Mercurial > hg > orthanc
comparison Core/MultiThreading/SharedMessageQueue.cpp @ 450:58b433bb9762
SharedMessageQueue
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 04 Jul 2013 09:34:09 +0200 |
parents | |
children | 80f7539147a2 |
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449:694f06a84bf4 | 450:58b433bb9762 |
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1 /** | |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege, | |
4 * Belgium | |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
10 * | |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
22 * | |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #include "SharedMessageQueue.h" | |
34 | |
35 namespace Orthanc | |
36 { | |
37 SharedMessageQueue::SharedMessageQueue(unsigned int maxSize) | |
38 { | |
39 maxSize_ = maxSize; | |
40 } | |
41 | |
42 | |
43 SharedMessageQueue::~SharedMessageQueue() | |
44 { | |
45 for (Queue::iterator it = queue_.begin(); it != queue_.end(); it++) | |
46 { | |
47 delete *it; | |
48 } | |
49 } | |
50 | |
51 | |
52 void SharedMessageQueue::Enqueue(IDynamicObject* message) | |
53 { | |
54 boost::mutex::scoped_lock lock(mutex_); | |
55 | |
56 if (maxSize_ != 0 && queue_.size() > maxSize_) | |
57 { | |
58 // Too many elements in the queue: First remove the oldest | |
59 delete queue_.front(); | |
60 queue_.pop_front(); | |
61 } | |
62 | |
63 queue_.push_back(message); | |
64 elementAvailable_.notify_one(); | |
65 } | |
66 | |
67 | |
68 IDynamicObject* SharedMessageQueue::Dequeue(int32_t millisecondsTimeout) | |
69 { | |
70 boost::mutex::scoped_lock lock(mutex_); | |
71 | |
72 // Wait for a message to arrive in the FIFO queue | |
73 while (queue_.empty()) | |
74 { | |
75 if (millisecondsTimeout == 0) | |
76 { | |
77 elementAvailable_.wait(lock); | |
78 } | |
79 else | |
80 { | |
81 bool success = elementAvailable_.timed_wait | |
82 (lock, boost::posix_time::milliseconds(millisecondsTimeout)); | |
83 if (!success) | |
84 { | |
85 return NULL; | |
86 } | |
87 } | |
88 } | |
89 | |
90 std::auto_ptr<IDynamicObject> message(queue_.front()); | |
91 queue_.pop_front(); | |
92 | |
93 return message.release(); | |
94 } | |
95 } |