org/sonews/storage/StorageManager.java
author chris <chris@marvin>
Tue, 28 Jul 2009 15:39:37 +0200
changeset 4 cdddff328b78
parent 3 2fdc9cc89502
permissions -rw-r--r--
Update doc.
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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.storage;
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/**
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 *
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 * @author Christian Lins
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 * @since sonews/1.0
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 */
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public final class StorageManager
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{
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  private static StorageProvider provider;
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  public static Storage current()
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    throws StorageBackendException
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  {
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    synchronized(StorageManager.class)
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    {
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      if(provider == null)
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      {
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        return null;
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      }
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      else
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      {
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        return provider.storage(Thread.currentThread());
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      }
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    }
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  }
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  public static StorageProvider loadProvider(String pluginClassName)
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  {
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    try
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    {
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      Class<?> clazz = Class.forName(pluginClassName);
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      Object   inst  = clazz.newInstance();
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      return (StorageProvider)inst;
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    }
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    catch(Exception ex)
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    {
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      System.err.println(ex);
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      return null;
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    }
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  }
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  /**
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   * Sets the current storage provider.
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   * @param provider
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   */
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  public static void enableProvider(StorageProvider provider)
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  {
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    synchronized(StorageManager.class)
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    {
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      if(StorageManager.provider != null)
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      {
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        disableProvider();
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      }
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      StorageManager.provider = provider;
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    }
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  }
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  /**
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   * Disables the current provider.
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   */
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  public static void disableProvider()
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  {
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    synchronized(StorageManager.class)
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    {
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      provider = null;
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    }
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  }
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}