Free Software Foundation, either version 3 of the License, or
     8  *   (at your option) any later version.
     9  *
    10  *   This program is distributed in the hope that it will be useful,
    11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
    12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13  *   GNU General Public License for more details.
    14  *
    15  *   You should have received a copy of the GNU General Public License
    16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17  */
    18 
    19 package org.sonews.config;
    20 
    21 import java.util.logging.Level;
    22 import org.sonews.util.Log;
    23 import org.sonews.storage.StorageBackendException;
    24 import org.sonews.storage.StorageManager;
    25 import org.sonews.util.TimeoutMap;
    26 
    27 /**
    28  * Provides access to the program wide configuration that is stored within
    29  * the server's database.
    30  * @author Christian Lins
    31  * @since sonews/0.5.0
    32  */
    33 class BackendConfig extends AbstractConfig
    34 {
    35 
    36   private static BackendConfig instance = new BackendConfig();
    37   
    38   public static BackendConfig getInstance()
    39   {
    40     return instance;
    41   }
    42   
    43   private final TimeoutMap<String, String> values 
    44     = new TimeoutMap<String, String>();
    45   
    46   private BackendConfig()
    47   {
    48     super();
    49   }
    50   
    51   /**
    52    * Returns the config value for the given key or the defaultValue if the
    53    * key is not found in config.
    54    * @param key
    55    * @param defaultValue
    56    * @return
    57    */
    58   @Override
    59   public String get(String key, String defaultValue)
    60   {
    61     try
    62     {
    63       String configValue = values.get(key);
    64       if(configValue == null)
    65       {
    66         if(StorageManager.current() == null)
    67         {
    68           Log.get().warning("BackendConfig not available, using default.");
    69           return defaultValue;
    70         }
    71 
    72         configValue = StorageManager.current().getConfigValue(key);
    73         if(configValue == null)
    74         {
    75           return defaultValue;
    76         }
    77         else
    78         {
    79           values.put(key, configValue);
    80           return configValue;
    81         }
    82       }
    83       else
    84       {
    85         return configValue;
    86       }
    87     }
    88     catch(StorageBackendException ex)
    89     {
    90       Log.get().log(Level.SEVERE, "Storage backend problem", ex);
    91       return defaultValue;
    92     }
    93   }
    94   
    95   /**
    96    * Sets the config value which is identified by the given key.
    97    * @param key
    98    * @param value
    99    */
   100   public void set(String key, String value)
   101   {
   102     values.put(key, value);
   103     
   104     try
   105     {
   106       // Write values to database
   107       StorageManager.current().setConfigValue(key, value);
   108     }
   109     catch(StorageBackendException ex)
   110     {
   111       ex.printStackTrace();
   112     }
   113   }
   114   
   115 }