1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
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 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. transmission time", "ms");
initLong("t_max", 500, "Min. transmission time", "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 time: " + serverTime + "; (t_min,t_max): (" + tMin +
"," + tMax + "); Old time: " + process.getTime() +
"; New time: " + 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();
}
}
|
