src/org/sonews/util/Purger.java
author cli
Sun, 11 Sep 2011 14:19:19 +0200
changeset 47 e118b4d60029
parent 37 74139325d305
child 48 b78e77619152
permissions -rwxr-xr-x
Complete XDAEMON GROUPFLAG subcommand.
     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.util;
    20 
    21 import java.util.Date;
    22 import java.util.List;
    23 import org.sonews.daemon.AbstractDaemon;
    24 import org.sonews.config.Config;
    25 import org.sonews.storage.Article;
    26 import org.sonews.storage.Headers;
    27 import org.sonews.storage.Channel;
    28 import org.sonews.storage.Group;
    29 import org.sonews.storage.StorageBackendException;
    30 import org.sonews.storage.StorageManager;
    31 
    32 /**
    33  * The purger is started in configurable intervals to search
    34  * for messages that can be purged. A message must be deleted if its lifetime
    35  * has exceeded, if it was marked as deleted or if the maximum number of
    36  * articles in the database is reached.
    37  * @author Christian Lins
    38  * @since sonews/0.5.0
    39  */
    40 public class Purger extends AbstractDaemon
    41 {
    42 
    43 	/**
    44 	 * Loops through all messages and deletes them if their time
    45 	 * has come.
    46 	 */
    47 	@Override
    48 	public void run()
    49 	{
    50 		try {
    51 			while (isRunning()) {
    52 				purgeDeleted();
    53 				purgeOutdated();
    54 
    55 				Thread.sleep(120000); // Sleep for two minutes
    56 			}
    57 		} catch (StorageBackendException ex) {
    58 			ex.printStackTrace();
    59 		} catch (InterruptedException ex) {
    60 			Log.get().warning("Purger interrupted: " + ex);
    61 		}
    62 	}
    63 
    64 	private void purgeDeleted()
    65 		throws StorageBackendException
    66 	{
    67 		List<Channel> groups = StorageManager.current().getGroups();
    68 		for (Channel channel : groups) {
    69 			if (!(channel instanceof Group)) {
    70 				continue;
    71 			}
    72 
    73 			Group group = (Group) channel;
    74 			// Look for groups that are marked as deleted
    75 			if (group.isDeleted()) {
    76 				List<Long> ids = StorageManager.current().getArticleNumbers(group.getInternalID());
    77 				if (ids.size() == 0) {
    78 					StorageManager.current().purgeGroup(group);
    79 					Log.get().info("Group " + group.getName() + " purged.");
    80 				}
    81 
    82 				for (int n = 0; n < ids.size() && n < 10; n++) {
    83 					Article art = StorageManager.current().getArticle(ids.get(n), group.getInternalID());
    84 					StorageManager.current().delete(art.getMessageID());
    85 					Log.get().info("Article " + art.getMessageID() + " purged.");
    86 				}
    87 			}
    88 		}
    89 	}
    90 
    91 	private void purgeOutdated()
    92 		throws InterruptedException, StorageBackendException
    93 	{
    94 		long articleMaximum =
    95 			Config.inst().get("sonews.article.maxnum", Long.MAX_VALUE);
    96 		long lifetime =
    97 			Config.inst().get("sonews.article.lifetime", -1);
    98 
    99 		if (lifetime > 0 || articleMaximum < Stats.getInstance().getNumberOfNews()) {
   100 			Log.get().info("Purging old messages...");
   101 			String mid = StorageManager.current().getOldestArticle();
   102 			if (mid == null) // No articles in the database
   103 			{
   104 				return;
   105 			}
   106 
   107 			Article art = StorageManager.current().getArticle(mid);
   108 			long artDate = 0;
   109 			String dateStr = art.getHeader(Headers.DATE)[0];
   110 			try {
   111 				artDate = Date.parse(dateStr) / 1000 / 60 / 60 / 24;
   112 			} catch (IllegalArgumentException ex) {
   113 				Log.get().warning("Could not parse date string: " + dateStr + " " + ex);
   114 			}
   115 
   116 			// Should we delete the message because of its age or because the
   117 			// article maximum was reached?
   118 			if (lifetime < 0 || artDate < (new Date().getTime() + lifetime)) {
   119 				StorageManager.current().delete(mid);
   120 				System.out.println("Deleted: " + mid);
   121 			} else {
   122 				Thread.sleep(1000 * 60); // Wait 60 seconds
   123 				return;
   124 			}
   125 		} else {
   126 			Log.get().info("Lifetime purger is disabled");
   127 			Thread.sleep(1000 * 60 * 30); // Wait 30 minutes
   128 		}
   129 	}
   130 }