chris@1: /*
chris@1:  *   SONEWS News Server
chris@1:  *   see AUTHORS for the list of contributors
chris@1:  *
chris@1:  *   This program is free software: you can redistribute it and/or modify
chris@1:  *   it under the terms of the GNU General Public License as published by
chris@1:  *   the Free Software Foundation, either version 3 of the License, or
chris@1:  *   (at your option) any later version.
chris@1:  *
chris@1:  *   This program is distributed in the hope that it will be useful,
chris@1:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@1:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@1:  *   GNU General Public License for more details.
chris@1:  *
chris@1:  *   You should have received a copy of the GNU General Public License
chris@1:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@1:  */
chris@1: package org.sonews.util;
chris@1: 
cli@36: import java.util.Date;
cli@36: import java.util.List;
chris@3: import org.sonews.daemon.AbstractDaemon;
chris@3: import org.sonews.config.Config;
chris@3: import org.sonews.storage.Article;
chris@3: import org.sonews.storage.Headers;
chris@3: import org.sonews.storage.Group;
chris@3: import org.sonews.storage.StorageBackendException;
chris@3: import org.sonews.storage.StorageManager;
chris@1: 
chris@1: /**
chris@1:  * The purger is started in configurable intervals to search
chris@3:  * for messages that can be purged. A message must be deleted if its lifetime
chris@3:  * has exceeded, if it was marked as deleted or if the maximum number of
chris@3:  * articles in the database is reached.
chris@1:  * @author Christian Lins
chris@1:  * @since sonews/0.5.0
chris@1:  */
cli@48: public class Purger extends AbstractDaemon {
chris@1: 
cli@37: 	/**
cli@37: 	 * Loops through all messages and deletes them if their time
cli@37: 	 * has come.
cli@37: 	 */
cli@37: 	@Override
cli@48: 	public void run() {
cli@37: 		try {
cli@37: 			while (isRunning()) {
cli@37: 				purgeDeleted();
cli@37: 				purgeOutdated();
chris@1: 
cli@37: 				Thread.sleep(120000); // Sleep for two minutes
cli@37: 			}
cli@37: 		} catch (StorageBackendException ex) {
cli@37: 			ex.printStackTrace();
cli@37: 		} catch (InterruptedException ex) {
cli@37: 			Log.get().warning("Purger interrupted: " + ex);
cli@37: 		}
cli@37: 	}
chris@3: 
cli@37: 	private void purgeDeleted()
cli@48: 			throws StorageBackendException {
cli@48: 		List<Group> groups = StorageManager.current().getGroups();
cli@48: 		for (Group channel : groups) {
cli@37: 			if (!(channel instanceof Group)) {
cli@37: 				continue;
cli@37: 			}
chris@3: 
cli@37: 			Group group = (Group) channel;
cli@37: 			// Look for groups that are marked as deleted
cli@37: 			if (group.isDeleted()) {
cli@37: 				List<Long> ids = StorageManager.current().getArticleNumbers(group.getInternalID());
cli@37: 				if (ids.size() == 0) {
cli@37: 					StorageManager.current().purgeGroup(group);
cli@37: 					Log.get().info("Group " + group.getName() + " purged.");
cli@37: 				}
chris@3: 
cli@37: 				for (int n = 0; n < ids.size() && n < 10; n++) {
cli@37: 					Article art = StorageManager.current().getArticle(ids.get(n), group.getInternalID());
cli@37: 					StorageManager.current().delete(art.getMessageID());
cli@37: 					Log.get().info("Article " + art.getMessageID() + " purged.");
cli@37: 				}
cli@37: 			}
cli@37: 		}
cli@37: 	}
chris@3: 
cli@37: 	private void purgeOutdated()
cli@48: 			throws InterruptedException, StorageBackendException {
cli@37: 		long articleMaximum =
cli@48: 				Config.inst().get("sonews.article.maxnum", Long.MAX_VALUE);
cli@37: 		long lifetime =
cli@48: 				Config.inst().get("sonews.article.lifetime", -1);
chris@1: 
cli@37: 		if (lifetime > 0 || articleMaximum < Stats.getInstance().getNumberOfNews()) {
cli@37: 			Log.get().info("Purging old messages...");
cli@37: 			String mid = StorageManager.current().getOldestArticle();
cli@37: 			if (mid == null) // No articles in the database
cli@37: 			{
cli@37: 				return;
cli@37: 			}
chris@3: 
cli@37: 			Article art = StorageManager.current().getArticle(mid);
cli@37: 			long artDate = 0;
cli@37: 			String dateStr = art.getHeader(Headers.DATE)[0];
cli@37: 			try {
cli@37: 				artDate = Date.parse(dateStr) / 1000 / 60 / 60 / 24;
cli@37: 			} catch (IllegalArgumentException ex) {
cli@37: 				Log.get().warning("Could not parse date string: " + dateStr + " " + ex);
cli@37: 			}
chris@1: 
cli@37: 			// Should we delete the message because of its age or because the
cli@37: 			// article maximum was reached?
cli@37: 			if (lifetime < 0 || artDate < (new Date().getTime() + lifetime)) {
cli@37: 				StorageManager.current().delete(mid);
cli@37: 				System.out.println("Deleted: " + mid);
cli@37: 			} else {
cli@37: 				Thread.sleep(1000 * 60); // Wait 60 seconds
cli@37: 				return;
cli@37: 			}
cli@37: 		} else {
cli@37: 			Log.get().info("Lifetime purger is disabled");
cli@37: 			Thread.sleep(1000 * 60 * 30); // Wait 30 minutes
cli@37: 		}
cli@37: 	}
chris@1: }