src/org/sonews/util/Purger.java
author cli
Mon Aug 30 00:20:06 2010 +0200 (2010-08-30)
changeset 39 73b21e9f3958
parent 36 c404a87db5b7
child 48 b78e77619152
permissions -rw-r--r--
Some work on XDAEMON command.
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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.util;
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import java.util.Date;
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import java.util.List;
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import org.sonews.daemon.AbstractDaemon;
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import org.sonews.config.Config;
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import org.sonews.storage.Article;
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import org.sonews.storage.Headers;
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import org.sonews.storage.Channel;
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import org.sonews.storage.Group;
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import org.sonews.storage.StorageBackendException;
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import org.sonews.storage.StorageManager;
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/**
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 * The purger is started in configurable intervals to search
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 * for messages that can be purged. A message must be deleted if its lifetime
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 * has exceeded, if it was marked as deleted or if the maximum number of
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 * articles in the database is reached.
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 * @author Christian Lins
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 * @since sonews/0.5.0
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 */
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public class Purger extends AbstractDaemon
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{
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	/**
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	 * Loops through all messages and deletes them if their time
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	 * has come.
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	 */
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	@Override
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	public void run()
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	{
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		try {
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			while (isRunning()) {
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				purgeDeleted();
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				purgeOutdated();
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				Thread.sleep(120000); // Sleep for two minutes
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			}
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		} catch (StorageBackendException ex) {
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			ex.printStackTrace();
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		} catch (InterruptedException ex) {
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			Log.get().warning("Purger interrupted: " + ex);
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		}
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	}
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	private void purgeDeleted()
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		throws StorageBackendException
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	{
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		List<Channel> groups = StorageManager.current().getGroups();
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		for (Channel channel : groups) {
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			if (!(channel instanceof Group)) {
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				continue;
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			}
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			Group group = (Group) channel;
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			// Look for groups that are marked as deleted
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			if (group.isDeleted()) {
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				List<Long> ids = StorageManager.current().getArticleNumbers(group.getInternalID());
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				if (ids.size() == 0) {
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					StorageManager.current().purgeGroup(group);
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					Log.get().info("Group " + group.getName() + " purged.");
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				}
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				for (int n = 0; n < ids.size() && n < 10; n++) {
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					Article art = StorageManager.current().getArticle(ids.get(n), group.getInternalID());
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					StorageManager.current().delete(art.getMessageID());
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					Log.get().info("Article " + art.getMessageID() + " purged.");
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				}
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			}
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		}
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	}
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	private void purgeOutdated()
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		throws InterruptedException, StorageBackendException
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	{
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		long articleMaximum =
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			Config.inst().get("sonews.article.maxnum", Long.MAX_VALUE);
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		long lifetime =
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			Config.inst().get("sonews.article.lifetime", -1);
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		if (lifetime > 0 || articleMaximum < Stats.getInstance().getNumberOfNews()) {
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			Log.get().info("Purging old messages...");
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			String mid = StorageManager.current().getOldestArticle();
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			if (mid == null) // No articles in the database
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			{
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				return;
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			}
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			Article art = StorageManager.current().getArticle(mid);
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			long artDate = 0;
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			String dateStr = art.getHeader(Headers.DATE)[0];
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			try {
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				artDate = Date.parse(dateStr) / 1000 / 60 / 60 / 24;
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			} catch (IllegalArgumentException ex) {
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				Log.get().warning("Could not parse date string: " + dateStr + " " + ex);
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			}
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			// Should we delete the message because of its age or because the
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			// article maximum was reached?
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			if (lifetime < 0 || artDate < (new Date().getTime() + lifetime)) {
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				StorageManager.current().delete(mid);
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				System.out.println("Deleted: " + mid);
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			} else {
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				Thread.sleep(1000 * 60); // Wait 60 seconds
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				return;
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			}
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		} else {
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			Log.get().info("Lifetime purger is disabled");
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			Thread.sleep(1000 * 60 * 30); // Wait 30 minutes
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		}
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	}
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}