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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #pragma once
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34
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35 #include "../IDynamicObject.h"
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36
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37 #include <stdint.h>
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38 #include <list>
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39 #include <boost/thread.hpp>
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40
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41 namespace Orthanc
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42 {
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43 class SharedMessageQueue : public boost::noncopyable
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44 {
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45 private:
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46 typedef std::list<IDynamicObject*> Queue;
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47
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48 bool isFifo_;
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49 unsigned int maxSize_;
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50 Queue queue_;
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51 boost::mutex mutex_;
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52 boost::condition_variable elementAvailable_;
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53 boost::condition_variable emptied_;
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54
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55 public:
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56 explicit SharedMessageQueue(unsigned int maxSize = 0);
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57
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58 ~SharedMessageQueue();
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59
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60 // This transfers the ownership of the message
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61 void Enqueue(IDynamicObject* message);
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62
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63 // The caller is responsible to delete the dequeud message!
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64 IDynamicObject* Dequeue(int32_t millisecondsTimeout);
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65
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66 bool WaitEmpty(int32_t millisecondsTimeout);
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67
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68 bool IsFifoPolicy() const
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69 {
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70 return isFifo_;
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71 }
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72
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73 bool IsLifoPolicy() const
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74 {
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75 return !isFifo_;
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76 }
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77
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78 void SetFifoPolicy();
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79
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80 void SetLifoPolicy();
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81 };
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82 }
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