/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* 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.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.gwt.client;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.RepeatingCommand;
import com.google.gwt.user.client.rpc.AsyncCallback;
/**
* A timer which sends an RPC call regularly to keep the session alive.<p>
*
* @since 8.0.0
*/
public class CmsPingTimer {
/**
* The static instance.<p>
*/
private static CmsPingTimer INSTANCE;
/**
* The interval for the RPC calls.<p>
*/
public static final int PING_INTERVAL = 1000 * 60 * 5;
/**
* Starts the timer.<p>
*/
public static void start() {
if (INSTANCE == null) {
INSTANCE = new CmsPingTimer();
INSTANCE.run();
}
}
/**
* Installs the timer which fires the RPC calls.<p>
*/
protected void run() {
Scheduler.get().scheduleFixedDelay(new RepeatingCommand() {
public boolean execute() {
CmsCoreProvider.getService().ping(new AsyncCallback<Void>() {
public void onFailure(Throwable caught) {
// do nothing
}
public void onSuccess(Void result) {
//do nothing
}
});
return true;
}
}, PING_INTERVAL);
}
}