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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 part of core; | |
6 | |
7 class Timeout implements Comparable<Timeout> { | |
8 int deadline; // milliseconds since the Unix epoch. | |
9 SendPort port; | |
10 | |
11 Timeout(this.port, this.deadline); | |
12 | |
13 int compareTo(Timeout other) => other.deadline - deadline; | |
14 } | |
15 | |
16 class TimerQueue { | |
17 SplayTreeSet _set; | |
18 Timeout _nextTimer; | |
19 | |
20 TimerQueue() : _set = new SplayTreeSet(); | |
21 | |
22 void updateTimer(SendPort port, int deadline) { | |
23 var removedTimeout = null; | |
24 _set.removeWhere((timeout) { | |
25 if (timeout.port == port) { | |
26 removedTimeout = timeout; | |
27 return true; | |
28 } | |
29 return false; | |
30 }); | |
31 | |
32 if ((removedTimeout == null) && (deadline >= 0)) { | |
33 _set.add(new Timeout(port, deadline)); | |
34 } else { | |
35 if (deadline > 0) { | |
36 removedTimeout.deadline = deadline; | |
37 _set.add(removedTimeout); | |
38 } | |
39 } | |
40 | |
41 if (_set.isNotEmpty) { | |
42 _nextTimer = _set.first; | |
43 } else { | |
44 _nextTimer = null; | |
45 } | |
46 } | |
47 | |
48 void removeCurrent() => updateTimer(currentPort, -1); | |
49 | |
50 bool get hasTimer => _nextTimer != null; | |
51 int get currentTimeout => _nextTimer.deadline; | |
52 SendPort get currentPort => _nextTimer.port; | |
53 } | |
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