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: 
chris@3: package org.sonews.storage;
chris@3: 
chris@3: /**
chris@3:  *
chris@3:  * @author Christian Lins
chris@3:  * @since sonews/1.0
chris@3:  */
chris@3: public final class StorageManager
chris@3: {
chris@3: 
chris@3:   private static StorageProvider provider;
chris@3: 
chris@3:   public static Storage current()
chris@3:     throws StorageBackendException
chris@3:   {
chris@3:     synchronized(StorageManager.class)
chris@3:     {
chris@3:       if(provider == null)
chris@3:       {
chris@3:         return null;
chris@3:       }
chris@3:       else
chris@3:       {
chris@3:         return provider.storage(Thread.currentThread());
chris@3:       }
chris@3:     }
chris@3:   }
chris@3: 
chris@3:   public static StorageProvider loadProvider(String pluginClassName)
chris@3:   {
chris@3:     try
chris@3:     {
chris@3:       Class<?> clazz = Class.forName(pluginClassName);
chris@3:       Object   inst  = clazz.newInstance();
chris@3:       return (StorageProvider)inst;
chris@3:     }
chris@3:     catch(Exception ex)
chris@3:     {
chris@3:       System.err.println(ex);
chris@3:       return null;
chris@3:     }
chris@3:   }
chris@3: 
chris@3:   /**
chris@3:    * Sets the current storage provider.
chris@3:    * @param provider
chris@3:    */
chris@3:   public static void enableProvider(StorageProvider provider)
chris@3:   {
chris@3:     synchronized(StorageManager.class)
chris@3:     {
chris@3:       if(StorageManager.provider != null)
chris@3:       {
chris@3:         disableProvider();
chris@3:       }
chris@3:       StorageManager.provider = provider;
chris@3:     }
chris@3:   }
chris@3: 
chris@3:   /**
chris@3:    * Disables the current provider.
chris@3:    */
chris@3:   public static void disableProvider()
chris@3:   {
chris@3:     synchronized(StorageManager.class)
chris@3:     {
chris@3:       provider = null;
chris@3:     }
chris@3:   }
chris@3: 
chris@3: }