1 | sclass ConnectedInstances {
|
2 | ExpiringMap2<S, Bool> recentlyConnected_internal = new ExpiringMap2(5000/*, r updateValue*/); |
3 | new MultiSet<S> activeConnections; |
4 | Map<S, Bool> recentlyConnected = synchroMap(recentlyConnected_internal); |
5 | Set<S> set; |
6 | SimpleLiveValue<Int> connected2 = new(Int, 0); // filtered count |
7 | |
8 | void setAfterglowInterval(int ms) {
|
9 | recentlyConnected_internal.setStandardExpiryTime(ms); |
10 | } |
11 | |
12 | void start() {
|
13 | // TODO (maybe): add countdown to ExpiringMap instead |
14 | doEvery(1000, r {
|
15 | bool changes; |
16 | synchronized(recentlyConnected) {
|
17 | changes = recentlyConnected_internal.clean(); |
18 | } |
19 | if (changes) updateValue(); |
20 | }); |
21 | } |
22 | |
23 | void updateValue {
|
24 | Set<S> set1 = keys(activeConnections); |
25 | Set<S> set2 = keys(recentlyConnected); |
26 | set = mergeSets(set1, set2); |
27 | int n = l(set); |
28 | connected2.set(n); |
29 | print("Updated value to " + n + " (" + l(set1) + "/" + l(set2) + ")");
|
30 | } |
31 | |
32 | void gotConnection(S computerID) {
|
33 | if (computerID != null) {
|
34 | activeConnections.add(computerID); |
35 | print("Have active connections from " + computerID + ": " + activeConnections.get(computerID));
|
36 | updateValue(); |
37 | } |
38 | } |
39 | |
40 | void lostConnection(S computerID) {
|
41 | if (computerID != null) {
|
42 | activeConnections.remove(computerID); |
43 | print("Disconnected. Have active connections from " + computerID + ": " + activeConnections.get(computerID));
|
44 | recentlyConnected.put(computerID, true); |
45 | updateValue(); |
46 | } |
47 | } |
48 | |
49 | Set<S> set() { ret set; }
|
50 | int value() { ret connected2!; }
|
51 | |
52 | /*void waitForChange(int value, int timeout) {
|
53 | waitForVarToChange_withTimeout(connected2, value, timeout); |
54 | }*/ |
55 | } |
Began life as a copy of #1016548
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| Snippet ID: | #1016567 |
| Snippet name: | ConnectedInstances - robustly counts computers currently connected through network |
| Eternal ID of this version: | #1016567/16 |
| Text MD5: | d7519002b51ae5ca457a77955aba83f5 |
| Author: | stefan |
| Category: | javax / web |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2018-08-04 13:55:31 |
| Source code size: | 1743 bytes / 55 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 408 / 984 |
| Version history: | 15 change(s) |
| Referenced in: | [show references] |