chris@0: /*
chris@0:  *   StarOffice News Server
chris@0:  *   see AUTHORS for the list of contributors
chris@0:  *
chris@0:  *   This program is free software: you can redistribute it and/or modify
chris@0:  *   it under the terms of the GNU General Public License as published by
chris@0:  *   the Free Software Foundation, either version 3 of the License, or
chris@0:  *   (at your option) any later version.
chris@0:  *
chris@0:  *   This program is distributed in the hope that it will be useful,
chris@0:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@0:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@0:  *   GNU General Public License for more details.
chris@0:  *
chris@0:  *   You should have received a copy of the GNU General Public License
chris@0:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@0:  */
chris@0: 
chris@0: package com.so.news.storage;
chris@0: 
chris@0: import java.util.Date;
chris@0: 
chris@0: import com.so.news.Config;
chris@0: import com.so.news.Debug;
chris@0: 
chris@0: /**
chris@0:  * The purger is started in configurable intervals to search
chris@0:  * for old messages that can be purged.
chris@0:  * @author Christian Lins
chris@0:  */
chris@0: public class Purger extends Thread
chris@0: {
chris@0:   private int interval;
chris@0:   
chris@0:   public Purger()
chris@0:   {
chris@0:     setDaemon(true); // Daemons run only along with the main thread
chris@0:     setPriority(Thread.MIN_PRIORITY);
chris@0: 
chris@0:     this.interval = Config.getInstance().get("n3tpd.article.lifetime", 30) * 24 * 60 * 60 * 1000; // Milliseconds
chris@0:     if(this.interval < 0)
chris@0:       this.interval = Integer.MAX_VALUE;
chris@0:   }
chris@0:   
chris@0:   /**
chris@0:    * Runloop of this Purger class.
chris@0:    */
chris@0:   @Override
chris@0:   public void run()
chris@0:   {
chris@0:     for(;;)
chris@0:     {
chris@0:       purge();
chris@0: 
chris@0:       try
chris@0:       {
chris@0:         sleep(interval);
chris@0:       }
chris@0:       catch(InterruptedException e)
chris@0:       {
chris@0:         e.printStackTrace(Debug.getInstance().getStream());
chris@0:       }
chris@0:     }
chris@0:   }
chris@0: 
chris@0:   /**
chris@0:    * Loops through all messages and deletes them if their time
chris@0:    * has come.
chris@0:    */
chris@0:   private void purge()
chris@0:   {
chris@0:     Debug.getInstance().log("Purging old messages...");
chris@0: 
chris@0:     try
chris@0:     {
chris@0:       for(;;)
chris@0:       {
chris@0:         Article art = null; //Database.getInstance().getOldestArticle();
chris@0:         if(art == null) // No articles in the database
chris@0:           break;
chris@0:         
chris@0:         if(art.getDate().getTime() < (new Date().getTime() + this.interval))
chris@0:         {
chris@0:           Database.getInstance().delete(art);
chris@0:           Debug.getInstance().log("Deleted: " + art);
chris@0:         }
chris@0:         else
chris@0:           break;
chris@0:       }
chris@0:     }
chris@0:     catch(Exception ex)
chris@0:     {
chris@0:       ex.printStackTrace();
chris@0:     }
chris@0:   }
chris@0: }