blob: c097a0d700efdff963b8a171077ed7b313a5db37 (
plain)
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
|
package com.orbekk.same;
import java.util.List;
import java.util.LinkedList;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The implementation of a 'Same' state.
*
* This class manages the current state of the Same protocol.
*/
public class SameState extends Thread implements UrlReceiver {
private Logger logger = LoggerFactory.getLogger(getClass());
private ConnectionManager connections;
private List<String> participants = new LinkedList<String>();
private String currentState = "";
private String networkName;
/**
* The client id of this participant.
*/
private String clientId;
/**
* The URL of this participant.
*
* Important note: Our URL is unknown initially. Url is null until we
* receive our first request. The URL is then taken to be the target URL
* from the request.
*/
private String url = null;
/**
* Stopping condition for this thread.
*/
private boolean stopped = false;
/**
* Queue for pending participants.
*/
private List<String> pendingParticipants = new LinkedList<String>();
public SameState(String networkName, String clientId,
ConnectionManager connections) {
this.networkName = networkName;
this.clientId = clientId;
this.connections = connections;
}
public synchronized List<String> getParticipants() {
return participants;
}
public String getClientId() {
return clientId;
}
public String getNetworkName() {
return networkName;
}
public String getCurrentState() {
return currentState;
}
public String getUrl() {
return url;
}
@Override
public void setUrl(String url) {
logger.info("My URL is {}", url);
this.url = url;
}
public synchronized void addParticipant(String clientId, String url) {
logger.info("PendingParticipant.add: {} ({})", clientId, url);
pendingParticipants.add(url);
notifyAll();
}
private synchronized void handleNewParticipants() {
// Adding all pending participants ensures that each of the new
// participants is informed of all participants.
//
// TODO: Does not inform old participants.
participants.addAll(pendingParticipants);
for (String url : pendingParticipants) {
logger.info("New participant: {}", url);
SameService remoteService = connections.getConnection(url);
remoteService.notifyParticipation(networkName, participants);
}
pendingParticipants.clear();
}
public synchronized void run() {
while (!stopped) {
handleNewParticipants();
try {
wait(1000);
} catch (InterruptedException e) {
// Ignore interrupt in wait loop.
}
}
}
public synchronized void stopSame() {
try {
stopped = true;
notifyAll();
this.join();
} catch (InterruptedException e) {
logger.warn("Got InterruptedException while waiting for SameState " +
"to finish. Ignoring.");
}
}
}
|