/**
* Vosao CMS. Simple CMS for Google App Engine.
*
* Copyright (C) 2009-2010 Vosao development team.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* email: vosao.dev@gmail.com
*/
package org.vosao.business.impl.mq.subscriber;
import org.vosao.business.impl.mq.AbstractSubscriber;
import org.vosao.business.mq.Message;
import org.vosao.business.mq.Topic;
import org.vosao.business.mq.message.SimpleMessage;
import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.PreparedQuery;
import com.google.appengine.api.datastore.Query;
import com.google.appengine.api.datastore.Query.FilterOperator;
/**
*
* @author Alexander Oleynik
*
*/
public class SessionCleanTaskSubscriber extends AbstractSubscriber {
public void onMessage(Message message) {
SimpleMessage msg = (SimpleMessage) message;
String mode = msg.getMessage();
if (mode != null && mode.equals("start")) {
addSessionCleanTask();
}
else {
DatastoreService datastore = getBusiness().getSystemService()
.getDatastore();
Query query = new Query("_ah_SESSION");
query.addFilter("_expires", FilterOperator.LESS_THAN,
System.currentTimeMillis());
PreparedQuery results = datastore.prepare(query);
int i = 0;
boolean end = true;
for (Entity session : results.asIterable()) {
datastore.delete(session.getKey());
i++;
if (getBusiness().getSystemService()
.getRequestCPUTimeSeconds() > 25) {
addSessionCleanTask();
end = false;
break;
}
}
logger.info("Deleted " + i + " sessions.");
if (end) {
logger.info("Finished session cleaning.");
}
}
}
private void addSessionCleanTask() {
getMessageQueue().publish(new SimpleMessage(Topic.SESSION_CLEAN.name(),
null));
logger.info("Added new session clean task");
}
}