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/*
* VS is (c) 2008 by Paul C. Buetow
* vs@dev.buetow.org
*/
package protocols.implementations;
import core.VSMessage;
import protocols.VSProtocol;
// TODO: Auto-generated Javadoc
/**
* The Class ExternalTimeSyncProtocol.
*/
public class ExternalTimeSyncProtocol extends VSProtocol {
private static final long serialVersionUID = 1L;
/** The request time. */
private long requestTime;
/** The waiting for response. */
private boolean waitingForResponse;
/**
* Instantiates a new external time sync protocol.
*/
public ExternalTimeSyncProtocol() {
setClassname(getClass().toString());
}
/* (non-Javadoc)
* @see events.VSEvent#onInit()
*/
protected void onInit() {
}
/* (non-Javadoc)
* @see protocols.VSProtocol#onClientReset()
*/
protected void onClientReset() {
}
/* (non-Javadoc)
* @see protocols.VSProtocol#onClientStart()
*/
protected void onClientStart() {
requestTime = process.getTime();
waitingForResponse = true;
/* Multicast message to all processes */
VSMessage message = new VSMessage(getClassname());
message.setBoolean("isClientRequest", true);
sendMessage(message);
}
/* (non-Javadoc)
* @see protocols.VSProtocol#onClientRecv(core.VSMessage)
*/
protected void onClientRecv(VSMessage recvMessage) {
if (!recvMessage.getBoolean("isServerResponse"))
return;
if (waitingForResponse)
waitingForResponse = false;
else
return;
long recvTime = process.getTime();
long roundTripTime = recvTime - requestTime;
long serverTime = recvMessage.getLong("time");
long newTime = serverTime + (long) (roundTripTime / 2);
logg("Server Zeit: " + serverTime + "; RTT: " + roundTripTime + "; Alte Zeit: " + recvTime + "; Neue Zeit: " + newTime + "; Offset: " + (newTime - recvTime));
process.setTime(newTime);
}
/* (non-Javadoc)
* @see protocols.VSProtocol#onServerReset()
*/
protected void onServerReset() {
}
/* (non-Javadoc)
* @see protocols.VSProtocol#onServerRecv(core.VSMessage)
*/
protected void onServerRecv(VSMessage recvMessage) {
if (!recvMessage.getBoolean("isClientRequest"))
return;
/* Multicast message to all processes */
VSMessage message = new VSMessage(getClassname());
message.setLong("time", process.getTime());
message.setBoolean("isServerResponse", true);
sendMessage(message);
}
/* (non-Javadoc)
* @see protocols.VSProtocol#toString()
*/
public String toString() {
return super.toString(); //+ "; " + prefs.getString("lang.requesttime") + ": " + requestTime;
}
}
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