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/*
* Copyright (c) 2008 Paul C. Buetow, vs@dev.buetow.org
*
* 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 2
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* All icons of the icons/ folder are under a Creative Commons
* Attribution-Noncommercial-Share Alike License a CC-by-nc-sa.
*
* The icon's homepage is http://code.google.com/p/ultimate-gnome/
*/
package protocols.implementations;
import core.VSMessage;
import protocols.VSAbstractProtocol;
/**
* The class VSInternalTimeSyncProtocol, an implementation of the internal
* time synchronisation protocol.
*
* @author Paul C. Buetow
*/
public class VSInternalTimeSyncProtocol extends VSAbstractProtocol {
/** The serial version uid */
private static final long serialVersionUID = 1L;
/** The waiting for response. */
private boolean waitingForResponse;
/**
* Instantiates a new internal time sync protocol.
*/
public VSInternalTimeSyncProtocol() {
super(VSAbstractProtocol.HAS_ON_CLIENT_START);
setClassname(getClass().toString());
}
/* (non-Javadoc)
* @see events.VSAbstractProtocol#onClientInit()
*/
public void onClientInit() {
initLong("t_min", 2000, "Max. Übetragungszeit", "ms");
initLong("t_max", 500, "Min. Übertragungszeit", "ms");
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientReset()
*/
public void onClientReset() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientStart()
*/
public void onClientStart() {
waitingForResponse = true;
/* Multicast message to all processes */
VSMessage message = new VSMessage();
message.setBoolean("isClientRequest", true);
sendMessage(message);
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientRecv(core.VSMessage)
*/
public void onClientRecv(VSMessage recvMessage) {
/* Ignore all protocol messages which are not a response message,
e.g. itself */
if (!recvMessage.getBoolean("isServerResponse"))
return;
if (waitingForResponse)
waitingForResponse = false;
else
return;
long tMax = getLong("t_max");
long tMin = getLong("t_min");
long serverTime = recvMessage.getLong("time");
long newTime = serverTime + (long) ((tMax + tMin) / 2 );
log("Server Zeit: " + serverTime + "; (t_min,t_max): (" + tMin +
"," + tMax + "); Alte Zeit: " + process.getTime() +
"; Neue Zeit: " + newTime + "; Offset: " +
(process.getTime() - newTime));
process.setTime(newTime);
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onClientSchedule()
*/
public void onClientSchedule() {
}
/* (non-Javadoc)
* @see events.VSAbstractProtocol#onServerInit()
*/
public void onServerInit() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerReset()
*/
public void onServerReset() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerRecv(core.VSMessage)
*/
public void onServerRecv(VSMessage recvMessage) {
/* Ignore all protocol messages which are not a request message,
e.g. itself */
if (!recvMessage.getBoolean("isClientRequest"))
return;
/* Multicast message to all processes */
VSMessage message = new VSMessage();
message.setLong("time", process.getTime());
message.setBoolean("isServerResponse", true);
sendMessage(message);
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#onServerSchedule()
*/
public void onServerSchedule() {
}
/* (non-Javadoc)
* @see protocols.VSAbstractProtocol#toString()
*/
public String toString() {
return super.toString();
}
}
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