1 | /** this class is fully thread-safe */ |
2 | class Flag { |
3 | private boolean up; |
4 | |
5 | /** returns true if flag was down before */ |
6 | public synchronized boolean raise() { |
7 | return doRaise(); |
8 | } |
9 | |
10 | private synchronized boolean doRaise() { |
11 | if (!up) { |
12 | up = true; |
13 | notifyAll(); |
14 | return true; |
15 | } else |
16 | return false; |
17 | } |
18 | |
19 | public synchronized void waitUntilUp() { |
20 | if (!up) { |
21 | try { |
22 | wait(); |
23 | } catch (InterruptedException e) { |
24 | e.printStackTrace(); |
25 | } |
26 | } |
27 | } |
28 | |
29 | public synchronized boolean isUp() { |
30 | return up; |
31 | } |
32 | |
33 | public String toString() { |
34 | return isUp() ? "up" : "down"; |
35 | } |
36 | |
37 | // currently does a semi-active wait with latency = 50 ms |
38 | public void waitForThisOr(Flag otherFlag) ctex { |
39 | while (!isUp() && !otherFlag.isUp()) |
40 | Thread.sleep(50); |
41 | } |
42 | } |
Began life as a copy of #1000781
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Snippet ID: | #1000782 |
Snippet name: | Simple "Flag" class (thread-safe flagging!) |
Eternal ID of this version: | #1000782/1 |
Text MD5: | d4ed5418a5fde2cc3629ea0cddca98f7 |
Author: | stefan |
Category: | |
Type: | JavaX fragment (include) |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | Yes |
Created/modified: | 2015-08-27 02:00:08 |
Source code size: | 862 bytes / 42 lines |
Pitched / IR pitched: | No / Yes |
Views / Downloads: | 448 / 619 |
Referenced in: | [show references] |