/*
* Copyright (c) 2012 Alexander Diener,
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
package de.fhkn.in.uce.mediator.connectionhandling;
import java.net.Socket;
import de.fhkn.in.uce.mediator.peerregistry.UserList;
import de.fhkn.in.uce.mediator.util.MediatorUtil;
import de.fhkn.in.uce.plugininterface.mediator.HandleMessage;
import de.fhkn.in.uce.plugininterface.message.NATTraversalTechniqueAttribute;
import de.fhkn.in.uce.stun.attribute.Username;
import de.fhkn.in.uce.stun.message.Message;
/**
* Handles keep alive messages and refreshes the time stamp of the user. After
* handling the message no response will be sent.
*
* @author Alexander Diener (aldiener@htwg-konstanz.de)
*
*/
public final class DefaultKeepAliveHandling implements HandleMessage {
private final UserList userList;
private final MediatorUtil mediatorUtil;
public DefaultKeepAliveHandling() {
this.userList = UserList.INSTANCE;
this.mediatorUtil = MediatorUtil.INSTANCE;
}
@Override
public void handleMessage(final Message keepaliveMessage, final Socket controlConnection) throws Exception {
this.mediatorUtil.checkForAttribute(keepaliveMessage, Username.class);
final Username username = keepaliveMessage.getAttribute(Username.class);
this.userList.refreshUserTimestamp(username.getUsernameAsString());
this.sendSuccessResponse(keepaliveMessage, controlConnection);
}
private void sendSuccessResponse(final Message toRespond, final Socket controlConnection) throws Exception {
final Message response = toRespond.buildSuccessResponse();
response.writeTo(controlConnection.getOutputStream());
}
@Override
public NATTraversalTechniqueAttribute getAttributeForTraversalTechnique() {
return new NATTraversalTechniqueAttribute(Integer.MAX_VALUE);
}
}